USGS Open-File Report 02-205
Merged digital aeromagnetic data for the Middle Rio Grande and southern
Espanola basins, New Mexico
by Sweeney, Grauch, and Phillips

This directory contains a report and digital data files and descriptions of 
final compilations of total-field and reduced-to-pole aeromagnetic data from six 
surveys covering the Middle Rio Grande and southern Espanola basins.  The final, 
merged total-field aeromagnetic grid consists of data observed 100 m above 
ground.  The final, merged reduced-to-pole aeromagnetic data observed 100 m 
above ground corrects for polarity effects that are typical for aeromagnetic 
data collected at northern mid-latitudes and generally places local anomalies 
directly over their sources.  Data grid and geographically registered images for 
plotting or import into ARC/INFO or ARC/VIEW are provided.  Text files describe 
the content and format of the files.  GXFINFO.TXT describes grid files.  
IMGINFO.TXT describes TIF and PDF files.

To begin, read the file 1report.pdf.  The report explains the procedures 
followed to produce the data files, shows page-size images of the data, and 
describes the digital files available.  To view this report, you must have an 
Adobe Acrobat reader, version 4 or higher.  It is available free of charge from 
www.adobe.com.  Next, double-click on the 1report.pdf icon to load Reader and 
open the report.  Refer to the built-in help system in Reader for assistance 
with commands.  Red boxes surrounding text in the report indicate hyperlinks
to the figures.