National Oceanic and Atmospheric Administration (NOAA), National Environmental Satellite, Data, and Information Service(NESDIS)
Global Monthly AVHRR Climatology Over Land
Clear-sky top-of-the-atmosphere variables
by Garik Gutman, Dan Tarpley, Aleksandr Ignatov, NOAA/NESDIS Satellite Research Laboratory, Camp Springs, Maryland
and Steve Olson, Research and Data Systems Corporation, Greenbelt, Maryland.
This is Volume 3 in the Global Change Data Base:
Editor David Hastings, NOAA/NESDIS National Geophysical Data Center, Boulder, Colorado
This is the aareadme.htm file in directory: /data/vector/idrisi
Return to the Home Page
The data contained here are vector files for coasts, islands, nations,
states, rivers, lakes, and states in IDRISI ASCII vector file format.
The data are from Micro World Data Bank II (see accompanying documentation
in the \DOCUMENT\VECTOR directory).
The subdirectory IDRISDVC contains IDRISI vector header files.
IDRISI's ASCII vector file format is relatively simple, making the data
relatively easy to convert to an ASCII import format for most vector
geographic information systems. Indeed, some GISs have importation
routines for IDRISI, making the conversion even easier.
A typical line segment has the following format:
F1 M F1 is a feature identifier for line segment 1 M is the
X1 Y1 number of X,Y (longitude,latitude) pairs that describe
X2 Y2 points, or vertices, in the line segment.
XM YM XM is the X value, and YM is the Y value, of the Mth point in the line segment.
F2 N F2 is the feature identifier for line segment 2, etc.
X1 Y1
XN YN
0 0 This marks the end of an IDRISI ASCII vector file.
This directory contains binary vector files in GRASS4.X format.
file:./aareadme.htm
Revised: 10 March 1997