README for RevPG
                        ================


RevPG (Revision and Product Generation) was developed by the U.S.
Geological Survey (USGS) to support the revision of digital line graph
(DLG) data with ARC/INFO.  Under a Cooperative Research and Development
Agreement (CRADA) with Environmental Systems Research Institute (ESRI),
Inc., it has been ported to several Unix environments.  At the USGS, DLG 
revision is performed using a digital orthophoto quad (DOQ) which is a
high-altitude aerial photograph that has been scanned and geographically
corrected.  RevPG also provides display symbology and other support for
the production of printed maps from DLG's corresponding to standard USGS
topographic quadrangle specifications.  

RevPG is a collection of ARC/INFO Arc Macro Language (AML) programs, C
routines, shell scripts, and interface menus.  See or download the ASCII
file "install.txt" for a description of the files available in this
directory for ftp tranfer to your platform and how to install RevPG. 
When using ftp to retrieve the RevPG software, documentation, and sample
data, BINARY mode must be used.


Concerning future releases of RevPG:
====================================

Because the RevPG system is being provided free of charge via the
Internet, there is no formal mechanism for notification of new releases
of the software.  Users are encouraged to recheck the USGS National
Mapping Program homepage:  or this ftp
directory:   periodically. 

New releases will be placed here as they become available
 
Although no support to external users is pledged, comments and suggestions may
be sent to:

U. S. Geological Survey
Mid Continent Mapping Center
Att: RevPG System Manager, MS 706
1400 Independence Rd.
Rolla, MO 65401

Fax:  573-308-3652



01-August-2000