U. S. Geological Survey Open-File Report 99-404

Sandoval-Santa Fe and Belen Surveys, New Mexico, flown in 1998 by Sander
    Geophysics
Cochiti Survey, New Mexico, flown in 1997 by Geoterrex as part of a
    time-domain electromagnetic survey

COLOR SHADED-RELIEF IMAGES OF THE FINAL MAGNETIC DATA 

Color shaded-relief images of the final magnetic data are available
in a variety of 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.  GIF and 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 have
variable stretches, which are the same for all images from one survey
area, but differ between survey areas.  Color scales are shown on the GIF
and PDF images.  The types of image files and their uses are described
briefly below.

IMAGE TYPE        IMAGE FILES
-------------     -----------------------------------------------------
TIF  (*.tif)      ssmagimg.tif, ssmagimg.tfw (Sandoval-Santa Fe survey)
 and geotif       bmagimg.tif, bmagimg.tfw (Belen survey)
 header (*.tfw)   cmagimg.tif, cmagimg.tfw (Cochiti survey)

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
-------------     -----------------------------------------------------
GIF  (*.gif)      ssmagpic.gif  (Sandoval-Santa Fe survey)
                  bmagpic.gif (Belen survey)
                  cmagpic.gif (Cochiti survey)

EXPLANATION
Graphics Interchange Format file (GIF89a) with tick marks, map scale, color
scale bar, and brief explanation.  The gif file can be imported into many
standard graphics programs and read directly by web browsers.  When
viewed, it may be necessary to zoom out to fit the image within the screen
area.


IMAGE TYPE        IMAGE FILES
-------------     -----------------------------------------------------
PDF  (*.pdf)      ssmagpic.pdf  (Sandoval-Santa Fe survey)
                  bmagpic.pdf (Belen survey)
                  cmagpic.pdf (Cochiti survey)

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 rescaled to fit on a page with maximum
size of 11"X17" (landscape).

*Trade names are used for descriptive purposes only.