Rectified images of selected geologic maps of the northern Rockies area, Idaho, Montana, Washington, and Wyoming

Metadata also available as

Frequently-anticipated questions:

What does this data set describe?
    Title:
    Rectified images of selected geologic maps of the northern Rockies area, Idaho, Montana, Washington, and Wyoming
    Abstract:
    This rectified map image was created for the purpose of directly comparing an image of the original geologic map with other geospatial information. The rectified image includes the map and coordinate labels; titles, text, explanations, cross sections, and collar information were cropped.
    Supplemental_Information:
    Dist_belt_N_rect.sid is a rectified (georeferenced) MrSID image format file that was derived from an unpublished rectified TIFF image format file which, in turn, was created by scanning a paper copy of the original map by Mudge and Earhart (1983).

  1. How should this data set be cited?

    Larsen, J.C., Assmus, K.C., Causey, J.D., and Zientek, M.L., 2004, Rectified images of selected geologic maps of the northern Rockies area, Idaho, Montana, Washington, and Wyoming: U.S. Geological Survey Data Series DS 106, U.S. Geological Survey, Menlo Park, CA.

  2. What geographic area does the data set cover?

    West_Bounding_Coordinate: -113.769356
    East_Bounding_Coordinate: -112.504922
    North_Bounding_Coordinate: 49.033986
    South_Bounding_Coordinate: 47.969230

  3. What does it look like?

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

    Calendar_Date: 1983
    Currentness_Reference: Publication date of original map

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

    Geospatial_Data_Presentation_Form: raster digital data

  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. It contains the following raster data types:

      • Dimensions 10623 x 8268 x 1, type Pixel

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

      Grid_Coordinate_System_Name: Universal Transverse Mercator
      Universal_Transverse_Mercator:
      UTM_Zone_Number: 12
      Transverse_Mercator:
      Scale_Factor_at_Central_Meridian: 0.999600
      Longitude_of_Central_Meridian: -111.000000
      Latitude_of_Projection_Origin: 0.000000
      False_Easting: 500000.000000
      False_Northing: 0.000000

      Planar coordinates are encoded using row and column
      Abscissae (x-coordinates) are specified to the nearest 10.912862
      Ordinates (y-coordinates) are specified to the nearest 10.912862
      Planar coordinates are specified in meters

      The horizontal datum used is North American Datum of 1927.
      The ellipsoid used is Clarke 1866.
      The semi-major axis of the ellipsoid used is 6378206.400000.
      The flattening of the ellipsoid used is 1/294.978698.

  7. How does the data set describe geographic features?

    Band_1

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count

    Band_2

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count

    Band_3

    ObjectID
    Internal feature number. (Source: ESRI)

    Sequential unique whole numbers that are automatically generated.

    Value

    Count

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?

    N/A

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

    Michael L. Zientek
    U.S. Geological Survey
    Geologist
    904 W. Riverside, Room 202
    Spokane, WA 99201-1087

    (509) 368-3105 (voice)
    mzientek@usgs.gov

Why was the data set created?
This rectified image was created to allow the direct comparison of a published geologic map with other geospatial information in a geographic information system. The rectified image can be compared to vector representations of the same map to ensure that features are coded correctly and that all geologic information on the published map was captured in the vector files. The image also quickly illustrates how the author intended to symbolize the map.

How was the data set created?
  1. From what previous works were the data drawn?

    Mudge and Earhart (1983) (source 1 of 1)
    Mudge, M.R., and Earhart, R.L., 1983, Bedrock geologic map of part of the northern disturbed belt, Lewis and Clark, Teton, Pondera, Glacier, Flathead, Cascade, and Powell counties, Montana: U.S. Geological Survey Miscellaneous Investigations Series Map I-1375, U.S. Geological Survey, Reston, VA.

    Other_Citation_Details: Sheet 1 of 2
    Type_of_Source_Media: paper
    Source_Scale_Denominator: 250000
    Source_Contribution:
    The full map extent of the original paper map and marginal coordinate information, excluding the title, explanation, cross-sections, index maps, and other collar information, was used in this data set. Even though Mudge and Earhart's (1983) geologic map was published at a scale of 1:125,000, the geology was actually mapped on a 1:250,000-scale topographic mpa base that hat been enlarged to 1:125,000. Thus the resolution of the mapping is only as good as the base map component.

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

    Date: 2003 (process 1 of 1)
    The original paper map was cut into two pieces to fit inot the scanner. The piece showing map data was scanned and saved as a 300 dpi, 24-bit color TIFF image using a Colscan scanner at the TeckCominco Spokane Office. The scanned TIFF image was cropped to include the map and marginal coordinate information. The resulting TIFF image was rotated and color balanced using Adobe Photoshop Elements 2.0. A tic file coverage of UTM projected latitude and longitude points (tic120602utm) was used to rectify the image with ArcMap 8.1. Latitude and longitude intersections displayed on the TIFF image were tied to their respective locations (tics) in the tic120602utm coverage. The rectified TIFF was then opened in LizardTech Geospatial Encoder 1.4 and converted to MrSID image format using a 10:1 compression ratio. The resulting files include the image data (*.sid) and a world file (*.sdw). ArcGIS did not recognize coordinate information for these files, so 3001, Inc.'s RAster Georeference Enabler (RAGE) tool was used to associate coordinate information with the MrSID image. The RAGE tool is available from URL = <http://www.3001data.com/3001website/main/downloads_files/rage/geotiff_header_repair.htm>.

    Data sources used in this process:

    • Mudge and Earhart (1983)

    Data sources produced in this process:

    • Dist_belt_N_rect.sid

  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?

    Dist_belt_N_rect.sid was tested to ensure it was projected and georeferenced properly by overlying it with a latitude and longitude tic points coverage (tic120602utm) that was mathematically generated using ARC/INFO. At the scale of publication, reference points on image coincided with corresponding reference points of the tic file.

  3. How accurate are the heights or depths?

    N/A

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

    The title, text, explanation, cross section, index maps and collar information of the original data source map are cropped or partially cropped in the georeferenced MrSID image.

  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?

Access_Constraints: none
Use_Constraints:
This digital image is not meant to be used or displayed at any scale larger than 1:250,000 (for example, 1:2,000).

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

    U.S. Geological Survey, Spokane Field Office
    c/o Michael L. Zientek
    904 W. Riverside, Room 202
    Spokane, WA 99201-1087

    (509) 368-3105 (voice)
    mzientek@usgs.gov

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

    DS 106

  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 the 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 image is not meant to be used or displayed at any scale larger than 1:250,000 (for example, 1:2,000).

  4. How can I download or order the data?

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

    N/A

  6. What hardware or software do I need in order to use the data set?

    Software that supports MrSID image format is required to use this data.

Who wrote the metadata?
Dates:
Last modified: 15-Sep-2004

Metadata author:
Jeremy C. Larsen
Information Systems Support (under contract to the U.S. Geological Survey)
Contractor
904 W. Riverside, Room 202
Spokane, WA 99201

(509) 368-3118 (voice)
jlarsen@usgs.gov

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

Metadata extensions used:

Generated by mp version 2.7.33 on Wed Sep 15 09:51:33 2004