Fantastic Even. Thanks a lot. (and ofc I meant to say grib2, not “gring2”)
Joaquim From: Even Rouault <even.roua...@spatialys.com> Sent: Thursday, May 8, 2025 11:04 PM To: Joaquim Manuel Freire Luís <jl...@ualg.pt>; gdal-dev@lists.osgeo.org Subject: Re: [gdal-dev] vsicurl and --range byte-range Joaquim, You can combine /vsisubfile/ (https://gdal.org/en/stable/user/virtual_file_systems.html#vsisubfile-portions-of-files) and /vsicurl/ /vsisubfile/${offset}_${length}/vsicurl/${url} e.g. $ gdalinfo /vsisubfile/802533_508958,/vsicurl/https://ecmwf-forecasts.s3.eu-central-1.amazonaws.com/20240301/00z/ifs/0p25/oper/20240301000000-24h-oper-fc.grib2 --debug on [...] Band 1 Block=1440x1 Type=Float64, ColorInterp=Undefined Description = 92500[Pa] ISBL="Isobaric surface" Metadata: GRIB_UNIT=[%] GRIB_COMMENT=Relative humidity [%] GRIB_ELEMENT=RH GRIB_SHORT_NAME=92500-ISBL GRIB_REF_TIME=1709251200 GRIB_VALID_TIME=1709337600 GRIB_FORECAST_SECONDS=86400 GRIB_DISCIPLINE=0(Meteorological) GRIB_IDS=CENTER=98(ECMWF) SUBCENTER=0 MASTER_TABLE=27 LOCAL_TABLE=0 SIGNF_REF_TIME=1(Start_of_Forecast) REF_TIME=2024-03-01T00:00:00Z PROD_STATUS=0(Operational) TYPE=1(Forecast) GRIB_PDS_PDTN=0 GRIB_PDS_TEMPLATE_NUMBERS=1 1 2 255 154 0 0 0 1 0 0 0 24 100 0 0 1 105 84 255 255 255 255 255 255 GRIB_PDS_TEMPLATE_ASSEMBLED_VALUES=1 1 2 255 154 0 0 1 24 100 0 92500 255 -127 -2147483647 Even Le 08/05/2025 à 23:48, Joaquim Manuel Freire Luís via gdal-dev a écrit : Hi, I’m writing a tool to download ECMWF forecast data in gring2 format. But since those files have > 150 bands and most of times I’m only interested in a couple of them, I’m using the only documented mechanism that I found [1], which is the “curl –range start-stop”. That works fine but what I would really like is to be able to use gdal_translate /vsicurl/… because then I should be able to save the result directly in netCDF and even get only a sub-region. But I’m not able to find a way to use both /vsicurl/ and a (equivalent) –range option. Is that possible and I didn’t find how to, or we simple cannot do it? Thanks Joaquim [1] https://confluence.ecmwf.int/display/DAC/ECMWF+open+data%3A+real-time+forecasts+from+IFS+and+AIFS#ECMWFopendata:realtimeforecastsfromIFSandAIFS-DownloadASingleFieldWithWget _______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org<mailto:gdal-dev@lists.osgeo.org> https://lists.osgeo.org/mailman/listinfo/gdal-dev -- http://www.spatialys.com My software is free, but my time generally not.
_______________________________________________ gdal-dev mailing list gdal-dev@lists.osgeo.org https://lists.osgeo.org/mailman/listinfo/gdal-dev
