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
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