I am sorry to send again,because in the last email,I have not describe my problem exectly,and sent it .... ----------------------------------------------------------------------------------------------------- I want to handle some hdf data through a web service,and in the web service I handle the data by grass, so the problem comes out.The following is my setps: 1)translate the hdf4 to a tif by a FWTools2.2.8 which call the gdal command actually) for example I use the command "gdal_translate [the subset] d:\aa.tif" , 2)import the tif "r.in.gdal input=D:/aaa6.tif output=ggg" 3)process the ggg data of grass format for example "r.buffer map=ggg distance=30 output=temp" 4)convert the temp to tif "r.out.gdal input=temp format=GTiff output=d:/dd.tif" Then in the web service I return the url of the dd.tif to client. I want to know the above setps right or not? and in the step of 2 and 4 problems always come out..,a common problem is the data is blank even I reset the region use "g.region rast=..." And in the step 2, I want to creat a temp location and mapset,beacuse my current location is the spanish example data... My god,I am crazying@@! Ps: Thanks Nikos Alexandris very much,since I send my problem ,he always reply me quickly and never lose her(his) pacitient...
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