On Thu, Feb 18, 2010 at 4:38 PM, Franz Schiller <[email protected]> wrote: > > > I have been using MODIS datasets in MRT tool and MATLAB but Now I want to > import MODIS projected datasets to GRASS . > > At http://grass.osgeo.org/wiki/MODIS is described methods to do this. But I > have a few (quick) questions. Thanks for your help
Quick questions yes, but not so easy to answer! > Question 1: can those methods be applied using a GRASS Script? (I believe > so) yes and no: I use MRT in batch mode within a GRASS script. Not sure if this answers your question. > Question 2: in method 1 (http://grass.osgeo.org/wiki/MODIS#Method_1), It’s > said to create a Project/mapset with EPSG 3266. Why that system? And Why if > gdal_translate will create geotiff in EPSG4326? I personally stick with http://grass.osgeo.org/wiki/MODIS#Method_0 The gdal way is too messy for me. > Question 3: Regarding a_ullr. This flag asks for Upperleft and lowerright. > This means that those values are the same for all files. But in the case > that they may vary. How can I obtain them from MODIS Metadata/header? They should be in the XML file. > And > this would mean that the we are dealing with a regular dataset because in a > Geostationary dataset this wouldn’t be possible (I guess). Geostationary (Terra and Aqua are polar orbiting)? not sure what you mean. > Question 4: What is the –co flag? I read Gdal_translate description but I > didn’t find it very clear.. -co: compression of resulting file Feel free to improve the Wiki page. > Question 5: As far as I can see, Geotiff format is used as an intermediate > format in order to import data to GRASS. Why is it chosen? Because it is well known. You can chose whatever you like and works. > Question 6: Since GDAL does not automatically georeference HDF4 images, is > there a list of the formats that GDAL automatically georreference? Yes: http://www.gdal.org/formats_list.html > Question 7: if we define a_ullr, this means that GCP points are not being > used right? I have no idea (since I prefer MRT). > Regarding method 2, that is based on GRASS6.5, will this be implemented for > grass 6.4? (the –i flag) I guess in 6.4.1 if it can be backported. Markus _______________________________________________ grass-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/grass-dev
