I haven't worked with MERIS on NDVI data but I know about MODIS: so let's say we have four MODIS files lvl3 data: MOD13Q1.A2010113.h08v04.005.2010133194933.hdf MOD13Q1.A2010113.h08v05.005.2010134041223.hdf MOD13Q1.A2010113.h09v04.005.2010135200404.hdf MOD13Q1.A2010113.h09v05.005.2010133080730.hdf
if you go to the map: https://lpdaac.usgs.gov/lpdaac/products/modis_overview you are going to see that these tiles represent the west coast what I do is extract the data from hdf to geotiff if you do gdalinfo MOD13Q1.A2010113.h08v04.005.2010133194933.hdf you are going to have: ... SUBDATASET_2_NAME=HDF4_EOS:EOS_GRID:"MOD13Q1.A2010113.h08v04.005.2010133194933.hdf":MODIS_Grid_16DAY_250m_500m_VI:250m 16 days EVI SUBDATASET_2_DESC=[4800x4800] 250m 16 days EVI MODIS_Grid_16DAY_250m_500m_VI (16-bit integer) SUBDATASET_3_NAME=HDF4_EOS:EOS_GRID:"MOD13Q1.A2010113.h08v04.005.2010133194933.hdf":MODIS_Grid_16DAY_250m_500m_VI:250m 16 days VI Quality SUBDATASET_3_DESC=[4800x4800] 250m 16 days VI Quality MODIS_Grid_16DAY_250m_500m_VI (16-bit unsigned integer) SUBDATASET_4_NAME=HDF4_EOS:EOS_GRID:"MOD13Q1.A2010113.h08v04.005.2010133194933.hdf":MODIS_Grid_16DAY_250m_500m_VI:250m 16 days red reflectance SUBDATASET_4_DESC=[4800x4800] 250m 16 days red reflectance MODIS_Grid_16DAY_250m_500m_VI (16-bit integer) ... you do: gdal_translate 'HDF4_EOS:EOS_GRID:"MOD13Q1.A2010113.h08v04.005.2010133194933.hdf":MODIS_Grid_16DAY_250m_500m_VI:250m 16 days NDVI' image1.tif 0...10...20...30...40...50...60...70...80...90...100 - done. so you will have your first tif you do the same for the others files and you will have: image1.tif image2.tif image3.tif image4.tif we are going to make a virtual mosaic using the vrt format: gdalbuildvrt mosaic.vrt *.tif if you open in a text editor the mosaic .vrt you are going to see the details now we are going to convert the mosaic to WGS84 projection gdalwarp -t_srs WGS84 mosaic.vrt final.tif my final.tif does not have any lines On Thu, Jul 7, 2011 at 5:02 PM, katrin eggert <katrineggert1...@gmail.com>wrote: > Greetings > I'm using gdalwarp to reproject a few tiles from platecarré to UTM WGS84 > (for a specific zone). Originally they are tiles so they don't have any > "blank" space between them but when I reproject to UTM I get a few areas in > the borders of the image. What can I do to still have a perfect match > between tiles? > Thanks > Kat > > _______________________________________________ > gdal-dev mailing list > gdal-dev@lists.osgeo.org > http://lists.osgeo.org/mailman/listinfo/gdal-dev >
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