Using Shape Files in GrADS

[Stephen R McMillan]

I am able to display shape file polygons in GrADS. However, I would like 
to be able to color-fill the component polygons according to a value, say, 
temperature. Is this possible? If so, please share how to do it.

I can draw all the lines with the 'shp_lines....' command, and an 
overall/inclusive filled polygon with the 'shp_polyf...' command, 
specifying a single color with the 'set line...' command. However, I want 
to be able to control individual shape poly fills within the inclusive 
boundaries, such as states/provinces, of the shape file. I am currently 
experimenting with the "admin98" set. The associated .dbf file contains 14 
columns/fields of geographical data, including what appear to be unique 
identifiers (US20, USA-KAN, etc.).

The command line output indicates the following syntax, with 1 to 3 
arguments:
Usage: shp_polyf shapefile [object]

How do I specify the object? Is the object the 2nd argument? What is the 
3rd argument, and how do I specify it?

The idea is that my script would read a text file as input, where 
individual shapes (such as state/province boundaries) are associated with 
temperature or some other variable.

I am using GrADS v1.9.0-rc1 (installed from OpenGrADS), on a Windows XP 
platform.

Any help on this would be appreciated.

Stephen McMillan


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