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| GeoCommunity Mailing List |
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| Mailing List Archives |
| Subject: | Re: GISList: Locating points |
| Date: |
06/10/2002 07:58:38 AM |
| From: |
Robert Heitzman |
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...
>Assuming I have the original four points of the 2m grid in Arcview, is
>there
>a script that will determine the position of each point given the three
>distances? Does anyone have any better solutions as to how to do this
>without sophisticated surveying equipment?
I think you would be better off with two measurements - X,Y within the grid
measured from a consistent corner. Using that method it will be much easier
to "plot" the data. Accurate plotting would assume you have a good anchor
point for your grid and that the gird cells are indeed exactly 2 meters.
I haven't done any surveys like this so I'm just guessing. I'm sure someone
on the list will contribute the "correct" method.
A good model to start with would be UTM grids. Use the same origin corner to
make things easy on the GIS side. An optimal grid for GIS use would be 10
meters, but that is probably too large for a plant survey.
Are you sure you will be plotting each stem? I would guess a count within
each grid would statisfy most research issues.
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