VIIRS HDF to geoTiff

[mitch....@noaa.gov]

Hi,

I was wondering if there is any way to simply add the given Lat/Lon data from the HDF5 file to say radiance and output a geotiff without having to know the "area" name.  I just want to add the native geolocation data to one granule.

Thanks in advance!

Mitch

[Martin Raspaud]

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Hi Mitch,

At the moment, mpop can only write geotiffs with a given area (or
geotransform). We actually never needed to write unprojected data to
geotiff yet...

However, you can have a look in mpop/imageo/geo_image.py, there you
have a GeoImage method called geotiff_save. It's using gdal's python
api to write data to geotiffs. The gdal api is a bit obscure, but I
found that instead of using setGeoTransform, one could use setGCPs
(ground controll points).

I tried it a bit, but couldn't find any info on how to set up GCPs.

Here what I tried (after line 309):

logger.exception("Could not load geographic data, invalid area")
srs = osr.SpatialReference()
srs.ImportFromEPSG(4326)
lons, lats = area.get_lonlats()
dst_ds.SetGCPs((lats, lons), srs.ExportToWkt())

But I got some strange error. Feel free to try it out, or tell us if
you find more info on the web...

Best regards,
Martin


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[David Hoese]

Hi Martin and Mitch,

I think if you don't include the geotransform data in a geotiff it is
essentially a tiff. Mitch, is there a reason you need this information
in a geotiff specifically? I ask because there may be a better
method/format that would serve you better.

-Dave