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Frequently-anticipated questions:

What does this data set describe?

Title: spec_desig
This dataset contains all National Forest Inventoried Roadless Areas (IRAs) and Special Designated Areas (SDAs) for the Deschutes National Forest. This data is a subset of the national dataset for the lower 48 states. The IRA data was originally submitted to GSTC by all national forests through their Regional Offices for the Forest Service's Roadless Area Conservation Initiative.
The data was consolidated at the GSTC and used in the Draft Environment Impact Statement. Between the draft and final stages of the Environmental Impact Statement, the data was updated by the forests to reflect any corrections to Inventoried Roadless Areas that were based on existing forest plans and administrative record. The data was also supplemented to include Special Designated Area information and to include Inventoried Roadless Areas within Special Designated Areas. The data was resubmitted to the GSTC on July 21, 2000 for consolidation and the completed coverage was used in the Roadless Area Conservation Final Environmental Impact Statement.
IRAs are based on completed forest plans, forest plans in revision where the agency has established an inventory (this information should be available in Appendix C of most forest plans), or other assessments that are completed and adopted by the agency. RARE II information was used in cases where a forest does not have a more current roadless inventory, which was established using RARE II information.
All of the following editing processes were performed using ARC/INFO software.
The IRA data was originally submitted to GSTC on December 3, 1999 for the Draft Environmental Impact Statement. The data was submitted in ARC/INFO export format (.e00), in most cases as individual national forest coverages, but in some cases together with other national forests. The original datasets submitted were derived from a variety of original source manuscripts, most IRA data had a scale of 1:24,000. Some datasets were of smaller scale, typically 1:126,720. Each national forest was originally compiled at a different time, from different source material, using various methods. Region 5 submitted one file, which included all national forests in that region (primarily the state of California). In these instances, individual coverages were extracted by national forest administrative unit, and edited separately. All data was imported, projected to Albers and audited to check for INFO item consistency. Unnecessary features were removed and label errors removed.
Each national forest dataset was spatially edgematched to a national forest boundary dataset compiled at GSTC for this purpose, and attribute information was added or corrected. It was GSTC's intent to change the original data as little as possible, altering the geometry only as necessary to fit the National Forest Boundary coverage, and editing attributes only for consistency or where apparent errors occurred.
Edgematched data to National Forest Boundary coverage by 1) intersected the IRA and the NF boundary coverages using the UNION command with a fuzzy tolerance of 1.5 map units (meters) 2) deleted polygons that extended beyond NF boundary as long as they appeared to be sliver polygons created by union 3) deleted/absorbed polygons that did not extend to NF boundary by eliminating all interior polygons less than 5 acres in size that had no IRA category value or NF ownership status using ELIMINATE command 4) merged remaining polygon undershoots using the MERGE command via manual editing 5) conducted final quality assessment to check all work - this consisted of running acreage calculations for polygons before and after the edgematching process; all differences of 100 acres or greater were checked on screen and corrected if necessary; acreage calculations were run again after corrections were made to ensure there were no major changes (in some cases, changes were necessary after verifying with forest personnel that an error in the original data existed); a query was run on all coverages which resulted in a report showing frequency of polygons that had no ownership item and no IRA category - these were checked visually using hard copy maps and phone calls to forests, if necessary, to verify what the polygons in question were; all IRA coverages were also checked visually on the screen to make sure there were no additional errors.
Regional coverages were created by first appending the completed individual national forest IRA coverages into administrative regional coverages, using the APPEND command with the polygon option. This resulted in seven regional coverages for Regions: 1 (Northern), 2 (Rocky Mountain), 3 (Southwestern), 4 (Intermountain), 5 (Pacific Southwest), 6 (Pacific Northwest), 8 (Southern), and 9 (Eastern). These seven regional coverages were then appended into the national coverage, again, using the APPEND command.
The resulting national coverage was automatically edited, using the CLEAN command, with a fuzzy tolerance of 1.5 meters. This removed geometric errors, and rebuilt topology. The coverage was then reprojected from Albers to decimal degrees for consistency with all other coverages used for analysis work.
Between the draft and final stages of the Environmental Impact Statement, the data was updated by the forests to reflect any corrections to Inventoried Roadless Areas that were based on their existing forest plan. The data was also updated to include Special Designated Area information and to include Inventoried Roadless Areas within Special Designated Areas. After these updates were made the data was resubmitted to the GSTC on July 21, 2000 for consolidation.
The final consolidation of the national IRA coverage was accomplished at the GSTC with the benefit of having one representative from each region to assist with quality control. All the completed regions were appended together into the national coverage and reprojected from Albers to decimal degrees for analysis and display in the Roadless Area Conservation Environmental Impact Statement.
  1. How should this data set be cited?

    USDA Forest Service - Geospatial Service and Technology Center (GSTC), 20000915, spec_desig: AR.

    Online Links:

    • t:\r06\des\library\gis\r06\des\data\spec_desig

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -122.198864
    East_Bounding_Coordinate: -121.128849
    North_Bounding_Coordinate: 44.680301
    South_Bounding_Coordinate: 43.253306

  3. What does it look like?

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

    Calendar_Date: unknown
    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 (0)
      • Label point (185)
      • GT-polygon composed of chains (185)
      • Point (943)

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

      The map projection used is Albers Conical Equal Area.

      Projection parameters:
      Standard_Parallel: 43.000000
      Standard_Parallel: 48.000000
      Longitude_of_Central_Meridian: -120.000000
      Latitude_of_Projection_Origin: 34.000000
      False_Easting: 600000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest 0.000000
      Ordinates (y-coordinates) are specified to the nearest 0.000000
      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 6378137.000000.
      The flattening of the ellipsoid used is 1/298.257222.

      Altitude_Resolution: 0.000100
      Explicit elevation coordinate included with horizontal coordinates

  7. How does the data set describe geographic features?


    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Feature geometry. (Source: ESRI)

    Coordinates defining the features.



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

    Positive real numbers that are automatically generated.





    COLUMN ITEM NAME WIDTH OUTPUT TYPE 1 AREA 8 18 F 9 PERIMETER 8 18 F 17 SPEC_DESIG# 4 5 B 21 SPEC_DESIG-ID 4 5 B 25 NAME 80 80 C 105 CATEGORY 4 6 C 109 OWNERSHIP 2 6 C 111 FEATURE1 6 6 C 117 NAME1 80 80 C 197 COMMENT1 150 150 C 347 AUTHORITY1 4 4 C 351 FEATURE2 6 6 C 357 NAME2 80 80 C 437 COMMENT2 150 150 C 587 AUTHORITY2 4 4 C 591 ROLAYER 4 5 B 595 ROLAYERTXT 5 5 C
    Definitions: CATEGORY 1B = Inventoried Roadless Areas where road construction and reconstruction is prohibited. 1B-1 = Inventoried Roadless Areas that are recommended for wilderness designation in the forest plan and where road construction and reconstruction is prohibited. 1C = Inventoried Roadless Areas where road construction and reconstruction is not prohibited.
    FEATURE1, FEATURE2, FEATURE3 NWA = National Wilderness Area NPA = National Primitive Area NSRA = National Scenic Research Area NSA = National Scenic Area NWSR = National Wild and Scenic River NRA = National Recreation Area NGRWP = National Game Refuge and wildlife Preserve NM = National Monument NVM = National Volcanic Monument NHA = National Historic Area WSA = Wilderness Study Area RNA = Research Natural Area RNA-P = Proposed Research Natural Area OCD = Other Congressionally Designated Area WSR-E = Wild and Scenic River Eligible

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?

    USDA Forest Service - Geospatial Service and Technology Center (GSTC)

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

    USDA Forest Service - Geospatial Service and Technology Center (GSTC)

Why was the data set created?

The purpose of this spatial data set is to show where the Inventoried Roadless Areas are located. The EIS analysis team used this spatial data to assess the impacts of roadless area alternatives on Forest Service policies, use of the National Forests and the surrounding environment. It was used for analysis in combination with national characterization layers, such as ambient human population, forest mortality risk to insects and diseases, current land cover types, and others. All of these datasets include the entire lower 48 states, and are coarse resolution. (This layer contains only the Deschutes National Forest portion.) The public also had a need to know where IRAs were located in their area and across the nation. The data was used to create a set of detailed maps published both on the web and in hardcopy form, (Volume2, Roadless Area Conservation EIS).

How was the data set created?

  1. From what previous works were the data drawn?

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

    (process 1 of 3)
    Metadata imported.

    Data sources used in this process:

    • C:\DOCUME~1\djthomas\LOCALS~1\Temp\xmlC0F.tmp

    (process 2 of 3)
    Dataset copied.

    Data sources used in this process:

    • c:\workspace\planning\spec_desig

    (process 3 of 3)
    Dataset copied.

    Data sources used in this process:

    • t:\r06\ro\drm\project\gis\gis_work\gstoddard\transfer2network\spec_desig

  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?

  2. How accurate are the geographic locations?

  3. How accurate are the heights or depths?

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

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

How can someone get a copy of the data set?

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

User needs to exercise caution regarding the spatial accuracy of these data. The source scales can vary. External features cannot be expected to align. The National Forest Planning Record Documents (Appendix C), other assessments adopted by the USDA Forest Service, or RARE II documents, are ultimately the official version of inventoried roadless areas.
Data may be viewed and used by any and all entities upon request. However, data should not be changed or modified by anyone other than GSTC. The USDA Forest Service does not guarantee the accuracy of this data.

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

    Dan Thompson
    USDA Forest Service - GSTC
    2222 West 2300 South
    Salt Lake City, UT 84119

    (801) 975-3441 (voice)
    (801) 975-3478 (FAX)

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

    Downloadable Data

  3. What legal disclaimers am I supposed to read?

    The USDA Forest Service manages resource information and derived data as a service to USDA Forest Service users of digital geographic data. The USDA Forest Service is in no way condoning or endorsing the application of these data for any given purpose. It is the sole responsibility of the user to determine whether or not the data are suitable for the intended purpose. It is also the obligation of the user to apply those data in an appropriate and conscientious manner. The USDA Forest Service provides no warranty, nor accepts any liability occurring from any incorrect, incomplete, or misleading data, or from any incorrect, incomplete, or misleading use of these data.
    Much of the USDA Forest Service data are compiled, processed, and maintained with ARC/INFO software developed by the Environmental Systems Research Institute (ESRI). Much of the information presented uses conventions and terms popularized by ARC/INFO and its user community. The mention of commercial firms or products is for clarity and identification of procedures and methods only, and no endorsements are implied by the USDA Forest Service.

  4. How can I download or order the data?

Who wrote the metadata?

Last modified: 14-Sep-2009
Metadata author:
Deschutes National Forest
c/o Dorothy Thomas
GIS Specialist
REQUIRED: The city of the address., REQUIRED: The state or province of the address. REQUIRED: The ZIP or other postal code of the address.

541-383-5570 (voice)

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

Generated by mp version 2.9.6 on Mon Sep 14 09:46:52 2009