<head><style>body{font-size:10pt;font-family:arial,sans-serif;background-color:#ffffff;color:black;}p{margin:0px;}</style></head><body><font color="#000000"><font size="2"><font face="arial,sans-serif">Thank you Micha and Richard.<br><br>I'm not sure what to make of the complex pattern which is emerging:<br><br></font></font></font><ol><li><font color="#000000"><font size="2"><font face="arial,sans-serif">If I open a new project and enable on the fly projection without designating a project, then add both the vector and raster layers, they <i>do not</i> superimpose.</font></font></font></li><li><font color="#000000"><font size="2"><font face="arial,sans-serif">If I open a new project, enable on the fly projection, and set the project projection to "NAD 83: Oregon Lambert (feet)," the layers<i> do not </i>superimpose.</font></font></font></li><li><font color="#000000"><font size="2"><font face="arial,sans-serif">If I set the raster layer projection to Oregon Lambert from WGS 84, the files <i>do not</i> superimpose.</font></font></font></li><li><font color="#000000"><font size="2"><font face="arial,sans-serif">If I set the vector layer projection to Oregon Lambert while leaving the raster in WGS 84, they <i>do </i>superimpose.</font></font></font></li><li><font color="#000000"><font size="2"><font face="arial,sans-serif">I can clip the raster layer to the geographic extent of Oregon by entering the lat/long boundaries of the state gleaned from Wikipedia into the Clipper dialogue, but if </font></font></font>I try to clip the raster by drawing a bounding box around the counties vector, I get the "Computed -srcwin falls outside raster size . . ." error, even though the layers seemingly superimpose. It's as if I have forced them to coincide on-screen by manipulating their projections, even though they don't actually coincide.</li></ol>I don't get it.<br><br>Terry<br><blockquote style="PADDING-LEFT: 5px; MARGIN-LEFT: 0px; BORDER-LEFT: #0000ff 2px solid"><micha@arava.co.il><tmorse@teleport.com><zzzhtml style="direction: ltr;">
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On 11/08/2012 12:09, Terry Morse wrote
<blockquote cite="mid:30741963.1344676141543.JavaMail.root@mswamui-backed.atl.sa.earthlink.net" type="cite">
<pre wrap="">I'm not sure what I've done differently, but I managed tonight to get the projections to overlap. The counties vector layer appears to have been reprojected to WGS84, and the display projection is NAD 83 (EPSG: 2992). I tried to duplicate this in a second instantiation of QGIS, so far unsuccessfully. I'm going to have to experiment more.
In the interim, When I try to clip the raster file in the successful superimposition to the extent of the counties layer using the raster clipper and get the error message: Computed -srcwin falls outside raster size of 28800x19200. Any idea what that is about?
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<br>
I tried to duplicate your steps. Seems to work fine (QGIS 1.8 on
WinXP OSGeo4W installer)<br>
I downloaded the counties shapefile and loaded it into QGIS. The CRS
was listed as USER:100000 (probably since the Oregon LCC projection
it's not in the proj4 database.) So I left the CRS as is, and set
"On-the-Fly" reprojection. Next I got one tile from GMTED (30
arcsec) and it seems to overlay the counties correctly. (I'm judging
from the coastline and Columbia river, since I don't know where the
actual county boundaries are in the DEM...)<br>
<br>
Next I ran the clipper tool from the Raster menu, and again it
worked as expected. The clipped DEM remained in EPSG:4326, like the
original GMTED. I can send the clipped raster if it will be any
help. <br>
<br>
Since both layers you mentioned have full CRS metadata, I think if
you don't mess with the CRS of the layers, just enable OTF, it will
be fine.<br>
<br>
--<br>
Micha<br>
<br>
<blockquote cite="mid:30741963.1344676141543.JavaMail.root@mswamui-backed.atl.sa.earthlink.net" type="cite">
<pre wrap="">Thanks,
Terry
</pre>
<blockquote type="cite">
<pre wrap="">From: richard burcher <a class="moz-txt-link-rfc2396E" href="mailto:drownedfrog@gmail.com"><drownedfrog@gmail.com></a>
Sent: Aug 10, 2012 3:49 PM
To: <a class="moz-txt-link-abbreviated" href="mailto:qgis-user@lists.osgeo.org">qgis-user@lists.osgeo.org</a>
Subject: Re: [Qgis-user] Vector/Raster Projection Problem
Hi Terry,
You shouldn't be having such a difficult time getting them to align. I've
done similiar with SRTM/GDEM etc.
Have you projected the shapefile to wgs84 to review alignment?
Can you please put together a small subset clip of raster data for area &
the shapefile you are using. Drop me a the link from Dropbox or other
service & I will take a look over.
Cheers,
Richard
</pre>
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