[GRASS-user] MODIS HDF conversion in TIF tool.

[Nikos Alexandris]

OpenEV looks like a very good alternative. If compiled as part of the FWTools
it provides the option to open HDF files. Subsetting is also possible while
exporting.

It also provides the possibility to link two images... (the "linking" I
mentioned in another post).



Nikos Alexandris wrote:
> 
> There is a handy tool called HEG [HDF-EOS To GeoTIFF Conversion Tool] with
> which one can convert HDF files into .tif. It can be used to create
> subsets as well. The tool has two modes: a. stitching/subset modus and b.
> conversion modus.
> 
> It is written in C and Java (for the GUI).
> 
> Could it be useful for GRASS? Is there any plan to implement a handy tool
> to import MODIS imagery?
> 
> * I already read almost all mails in the list referering to the HDF import
> problematic.
> 
> link: http://newsroom.gsfc.nasa.gov/sdptoolkit/HEG/HEGHome.html
> .
> FYI:
> 
> In my case, trying to convert MODIS Surface Reflectance Daily L2G Global
> 250m products from   HDF   to TIF and, at the same time the desired output
> (subset) re-projected into the Hellenic Geodetic Reference System 1987, I
> bombed into a bug probably (while in stitching/subset modus).
> 
> The tool worked also under the conversion modus, since I don't need to
> stitch several images together.
> 
> The problem now is that whenever I define the parameters for Transverse
> Mercator projection (when selected to be the custom projection of the
> output) I get an output half-way correct... By that I mean that the output
> has following projection information assigned:
> 
> Layer Spatial Reference System:
> +proj=tmerc +lat_0=0 +lon_0=24 +k=0.999600 +x_0=500000 +y_0=0
> +ellps=WGS84 +datum=WGS84 +units=m +no_defs
> 
> What I would like to have is
> +proj=tmerc +lat_0=0 +lon_0=24 +k=0.999600 +x_0=500000 +y_0=0
> +ellps=GRS80 +towgs84=-199.87,74.79,246.62,0,0,0,0 +units=m +no_defs
> 

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