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I just came across something that is very disturbing.
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<div>I imported a batch of points from a CSV file. </div>
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<div>2 points have the same geographic location (they are a single archaeological site occupied at different time periods)</div>
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<div>I import them into a UTM Zone 30 European Datum 1950 location and they are georeferenced using the following values:</div>
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<div><span style="font-family: Helvetica; font-size: 12px; ">x coordinate = -31415 and y coordinate = </span><span style="font-family: Helvetica; font-size: 12px; ">4116150</span></div>
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<div>Once they are in GRASS, however, they show up in 2 different places on my map. I captured the coordinates from the screen and did a query on both points and the results agree. Here are the reported locations of the 2 points</div>
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<div style="margin: 0px; font-size: 12px; font-family: Helvetica; ">East = -31418.8180586, North = 4116177.13863</div>
<div style="margin: 0px; font-size: 12px; font-family: Helvetica; ">East = -30639.9940711, North = 4116551.27956</div>
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<div style="margin: 0px; font-size: 12px; font-family: Helvetica; ">The coordinates are significantly different from each AND from the imported coordinates of the 2 points. It looks like one of the points is place close to (but not exactly) on the original
north coordinate and the other points is placed close to (but not exactly) on the original east coordinate. </div>
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<div style="margin: 0px; font-size: 12px; font-family: Helvetica; ">What is going on here???</div>
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<div style="margin: 0px; font-size: 12px; font-family: Helvetica; ">Michael</div>
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<div>____________________</div>
<div>C. Michael Barton</div>
<div>Director, Center for Social Dynamics & Complexity </div>
<div>Professor of Anthropology, School of Human Evolution & Social Change</div>
<div>Arizona State University</div>
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voice: <span class="Apple-tab-span" style="white-space: pre; "> </span>480-965-6262 (SHESC), 480-727-9746 (CSDC)<br>
fax: 480-965-7671 (SHESC), 480-727-0709 (CSDC)<br>
<div>www: <a href="http://www.public.asu.edu/~cmbarton">http://www.public.asu.edu/~cmbarton</a>,
<a href="http://csdc.asu.edu">http://csdc.asu.edu</a></div>
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