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Digital geologic map database of the Payette National Forest and vicinity, Idaho

Frequently anticipated questions:

• What does this data set describe?
  1. How should this data set be cited?
  2. What geographic area does the data set cover?
  3. What does it look like?
  4. Does the data set describe conditions during a particular time period?
  5. What is the general form of this data set?
  6. How does the data set represent geographic features?
  7. How does the data set describe geographic features?
• Who produced the data set?
  1. Who are the originators of the data set?
  2. Who also contributed to the data set?
  3. To whom should users address questions about the data?
• Why was the data set created?
• How was the data set created?
  1. From what previous works were the data drawn?
  2. How were the data generated, processed, and modified?
  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 data, including topology?
• How can someone get a copy of the data set?
  1. Are there legal restrictions on access or use of the data?
  2. Who distributes the data?
  3. What's the catalog number I need to order this data set?
  4. What legal disclaimers am I supposed to read?
  5. How can I download or order the data?
• Who wrote the metadata?

What does this data set describe?

1. How should this data set be cited?

   Lund, Karen, Derkey, Pamela D. , Brandt, Theodore R. , and Oblad, Jon R. , 1999, Digital geologic map database of the Payette National Forest and vicinity, Idaho: U.S. Geological Survey Open-File Report 98-219B, U.S. Geological Survey, Spokane WA.

   Online Links:

   • <http://pubs.usgs.gov/of/1998/ofr-98-0219-b/>

2. What geographic area does the data set cover?

   West_Bounding_Coordinate: -117.125

   East_Bounding_Coordinate: -114.5

   North_Bounding_Coordinate: 45.625

   South_Bounding_Coordinate: 44.375

3. What does it look like?

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

   Calendar_Date: 1998

   Currentness_Reference: publication date

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

   Geospatial_Data_Presentation_Form: map

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):

      • Point (1794)
      • String (6010)
      • GT-polygon composed of chains (1795)

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator

      Universal_Transverse_Mercator:

      UTM_Zone_Number: 11

      Transverse_Mercator:

      Scale_Factor_at_Central_Meridian: 0.9996

      Longitude_of_Central_Meridian: -117

      Latitude_of_Projection_Origin: 0.0

      False_Easting: 500000

      False_Northing: 0.0

      Planar coordinates are encoded using coordinate pair
      Abscissae (x-coordinates) are specified to the nearest not determined
      Ordinates (y-coordinates) are specified to the nearest not determined
      Planar coordinates are specified in METERS

      The horizontal datum used is Unknown.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.4.
      The flattening of the ellipsoid used is 1/294.98.
      

7. How does the data set describe geographic features?

   Entity_and_Attribute_Overview:

   The 'Digital geologic map database of the Payette National Forest and vicinity, Idaho' Open-File Report 98-219B text contains a detailed description of each attribute code and a reference to the associated map symbols on the map source materials. The GIS includes a geologic linework arc attribute table, pnf100k.aat, that relates to the pnf100k.con (contact look-up table), pnf100k.str (structure look-up table), pnf100k.lgu (linear geologic unit look-up table) and pnf100k.ref (descriptive source or reference data) files; a rock unit polygon attribute table, pnf100k.pat, that relates to the pnf100k.ru (rock unit look-up table) and pnf100k.ref (descriptive source or reference files); a shear zone polygon attribute table, pnfshear.pat, that relates to the pnfshear.zon (shear zone look-up table) and pnshear.ref (descriptivesource or reference data) files; and two geologic map symbol point attribute tables, pnfpnt1.pat and pnfpnt2.pat, that relate to the pnfpnt*.sym (structural point data look-up tables) and pnfpnt*.ref (descriptive source or reference data) files.

   Entity_and_Attribute_Detail_Citation:

   Please see the Open-File Report text for a complete description of entities and attributes.
   

Who produced the data set?

1. Who are the originators of the data set? (may include formal authors, digital compilers, and editors)
   • Karen Lund
   • Pamela D. Derkey
   • Theodore R. Brandt
   • Jon R. Oblad

2. Who also contributed to the data set?

   Karen Lund (USGS) mapped and compiled the geology onto stable- base material; Optronics Specialty Co., Inc. scanned the geologic map and provided minimally attributed Arc/Info interchange-format files to the USGS; Pamela D. Derkey (USGS) imported the files, transformed them to UTM zone 11 (with a y-shift) and attached and attributed an interim geologic map data model; Jon R. Oblad (Eastern Washington University) annotated the point data for output at a scale of 1:100,000.

3. To whom should users address questions about the data?
   Karen Lund
   U.S. Geological Survey
   geologist
   P.O. Box 25046, M.S. 905
   Denver, CO 80225
   USA
   

   (303) 236-5600 (voice)
   klund@usgs.gov
   

Why was the data set created?

This dataset was developed to provide geologic map GIS of the Payette National Forest for use in future spatial analysis by a variety of users.
This database is not meant to be used or displayed at any scale larger than 1:100,000 (e.g., 1:62,500 or 1:24,000).

How was the data set created?

1. From what previous works were the data drawn?

   Lund and others (1998) (source 1 of 1)

   Lund, Karen, Derkey, Pamela D. , Brandt, Theodore R. , and Oblad, Jon R. , 1999, Digital geologic map database of the Payette National Forest and vicinity, Idaho: U.S. Geological Survey Open-File Report 98-219B, U.S. Geological Survey, Spokane WA.

   Type_of_Source_Media: stable-base material: two clear film positives

   Source_Scale_Denominator: 100000

   Source_Contribution:

   Karen Lund mapped and compiled the geology of the Payette National Forest and vicinity, Idaho between 1992 and 1996. The other three authors were responsible for creating the digital product.

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

   Date: 1997 (process 1 of 1)

   Clear film positives of the 1:100,000-scale geologic map compilation were electronically scanned to create raster images, converted to vector, polygon and point GIS layers, and minimally attributed by a contractor (Optronics Specialty Co., Inc., Northridge, CA). The USGS also provided the contractor with the linework for the Snake River which had been converted from digital line graph (DLG) format files (US Geological Survey, 1993) to Arc/Info GIS so as to delineate discrete geologic unit boundaries along the western margin of the map area. The initial products were remitted to the USGS in an Arc/Info EXPORT format in scanner units and with latitude and longitude registration tics digitized from the original film positives. These tic points were used to convert (or transform) the digital files to calculated latitude-longitude points for a Universal Transverse Mercator (zone 11, with a -5,000,000 meter y-offset or false northing) map projection. The digital files were then augmented with an interim geologic map data model (or data base), further attributed and edited, and then plotted and compared to the original film positives of the geologic map to check for digitizing and attributing errors.

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?

   Attribute accuracy was verified by manual comparison of the source with hard-copy printouts and plots.

2. How accurate are the geographic locations?

   The RMS error resulting from the four file transformations ranged from 19 to 20 meters, thus the overall accuracy of the digital geologic map is no better than +/- 20 meters. It was tested by visual comparison of the source with hard-copy plots.
   

3. How accurate are the heights or depths?

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

   Geologic map units were both compiled from a variety of maps (with map scales ranging from 1:24,000 to 1:250,000 and 1 inch equals 10 miles) and mapped in the field at a scale of 1:24,000. This data was compiled at a scale of 1:100,000. Some small units and those obscured by dense forest cover may not be included in this dataset.

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

   Polygon and chain-node topology present.

How can someone get a copy of the data set?

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

Access_Constraints: None.

Use_Constraints:

This GIS is not meant to be used or displayed at any scale larger than 1:100,000 (e.g., 1:62,500 or 1:24,000).
Any hardcopies utilizing these data sets shall clearly indicate their source. If the licensee has modified the data in any way they are obligated to describe the types of modifications they have performed on the hardcopy map. Licensee specifically agrees not to misrepresent these data sets, nor to imply that changes they made were approved by the U.S. Geological Survey.

1. Who distributes the data set? (Distributor 1 of 1)
   U.S. Geological Survey Information Services
   Open-File Reports, Box 25286
   Denver, CO 80225
   USA
   

   1-303-202-4200 (voice)
   1-303-202-4693 (FAX)
   

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

3. What legal disclaimers am I supposed to read?

   The U.S. Geological Survey (USGS) provides these geographic data "as is." The USGS makes no guarantee or warranty concerning the accuracy of information contained in the geographic data. The USGS further makes no warranties, either expressed or implied as to any other matter whatsoever, including, without limitation, the condition of the product, or its fitness for any particular purpose. The burden for determining fitness for use lies entirely with the user. Although these data have been processed successfully on computers at the USGS, no warranty, expressed or implied, is made by USGS regarding the use of these data on any other system, nor does the fact of distribution constitute or imply any such warranty.
   In no event shall the USGS have any liability whatsoever for payment of any consequential, incidental, indirect, special, or tort damages of any kind, including, but not limited to, any loss of profits arising out of use of or reliance on the geographic data or arising out of the delivery, installation, operation, or support by USGS.
   This digital geologic map GIS of the Payette National Forest and vicinity, Idaho is not meant to be used or displayed at any scale larger than 1:100,000 (e.g., 1:62,500 or 1:24,000).
   

4. How can I download or order the data?

Who wrote the metadata?

Dates:

Last modified: 16-Mar-1999

Metadata author:

U.S. Geological Survey
Attn: Pamela D. Derkey
geologist
904 W. Riverside Ave., Rm. 202
Spokane, WA 99201
USA

(509) 368-3114 (voice)
(509) 368-3199 (FAX)
pderkey@usgs.gov

Metadata standard:

FGDC Content Standards for Digital Geospatial Metadata (FGDC-STD-001-1998)