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.
This is a Raster data set. It contains the following raster data types:
Planar coordinates are encoded using row and column
Abscissae (x-coordinates) are specified to the nearest 21.706944
Ordinates (y-coordinates) are specified to the nearest 21.706944
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.
Sequential unique whole numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
Sequential unique whole numbers that are automatically generated.
N/A
Michael L. Zientek
U.S. Geological Survey
Geologist
904 W. Riverside, Room 202
Spokane, WA 99201-1087
(509) 368-3105 (voice)
mzientek@usgs.gov
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.
Fisher, F.S., McIntyre, D. H., and Johnson, K. M., 1992, Geologic map of the Challis 1°x 2° quadrangle, Idaho: U.S. Geological Survey Miscellaneous Investigations Series Map I-1819, U.S. Geological Survey, Reston, VA.
Data sources used in this process:
Data sources produced in this process:
Challis_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.
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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.
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).
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
DS 106
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).
Data format: | MrSID (version 1.4) The SID file contains the image data. The SDW file contains the world file. The AUX file contains auxiliary information such as map projection, pointer to pyramid file, etc. The XML file contains the metadata describing the data set <data set name>.sid.xml. Size: 11.921 |
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Software that supports MrSID image format is required to use this data.
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