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:
    Dillon_rect.sid is a rectified (georeferenced) MrSID image format file that was derived from an unpublished rectified TIFF image format file which, in turn, was created by scanning a paper copy of the original map by Ruppel and others (1993).

  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: -114.076748
    East_Bounding_Coordinate: -111.938431
    North_Bounding_Coordinate: 46.051185
    South_Bounding_Coordinate: 44.943173

  3. What does it look like?

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

    Calendar_Date: 1993
    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 5471 x 7541 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 21.773280
      Ordinates (y-coordinates) are specified to the nearest 21.770393
      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?

    Ruppel and others (1993) (source 1 of 1)
    Ruppel, E.T., O'Neill, J.M., and Lopez, D.A., 1993, Geologic map of the Dillon 1x2 degree quadrangle, Idaho and Montana: U.S. Geological Survey Miscellaneous Investigations Series I-1803-H, U.S. Geological Survey, Reston, VA.

    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.

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

    Date: 2002 (process 1 of 1)
    The original paper map 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 polygon shapefile of 1:100,000-scale quadrangles (hwquad100g.shp) and a tic file coverage of UTM projected latitude and longitude coordinate points (tic120602) were used to rectify the image with ArcMap 8.1. The four corners of the TIFF image were tied to the corresponding quadrangle corners in the hwquad100g.shp file. Where additional latitude and longitude intersections were displayed on the source map, they, too, 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:

    • Ruppel and others (1993)

    Data sources produced in this process:

    • Dillon_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?

    Dillon_rect.sid has a horizontal accuracy of no better than 51 meters, which reflects the resolution of the reference file, hwquad100g.shp. The rectified image was tested to ensure it was projected and georeferenced properly by overlying it with hwquad100g.shp, a polygon shapefile of 1:100,000-scale quadrangles. Hwquad100g.shp was derived from the mathematically generated file, topoq100.shp, which was obtained from ESRI Data & Maps 2002 (CD 2) and is distributed as part of ESRI software. The positional accuracy for topoq100.shp, and thus hwquad100g.shp is 51 meters. By visual inspection at the scale of publication, the image fell within the boundaries of the four corresponding 1:100,000-scale quadrangles.

  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 09:51:25 2004