U. S. Geological Survey Open-File Report 2004-1229A

COLOR SHADED-RELIEF IMAGES OF THE FINAL MAGNETIC DATA 

Color shaded-relief images of the final magnetic data are available
in two formats for each survey area. TIF images show latitude/
longitude tick marks only; they have no extra annotation so that they
can be used with other overlays.  PDF images have scales and
text for map plot purposes.  All the formats were derived originally from
color shaded-relief displays created by ERMAPPER*, using a sun azimuth of
270 degrees (west) and sun elevation of 60 degrees. Color scales are shown
on the PDF images, and differ from image to image. The types of image 
files and their uses are described briefly below.


IMAGE TYPE        IMAGE FILES
-------------     -----------------------------------------------------
TIF  (*.tif)      tmagimg.tif
 and geotif       trcwlimg.tif  (linear color scale)
 header (*.tfw)   trcwqimg.tif  (histogram-equalized color scale)
                  tpdhgimg.tif
                  trchgimg.tif
                  t83rcwlimg.tif
                  t83rcwqimg.tif


EXPLANATION
Tagged Image Format file with tick marks as the only annotation.
Without the header file, the tif file can be imported into many
standard graphics programs.  The header file provides geographic
information (geotif) for direct import into ARC/INFO and ARC/VIEW.
The .tfw file must be in the same directory as the .tif file.


IMAGE TYPE        IMAGE FILES
-------------     -----------------------------------------------------
PDF  (*.pdf)      tmagprn.pdf
                  trdrprn.pdf
                  trcwlprn.pdf
                  trcwqprn.pdf
                  tpdhgprn.pdf
                  trchgprn.pdf
                  
     
EXPLANATION
Portable Document Format file for Adobe* Acrobat readers, annotated
with tick marks, map scale, color scale bar, and brief explanation.
All pdf images have been scaled at 1:24,000.  The radar image (trdrprn.pdf)
shows flight-line locations and line numbers.

*Trade names are used for descriptive purposes only.