Hello, I have some doubts on the usage of some gdal tools. I'm trying to make a R script, but I know that we can run gdal commands from the terminal and also from QGIS. I use Linux/Ubuntu.
Well, after converting a hdf file from MODIS Aqua (L3) with sea surface temperature data to tif I want to reproject to SIRGAS2000 and clip between lats of 22 to 29 S and lats of 40 to 50 W. HDF file (need to unpack) can be downloaded at https://app.box.com/s/16cf7qv6af6gsz1v66staori2mtneu0r To convert HDF file I'm using: gdal_translate("A20080012008031.L3m_MO_SST_4","georef.tif",sd_index=1,a_ullr=c(0,4320,8640,0), a_srs="+proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371007 +b=6371007 +units=m +no_defs") Without a_ullr and a_srs options I was getting an error message when using gdalwarp: "ERROR 1: Unable to compute a transformation between pixel/line and georeferenced coordinates" a_ullr and a_srs values I got with GDALinfo("georef.tif"). I also tryed a_ullr=c(-180,90,180,-90). My problem now is reproject to SIRGAS2000 and clip the image georef.tif: gdalwarp("georef.tif", "georef2.tif", s_srs="+proj=eqc +lat_ts=0 +lat_0=0 +lon_0=0 +x_0=0 +y_0=0 +a=6371007 +b=6371007 +units=m +no_defs", t_srs="+proj=longlat +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +no_defs") georef2.tif is not in SIRGAS2000 projection and clipping option te=c(-50,-29,-40,-22) does not work. Where is my mistake? I hope someone can tell me. Thanks for any help. Antonio Olinto
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