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<p class="MsoNormal"><span style="color:#993366">I never did resolve this issue, but using the python libraries instead worked out fine.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#993366">-s<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#993366"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Beale, Steven [mailto:steven.beale@woodplc.com]
<br>
<b>Sent:</b> Wednesday, March 21, 2018 3:39 PM<br>
<b>To:</b> Zachary Flamig <zac@weatherwary.com>; Steven Beale <steven.beale@woodplc.com><br>
<b>Cc:</b> gdal-dev@lists.osgeo.org<br>
<b>Subject:</b> RE: [gdal-dev] gdal translate/warp goes16<o:p></o:p></p>
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<p class="MsoNormal"><span style="color:#1F497D">Hi Zac,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">I tried to be as explicit as possible setting the source srs, including the semi-major/minor axes:<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">gdalwarp -s_srs "+proj=geos +a=6378137 +b=6356752.31414 +lon_0=-75 +h=35786023 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +no_defs +sweep=x" -t_srs EPSG:4326 -dstnodata -999.0 -tr 0.009 0.009 -te 290 40 320 65 -r near
<in> <out><o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">But I still have the longitude shifting.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Out of curiosity I tried +sweep=y, just to see what would happen, and that didn’t do anything either… could the sweep be getting ignored entirely?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Just to verify that the srs was being interpreted at all, I tried adjusting lon_0, which did work. Not very helpful though.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thinking there could possibly be some conflict in setting ellps=GRS80 and setting parameters by hand, I omitted that the +ellps. Same result.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Any other thoughts?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D">Steve<o:p></o:p></span></p>
<p class="MsoNormal"><span style="color:#1F497D"><o:p> </o:p></span></p>
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<p class="MsoNormal"><b>From:</b> Zachary Flamig [<a href="mailto:zac@weatherwary.com">mailto:zac@weatherwary.com</a>]
<br>
<b>Sent:</b> Wednesday, March 21, 2018 4:04 AM<br>
<b>To:</b> Steven Beale <<a href="mailto:steven.beale@woodplc.com">steven.beale@woodplc.com</a>><br>
<b>Cc:</b> <a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<b>Subject:</b> Re: [gdal-dev] gdal translate/warp goes16<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
<p class="MsoNormal">Hi Steven,<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">So the issue here is that gdal_translate doesn’t properly store the +sweep=x in the geotiff.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">See <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__geotiff.maptools.narkive.com_3CqwNeMd_geos-2Dprojection-2Dsweep-2Dparameter&d=DwMFaQ&c=ZWY66qCYUTYUcOev9C2GlDEcKuYKzoWDVNR_L93Z9mQ&r=xGAbC1Ogv9duClaR3TChYqg_fGB4xrhak7uN1kZcfR8&m=zVXU4kc36wijhVLYDg1WghqZOoFePzeG6PQfNC150tU&s=f466QSOBNcqeD3kETK3-K2-4KeUmCONhKlY6J9t4dMU&e=">http://geotiff.maptools.narkive.com/3CqwNeMd/geos-projection-sweep-parameter</a> for
some relevant discussion. I believe the best solution right now is to specify the s_srs in the gdalwarp command like -s_srs "+proj=geos +lon_0=-75 +h=35786023 +x_0=0 +y_0=0 +ellps=GRS80 +units=m +no_defs +sweep=x"<o:p></o:p></p>
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<p class="MsoNormal">This is a bit of a mess, sorry about that.<o:p></o:p></p>
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<p class="MsoNormal"><o:p> </o:p></p>
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<p class="MsoNormal">Zac<o:p></o:p></p>
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<p class="MsoNormal" style="margin-bottom:12.0pt"><o:p> </o:p></p>
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<p class="MsoNormal">On Mar 20, 2018, at 9:37 PM, Steven Beale <<a href="mailto:steven.beale@woodplc.com">steven.beale@woodplc.com</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal">Hi gdalers, <br>
<br>
I'm a little out of my field here, usually I work with weather/climate data,<br>
but I need to warp some goes16 satellite data. (source is aws s3:<br>
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__noaa-2Dgoes16.s3.amazonaws.com_ABI-2DL2-2DCMIPF_2018_079_12_OR-5FABI-2DL2-2DCMIPF-2DM3C01-5FG16-5Fs20180791200447-5Fe20180791211214-5Fc20180791211280.nc&d=DwMFaQ&c=ZWY66qCYUTYUcOev9C2GlDEcKuYKzoWDVNR_L93Z9mQ&r=xGAbC1Ogv9duClaR3TChYqg_fGB4xrhak7uN1kZcfR8&m=zVXU4kc36wijhVLYDg1WghqZOoFePzeG6PQfNC150tU&s=wpMH3kBCq917DTkCCXLtN0FpDoYrz6Xbmh4KZvNmrSM&e=">https://noaa-goes16.s3.amazonaws.com/ABI-L2-CMIPF/2018/079/12/OR_ABI-L2-CMIPF-M3C01_G16_s20180791200447_e20180791211214_c20180791211280.nc</a><br>
- the link should work for a few months then it will be glaciered and<br>
unavailable) <br>
<br>
source data is netcdf, I'm using nco tools & gdal for the processing. <br>
<br>
My work flow is: <br>
1. clip the data to the region of interest (north atlantic): <br>
ncks -d x,5424,8678 -d y,0,2170 <raw.nc> step1.nc <br>
2. deflate & unscale <br>
gdal_translate -ot float32 -unscale -CO COMPRESS=deflate NETCDF:step1.nc:CMI<br>
step2.tiff <br>
3. warp (in this case data is 1km resolution : ~0.009 degrees) <br>
gdalwarp -t_srs EPSG:4326 -dstnodata -999.0 -tr 0.009 0.009 -te 290 40 320<br>
65 -r near step2.tiff step3.tiff <br>
4. convert back to nc <br>
gdal_translate -ot float32 -of NETCDF step3.tiff output.nc <br>
<br>
The problem i have is that the output has the longitude shifted to the west<br>
by about 10 degrees. <br>
The issue seems related to the ncks clipping, if I exclude the x clip,<br>
everything works out fine, but takes significantly longer. <br>
Here's an example once it's loaded into an erddap server; <br>
<<a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__osgeo-2Dorg.1560.x6.nabble.com_file_t382897_GOES16-5FL2CMIPF-5FM3C01-5F201803201200.png&d=DwMGaQ&c=ZWY66qCYUTYUcOev9C2GlDEcKuYKzoWDVNR_L93Z9mQ&r=xGAbC1Ogv9duClaR3TChYqg_fGB4xrhak7uN1kZcfR8&m=0691hAhg8moDDDi0i-csopQGwl9LCy8yuefXjalO0vQ&s=cn4pjYjeC3jugb7R5Knazy7vp4bkXq-VhoKI6CAQhVs&e=">http://osgeo-org.1560.x6.nabble.com/file/t382897/GOES16_L2CMIPF_M3C01_201803201200.png</a>>
<br>
You can see greenland to the west of it's map underlay. <br>
<br>
I'm using gdal v2.3.0, netcdf v4.4.1.1, nco v4.7.3 & proj4 v5.0.0 <br>
<br>
<br>
<br>
<br>
<br>
--<br>
Sent from: <a href="https://urldefense.proofpoint.com/v2/url?u=http-3A__osgeo-2Dorg.1560.x6.nabble.com_GDAL-2DDev-2Df3742093.html&d=DwMGaQ&c=ZWY66qCYUTYUcOev9C2GlDEcKuYKzoWDVNR_L93Z9mQ&r=xGAbC1Ogv9duClaR3TChYqg_fGB4xrhak7uN1kZcfR8&m=0691hAhg8moDDDi0i-csopQGwl9LCy8yuefXjalO0vQ&s=-fnlaXGCZBUsGk7PEYpsRh26l-qFT1E4lJ9u8ZkH0vo&e=">
http://osgeo-org.1560.x6.nabble.com/GDAL-Dev-f3742093.html</a><br>
_______________________________________________<br>
gdal-dev mailing list<br>
<a href="mailto:gdal-dev@lists.osgeo.org">gdal-dev@lists.osgeo.org</a><br>
<a href="https://urldefense.proofpoint.com/v2/url?u=https-3A__lists.osgeo.org_mailman_listinfo_gdal-2Ddev&d=DwMGaQ&c=ZWY66qCYUTYUcOev9C2GlDEcKuYKzoWDVNR_L93Z9mQ&r=xGAbC1Ogv9duClaR3TChYqg_fGB4xrhak7uN1kZcfR8&m=0691hAhg8moDDDi0i-csopQGwl9LCy8yuefXjalO0vQ&s=zDMkCvDbctF6dQi2AA6bN6zdwY_AkV-EsH495ySbCRE&e=">https://lists.osgeo.org/mailman/listinfo/gdal-dev</a><o:p></o:p></p>
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