Geologic map of the Stillwater Complex, Montana: scanned source map images
This collection of four georeferenced MrSID files and one TIFF file
provides raster images of the five map sheets comprising the Geologic
map of the Stillwater Complex, Montana by Page and Nokleberg (1974).
Paper copies of the four geologic map sheets and the explanation were
scanned, and the geologic map sheets were georeferenced to the Montana
State Plane South coordinate system.
Each georeferenced MrSID image consists of a package of three files
with the extensions: sid, .sdw (MrSID world file), and .aux (ArcInfo
8.1 georeferencing information).
The MrSID and TIFF files are listed below:
i797origs1.sid/.sdw/.aux - Sheet 1 - east end of the Stillwater
i797origs2.sid/.sdw/.aux - Sheet 2 - east central part of the
i797origs3.sid/.sdw/.aux - Sheet 3 - west central part of the
i797origs4.sid/.sdw/.aux - Sheet 4 - west end of the Stillwater
i797origs5.tif - Sheet 5 - explanation of map symbols, correlation
of map units and map unit descriptions used on Sheets 1 through 4.
Page, Norman J, Nokleberg, Warren J., and Miller, Robert J., 2002, Geologic map of the Stillwater Complex, Montana: scanned source map images: U.S. Geological Survey Miscellaneous Investigations Series Map I-797, U. S. Geological Survey, Menlo Park, CA.
Planar coordinates are encoded using coordinate pair
Abscissae (x-coordinates) are specified to the nearest 0.001190
Ordinates (y-coordinates) are specified to the nearest 0.001190
Planar coordinates are specified in survey feet
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 6378206.4.
The flattening of the ellipsoid used is 1/294.978698.
R.J. Miller scanned printed paper copies of the map sheets (Page
and Nokleberg, 1974) and then georeferenced them to the Montana
State Plane South coordinate system to create GeoTIFF files for the
geologic map sheets.
The GeoTIFF files were then compressed into MrSID images.
This set of images was developed to provide georeferenced digital
images of the 1:12000-scale geologic map (Page and Nokleberg, 1974)
These images can be used in conjunction with the vector data files now
available as part of the I-797 dataset. This database is not meant to
be used or displayed at any scale larger than 1:12000 (for example,
R.J. Miller scanned printed paper geologic map sheets at 400 dpi
on a Contex Ideal FSC-8000 color scanner. The Ideal scanner is
capable of scanning at 400 dpi native resolution without utilizing
interpolation. The scans were made as index color TIFF files
allowing 256 colors. The images converted to a compressed TIFF
format using ArcInfo 8.1, then registered using ArcMAP 8.1.
The GeoTIFF files were further compressed into MrSID file format.
Date: 29-Mar-2002 (process 2 of 2)
Creation of original metadata record
Person who carried out this activity:
How accurate are the geographic locations?
The images were georeferenced after establishing a series of links.
A link is defined by 1) selecting an intersection of easting and
northing lines shown on the basemap of the image, 2) linking that
point with a calculated position (Montana State Plane South
The horizontal positional accuracy for the four registered images
is as follows:
Sheet 1: root mean square (RMS) error = 6.8 ft using 22 links,
Sheet 2: root mean square (RMS) error = 16.9 ft using 32 links,
Sheet 3: root mean square (RMS) error = 8.2 ft using 17 links,
Sheet 4: root mean square (RMS) error = 5.8 ft using 24 links.
The relatively large error in registering sheet 2 may be due to in
part to a splice in the basemap used for this sheet. The splice
has a NNE trend and occurs near the center of the sheet.
This digital database is not meant to be used or displayed at any
scale larger than 1:12,000. Any hardcopies utilizing these data
shall clearly indicate their source. If the user has modified the
data in any way they are obligated to describe the types of
modifications they have performed on the hardcopy map. User
specifically agrees not to misrepresent this data set, nor to imply
the U.S. Geological Survey approved changes the user has made.
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 GIS of the
Stillwater Complex, Montana, is not meant to be used or displayed
at any scale larger than 1:12000 (for example, 1:2000).