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| Subject: | GISList: SUM: Surfer question |
| Date: |
01/31/2003 12:36:29 PM |
| From: |
Rick Gray |
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For those of you who were curious:
Original Problem: I wanted to create an interpolated map in Surfer -
primarily because of its great flexibility - but did not know how
to "blank out" the portions of the map that didn't belong and cover
them with lakes, etc to look like a "real" map.
Once you know, it is soooooo simple. And I am even MORE impressed
with the versitility of Surfer than I was at the outset.
Here are the steps I used:
1. Create a polygon file in ArcView of the areas you want covered (in
my case it was lakes and bounding states/provinces around southern
Ontairo)
2. In Surfer (I am using version 8.0) import the shapefile
(FILE|IMPORT) and use ARRANGE|BREAK APART to separate it into its
individual polygons. This allows you to colour them individually
(e.g. water blue, etc)
3. Use MAP|BASE MAP to open the same shape file. This allows you to
find the max/min x/y limits from the properties option. Once you have
the limits you can turn the map off if you like.
4. Open your point file and grid it, first setting the limits. When
you map it, you just have to move it to the back (ARRANGE|ORDER) and
there you have it. If necessary, to make the layers sit in the same
physical space, you might have to use MAP|OVERLAY MAPS and this will
line everything up perfectly.
I found that once I started getting a better feel for where things
were, the flexibility in changing colours, contour intervals,
labelling, etc. was unbelievable.
Next step will be to figure out how to automate the process. :)
Rick Gray
GIS Specialist, Ontario Weather Network
http://www.ownweb.ca
Liaison, GIS Post Diploma Certificate Program
Ridgetown College, University of Guelph
http://www.ridgetowncollege.com/
Tel. 519-674-1554
E-mail: rgray@ridgetownc.uoguelph.ca
Ridgetown: -81.883 W, 42.450 N
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