Using Shape Files in GrADS

[Stephen R McMillan]

This is a re-send of inquiry sent yesterday. Perhaps no one in user 
community has actually used the shape file feature.  If so, then this is 
intended for the person who contributed this function to v1.9.0-rc1 for 
Windows.  All I need is an EXAMPLE or two of the correct syntax when an 
"object" is involved, any additional required command arguments, and any 
pre-requisite commands.

I had done a search of the user archives regarding shape files, but found 
only my previous relevant questions and partial responses.

Thanks--
Stephen McMillan



Stephen R. McMillan/Planalytics 
07/21/2008 02:05 PM

To
GRADSUSR at LIST.CINECA.IT
cc

Subject
Using Shape Files in GrADS





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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