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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | GISList: SUM: Convert township-range-section to coordinates |
| Date: |
11/19/2001 04:50:43 PM |
| From: |
Bryan Keith |
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Well, this isn't much of a SUM since I still don't have an answer. Perhaps
I wasn't completely clear in my initial post (included below). I had a
number of suggestions and hints including how to calculate a polygon
centroid, how convert long-lat to UTM, how to get the bounding coordinates
of a polygon (none of which I was having trouble with). However, no one
offered a technique to approximate the center of a quarter section if that
section isn't roughly square. It's really a problem of not knowing what is
meant by "northwest quarter of the northeast quarter of section 15" when
section 15 looks more like a triangle than a square. Theoretically
sections should be square, but there are many exceptions. I'm not fretting
about it too much at this point since I still don't have the data that was
supposed to make this an "urgent" problem two weeks ago. I'll post a real
summary to this list if I find out anything new.
Bryan
-----Original Message-----
From: Bryan Keith [SMTP:bryan@geomega.com\
Sent: Thursday, November 01, 2001 5:47 PM
To: 'gislist@geocomm.com'
Subject: GISList: Convert township-range-section to coordinates
Hi List,
I am expecting to receive some data (I haven't actually seen the exact
format yet) that I need to get in real coordinate space. The problem is
that data will not have coordinates, but instead will have
township-range-section (the USA public land survey system) attributes.
From there some data (most hopefully) will be broken down into quarter
section, quarter-quarter, etc. This storage format itself is not unusual.
I've seen USGS datasets with locations stored in this way. I realize that
this information cannot be converted into an exact location, but I should
be able to get a best estimate.
I am wondering what the best way will be to calculate these coordinates. I
have some ideas, but the difficulty, of course, is when you run into
odd-shaped sections. I have the sections in UTM, and I can find their x
and y min and max and calculate the quarters from there. How have others
overcome this problem?
Thanks,
Bryan
Bryan Keith
GIS Specialist
Geomega, Inc.
Boulder, CO, USA
bryan@geomega.com
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