Area of Critical Environmental Concern (ACEC) - Designated

Metadata also available as

Frequently anticipated questions:


What does this data set describe?

Title: Area of Critical Environmental Concern (ACEC) - Designated
Abstract:
This data set contains polygons that portray Areas of Critical Environmental Concern (ACECs) on public lands in Alaska. ACEC designations highlight areas where special management attention is needed to protect, and prevent irreparable damage to, important historic, cultural, and scenic values, fish, or wildlife resources or other natural systems or processes; or to protect human life and safety from natural hazards. ACECs are indentified, evaluated and designated through BLM's resource management planning process. Research natural areas (RNAs), outstanding natural areas (ONAs) and natural hazard areas (NHAs) are also categorized as ACECs.
Supplemental_Information:
Mt Prindle RNA was adjusted in June of 2005. The RNA was adjusted to include sections 1 and 2, and portions of sections 3, 10, 11 and 12 of Twp. 7N 6E F.B.M. Nov. 2006 Indian River ACEC and Nulato Hills ACEC adjusted - adding acreage. Jan. 2006 - the following ACECs were adjusted - adding acreage - Nugget Creek, West Fork Atigun, Galbraith Lake and Nigu/Iteriak.
  1. How should this data set be cited?

    Bureau of Land Management - Alaska State Office, Division of Resources, 20100826, Area of Critical Environmental Concern (ACEC) - Designated.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -165.857349
    East_Bounding_Coordinate: -141.906499
    North_Bounding_Coordinate: 69.471798
    South_Bounding_Coordinate: 59.160749

  3. What does it look like?

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

    Calendar_Date: 26-Aug-2010
    Currentness_Reference: publication date

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

    Geospatial_Data_Presentation_Form: vector digital data

  6. How does the data set represent geographic features?

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

      This is a Vector data set. It contains the following vector data types (SDTS terminology):

      • G-polygon (52)

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

      Horizontal positions are specified in geographic coordinates, that is, latitude and longitude. Latitudes are given to the nearest 0.000000001746084. Longitudes are given to the nearest 0.000000001746084. Latitude and longitude values are specified in Decimal degrees.

      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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

  7. How does the data set describe geographic features?

    acec_desig_poly
    Digitized ACEC polygons and attribute table. The table contains the attribute values of for ACECs. (Source: BLM)

    objectid
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    acec_id
    The designed primary key that will uniquely identify a single occurrence of the entity. The primary key for ACEC will be 10 digits. The first four will be "ACEC" and the last six digits will be a sequential number. (Source: BLM)

    Designated primary key that uniquely identifies each ACEC feature

    loc_acec_id
    The current identifier that was used by a state or field office to identify an ACEC at the state or field office level. (Source: BLM)

    Range of values
    Minimum:01
    Maximum:55
    Units:01

    acec_name
    The name of the ACEC taken from the Record of Decision and Land Use Plan which officially designated the ACEC. (Source: BLM)

    ValueDefinition
    Anvik River ACECAnvik River Area of Critical Environmental Concern
    Arms Lake RNAArms Lake Research Natural Area
    Bering Glacier RNABering Glacier Research Natural Area
    Big Windy Hot Spring RNABig Windy Hot Spring Research Natural Area
    Box River Treeline RNABox River Treeline Research Natural Area
    Carter Spit ACECCarter Spit Area of Critical Environmental Concern
    Dulbi-Kaiyuh Mountains Subunit ACECDulbi-Kaiyuh Mountains Subunit Area of Critical Environmental Concern
    Galbraith Lake ACECGalbraith Lake Area of Critical Environmental Concern
    Galena Mountain ACECGalena Mountain Area of Critical Environmental Concern
    Gisasa River ACECGisasa River Area of Critical Environmental Concern
    Hogatza River Tributaries ACECHogatza River Tributaries Area of Critical Environmental Concern
    Indian River ACECIndian River Area of Critical Environmental Concern
    Inglutalik River (CY) ACECInglutalik River (CY) Area of Critical Environmental Concern
    Inglutalik River (KSP) ACECInglutalik River (KSP) Area of Critical Environmental Concern
    Ishtalitna Creek Hot Springs RNAIshtalitna Creek Hot Springs Research Natural Area
    Jim River ACECJim River Area of Critical Environmental Concern
    Kanuti Hot Springs ACECKanuti Hot Springs Area of Critical Environmental Concern
    Kateel River ACECKateel River Area of Critical Environmental Concern
    Kuskokwim River ACECKuskokwim River Area of Critical Environmental Concern
    Lake Todatonten Pingos RNALake Todatonten Pingos Research Natural Area
    Limestone Jags RNALimestone Jags Research Natural Area
    McQuesten Creek RNAMcQuesten Creek Research Natural Area
    Mount Osborn ACECMount Osborn Area of Critical Environmental Concern
    Mount Prindle (SNCA) RNAMount Prindle (SNCA) Research Natural Area
    Mount Prindle (WMNRA) RNAMount Prindle (WMNRA) Research Natural Area
    Neacola Mountains ACECNeacola Mountains Area of Critical Environmental Concern
    Nigu-Iteriak ACECNigu-Iteriak Area of Critical Environmental Concern
    North River ACECNorth River Area of Critical Environmental Concern
    Nugget Creek ACECNugget Creek Area of Critical Environmental Concern
    Nulato Hills (CY) ACECNulato Hills (CY) Area of Critical Environmental Concern
    Nulato Hills (KSP) ACECNulato Hills (KSP) Area of Critical Environmental Concern
    Poss Mountain ACECPoss Mountain Area of Critical Environmental Concern
    Redlands Lake RNARedlands Lake Research Natural Area
    Sagwon Bluffs ACECSagwon Bluffs Area of Critical Environmental Concern
    Serpentine Slide RNASerpentine Slide Research Natural Area
    Shaktoolik River (CY) ACECShaktoolik River (CY) Area of Critical Environmental Concern
    Shaktoolik River (KSP) ACECShaktoolik River (KSP) Area of Critical Environmental Concern
    Snowden Mountain ACECSnowden Mountain Area of Critical Environmental Concern
    South Todatonten Summit RNASouth Todatonten Summit Research Natural Area
    Southwest Peregrine Falcon Habitat ACECSouthwest Peregrine Falcon Habitat Area of Critical Environmental Concern
    Spooky Valley RNASpooky Valley Research Natural Area
    Sukakpak Mountain ACECSukakpak Mountain Area of Critical Environmental Concern
    Utility CorridorSulukna River Area of Critical Environmental Concern
    Toolik Lake RNAToolik Lake Research Natural Area
    Tozitna River ACECTozitna Subunit North Area of Critical Environmental Concern
    Tozitna Subunit South ACECTozitna Subunit South Area of Critical Environmental Concern
    Unalakleet River ACECUnalakleet River Area of Critical Environmental Concern
    Ungalik River (CY) ACECUngalik River (CY) Area of Critical Environmental Concern
    Ungalik River (KSP) ACECUngalik River (KSP) Area of Critical Environmental Concern
    West Fork Atigun River ACECWest Fork Atigun River Area of Critical Environmental Concern
    Western Arctic Caribou Insect Relief ACECWestern Arctic Caribou Insect Relief Area of Critical Environmental Concern
    Tozitna Subunit North ACECTozitna Subunit North Area of Critical Environmental Concern

    casefile_no
    The number that refers to the serialized case file number of the group of official documents that record the facts, or actions taken, on a specific application, such as an oil and gas lease, exchange, airport lease, easement acquisition, etc. (CMR). This field should be in uppercase (for example, OR035582). This is a BLM International Organization for Standardization (ISO) assigned number used for identification of all lands and minerals case files including ACECs. This is the link to the LR2000 database. N/A - Not Applicable is the default code and will be used when no casefile number has been assigned. A value of "UNK" indicates unknown. (Source: BLM)

    ValueDefinition
    FF085208AKFF 085208
    FF085208AKFF 085208
    FF086817AKFF 086817
    FF086818AKFF 086818
    FF086945AKFF 086945
    FF086974AKFF 086974
    FF087073AKFF 087073
    FF087077AKFF 087077
    FF087078AKFF 087078
    UNKUnknown casefile number

    lup_name
    The name given to a project that represents the full, official name associated with the project. (Source: BLM)

    ValueDefinition
    Bay RMPBay Resource Management Plan
    Central Yukon Planning AreaCentral Yukon Planning Area
    East Alaska RMPEast Alaska Resource Management Plan
    Kobuk-Seward Peninisula RMPKobuk-Seward Peninisula Resource Management Plan
    Ring of Fire RMPRing of Fire Resource Management Plan
    Southwest MFPSouthwest Management Framework Plan
    Steese NCA RMPSteese NCA Resource Management Plan
    Utility CorridorUtility Corridor
    White Mountains NRA RMPWhite Mountains NRA Resource Management Plan

    acec_est_acr
    The measure of the area estimated in the designation process for land use planning. This is the designated size (acres) and may be different than the actual area. This does not change. Acres are calculated using the following formula: [Acres = Area (in meters)/4046.87]. This may be different than the GIS calculated area of the ACEC polygon. This field value should be the same for each polygon in an ACEC comprised of multiple polygons. The values in this field do not change. Do not use this field to derive GIS acres. (Source: BLM)

    Acres are calculated using the following formula: [Acres = Area (in meters)/4046.87]

    rod_date
    The date on which the decision is signed by the person who has approval authority for the decisions. The ROD signing date of the monitoring or activity plan, if any, for the particular ACEC. The date will be in the format of MM/DD/YYYY. (Source: BLM)

    Range of values
    Minimum:11/25/1981
    Maximum:11/04/2008
    Units:date

    gis_acres
    This is a calculated value of area in units of acres based on the area field created by default within the ESRI Polygon data structure. For the purposes of a 'national data layer', the data are to be stored in geographic coordinates which do not correspond to ground values. This requires that there be a standard method for calculating this attribute. The method used for these data are as follows: The data are projected into a standard projection such as the ESRI default Albers projection for the continental United States, "US Albers NAD 1983." Once the data are projected, then a calculation of "SHAPE_Area (square meters) * 0.0002471044 = acres" is applied to the existing 'area' field that is default area created by the ESRI software resulting in the field (Attribute) 'SHAPE_Area'. Please note that the figure used in this calculation is the factor for converting the US Survey Foot value of for the length of a meter as opposed to the International Standard for converting meters and feet. (Source: BLM)

    Range of values
    Minimum:43
    Maximum:1,528,999
    Units:1

    admin_st
    An administrative unit that identifies the state or geographic area which has administrative jurisdiction over lands, and cases, although the land for a case may not be physically located in a state. Only those states that are BLM administrative states are in the domain for this entity. Example: Montana is the Administrative State for public lands in the geographic States of Montana, South and North Dakota. A two letter, upper case abbreviation for the administrative state office. Attribute Domain Assignment: DOM_ADMIN_ST Default: XX (Source: BLM)

    ValueDefinition
    AKAlaska

    adm_ofc_cd
    BLM administrative office (which is subordinate to the state office) that has jurisdiction and/or management authority over lands within a geographic area. This is a six-digit code. In the FBMS Organization Codes, use the six characters after the State designators. e.g. LLAK030900) (Source: BLM)

    ValueDefinition
    A01000Anchorage Field Office
    A02000Glennallen Field Office
    F03000Central Yukon Field Office

    adm_unit_cd
    The BLM administrative unit/office that is a combination of Administrative State Code and Administrative Office Code that fully identifies the geographic area which has jurisdiction over the lands. This is an eight-character code. In the FMBS Organization Codes, use the last eight characters (e.g. LLAK030900). The field should be populated with the office code for the lowest level of the organization with jurisdiction. (Source: BLM)

    ValueDefinition
    AKA01000Anchorage Field Office
    AKA02000Glennallen Field Office
    AKF03000Central Yukon Field Office

    sensitivity
    The BLM administrative unit/office that is a combination of Administrative State Code and Administrative Office Code that fully identifies the geographic area which has jurisdiction over the lands. This is an eight-character code. In the FMBS Organization Codes, use the last eight characters (e.g. LLAK030900). The field should be populated with the office code for the lowest level of the organization with jurisdiction. (Source: BLM)

    ValueDefinition
    PUBPublic Information

    comments
    The text that provides additional information about the Area of Critical Environmental Concern. (Source: BLM)

    ValueDefinition
    Anadromous fish habitatAnadromous fish habitat
    Caribou insect relief areaCaribou insect relief area
    Caribou winter rangeCaribou winter range
    Chum salmon habitatChum salmon habitat
    Crucial Caribou Calving HabitatCrucial Caribou Calving Habitat
    Crucial Peregrine Falcon HabitatCrucial Peregrine Falcon Habitat
    Cultural, Rare or Sensitive Plants, Scenic Values, and Lambing AreasCultural, Rare or Sensitive Plants, Scenic Values, and Lambing Areas
    Fishery, recreation, culturalFishery, recreation, cultural
    Geology, culturalGeology, cultural
    Hot springHot spring
    Kiguaik Arctic Char habitatKiguaik Arctic Char habitat
    Lambing areas, mineral lickLambing areas, mineral lick
    Natural Scientific FeaturesNatural Scientific Features
    Natural scenery and visual resourcesNatural scenery and visual resources
    Peregrine FalconsPeregrine Falcons
    Peregrine falcon habitatPeregrine falcon habitat
    Raptor nesting habitatRaptor nesting habitat
    Research activities, culturalResearch activities, cultural
    Salmon and Sheefish Spawing HabitatSalmon and Sheefish Spawing Habitat
    Scenic, geologyScenic, geology
    Steller's Eider protectionSteller's Eider protection
    Unique ecological valuesUnique ecological values

    globalid
    Software generated value. A field of type UUID (Universal Unique Identifier) in which values are automatically assigned by the geodatabase when a row is created. This field is not editable and is automatically populated when it is added for existing data. (Source: BLM)

    Software generated value

    shape
    Feature geometry. (Source: ESRI)

    Coordinates defining the features.

    SE_Area(shape)
    Area of feature in internal units squared. (Source: ESRI)

    Automatically generated

    SE_Length(shape)
    Length of feature in internal units. (Source: ESRI)

    Automatically generated


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?

    Bureau of Land Management
    Attn: Doug Herzog
    Environmental Planner
    222 W 7th Ave #13
    Anchorage, AK 99513
    USA

    (907) 271-03202 (voice)
    dherzog@blm.gov


Why was the data set created?

To make ACECs available in a digital format (as polygons). Each polygon has a digital link to its' attributes (ACEC name, acreage, etc.). Attributes are stored in a data table, which is provided.


How was the data set created?

  1. From what previous works were the data drawn?

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

    Date: 01-Jan-2004 (process 1 of 3)
    Areas of Critical Environmental Concern (ACECs) were presented for digitizing as hand drawn outlines, on multiple maps of various types and scale. The ACEC outlines are generalized portrayals of geographic areas that often, but not in all cases, follow a watershed boundary.
    Maps were scanned, at 400 DPI, georeferenced using ARC/GIS Software and saved as geotif files. The geotif files were imported into ArcMap. The ACEC outlines were screen digitized (creating a polygon layer), using ARCGIS/ArcMap Software.
    During digitization, the outlines of the ACECs on the scanned maps were adjusted to reflect changes in land status since the ACECs were originally designated . ACECs exist on Public Lands only. Since the original ACEC designations were made, some lands within ACECs have been conveyed, tentatively conveyed or interimly conveyed to the State of Alaska or to Native entities. These lands are no longer Public Lands and as such are not included within the ACEC.
    Land status used to adjust the ACEC outlines was obtained from the Bureau of Land Management's (BLM) Genstat/Land Status Database. Genstat/Land Status data originates in the BLM's Alaska Land Information System (ALIS). The Land Status attributes are a snapshot of the Land Information System Database and are only as accurate as that database. The data is produced to the section (square mile) level. Data from the Dec. 2003 Genstat/Land Status database was used to adjust the ACEC outlines. See the Feature Attribute Table for list of adjusted ACECs.
    All but 2 ACECs were digitized by the Alaska State Office. These 2, George River ACEC and Oskawalik River ACEC, were digitized by the Anchorage Field Office and supplied as shapefiles to the Alaska State Office. The shapefiles were appended to the Alaska State Office ACEC polygons, to form a complete polygon layer.
    This data is NOT survey quality and is not intended for measurement use.

    Person who carried out this activity:

    Bureau of Land Management
    Attn: Rhonda Reynolds
    Cartographer
    222 W 7th Ave #13
    Anchorage, AK 99513
    USA

    (907) 271-3275 (voice)
    rreynold@ak.blm.gov

    Date: 19-Jan-2006 (process 2 of 3)
    Mt Prindle RNA was adjusted in June of 2005. The RNA was adjusted to include sections 1 and 2, and portions of sections 3, 10, 11 and 12 of Twp. 7N 6E F.B.M.
    Jan. 2006 - The following ACECs were adjusted - adding acreage - Nugget Creek, West Fork Atigun, Galbraith Lake, Nigu/Iteriak.

    Person who carried out this activity:

    Bureau of Land Management
    Attn: Rhonda Reynolds
    Cartographer
    222 W 7th Ave #13
    Anchorage, AK 99513
    USA

    (907) 271-3275 (voice)

    Date: 26-Aug-2010 (process 3 of 3)
    Process_Description: Updates were made to include all BLM-Alaska ACECs. A thorough review of all BLM-Alaska land use plans was completed to ensure all ACECs included were validly designated. The George River ACEC and the Oskawalik River ACEC were found to be invalid; therefore, they were removed from the data set. The data for the three ACECs designated in the Southwest MFP, the Anvik River ACEC, the Kuskokwim River ACEC, and the Southwest Peregrine Falcon Habitat ACEC, was created using the hard copy maps included in the plan. Due to the lack of quality of Southwest MFP maps, the data for these three ACECs generally reflects a one-mile buffer placed around marking on the maps, which depict the intended locations of the ACECs. No digital data previously existed for these three ACECs. The Anvik River ACEC, the Kuskokwim River ACEC, and the Southwest Peregrine Falcon Habitat ACEC were the only ACECs that did not have previous digital data to reference.

    Person who carried out this activity:

    Burreau of Land Management
    Attn: Doug Herzog
    Environmental Planner
    222 W 7th Ave #13
    Anchorage, AK 99513
    USA

    (907) 271-3202 (voice)
    dherzog@blm.gov

  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?

    Complete - unknown values are shown as UNK

  2. How accurate are the geographic locations?

    Polygons were screen digitized from multiple georeferenced maps that had been photocopied before scanning and may have had distortion introduced in the copying process. The photocopies were the best available data at the time of this project

  3. How accurate are the heights or depths?

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

    This data has been visually inspected at the "each polygon" level. Beyond the inspection of the digital records, the accuracy depends on the accuracy of each georeferenced map as well.

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

    Topology exists


How can someone get a copy of the data set?

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

Access_Constraints:
Discretionary, contains no sensitive information - generally considered releasable.
Use_Constraints:
This data is NOT survey quality and is not intended for measurement use.
ACECs were digitized from georeferenced maps of various types and scales. Accuracy of the data depends on the accuracy of the georeferenced map. Georeferencing of some maps may have been adversely affected, due to distortion introduced when the maps were duplicated - many of the maps provided for digitizing are photo copies of the originals.
Any hardcopies or published datasets using these data shall clearly indicate their source. Any users wishing to modify the data are obligated to describe the types of modification they have performed. User specifically agrees not to misrepresent the data, nor to imply that changes made were approved or endorsed by the Bureau of Land Management

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

    Bureau of Land Management
    Attn: Doug Herzog
    Environmental Planner
    222 W 7th Ave #13
    Anchorage, AK 99513
    USA

    (907) 271-0302 (voice)
    dherzog@blm.gov

  2. What's the catalog number I need to order this data set?

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    No warranty 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.

  4. How can I download or order the data?


Who wrote the metadata?

Dates:
Last modified: 02-Feb-2011
Last Reviewed: 02-Feb-2011
To be reviewed: 02-Feb-2012
Metadata author:
Bureau of Land Management
Attn: Doug Herzog
Environmental Planner
222 W 7th Ave #13
Anchorage, AK 99513
USA

(907) 271-0302 (voice)
dherzog@blm.gov

Metadata standard:
FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)
Metadata extensions used:


Generated by mp version 2.9.12 on Thu Mar 09 14:08:16 2017