[Qgis-user] VIIRS geolocation data

[Andre Joost]

Am 09.05.2015 um 02:38 schrieb Noli Sicad:
> http://www.nsof.class.noaa.gov/saa/products/search?datatype_family=VIIRS
>
> Is this raster data?
>
> I think you have georeferenced it.
>
> http://www.digital-geography.com/qgis-tutorial-i-how-to-georeference-a-map/#.VU1W52a23FQ
>

It is not that easy. The data is raw data from a satellite flight. The 
HDF contains several subdatasets, including longitude and latitudes of 
every cell. Unfortunately, the cell coordinates are not equally spaced, 
and there is no CRS given.

The best result I get is transforming the longitude, latitude and 
aerosol subdatasets with gdal_transform to XYZ format, then stitch them 
together with LibreOffice Calc, and import them as delimited text.

It is possible to extract single bands with gdalwarp. This seems to 
work, but the GCP information inside the file is wrong. Longitudes are 
added by 180°, and the last line of GCP matches 0/0 to 0/0, which makes 
no sense to me.

Reading the data with python code inside a plugin might be an alternative.

Greetings,
André Joost