[gdal-dev] MODIS reprojection

[Etienne Tourigny]

I use a similar command, without the -a_ullr argument

e.g.

gdal_translate -a_srs '+proj=sinu +R=6371007.181 +nadgrids=@null +wktext'
<input HDF subdataset> <output tiff file>

On Thu, Apr 18, 2013 at 6:10 AM, Rutger <kassies at gmail.com> wrote:

> Hey Laura,
>
> Since the MxD14.A2 products are already projected in the sinusoidal
> projection there is no need to warp using GCP's. Fitting a polynomial
> through some GCP's will always be less accurate then using the projection
> the data is already in.
>
> Somewhere in the metadata in the HDF there should be a boundingbox (corner
> coordinates, in sinusoidal projection) for the specific tile you are using,
> you can then assign these with the projection using gdal_translate. Once
> assigned, you can use gdalwarp in the same way as you already described.
>
> Youre gdal_translate command should look somewhat like this:
> gdal_translate -of "VRT" -a_srs "+proj=sinu +lon_0=0 +x_0=0 +y_0=0
> +a=6371007.181 +b=6371007.181 +units=m +no_defs" -a_ullr 2223901.039333
> -3335851.559000 3335851.559000 -4447802.078667 <input HDF subdataset>
> <output vrt file>
>
> You can get the correct subdataset reference by running gdalinfo on you
> HDF.
> The coordinates i used are for tile h20v12, so make sure you use the ones
> from your tile. I used a vrt as output which you can use as an input for
> gdal_translate, but its also fine to use Geotiff or anything else you
> prefer.
>
> Hope this helps.
>
> Regards,
> Rutger
>
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> --
> View this message in context:
> http://osgeo-org.1560.x6.nabble.com/MODIS-reprojection-tp5047700p5047887.html
> Sent from the GDAL - Dev mailing list archive at Nabble.com.
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