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How to use GDAL for Translate Modis HDF to GeoTiff

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I’ve a MODIS04 L2, and I want to extract band
8:Image_Optical_Depth_Land_And_Ocean. I use Quantum GIS to open this band,
because Quantum GIS see this is not coordinates so this allow me to select
projection as below: +proj=utm +zone=50 +ellps=WGS84 +datum=WGS84 +units=m
+no_defs +towgs84=0,0,0.

All I know is that I want to translate to WGS84. This open this band seems
good but when I open this band with ENVI this is better (differents output
images). But I see the Modis Conversion Toolkit use same warp parameters as
Quantum Gis expect it has a parameters (“Numbers of Warp Points”).

I think that I miss something with Quantum Gis and GDAL too.

This is Envi Conversion Toolkit

enter image description here

This is open file HDF with QuantumGis
enter image description here

enter image description here


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