Saya mencoba untuk memetakan dari Geostationary ke Lambert sesuai dengan menggunakan gdalwarp. Data input saya di netcdf, dan dalam koordinat geografis (derajat) dan saya ingin menampilkan data yang dipetakan ke netcdf. Saya telah membuat file vrt yang sesuai untuk input data netcdf. Gdalwarp akan menampilkan file netcdf, tetapi data output semuanya nol dan saya menerima kesalahan berikut:
Creating output file that is 5120P x 5120L.
Processing input file netcdf.vrt.
ERROR 1: Too many points (441 out of 441) failed to transform,
unable to compute output bounds.
Warning 1: Unable to compute source region for output window 0,0,5120,5120, skipping.
0...10...20...30...40...50...60...70...80...90...100 - done.
Saya mencoba perintah berikut:
/usr/bin/gdalwarp -s_srs "+proj=geos +h=35785831 +lon_0=-75 +x_0=-0.151844 +y_0=0.151844 +a=6378140 +b=6356754.99999591 +units=degrees +no_defs" -t_srs "+proj=lcc +ellps=clrk66 +a=6378137 +b=6378137 +e=0.0818191910435 +lat_0=24.9999 +lon_0=-95 +lat_1=24.9999 +lat_ts=25.0001 +units=meters +no_defs" -te -1952976.3246 -828316.5944 3248431.6754 4373091.4056 -of netCDF -geoloc -overwrite -r bilinear -ts 5120 5120 netcdf.vrt out.nc
Bisakah gdalwarp memetakan kembali dari koordinat geografis ke proyeksi? Atau apakah saya perlu menerjemahkan geografi ke proyeksi terlebih dahulu? Juga, dapatkah gdalwarp membaca informasi proyeksi langsung dari netcdf atau Anda PERLU menulis ke .vrt terlebih dahulu?
Inilah yang keluaran gdalinfo dari file input: (ini adalah file GOES 13 dari CLASS)
Size is 512, 512
Coordinate System is `'
Metadata:
NC_GLOBAL#Conventions=CF-1.4
NC_GLOBAL#Satellite Sensor=G-13 IMG
NC_GLOBAL#Source=McIDAS Area File
Subdatasets:
SUBDATASET_1_NAME=NETCDF:"goes13.2013.100.165517.BAND_04.nc":auditTrail
SUBDATASET_1_DESC=[3x80] auditTrail (8-bit character)
SUBDATASET_2_NAME=NETCDF:"goes13.2013.100.165517.BAND_04.nc":data
SUBDATASET_2_DESC=[1x665x2036] data (32-bit floating-point)
SUBDATASET_3_NAME=NETCDF:"goes13.2013.100.165517.BAND_04.nc":lat
SUBDATASET_3_DESC=[665x2036] lat (32-bit floating-point)
SUBDATASET_4_NAME=NETCDF:"goes13.2013.100.165517.BAND_04.nc":lon
SUBDATASET_4_DESC=[665x2036] lon (32-bit floating-point)
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 512.0)
Upper Right ( 512.0, 0.0)
Lower Right ( 512.0, 512.0)
Center ( 256.0, 256.0)
Dan info gdal tambahan pada variabel data:
Driver: netCDF/Network Common Data Format
Files: goes13.2013.100.174518.BAND_04.nc
Size is 2036, 665
Coordinate System is `'
Metadata:
data#coordinates=lon lat
data#long_name=0-255 Brightness Temperature
data#type=VISR
NC_GLOBAL#Conventions=CF-1.4
NC_GLOBAL#Satellite Sensor=G-13 IMG
NC_GLOBAL#Source=McIDAS Area File
NETCDF_DIM_EXTRA={time}
NETCDF_DIM_time_DEF={1,4}
NETCDF_DIM_time_VALUES=1365615900
time#long_name=seconds since 1970-1-1 0:0:0
time#units=seconds since 1970-1-1 0:0:0
Geolocation:
LINE_OFFSET=0
LINE_STEP=1
PIXEL_OFFSET=0
PIXEL_STEP=1
SRS=GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,0,0],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"]]
X_BAND=1
X_DATASET=NETCDF:"goes13.2013.100.174518.BAND_04.nc":lon
Y_BAND=1
Y_DATASET=NETCDF:"goes13.2013.100.174518.BAND_04.nc":lat
Corner Coordinates:
Upper Left ( 0.0, 0.0)
Lower Left ( 0.0, 665.0)
Upper Right ( 2036.0, 0.0)
Lower Right ( 2036.0, 665.0)
Center ( 1018.0, 332.5)
Band 1 Block=2036x1 Type=Float32, ColorInterp=Undefined
NoData Value=9.96920996838686905e+36
Metadata:
coordinates=lon lat
long_name=0-255 Brightness Temperature
NETCDF_DIM_time=1365615900
NETCDF_VARNAME=data
type=VISR
Bantuan apa pun akan sangat dihargai!