Protracted Township Grid for Alaska (NAD27)

Metadata also available as - [Questions & Answers] - [Parseable text] - [XML] - [DIF]

Metadata:


Identification_Information:
Citation:
Citation_Information:
Originator:
U.S. Dept. of Interior, Bureau of Land Management, Division of Support Services, Branch of Information Resource Management
Publication_Date: 20080204
Title: Protracted Township Grid for Alaska (NAD27)
Geospatial_Data_Presentation_Form: vector digital data
Description:
Abstract:
Township boundaries were generated from geodetic latitude and longitude coordinate pairs as recorded on BLM's official protraction diagrams of the state of Alaska.
The Informix Township table is a spatially-enabled table that contains all of the protraction information for each of the 18,654 townships. Township shapes are stored as NAD27 geographic multipolygons. Each township was individually constructed from NAD27 geographic pro_pt (Protracted Point) table and is fully densified by including all township/section offset corners from adjacent township/sections. The geometry for a single township may include as many as 44 coordinates on the exterior ring.
The township table identifies 18,654 townships as 18,654 multi-polygons (four townships require two polygons each), as depicted on the official BLM protraction diagrams.
MTR Number of Geometries ----------------------------------------------------------- C034S048E 2 C040S073E 2 C066S098E 2 C034S067E 2
Purpose:
For GIS mapping and analytical use. The spatially-enabled township table precisely maps the township coordinates as defined on the official BLM protraction diagrams. Not for use in determining area computations. Please consult official BLM protraction diagrams for the record protracted area.
Supplemental_Information:
The values used for this data were initially obtained from U.S., Department of the Interior, Bureau of Land Management, Alaska State Office, Division of Cadastral Survey and Geomatics's (BLM) AEH (acronym unknown) coordinate files.
These files represented townships in two ways as follows:
1. Regular Townships were represented as a geodetic rectangle bounded by two latitudes and two longitudes.
2. Irregular Townships were represented as a sequential series of geodetic coordinate pairs.
Additionally these files represented township subdivision by recording the origin point for township's subdivision as a code for one of the four township's corners and a series of codes indicating which rows and columns of sections were intended to be created. Collectively these codes are referred to as "shape codes."
In 1996 BLM obtained an updated version of the AEH files from the State of Alaska, Department of Natural Resources (ADNR.)
A comparison was performed between the most current set of BLM's files and ADNR's files. Lists of differences were compiled and resolved as follows:
1. Additional Townships
The additional townships shown in ADNR's files were discarded as they represent marine townships and their creation and maintenance is not the responsibility of the BLM.
One additional township shown in BLM's files was discarded as it represented land shown in another township that was properly represented.
2. Subdivision Shape Code Differences
Referring to the official protraction diagrams the proper shape codes were utilized.
Subdivision shape codes are implied on the official protraction diagrams as the township's graphic representation through the use of parenthetical distances.
3. OrthogonalTownship Boundary Position Differences Shown On Official Protraction Diagrams
Referring to the official protraction diagrams the proper positions were utilized.
Orthogonal township boundaries are shown on the official protraction diagrams as lines of true-mean-bearing along meridians of longitude and parallels of latitude. Reported on these diagrams are geodetic coordinates for the latitude and longitude for these lines. These coordinates are reported on the North American Datum 1927 (NAD27.)
4. Orthogonal Township Boundary Position Differences Not Shown On Official Protraction Diagrams
Referring to the official protraction diagrams the proper positions were calculated and utilized.
These positions were rounded to the nearest 1/1000 of a second for compatibility with adjacent townships.
5. L-shaped Irregular Townships
These townships are "puzzle pieces" used along the intersection of meridians or for certain correctional meridians and/or parallels shown on the official protraction diagrams.
No differences were noted between the two sets of files.
6. Alaskan-Canadian Irregular Townships
Referring to the official protraction diagrams it was noted that neither BLM's or ADNR's files appeared to properly represent these townships. Therefore it was necessary to recompile these townships.
Initially the townships represented in this manner were restricted to a portion along the international boundary in the southeastern panhandle of the State, specifically from the head of Tongass Passage to Mount St. Elias.
Referring to the U.S., Department of State, International Boundary Commission (IBC) publication "JOINT REPORT UPON THE SURVEY AND DEMARCATION OF THE BOUNDARY BETWEEN CANADA AND THE UNITED STATES FROM TONGASS PASSAGE TO MOUNT ST. ELIAS, 1952" (IBC 1952) it was decided to represent those townships from the mouth of Tongass Passage to it's head as irregular townships.
Further it was noted that Boundary Point 187 at the northern end of this portion of the international boundary recorded in the IBC 1952 publication was not on the 141st meridian. Referring to the IBC publication "JOINT REPORT UPON THE SURVEY AND DEMARCATION OF THE INTERNATIONAL BOUNDARY BETWEEN THE UNITED STATES AND CANADA ALONG THE 141ST MERIDIAN FROM THE ARCTIC OCEAN TO MOUNT ST. ELIAS, 1918" (IBC 1918) it was noted that the 141st meridian portion of the international boundary was recorded on the Yukon Datum at 141 degrees West longitude.
Therefore it became necessary to additionally represent all of the townships along the 141st meridian as irregular townships.
For the "southeastern" portion of the Alaskan-Canadian boundary (not including Boundary Point 187) the coordinate values used are reported in the IBC 1952 publication. These coordinates are reported on the North American Datum 1927 (NAD27.)
For the "141st Meridian" portion of the Alaskan-Canadian boundary (including Boundary Point 187) the coordinate values reported in IBC 1918 publication are on the Yukon Datum. In order to get proper coordinates BLM contacted the IBC and a list of coordinates was obtained. These coordinates were reported on the National Geodetic Reference Datum of 1983 (NAD83.) These coordinates were further processed using the U.S., Department of Commerce, National Oceanic and Atmospheric Administration, National Geodetic Survey (NGS) computer program NADCON version 2.1 to obtain NAD27 coordinates.
Intersections of the orthogonal township boundaries (true-mean-bearing) and the Alaskan-Canadian boundary (line-of-sight) were then computed and irregular townships were then constructed from the results.
This process showed that one township adjacent to Tongass Passage, that had been represented as an orthogonal township falls completely in Canada. That township was discarded.
Upon completion of this process GIS techniques were used to confirm that proper topology existed in this data.
This process showed that in three localities a small parcel of land was shown in two townships. Referring to the official protraction diagrams it was decided to amend three of these diagrams and to construct three additional irregular townships.
Additional analysis with BLM's Alaska Land Information System (ALIS) showed that a township had been surveyed that was not represented in this data. That township was added to this data as an orthogonal township.
Township and Section Protraction Re-engineering: A. Added Section Table
B. Add shapes to township and section tables: 1. Spatially-enable township, section, and pro_pt tables to include shape and objectid fields. a. Township shape field ST_Multipolygon b. Section shape field ST_Multipolgon c. Pro_pt shape field ST_Point d. Objectid set to not null, number (38)
C. Add formatted MTR to township and section tables.
C. Add land desc label field to township and section tables.
D. Altered base protraction tables to: 1. Add fields to record the twp and sec pt labels, relative to the twp/sec being defined. Such as: NW, SW, SE, NE, IP, etc. 2. Add field to pro_pt to distinguish protraction points from construction points. 3. Associated the construction points to the appropriate twp/secs based on data in source data file.
E. Updated the township features from ST_Multipolygon shapes consisting of only points at the township corners to ST_Multipolygon shapes also containing points of intersect where section lines meet the township boundary. 1. Densified the township shape features with section corners that fall along the twp lines.
F. Determined all possible section corners for each township using explicit database relationships.
G. Ran program that used Informix Spatial DataBlade and Java 2D framework to densify the boundary by determining the distance between each section corner and all township's boundaries; inserted any points within an extremely small tolerance (0.0000001 degrees) into the township ST_Multipolygon feature. About 1/50,000 were false positives, causing self-intersection errors and manually corrected.
H. Manually edited the only four townships having more than one polygon making up it's shape.
I. Spatially verified topology by comparing shapes of sections dissolved to the township to shapes of the township.
SELECT * FROM township WHERE NOT ST_Equals(shape, (select SE_Dissolve(shape) from section where section.twp_tin_no = township.twp_tin_no) )
Time_Period_of_Content:
Time_Period_Information:
Single_Date/Time:
Calendar_Date: 20080204
Currentness_Reference: publication date
Status:
Progress: Complete
Maintenance_and_Update_Frequency: As needed
Spatial_Domain:
Bounding_Coordinates:
West_Bounding_Coordinate: -179.227825
East_Bounding_Coordinate: 179.896724
North_Bounding_Coordinate: 71.468681
South_Bounding_Coordinate: 51.202992
Keywords:
Theme:
Theme_Keyword_Thesaurus: BLM-THEME
Theme_Keyword: Framework
Place:
Place_Keyword_Thesaurus: BLM-STATE
Place_Keyword: Alaska
Access_Constraints:
Discretionary, contains no sensitive information - generally considered releaseable.
Use_Constraints:
Accuracy published on or derived from the official BLM township protraction diagrams. Any hardcopies or published datasets using this data shall clearly indicate their source.
Any users wishing to modify this data are obligated to report the extent of their modifications. User specifically agrees not to misrepresent modifications to this data, as approved or endorsed by the BLM.
Any discrepancies or errors in this data should be reported to BLM.
Point_of_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Dennis Walworth
Contact_Organization:
Division of Support Services, Branch of IRM, Data Management Section
Contact_Position: Data Administrator
Contact_Address:
Address_Type: mailing and physical address
Address: 222 W. 7th Ave. #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: (907) 271-3237
Contact_Facsimile_Telephone: (907) 271-4549
Contact_Electronic_Mail_Address: dwalwort@blm.gov
Hours_of_Service: 0800-1630
Data_Set_Credit:
BLM Official Protraction Diagrams; International Boundary Commission for Alaska/Canadian Boundary; ADNR for ongoing coordination
Native_Data_Set_Environment:
Microsoft Windows XP Version 5.1 (Build 2600) Service Pack 2; ESRI ArcCatalog 9.2.2.1350

Data_Quality_Information:
Attribute_Accuracy:
Attribute_Accuracy_Report:
Attributes assigned to the spatially-enabled township table are defined in the BLM-Alaska State data dictionary for townships. Attributes for townships are defined from the BLM official protraction diagrams.
Logical_Consistency_Report:
Spatially verified topology by comparing shapes of sections dissolved to the township to shape of the township.
SELECT * FROM township WHERE NOT ST_Equals(shape, (select SE_Dissolve(shape) from section where section.twp_tin_no = township.twp_tin_no) )
Completeness_Report:
There is a one-to-one relationship between each township in the spatial database and on the offical protraction diagrams
Positional_Accuracy:
Horizontal_Positional_Accuracy:
Horizontal_Positional_Accuracy_Report:
Section geometries were spatially dissolved and compared to township geometries. No differences in shape geometries were found.
The accuracy of the coordinates in this data is absolute due to their theoretical nature, however the source data shows values to the nearest fraction of a second of latitude or longitude as follows:
1. Township Corners:
0.001" as shown on or calculated from official protraction diagrams, except Umiat Meridian latitudes where they are 0.01".
2. Section Corners:
0.00001" as calculated to preserve angularity and distance.
3. Points along Alaskan-Canadian Boundaries:
3a. For points between Tongass Passage and Mt. St. Elias (not including Boundary Point 187), 0.01" as shown in U.S. Department of State, International Boundary Commission (IBC) publication "JOINT REPORT UPON THE SURVEY AND DEMARCATION OF THE BOUNDARY BETWEEN CANADA AND THE UNITED STATES FROM TONGASS PASSAGE TO MOUNT ST. ELIAS, 1952."
3b. For points between Mt. St. Elias and the Arctic Ocean (including Boundary Point 187), 0.00001" to preserve backwards compatibility with National Geodetic Reference Datum of 1983 using U.S., Department of Commerce, National Geodetic Survey (NGS) computer program NADCON version 2.1.
3c. For intersection points of orthogonal township boundaries with the Alaskan-Canadian boundaries, 0.00001" as calculated to preserve angularity and distance.
Vertical_Positional_Accuracy:
Vertical_Positional_Accuracy_Report: unknown
Lineage:
Process_Step:
Process_Description: See Abstract and Supplemental Information for process steps.
Process_Date: 20010214
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tom Wohlwend
Contact_Organization:
Bureau of Land Management, Alaska State Office, Division of Cadastral Survey and Geomatics, Branch of Spatial Records
Contact_Position: Geodesist
Contact_Address:
Address_Type: mailing and physical address
Address: 222 W. 7th Ave, #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: (907) 271-4224
Contact_Facsimile_Telephone: (907) 271-4549
Contact_Electronic_Mail_Address: Tom_Wohlwend@ak.blm.gov
Hours_of_Service: 0800-1630
Process_Step:
Process_Description:
Populated Township shape from selection set of protraction points for a given township. Most township shapes were correctly populate without additional intervention. Multipolygon townships and townships along the Canadian International boundary required additional automated and some manual intervention to fully incorporate all township/section offsets.
Process_Date: 20061101
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Dennis Walworth
Contact_Organization:
Division of Support Services, Branch of IRM, Data Management Section
Contact_Position: IT Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 222 W. 7th Ave. #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: 907-271-3237
Contact_Facsimile_Telephone: 907-271-4549
Contact_Electronic_Mail_Address: Dennis_Walworth@ak.blm.gov
Hours_of_Service: 0800-1630
Process_Step:
Process_Description:
Township and Section Protraction Re-engineering: A. Added Section Table
B. Add shapes to township and section tables: 1. Spatially-enable township, section, and pro_pt tables to include shape and objectid fields. a. Township shape field ST_Multipolygon b. Section shape field ST_Multipolgon c. Pro_pt shape field ST_Point d. Objectid set to not null, number (38)
C. Add formatted MTR to township and section tables.
C. Add land desc label field to township and section tables.
D. Altered base protraction tables to: 1. Add fields to record the twp and sec pt labels, relative to the twp/sec being defined. Such as: NW, SW, SE, NE, IP, etc. 2. Add field to pro_pt to distinguish protraction points from construction points. 3. Associated the construction points to the appropriate twp/secs based on data in source data file.
E. Updated the township features from ST_Multipolygon shapes consisting of only points at the township corners to ST_Multipolygon shapes also containing points of intersect where section lines meet the township boundary. 1. Densified the township shape features with section corners that fall along the twp lines.
F. Determined all possible section corners for each township using explicit database relationships.
G. Ran program that used Informix Spatial DataBlade and Java 2D framework to densify the boundary by determining the distance between each section corner and all township's boundaries; inserted any points within an extremely small tolerance (0.0000001 degrees) into the township ST_Multipolygon feature. About 1/50,000 were false positives, causing self-intersection errors and manually corrected.
H. Manually edited the only four townships having more than one polygon making up it's shape.
I. Spatially verified topology by comparing shapes of sections dissolved to the township to shapes of the township.
SELECT * FROM township WHERE NOT ST_Equals(shape, (select SE_Dissolve(shape) from section where section.twp_tin_no = township.twp_tin_no) )
Process_Date: 20061101
Process_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Jarad Bond
Contact_Organization:
Division of Support Services, Branch of IRM, Data Management Section
Contact_Position: IT Specialist
Contact_Address:
Address_Type: mailing and physical address
Address: 222 W 7th Ave #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: (907) 271-3255
Contact_Facsimile_Telephone: (907) 271-4549
Contact_Electronic_Mail_Address: Jarad_Bond@ak.blm.gov
Cloud_Cover: 0

Spatial_Data_Organization_Information:
Direct_Spatial_Reference_Method: Vector
Point_and_Vector_Object_Information:
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: G-polygon
Point_and_Vector_Object_Count: 18654
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Label point
Point_and_Vector_Object_Count: 18658
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: GT-polygon composed of chains
Point_and_Vector_Object_Count: 18685
SDTS_Terms_Description:
SDTS_Point_and_Vector_Object_Type: Point
Point_and_Vector_Object_Count: 4

Spatial_Reference_Information:
Horizontal_Coordinate_System_Definition:
Geographic:
Latitude_Resolution: 0.000000000001
Longitude_Resolution: 0.000000000001
Geographic_Coordinate_Units: Decimal degrees
Geodetic_Model:
Horizontal_Datum_Name: North American Datum of 1927
Ellipsoid_Name: Clarke 1866
Semi-major_Axis: 6378206.400000
Denominator_of_Flattening_Ratio: 294.978698

Entity_and_Attribute_Information:
Detailed_Description:
Entity_Type:
Entity_Type_Label: township27
Entity_Type_Definition:
PLSS Townships defined by BLM-Alaska Official Protraction Diagrams
Entity_Type_Definition_Source: BLM-Alaska Official Protraction Diagrams
Attribute:
Attribute_Label: twp_tin_no
Attribute_Definition:
Township TIN Number is an indexing system in Alaska for townships. Each township in the state has a unique 5 digit index number.
Attribute_Definition_Source: Bureau of Land Management
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 1
Range_Domain_Maximum: 21,200
Attribute_Units_of_Measure: 1
Attribute:
Attribute_Label: twp_dir_cd
Attribute_Definition:
Township Direction indicates the direction the tier is relative to the Baseline.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: N
Enumerated_Domain_Value_Definition: North
Enumerated_Domain_Value_Definition_Source: PLSS
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: South
Enumerated_Domain_Value_Definition_Source: PLSS
Attribute:
Attribute_Label: objectid
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: FID
Attribute_Definition: Internal feature number.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain:
Sequential unique whole numbers that are automatically generated.
Attribute:
Attribute_Label: Shape
Attribute_Definition: Feature geometry.
Attribute_Definition_Source: ESRI
Attribute_Domain_Values:
Unrepresentable_Domain: Coordinates defining the features.
Attribute:
Attribute_Label: mer_cd
Attribute_Definition: Meridian Code identifies a Principal Meridian in Alaska.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: S
Enumerated_Domain_Value_Definition: Seward Meridian
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: C
Enumerated_Domain_Value_Definition: Copper River Meridian
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: F
Enumerated_Domain_Value_Definition: Fairbanks meridian
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: U
Enumerated_Domain_Value_Definition: Umiat Meridian
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: K
Enumerated_Domain_Value_Definition: Kateel River
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute:
Attribute_Label: pd_typ_cd
Attribute_Definition:
Protraction Diagram Type Code indicates the type of protraction, such as original, amended, or revised.
Attribute_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: O
Enumerated_Domain_Value_Definition: Original
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: A
Enumerated_Domain_Value_Definition: Amended
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: R
Enumerated_Domain_Value_Definition: Revised
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute:
Attribute_Label: tier_no
Attribute_Definition:
Township Tier Number identifies the location, North or South, of a township from the Baseline.
Attribute_Definition_Source: Bureau of Land Management
Attribute_Domain_Values:
Unrepresentable_Domain: Varies by meridian.
Attribute:
Attribute_Label: frac_cd
Attribute_Definition:
Township Fraction indicates a type of township that is fractional in Tier dimensions due to the fit of the PLSS grid. 1/2 townships are fractional townships by definition.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: 0 indicates this is not a fractional township
Enumerated_Domain_Value_Definition_Source: BLM Official Protraction Diagrams
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: 2 indicates this is a fractional township
Enumerated_Domain_Value_Definition_Source: BLM Official Protraction Diagrams
Attribute:
Attribute_Label: range_no
Attribute_Definition:
Range Number identifies the location of a township east or west from the Principal Meridian.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Unrepresentable_Domain: Varies by meridian.
Attribute:
Attribute_Label: rng_dir_cd
Attribute_Definition:
Range Direction indicates the direction, East or West from the Principal Meridian.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: E
Enumerated_Domain_Value_Definition: East from the Principal Meridian
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: W
Enumerated_Domain_Value_Definition: West from the Principal Meridian.
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute:
Attribute_Label: rng_frc_cd
Attribute_Definition:
Range Fraction is a type of township that is fractional in Range dimensions due to the fit of the PLSS grid. 1/2 Ranges are fractional ranges by definition.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 0
Enumerated_Domain_Value_Definition: 0 indicates this is a fractional range
Enumerated_Domain_Value_Definition_Source: BLM Official Protraction Diagrams
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition: 2 indicates this is a fractional range
Enumerated_Domain_Value_Definition_Source: BLM Official Protraction Diagrams
Attribute:
Attribute_Label: mtr_txt
Attribute_Definition:
This is a "zero filled" format description of a township. MTR contains a formatted, concatenated grouping of meridian code, township, township direction, township fraction (if fractional), range, range direction, range fraction (if fractional).
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Unrepresentable_Domain: Varies by Township: C017S011E, C017[.5]S011[.5]E
Attribute:
Attribute_Label: desc_txt
Attribute_Definition:
This is a label field for a township constructed by concatenating tier, range and meridian into a narrative description.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Unrepresentable_Domain: The format is: Txxx{N/S}{2}, Rxxx{E/W}{2}, {C/S/F/K/U}M
Attribute:
Attribute_Label: org_pt_cd
Attribute_Definition:
Protraction Origin Point identifies which corner serves as the basis for protracting the PLSS grid for that township. For instance, a SouthEast Origin Point generally means sections for that township were measured off at 80 chain intervals from the South East corner, leaving the remainder distance to the last row and column of the section grid.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NE
Enumerated_Domain_Value_Definition: NorthEast Origin Point
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: NW
Enumerated_Domain_Value_Definition: NorthWest Origin Point
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SE
Enumerated_Domain_Value_Definition: SouthEast Origin Point
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: SW
Enumerated_Domain_Value_Definition: SouthWest Origin Point
Enumerated_Domain_Value_Definition_Source: Bureau of Land Management/GLO
Attribute:
Attribute_Label: nlimit_sec
Attribute_Definition:
Section North Limit is used to indicate the northern row limit of section lines based on the protraction of the township from the point of origin.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
northern row limit of 2 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition:
northern row limit of 3 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
northern row limit of 4 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
northern row limit of 5 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
northern row limit of 6 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition:
northern row limit of 7 section lines based on the protraction of the township from the point of origin
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute:
Attribute_Label: slimit_sec
Attribute_Definition:
Section South Limit is the is used to indicate the sourthern row limit of section lines based on the protraction of the township from the point of origin.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:
southern row limit of 1 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
southern row limit of 2 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
southern row limit of 6 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute:
Attribute_Label: elimit_sec
Attribute_Definition:
Section East Limit is used to indicate the eastern column limit of section lines based on the protraction of the township from the point of origin.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 1
Enumerated_Domain_Value_Definition:
eastern column limit of 1 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
eastern column limit of 2 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition:
eastern column limit of 3 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
eastern column limit of 4 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
eastern column limit of 5 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
eastern column limit of 6 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute:
Attribute_Label: wlimit_sec
Attribute_Definition:
Section West Limit is used to indicate the western column limit of section lines based on the protraction of the township from the point of origin.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 2
Enumerated_Domain_Value_Definition:
western column limit of 2 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 3
Enumerated_Domain_Value_Definition:
western column limit of 3 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 4
Enumerated_Domain_Value_Definition:
western column limit of 4 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 5
Enumerated_Domain_Value_Definition:
western column limit of 5 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 6
Enumerated_Domain_Value_Definition:
western column limit of 6 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute_Domain_Values:
Enumerated_Domain:
Enumerated_Domain_Value: 7
Enumerated_Domain_Value_Definition:
western column limit of 7 section lines based on the protraction of the township from the point of origin.
Enumerated_Domain_Value_Definition_Source: BLM Alaska SDMS Data Dictionary
Attribute:
Attribute_Label: folio_no
Attribute_Definition:
Protraction Diagram Folio Number is a grouping of protraction diagram sheets. It forms part of the identification of a protraction diagram: Meridian, Folio, Sheet. (F 1-9).
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Range_Domain:
Range_Domain_Minimum: 01
Range_Domain_Maximum: 37
Attribute_Units_of_Measure: 1
Attribute:
Attribute_Label: sheet_no
Attribute_Definition:
Protraction Diagram Sheet Number is a specific protraction diagram sheet. It forms part of the identification of a protraction diagram: Meridian, Folio, Sheet (F 1-9). A protraction sheet is usually identified by a two-digit number. A suffix character may exist (13A).
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Unrepresentable_Domain:
Protraction Diagram Sheet Number is a specific protraction diagram sheet. 001 through 028, & 13A
Attribute:
Attribute_Label: pub_date
Attribute_Definition:
Protraction Diagram Published Date is the date a protraction diagram was approved.
Attribute_Definition_Source: Bureau of Land Management/GLO
Attribute_Domain_Values:
Unrepresentable_Domain: Protraction Diagram Publication Date not populated in database.
Overview_Description:
Entity_and_Attribute_Overview:
Statewide protracted township grid based on BLM's official protraction diagrams.
Entity_and_Attribute_Detail_Citation:
Attributes are abstracted from BLM's official protraction diagrams.

Distribution_Information:
Distributor:
Contact_Information:
Contact_Person_Primary:
Contact_Person: John Montgomery
Contact_Organization: Bureau of Land Management, Alaska State Office
Contact_Position: State Records Administrator
Contact_Address:
Address_Type: mailing and physical address
Address: 222 W. 7th Ave #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: (907) 271-5054
Contact_Electronic_Mail_Address: John_Montgomery@ak.blm.gov
Hours_of_Service: 0800-1630
Resource_Description: Available internally to BLM only.
Distribution_Liability:
No warrany is made by the Bureau of Land Management as to the accuracy, reliability, or completeness of these data for individual use or aggregate use with other data.
Standard_Order_Process:
Digital_Form:
Digital_Transfer_Information:
Format_Name: ARCE
Format_Version_Number: 7.2.1
Format_Specification: Arc/Info Interchange File
File_Decompression_Technique: Gzip -D
Transfer_Size: 3.89
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://agdc.usgs.gov/data/blm/sdms/>
Access_Instructions: Internet
Digital_Form:
Digital_Transfer_Information:
Format_Name: SHAPE
Format_Version_Number: 2
Format_Specification: ESRI Shape File
File_Decompression_Technique: Gzip -D
Transfer_Size: 2.54
Digital_Transfer_Option:
Online_Option:
Computer_Contact_Information:
Network_Address:
Network_Resource_Name: <http://agdc.usgs.gov/data/blm/sdms/>
Access_Instructions: Internet
Fees: No Fee For Online Distribution

Metadata_Reference_Information:
Metadata_Date: 20080204
Metadata_Review_Date: 20080204
Metadata_Future_Review_Date: 02290204
Metadata_Contact:
Contact_Information:
Contact_Person_Primary:
Contact_Person: Tim Varner
Contact_Organization:
Bureau of Land Management, Alaska State Office, Division of Support Services, Branch of Information Reource Management
Contact_Position: IT Specialist
Contact_Address:
Address_Type: mailing address
Address: 222 W. 7th Ave. #13
City: Anchorage
State_or_Province: AK
Postal_Code: 99513
Country: USA
Contact_Voice_Telephone: 907-271-5799
Contact_Facsimile_Telephone: 907-271-4549
Contact_Electronic_Mail_Address: Tim_Varner@ak.blm.gov
Hours_of_Service: 0800-1630
Metadata_Standard_Name: FGDC Content Standards for Digital Geospatial Metadata
Metadata_Standard_Version: FGDC-STD-001-1998
Metadata_Time_Convention: local time
Metadata_Extensions:
Online_Linkage: <http://www.esri.com/metadata/esriprof80.html>
Profile_Name: ESRI Metadata Profile

Metadata Information
BLM Alaska Metadata Repository

Generated by mp version 2.9.2 on Wed Feb 6 13:24:01 2008