GrassHopper!
Now, I'm doing search and rescue of vessel at sea.
A analysis got under way and the other two wind and current rate about vessel.
Does anyone know how can GRASS store the rate of wind and current in vector map.
and, Does GRASS express in raster map ?
Thanks for your help and suggestion.
Shyh-yuan,
Analysis in GRASS is almost always done in the raster format. Refer to the
following references:
GRASS4.1 Users' Reference Manual - r.mapcalc entry (available online
using g.manual). Pay special attention to the spatial operator.
R.MAPCALC - An Algebra for GIS and Image Processing (available by
ftp'ing moon.cecer.army.mil - get /grass/grass4.1/documents/mapcalc-
algebra.ps.Z)
_Geographic Information Systems and Cartographic Modeling_ ,
by C. Dana Tomlin (1990, Prentice-Hall) (although this book doesn't
refer directly to GRASS, it is probably the definitive work on
raster-based GIS analysis).
Regards,
--
Malcolm D. Williamson - Research Assistant E-mail: malcolm@cast.uark.edu
Center for Advanced Spatial Technologies Telephone: (501) 575-6159
Ozark Rm. 12 Fax: (501) 575-3846
University of Arkansas
Fayetteville, AR 72701