Re: [gdal-dev] Question: is there a way to set the TileMatrix value (aka Tile Zoom Level) for GDAL_WMTS?

2016-11-22 Thread Even Rouault
The TileLevel option is not available in the WMTS driver (as not mentionned in http://gdal.org/frmt_wmts.html) Looking at, $ gdalinfo test.xml Driver: WMTS/OGC Web Mab Tile Service Files: test.xml Size is 51220, 32712 Coordinate System is: PROJCS["WGS 84 / Pseudo-Mercator", GEOGCS["WGS 84",

[gdal-dev] Question: is there a way to set the TileMatrix value (aka Tile Zoom Level) for GDAL_WMTS?

2016-11-22 Thread esacree
Question: is there a way to set the TileMatrix value (aka Tile Zoom Level) for GDAL_WMTS? WMTS Tile Retrieval issue: WMTS Is retrieving at the wrong TileMatrix value. WMTS retrieves tiles at the maximum tile matrix (tile level or zoom level). No data is being returned. Server: http://ba

Re: [gdal-dev] Nodata values in RGB orthoimages (GeoTiff)

2016-11-22 Thread Even Rouault
On mardi 22 novembre 2016 09:08:02 CET Neumann, Andreas wrote: > Hi, > > Is there a way to store nodata values in GeoTiffs that don't match an > RGB value? I used either white or black as nodata values, but in some > rare cases these black or white pixel values do appear as valid data in > the ima

Re: [gdal-dev] slow netCDF read times

2016-11-22 Thread Pablo Rozas Larraondo
Thank you Julien, Your comment is very helpful and I think the issue that you're pointing out is very much related to my problem. I did play with setting different chunking patterns and I saw that chunking per line solved pretty much the performance issue, but I didn't understand why. Also, ticke

Re: [gdal-dev] Antialiasing problem with gdaladdo at edges/nodata sections

2016-11-22 Thread Even Rouault
Andreas, I assume you run a recent enough version of GDAL ? As the image uses JPEG compression, one explanation would be that the transition betweeen data and nodata is not "clean" (which is a feature of JPEG compresssion). Therefore you would need to first translate your image to a uncompress

Re: [gdal-dev] CAD (DWG) Driver

2016-11-22 Thread Dmitry Baryshnikov
Hi Nigel, Thank you for information. I think enhancing OpenCAD library with support of additional DWG versions is right way. I'll study your code. Best regards, Dmitry 21.11.16 13:10, Nigel Westbury пишет: The DWG driver contribution is much appreciated. It currently supports older ve

Re: [gdal-dev] slow netCDF read times

2016-11-22 Thread Julien Demaria
Hi, Maybe this is a problem with your NetCDF internal chunks cache too small and related to this ticket: https://trac.osgeo.org/gdal/ticket/5291 You can change this per-variable cache using this C function: http://www.unidata.ucar.edu/software/netcdf/docs/group__variables.html#ga2788cbfc6880ec70

[gdal-dev] Nodata values in RGB orthoimages (GeoTiff)

2016-11-22 Thread Neumann, Andreas
Hi, Is there a way to store nodata values in GeoTiffs that don't match an RGB value? I used either white or black as nodata values, but in some rare cases these black or white pixel values do appear as valid data in the image. How can I properly store nodata values in RGB Orthoimages in GeoTiff