I am trying to use gdalwarp to project a polar stereographic image to a mercator projection epsg 28992 (for use in leaflet)
gdalinfo "HDF5:\"RAD_NL25_PCP_NA_202010271205.h5\"://image1/image_data"
Driver: HDF5Image/HDF5 Dataset
Files: RAD_NL25_PCP_NA_202010271205.h5
Size is 700, 765
Metadata:
geographic_geo_column_offset=0
geographic_geo_dim_pixel=KM,KM
geographic_geo_number_columns=700
geographic_geo_number_rows=765
geographic_geo_par_pixel=X,Y
geographic_geo_pixel_def=LU
geographic_geo_pixel_size_x=1.0000035
geographic_geo_pixel_size_y=-1.0000048
geographic_geo_product_corners=0 49.362064 0 55.973602 10.856453 55.388973 9.0093002 48.895302
geographic_geo_row_offset=3649.9819
geographic_map_projection_projection_indication=Y
geographic_map_projection_projection_name=STEREOGRAPHIC
geographic_map_projection_projection_proj4_params=+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378.14 +b=6356.75 +x_0=0 y_0=0
image1_calibration_calibration_flag=Y
image1_calibration_calibration_formulas=GEO = 0.500000 * PV + -32.000000
image1_calibration_calibration_missing_data=0
image1_calibration_calibration_out_of_image=255
image1_image_bytes_per_pixel=1
image1_image_geo_parameter=REFLECTIVITY_[DBZ]
image1_image_product_name=RAD_NL25_PCP_H1.5_NA
image1_image_size=535500
image1_statistics_stat_max_value=44.5
image1_statistics_stat_min_value=-31.5
overview_hdftag_version_number=3.6
overview_number_image_groups=1
overview_number_radar_groups=3
overview_number_satellite_groups=0
overview_number_station_groups=0
overview_products_missing=NA
overview_product_datetime_end=27-OCT-2020;12:05:00.000
overview_product_datetime_start=27-OCT-2020;12:05:00.000
overview_product_group_name=RAD_NL25_PCP_NA
radar1_radar_location=5.17834 52.101681
radar1_radar_name=DeBilt
radar1_radar_operational=0
radar2_radar_location=4.7999701 52.953339
radar2_radar_name=DenHelder
radar2_radar_operational=1
radar3_radar_location=5.1381001 51.836899
radar3_radar_name=Herwijnen
radar3_radar_operational=1
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 765.0)
Upper Right ( 700.0, 0.0)
Lower Right ( 700.0, 765.0)
Center ( 350.0, 382.5)
Band 1 Block=700x765 Type=Byte, ColorInterp=Undefined
Metadata:
image1_image_data_CLASS=IMAGE
image1_image_data_PALETTE=
image1_image_data_VERSION=1.2
gdalwarp -s_srs "+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378.14 +b=6356.75 +x_0=0 y_0=0" -t_srs "epsg:28992" "HDF5:\"RAD_NL25_PCP_NA_202010271205.h5\"://image1/image_data" output.tif
which results in this error message:
Processing HDF5:"RAD_NL25_PCP_NA_202010271205.h5"://image1/image_data [1/1] : 0ERROR 1: The transformation is already "north up" or a transformation between pixel/line and georeferenced coordinates cannot be computed for HDF5:"RAD_NL25_PCP_NA_202010271205.h5"://image1/image_data. There is no affine transformation and no GCPs. Specify transformation option SRC_METHOD=NO_GEOTRANSFORM to bypass this check.
What am i missing? If i set the flag SRC_METHOD=NO_GEOTRANSFORM i dont get the expected result
Georeference support for HDF5 data in GDAL is very limited (https://gdal.org/drivers/raster/hdf5.html). Therefore, your HDF5 file is not recognized by GDAL as georeferenced data.
My solution is to divide your command into two steps:
gdal_translategdalwarpFirst, the definition of SRS, the size of the Earth should be expressed in m as follows.
+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378140 +b=6356750 +x_0=0 +y_0=0
Next, assuming that the metadata geographic_geo_product_corners represents the latitude and longitude of the four corners of the image, we find the projected coordinates of the corners of the image.
LL (0, -4415002.84084825)
UL (0, -3649999.11191775)
UR (700002.437056242, -3649999.05174429)
LR (700002.440031711, -4415003.15918867)
I used gdaltransform to find this.
gdaltransform -s_srs "+proj=latlong" -t_srs "+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378140 +b=6356750 +x_0=0 y_0=0"
So, the conversion in your question can be done with the following command
gdal_translate -of VRT -a_srs "+proj=stere +lat_0=90 +lon_0=0 +lat_ts=60 +a=6378140 +b=6356750 +x_0=0 +y_0=0" -a_ullr 0 -3649999.05174429 700002.440031711 -4415003.15918867 "HDF5:\"RAD_NL25_PCP_NA_202010271205.h5\"://image1/image_data" /vsistdout/ | gdalwarp -of GTiff -t_srs epsg:28992 /vsistdin/ output.tif
For information on how to combine two gdal command with a pipe, see the answer in How to convert projection of png tile from epsg:4326 to epsg:3857 by one command using gdal.