Hi Janet,<br><br><div class="gmail_quote">2012/8/9 Janet Choate <span dir="ltr"><<a href="mailto:jsc.eco@gmail.com" target="_blank">jsc.eco@gmail.com</a>></span><br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
i reprojected to utm with r.proj, that worked great. however, i'm still a bit worried about the resolution. after i reprojected to utm, the region settings now show the nsres/ewres to be approx 1.0 and not 30. i can aggregate up to 30 - but i'm worried if i do so. should i trust that it is really 1 meter? i requested 1 arc second data (30m) from NED, but it is possible i ended up with 1m. do you know if there is any way to tell if the data is really 1m or already at 30m - other than with g.region?</blockquote>
<div><br>I'm not sure on that one. It could be that you've got the wrong data. However, reprojecting using r.proj takes the region settings of the target mapset. Therefore if had a resolution of 1 m beforehand, the source maps will have been resampled to 1 m while reprojecting (the default method is nearest neighbor).<br>
<br>I would zoom in and take a look at the data using the measuring tool. If it looks like it's been resampled from 30m to 1m (especially using nearest neighbor), then that's probably what happened ;)<br><br>There's a great help text on reprojecting rasters in the manual of r.proj. If you're wanting to look at it on the web, check it out here:<br>
<a href="http://grass.osgeo.org/manuals/html70_user/r.proj.html">http://grass.osgeo.org/manuals/html70_user/r.proj.html</a><br>For some reason, when I google r.proj I get two versions of the manual. The second one with the link is the one I find more helpful because it has code in it that you can pretty much cut and paste into your GRASS environment.<br>
<br>Best,<br>Daniel<br></div></div>