Hi Janet,<br><br>Tthe data seems to be in a geographic (angular) coordinate system, which means that you won't be able to get resolution in meters. Due to the curvature of the Earth's surface, one arc second has a different length at different latitudes. That's exactly what you're seeing in your example - 0:00:01 means 0° 0" 0'. The notation is in degrees minutes seconds (DMS) rather than decimal degrees (DD), which I prefer, but however you look at it, unless you reproject the data into a projected coordinate system like UTM, etc., the resolution will be in that unit.<br>
<br>The short version of that long story is that your data sounds like it's fine - 1 arc second is about 30m and so it looks like you've got the data you wanted and GRASS interpreted it correctly.<br><br>Best,<br>
Daniel<br clear="all">
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<br><br><div class="gmail_quote">2012/8/8 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">
<div class="gmail_quote">Hi all,<div>this seems silly, but i am a bit confused as haven't had this be an issue before. i downloaded data from USGS NED (they have changed the process since i last used). i requested data at 1 arc second (which is supposed to be approx 30 meters) </div>
<div><br></div><div>i set up a new grass dataset, reading the projection and datum terms from a georeferenced data file (referring to the w001001.adf file). at the 'set default region extent and resolution' page, the correct N/S/E/W coordinates are shown, however, the N-S & E-W resolution are set to 0.000277777777841. it would not let me change the resolution. accepted and set the region. then used r.in.gdal to import the raster (the w001001.adf file), then set the region to the new dem raster and displayed it. so all seemed to work fine. however, when i check the region settings with g.region -p, the nsres/ewres are 0:00:01.</div>
<div>i need this to be a 30 meter DEM, and am confused as to what the present resolution actually is, as i requested 30m (1 arc second) at download from NED.</div><div>anyone have any tips regarding this?</div><div><br></div>
<div>thank you,</div><div>Janet</div>
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