Re: [gdal-dev] Can GDALCreate be Used for PNG?

Nik, No, the PNG format does not support direct creation, only creation by copying an existing dataset (GDALCreateCopy()). You can interactively see the capabilities of a driver like this: gdalinfo --format png Format Details: Short Name: PNG Long Name: Portable Network Graphics

[gdal-dev] intersection map of two maps

hello I have two raster map which have different extents. I want to create intersection map of two maps. what expression should I use ? regards -- Ahmet Temiz Jeoloji Müh. Afet ve Acil Durum Yönetimi Başkanlığı Planlama ve Zarar Azaltma Dairesi Başkanlığı Ahmet

Re: [gdal-dev] using gdalwarp with a new projection in proj.4

Michael, Healpix is not directly supported by OGRSpatialReference - the core of the coordinate system machinery for GDAL/OGR. However, you can request GDAL to treat this as a PROJ.4 extension to WKT by adding the +wktext flag. I would add that the -E and -f flags are options to the cs2cs

[gdal-dev] Convert x,y to pixel,line in an OGRLinearRing

Hello: I've got an OGRLinearRing(or OGRPolygon and its type is wkbpolygon)and affine transformation coefficients(topx,topy,cellxsize,cellysize), now I need to get pixel/line (P,L) raster space value of all points in that OGRLinearRing object.Can anyone help?

[gdal-dev] MSSQLSpatial support for non-spatial tables

Hi gdal devs, I've attached a patch to http://trac.osgeo.org/gdal/ticket/5155 to support listing, reading and writing of non-spatial tables within the MSSQLSpatial driver. The change also allows the user to set the MSSQLSPATIAL_LIST_ALL_TABLES=YES configuration option to be able to read and

Re: [gdal-dev] MSSQLSpatial support for non-spatial tables

Jeremy, Thanks for that, I'll review the patch shortly. Best regards, Tamas 2013/7/17 Jeremy Palmer jpal...@linz.govt.nz Hi gdal devs, I've attached a patch to http://trac.osgeo.org/gdal/ticket/5155 to support listing, reading and writing of non-spatial tables within the MSSQLSpatial

Re: [gdal-dev] gtiff with internal mask

Hi Even. Thanks so much for your tip! It works. I did have to specify I did not want an alpha band when cutting with the shapefile: gdalwarp -multi -wm 480 --config GDAL_CACHEMAX 256 -co photometric=ycbcr -co compress=jpeg -co alpha=no --config GDAL_TIFF_INTERNAL_MASK YES -cutline

Re: [gdal-dev] gtiff with internal mask

Well, you're right... I messed up recreating the footsteps... So, cleaning up: 1) create a rgba vrt using gdalwarp to cut the original mosaic with a shapefile gdalwarp -multi -wm 480 --config GDAL_CACHEMAX 312 -co alpha=yes -dstalpha -cutline shapes\index_diss.shp -of vrt originalmosaic.vrt

[gdal-dev] GRIB2 to NetCDF - Large areas of data missing

I am experiencing strange behavior when reprojecting/converting a GRIB2 file to NetCDF using gdalwarp, where the resulting NetCDF file is missing lots of data (or possibly being set incorrectly to NoData) west of a certain longitude. However, if I instead reproject from GRIB2 to an intermediate

Re: [gdal-dev] GRIB2 to NetCDF - Large areas of data missing

You probably are experiencing a known bug, when the warping operation needs more memory than the warp cache. Try setting adding the following to the gdalwarp command (if it doesn't work try a larger value). --config GDAL_CACHEMAX 1000 -wm 1000 Also please update the ticket with any new

Re: [gdal-dev] Can GDALCreate be Used for PNG?

Thanks Frank. So I think I need to do something like the code below instead, ie, create a MEM dataset and later create-copy to a PNG dataset. This seems to be working (although the content of the image is all wrong - but that's another issue for me to try to figure out). Thanks again, Nik.