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Sure, I've uploaded samples here.<br>
<br>
<a class="moz-txt-link-freetext" href="http://www.mikejcorey.com/spatial/diablo-box-sample.tif">http://www.mikejcorey.com/spatial/diablo-box-sample.tif</a><br>
<a class="moz-txt-link-freetext" href="http://www.mikejcorey.com/spatial/diablo-cutout-sample.tif">http://www.mikejcorey.com/spatial/diablo-cutout-sample.tif</a><br>
<br>
These are the same as the images created by the process I described
(but scaled down).<br>
<br>
To your point about specifying size in the first step -- will that
make the process run faster, or does it do the scaling down after it
builds the full-resolution image?<br>
<br>
Also, I notice that my filesize always gets significantly bigger
when I do the cutout step, which seems counter-intuitive to me since
in theory shouldn't there be less information present once the
cutout is done?<br>
<br>
Thanks for your help!<br>
<pre class="moz-signature" cols="72">Michael Corey</pre>
<br>
On 7/6/11 5:01 PM, Chaitanya kumar CH wrote:
<blockquote
cite="mid:CAMKgpOax64yJF7YA9yNB-iAguSEpxGY+EER_nF2Kum1wU8t5-g@mail.gmail.com"
type="cite">
<div class="moz-text-html" lang="x-unicode">Michael,<br>
<br>
Can you provide screenshots of
diablo-combined-center-utm10-70pct-box.tif and
diablo-combined-center-utm10-70pct-cutout.tif for comparison?<br>
<br>
By the way, you can perform the actions of the two
gdal_translate commands in the first step with the gdal_merge.py
script itself unless you want to use a specific resampling
algorithm.<br>
<br>
<div class="gmail_quote">On Thu, Jul 7, 2011 at 4:28 AM, Michael
Corey <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:mcorey@cironline.org">mcorey@cironline.org</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt
0.8ex; border-left: 1px solid rgb(204, 204, 204);
padding-left: 1ex;">
Hi all:<br>
<br>
I'm using a shapefile as a clipping mask to cut out the
shoreline from some DOQ files that I have merged together.
But when I do the clipping step, I end up with unwanted
semitransparency in the non-clipped areas.<br>
<br>
I'm pretty sure the problem is only with my gdalwarp step at
the end.<br>
<br>
Here's my process:<br>
<br>
gdal_merge.py -init "255" -o
diablo-combined-center-utm10.tif file file file file<br>
<br>
gdal_translate -outsize 70% 70%
diablo-combined-center-utm10.tif
diablo-combined-center-utm10-70pct.tif<br>
<br>
ogrinfo -al ./diablo_canyon_detail_clipper.shp<br>
//Extent: (XXXX, YYYY) - (XXXX, YYYY)<br>
<br>
gdal_translate -projwin XXXX YYYY XXXX YYYY
diablo-combined-center-utm10-70pct.tif
diablo-combined-center-utm10-70pct-box.tif<br>
<br>
gdalwarp -co COMPRESS=DEFLATE -cutline
./diablo_canyon_detail_clipper.shp
diablo-combined-center-utm10-70pct-box.tif
diablo-combined-center-utm10-70pct-cutout.tif<br>
<br>
Can anyone help?<br>
<br>
Thanks!<br>
<font color="#888888">
<br>
-- <br>
Michael Corey<br>
<br>
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</font></blockquote>
</div>
<br>
<br clear="all">
<br>
-- <br>
Best regards,<br>
Chaitanya kumar CH.<br>
/tʃaɪθənjə/ /kʊmɑr/ <br>
+91-9494447584<br>
17.2416N 80.1426E<br>
</div>
</blockquote>
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