Georeferenced Master Title Plats of Alaska

Metadata also available as

Frequently anticipated questions:


What does this data set describe?

Title: Georeferenced Master Title Plats of Alaska
Abstract:
This dataset originated as Master Title Plats. The drawings were either scanned, or converted to a tiff image. The tiff images were georeferenced and clipped to the township boundary. The images are in an Albers Projection. This data set is missing approximately 400 township; in other words, there are 400 townships that have NOT been georeferenced and clipped. The missing townships are currently being processed.
Supplemental_Information: For further information contact Greg Balen
  1. How should this data set be cited?

    Bureau of Land Management- Alaska State Office, Branch of Mapping Sciences, Land Information Section, Unknown, Georeferenced Master Title Plats of Alaska.

    Other_Citation_Details:
    Case filles, United States Surveys (US Surveys), Rectangular Surveys, Mineral Surveys, 14(c) surveys

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -180
    East_Bounding_Coordinate: 180
    North_Bounding_Coordinate: 71.4
    South_Bounding_Coordinate: 51.2

  3. What does it look like?

  4. Does the data set describe conditions during a particular time period?

    Beginning_Date: 01-Jan-2000
    Ending_Date: Present
    Currentness_Reference: publication date

  5. What is the general form of this data set?

    Geospatial_Data_Presentation_Form: atlas

  6. How does the data set represent geographic features?

    1. How are geographic features stored in the data set?

      This is a Raster data set.

    2. What coordinate system is used to represent geographic features?

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 55
      Standard_Parallel: 65
      Longitude_of_Central_Meridian: -154
      Latitude_of_Projection_Origin: 50
      False_Easting: 0
      False_Northing: 0

      Planar coordinates are encoded using Coordinate Pair
      Abscissae (x-coordinates) are specified to the nearest 2
      Ordinates (y-coordinates) are specified to the nearest 2
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1983.
      The ellipsoid used is Geodetic Reference System 80.
      The semi-major axis of the ellipsoid used is 6378206.
      The flattening of the ellipsoid used is 1/298.2572222.

  7. How does the data set describe geographic features?

    Entity_and_Attribute_Overview:
    The tiff images are in black & white. All information outside the township has been removed (clipped). The tiff image is then georeferenced. The reference coordinates are located in the ".tfw" file. The images are in an Albers Equal Area Projection.
    Entity_and_Attribute_Detail_Citation:
    Images are listed by Meridian, Township, Range, and sometimes with their supplemental number. fairbanks_13 copper_river_12 kateel_river_44 seward_28 umiat_45 c0010n0010w000.tif
    THE ABOVE IS READ: Copper River Meridian, One north, one west (The tfw file, ( the world file), is an ASCII text coordinate file that locates the tiff image on the planet) (NOT LISTED)
    The extra space before the bering is for the half/partial township. If there is a partial township, that zero would become a "two." The 3 zeros before the period are for the supplementals; the first supplemental would be "001".
    This standard is identical to ALIS (Alaska Land Information System).


Who produced the data set?

  1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)

  2. Who also contributed to the data set?

  3. To whom should users address questions about the data?

    Greg Balen
    Bureau of Land Management
    Section Chief of Land Information Section
    222 W. 7th
    Anchorage, AK 99513
    USA

    907-271-5537 (voice)
    907-271-4549 (FAX)
    greg_balen@ak.blm.gov

    Hours_of_Service: 8:00 am - 3:00pm (Alaska Standard)
    Contact_Instructions: leave a message


Why was the data set created?

To provide a data set that can be combined in a seamless manner to support the Bureau of Land Management?s Conveyance program, land and resource management projects; wildfire, suppression/monitoring efforts, and to provide additional land information products to the public.


How was the data set created?

  1. From what previous works were the data drawn?

    MTP (Master Title Plat) (source 1 of 1)
    Bureau of Land Management- Alaska State Office, Branch of Mapping Sciences, Land Information Section, Unknown, Georeferenced_Master_Title_Plats_of_Alaska.

    Other_Citation_Details:
    Case filles, United States Surveys (US Surveys), Rectangular Surveys, Mineral Surveys, 14(c) surveys
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 31680
    Source_Contribution:
    The BLM township grid is the source that was used to collect the set of tics used for georeferencing the Master Title Plats (MTP's) images.

  2. How were the data generated, processed, and modified?

    Date: Unknown (process 1 of 1)
    Master Title Plats (MTPs) are created using land ownership information contained in case files, and land description information from US Surveys, Rectangular Surveys, Mineral Surveys 14(c) surveys, and other land descriptions. They are drawn at a scale of 1:31680 (2 inches =1 mile). Supplemental plats are used to enlarge and clearly show areas of congested status and have varying scales, depending on what is being shown.
    Originally, information on the MTP was hand drafted on Mylar. Currently, changes to the MTP are made in a digital format using AUTOCAD. All MTPs were scanned as a raster tiff image from either a microfilm image or the original Mylar, before being imported into AUTOCAD. Images of areas that have had no land actions since the initial scan may be of poorer visual quality, as they have not yet been vecortized in AUTOCAD. MTP images are displayed as 300 dpi tiff images. In 1999, scans of MTPs made from the microfilm at 400 dpi. After 1999 until late 2001 MTPs were scanned using a? true Scanner" at 400 dpi. In late 2001, a "Vidar" scanner was used. Some images were scanned from the original Mylar, and some were rescans of the microfilm.
    Currently, when new changes are made to plats in AutoCAD, images are plotted to an internal CAL driver, that converts AUTOCAD vector data to a 300 dpi raster format tiff image. The tiff images (either from original scans or CAL driver output) were displayed in a digital format and then geo-referenced and clipped to the township boundary using ESRI ARCINFO software, with an accuracy tolerance of no more than 20 feet between identical points on the geo-referenced MTP and the Albers section grid.
    The MTP data is not survey quality and is not intended for measurement use.

    Person who carried out this activity:

    Greg Balen
    Bureau of Land Management
    Section Chief of Land Information Section
    222 W. 7th
    Anchorage, AK 99513
    USA

    907-271-5537 (voice)
    907-271-4549 (FAX)
    greg_balen@ak.blm.gov

    Hours_of_Service: 8:00 am - 3:00pm (Alaska Standard)
    Contact_Instructions: leave a message
    Data sources used in this process:
    • MTP (Master Title Plat)

  3. What similar or related data should the user be aware of?


How reliable are the data; what problems remain in the data set?

  1. How well have the observations been checked?

    UNKNOWN

  2. How accurate are the geographic locations?

    UNKNOWN

  3. How accurate are the heights or depths?

    UNKNOWN

  4. Where are the gaps in the data? What is missing?

    Because the information noted in the MTP collar has been clipped off, some information may not be present. Users should be aware that for complete information the official Bureau record MTP should be consulted, as these geo-referenced MTP's are a specialty product.

  5. How consistent are the relationships among the observations, including topology?

    Raster image of the Master Title Plat, (MTP) that has been georeferenced. The scanned MTP is visually inspected and compared to the source MTP. The data has not been altered. The data is only as accurate as the MTP.


How can someone get a copy of the data set?

Are there legal restrictions on access or use of the data?

Access_Constraints:
This data set is in the public domain, and the recipient may not assert any proprietary rights thereto nor represent it to anyone as other than Bureau of Land Management's data set.
Use_Constraints:
This data is not survey quality and is not intended for measurement use.

  1. Who distributes the data set? (Distributor 1 of 1)

    Greg Balen
    Bureau of Land Management
    Section Chief of Land Information Section
    222 W. 7th
    Anchorage, AK 99513
    USA

    907-271-5537 (voice)
    907-271-4549 (FAX)
    greg_balen@ak.blm.gov

    Hours_of_Service: 8:00 am - 3:00pm (Alaska Standard)
    Contact_Instructions: leave a message
  2. What's the catalog number I need to order this data set?

  3. What legal disclaimers am I supposed to read?

    No warranty expressed or implied is made by Bureau of Land Management, (BLM), reagrding the accuracy, reliability, completeness of these data, or aggregate use use with other data.

  4. How can I download or order the data?

  5. Is there some other way to get the data?

    Contact Greg Balen.


Who wrote the metadata?

Dates:
Last modified: 23-Dec-2002
Last Reviewed: 10-Mar-2004
To be reviewed: 31-Dec-2004
Metadata author:
Dave Bieganski
Bureau of Land Mangement
Computer Specialist
222 W. 7th, Box 13
Anchorage, Alaska 99513
USA

907.271.3347 (voice)
907.271.4549 (FAX)
dave_bieganski@ak.blm.gov

Hours_of_Service: 8:00 am - 3:00pm (Alaska Standard)
Contact_Instructions: leave message
Metadata standard:
FGDC-STD-001-1998 (FGDC-STD-001-1998)


Generated by mp version 2.9.12 on Thu Mar 09 14:08:55 2017