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Thanks much for both the fix and the work around. I'll look into ncdump.<br>
<br>
<br>
<br>
--Adam<br>
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<br>
-----Original Message-----<br>
<b>From: </b>Even Rouault [<a href="mailto:even.rouault@spatialys.com">even.rouault@spatialys.com</a>]<br>
<b>Sent: </b>Monday, February 13, 2017 03:04 PM Pacific Standard Time<br>
<b>To: </b>gdal-dev@lists.osgeo.org<br>
<b>Cc: </b>Adam Dershowitz<br>
<b>Subject: </b>Re: [gdal-dev] gdalwarp has blank metadata<br>
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On lundi 13 février 2017 21:32:02 CET Adam Dershowitz wrote:</p>
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> I have been using gdalwarp to convert a geotiff to NetCDF format. The odd</p>
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> thing is that if the result is in feet, I get blank units in my output</p>
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> metadata units. While if I go to meters, I get the correct units.</p>
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> So for example this works correctly:</p>
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> gdalwarp -t_srs EPSG:3651 -of netCDF cea.tif cea_m.nc</p>
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> and gdalinof shows data like this:</p>
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> x#standard_name=projection_x_coordinate</p>
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> x#units=m</p>
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> y#long_name=y coordinate of projection</p>
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> y#standard_name=projection_y_coordinate</p>
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> y#units=m</p>
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> While this:</p>
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> gdalwarp -t_srs EPSG:3652 -of netCDF cea.tif cea_ft.nc</p>
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> Has this metadata:</p>
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> x#standard_name=projection_x_coordinate</p>
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> x#units=</p>
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> y#long_name=y coordinate of projection</p>
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> y#standard_name=projection_y_coordinate</p>
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> y#units=</p>
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> The reason that this is an issue is that I’m trying to view this data with a</p>
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> reader that is crashing due to the empty strings. I have reported a bug</p>
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> there, and it is being addressed.</p>
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But, it does seem like there is also an</p>
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> issue with gdalwarp generating these empty strings for netCDF files.</p>
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> Shouldn’t these strings contain “feet”? I did try to use gdal_edit to try</p>
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> to change that, but didn’t have any luck for the netCDF file.</p>
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> Any suggestions for how to fix these files? And, how to work around this</p>
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> problem?</p>
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Adam,</p>
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The netCDF driver didn't have support for US survey foot unit. I've added it per https://trac.osgeo.org/gdal/changeset/37378</p>
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I used the "US_survey_foot" string accordingly with</p>
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http://mooring.ucsd.edu/software/matlab/mfiles/netcdf/udunits.dat , but I'd appreciate confirmation from netCDF experts lurking around.</p>
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As a workaround you could use ncdump / ncgen to edit the existing file.</p>
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Even</p>
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--</p>
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