On Sun, May 17, 2015 at 1:32 PM, Even Rouault <[email protected]> wrote: > Le dimanche 17 mai 2015 12:54:44, Markus Neteler a écrit : >> On Sun, May 17, 2015 at 6:44 AM, Yuta Sato <[email protected]> wrote: >> > Dear GDAL and Proj Developers and Users: >> > >> > I am really frustrated when the MODIS HDF file converted into GeoTiff >> > with GCS projection never match with the same MODIS file converted from >> > MODIS Reprojection tool. >> >> We had this issue in the past, too, for our "EuroLST" project >> (gap-filling of all LST maps for Europe, see >> http://gis.cri.fmach.it/eurolst/). >> Solved since then, see below. >> ... >> >> > Do you have any idea on which is more precise: gdalwarp or MRT? Or there >> > is any way in gdalwarp to get the same image as MRT gives?
An addition: For our EuroLST project we use EU LAEA as target projection. In our tests (we made a lot) the MRT results came out shifted by 0.5 -1.0 pixel since MRT does not support a datum or ellipsoid for LAEA (LA in MRT), instead it supports only a sphere when reprojecting from MODIS sinusoidal. Using recent GDAL, gdalwarp does the reprojection from MODIS sinusoidal to EU LAEA correctly. >> You may take a look at >> http://pymodis.fem-environment.eu/ >> >> pyModis >= 1.0 comes with fast GDAL support (way faster than MRT). >> >> The details of the gdalwarp usage you find in the source code here: >> https://github.com/lucadelu/pyModis/blob/master/pymodis/convertmodis_gdal.py > > Markus, > > for the sake of my curiosity, could you explain what specific stuff it does > compared to gdalwarp ? I quickly skimmed through the file and only saw regular > use of the GDAL warping API. But perhaps I missed something. pyMODIS is a set of scripts and a library to perform the download of large numbers of MODIS HDF/XML files (think cronjob), it creates a mosaic of several tiles, it extracts specific information from bit-encoded MODIS quality assessment layers of different product types etc. Essentially a ready to use product which happily uses GDAL as a backend. Markus -- http://courses.neteler.org http://gis.cri.fmach.it/neteler/ http://grass.osgeo.org _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
