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

[Nikos Alexandris]

There is a handy tool called HEG 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?

.
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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