Mengonversi file NetCDF ke GeoTIFF menggunakan GDAL?


10

Saya memiliki file NetCDF yang berisi data jumlah hari hujan di Inggris. Saya ingin mengonversinya menjadi GeoTIFF, tetapi tidak dapat membuat GDAL dengan benar georeferensi itu. Lihat kesedihan dari gdalinfo di bawah ini.

Saya ingin TIFF band tunggal yang menunjukkan variabel "raindays_tmean_abs". Variabel "lat" dan "lon" tampaknya memiliki nilai min / max yang masuk akal untuk menempatkan data di Inggris, tetapi ketika saya mengonversinya dengan gdal_translate, ia berakhir di lepas pantai barat Afrika.

Ada peringatan tentang dimensi pertama yang bukan dimensi "Waktu atau Vertikal". Saya membaca bahwa gdal mengharapkan data dalam urutan tertentu, jadi mungkin ini masalahnya, tapi saya tidak tahu bagaimana memodifikasinya.

Bagaimana saya mengonversi / memproyeksikan ulang data ini?

gdalinfo NETCDF: RainDays1_1961-1990_LTA_25km.nc

Warning 1: dimension #0 (meaning_period) is not a Time or Vertical dimension.
Driver: netCDF/Network Common Data Format
Files: RainDays1_1961-1990_LTA_25km.nc
       RainDays1_1961-1990_LTA_25km.nc.aux.xml
Size is 39, 52
Coordinate System is `'
Origin = (-17.650008352179277,11.329999312758446)
Pixel Size = (0.219999614514803,-0.219999998807907)
Metadata:
  axis_0#units=
  meaning_period#comment=Meaning periods are all months (12) beginning January, all seasons (4) beginning Winter (DJF) and Annual (1)
  meaning_period#long_name=meaning_period
  meaning_period#units=
  NC_GLOBAL#Conventions=CF-1.0
  NETCDF_DIM_EXTRA={meaning_period}
  NETCDF_DIM_meaning_period_DEF={17,6}
  NETCDF_DIM_meaning_period_VALUES={0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16}
  raindays_tmean_abs#comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
  raindays_tmean_abs#coordinates=lon lat
  raindays_tmean_abs#long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
  raindays_tmean_abs#missing_value=1e+020
  raindays_tmean_abs#name=rain_days
  raindays_tmean_abs#title=rain_days
  raindays_tmean_abs#units=days
  rlat#axis=Y
  rlat#bounds=bounds_rlat
  rlat#long_name=latitude in rotated pole grid
  rlat#standard_name=grid_latitude
  rlat#units=degrees
  rlon#axis=X
  rlon#bounds=bounds_rlon
  rlon#long_name=longitude in rotated pole grid
  rlon#modulo=360
  rlon#standard_name=grid_longitude
  rlon#topology=circular
  rlon#units=degrees
Subdatasets:
  SUBDATASET_1_NAME=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":bounds_rlat
  SUBDATASET_1_DESC=[52x2] bounds_rlat (64-bit floating-point)
  SUBDATASET_2_NAME=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":bounds_rlon
  SUBDATASET_2_DESC=[39x2] bounds_rlon (64-bit floating-point)
  SUBDATASET_3_NAME=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":lat
  SUBDATASET_3_DESC=[52x39] latitude (32-bit floating-point)
  SUBDATASET_4_NAME=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":lon
  SUBDATASET_4_DESC=[52x39] longitude (32-bit floating-point)
  SUBDATASET_5_NAME=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":raindays_tmean_abs
  SUBDATASET_5_DESC=[17x52x39] raindays_tmean_abs (32-bit floating-point)
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:"RainDays1_1961-1990_LTA_25km.nc":lon
  Y_BAND=1
  Y_DATASET=NETCDF:"RainDays1_1961-1990_LTA_25km.nc":lat
Corner Coordinates:
Upper Left  ( -17.6500084,  11.3299993) 
Lower Left  ( -17.6500084,  -0.1100006) 
Upper Right (  -9.0700234,  11.3299993) 
Lower Right (  -9.0700234,  -0.1100006) 
Center      ( -13.3600159,   5.6099993) 
Band 1 Block=39x1 Type=Float32, ColorInterp=Undefined
  Min=10.658 Max=22.949 
  Minimum=10.658, Maximum=22.949, Mean=15.625, StdDev=3.151
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=0
    NETCDF_VARNAME=raindays_tmean_abs
    STATISTICS_MAXIMUM=22.949373245239
    STATISTICS_MEAN=15.624619410087
    STATISTICS_MINIMUM=10.657625198364
    STATISTICS_STDDEV=3.1508820627895
    title=rain_days
    units=days
Band 2 Block=39x1 Type=Float32, ColorInterp=Undefined
  Min=7.893 Max=17.172 
  Minimum=7.893, Maximum=17.172, Mean=11.591, StdDev=2.282
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=1
    NETCDF_VARNAME=raindays_tmean_abs
    STATISTICS_MAXIMUM=17.172254562378
    STATISTICS_MEAN=11.591275386767
    STATISTICS_MINIMUM=7.8926663398743
    STATISTICS_STDDEV=2.28225356537
    title=rain_days
    units=days
Band 3 Block=39x1 Type=Float32, ColorInterp=Undefined
  Min=9.700 Max=21.762 
  Minimum=9.700, Maximum=21.762, Mean=13.882, StdDev=2.988
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=2
    NETCDF_VARNAME=raindays_tmean_abs
    STATISTICS_MAXIMUM=21.761842727661
    STATISTICS_MEAN=13.88236379732
    STATISTICS_MINIMUM=9.7001943588257
    STATISTICS_STDDEV=2.9875935432638
    title=rain_days
    units=days
Band 4 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=3
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 5 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=4
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 6 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=5
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 7 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=6
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 8 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=7
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 9 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=8
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 10 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=9
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 11 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=10
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 12 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=11
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 13 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=12
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 14 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=13
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 15 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=14
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 16 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=15
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days
Band 17 Block=39x1 Type=Float32, ColorInterp=Undefined
  NoData Value=1.0000000200408773e+020
  Metadata:
    comment=Converted from UKCP09 monthly data to climatologies and then averaged to 25km rotated pole grid.
    coordinates=lon lat
    long_name=Number of days per meaning period having a rainfall >= 1 mm (days)
    missing_value=1e+020
    name=rain_days
    NETCDF_DIM_meaning_period=16
    NETCDF_VARNAME=raindays_tmean_abs
    title=rain_days
    units=days

gdalinfo NETCDF: RainDays1_1961-1990_LTA_25km.nc: lon

Driver: netCDF/Network Common Data Format
Files: RainDays1_1961-1990_LTA_25km.nc
       RainDays1_1961-1990_LTA_25km.nc.aux.xml
Size is 39, 52
Coordinate System is `'
Origin = (-17.650008352179277,11.329999312758446)
Pixel Size = (0.219999614514803,-0.219999998807907)
Metadata:
  axis_0#units=
  lon#long_name=longitude
  lon#missing_value=1e+020
  lon#name=lon
  lon#standard_name=longitude
  lon#units=degrees_east
  meaning_period#comment=Meaning periods are all months (12) beginning January, all seasons (4) beginning Winter (DJF) and Annual (1)
  meaning_period#long_name=meaning_period
  meaning_period#units=
  NC_GLOBAL#Conventions=CF-1.0
  rlat#axis=Y
  rlat#bounds=bounds_rlat
  rlat#long_name=latitude in rotated pole grid
  rlat#standard_name=grid_latitude
  rlat#units=degrees
  rlon#axis=X
  rlon#bounds=bounds_rlon
  rlon#long_name=longitude in rotated pole grid
  rlon#modulo=360
  rlon#standard_name=grid_longitude
  rlon#topology=circular
  rlon#units=degrees
Corner Coordinates:
Upper Left  ( -17.6500084,  11.3299993) 
Lower Left  ( -17.6500084,  -0.1100006) 
Upper Right (  -9.0700234,  11.3299993) 
Lower Right (  -9.0700234,  -0.1100006) 
Center      ( -13.3600159,   5.6099993) 
Band 1 Block=39x1 Type=Float32, ColorInterp=Undefined
  Min=-15.830 Max=3.672 
  Minimum=-15.830, Maximum=3.672, Mean=-5.246, StdDev=4.393
  NoData Value=1.0000000200408773e+020
  Metadata:
    long_name=longitude
    missing_value=1e+020
    name=lon
    NETCDF_VARNAME=lon
    standard_name=longitude
    STATISTICS_MAXIMUM=3.671746969223
    STATISTICS_MEAN=-5.2457962955782
    STATISTICS_MINIMUM=-15.830010414124
    STATISTICS_STDDEV=4.3927366732513
    units=degrees_east

gdalinfo NETCDF: RainDays1_1961-1990_LTA_25km.nc: lat

Driver: netCDF/Network Common Data Format
Files: RainDays1_1961-1990_LTA_25km.nc
       RainDays1_1961-1990_LTA_25km.nc.aux.xml
Size is 39, 52
Coordinate System is `'
Origin = (-17.650008352179277,11.329999312758446)
Pixel Size = (0.219999614514803,-0.219999998807907)
Metadata:
  axis_0#units=
  lat#long_name=latitude
  lat#missing_value=1e+020
  lat#name=lat
  lat#standard_name=latitude
  lat#units=degrees_north
  meaning_period#comment=Meaning periods are all months (12) beginning January, all seasons (4) beginning Winter (DJF) and Annual (1)
  meaning_period#long_name=meaning_period
  meaning_period#units=
  NC_GLOBAL#Conventions=CF-1.0
  rlat#axis=Y
  rlat#bounds=bounds_rlat
  rlat#long_name=latitude in rotated pole grid
  rlat#standard_name=grid_latitude
  rlat#units=degrees
  rlon#axis=X
  rlon#bounds=bounds_rlon
  rlon#long_name=longitude in rotated pole grid
  rlon#modulo=360
  rlon#standard_name=grid_longitude
  rlon#topology=circular
  rlon#units=degrees
Corner Coordinates:
Upper Left  ( -17.6500084,  11.3299993) 
Lower Left  ( -17.6500084,  -0.1100006) 
Upper Right (  -9.0700234,  11.3299993) 
Lower Right (  -9.0700234,  -0.1100006) 
Center      ( -13.3600159,   5.6099993) 
Band 1 Block=39x1 Type=Float32, ColorInterp=Undefined
  Min=47.594 Max=60.806 
  Minimum=47.594, Maximum=60.806, Mean=54.186, StdDev=3.229
  NoData Value=1.0000000200408773e+020
  Metadata:
    long_name=latitude
    missing_value=1e+020
    name=lat
    NETCDF_VARNAME=lat
    standard_name=latitude
    STATISTICS_MAXIMUM=60.805950164795
    STATISTICS_MEAN=54.185836173138
    STATISTICS_MINIMUM=47.594329833984
    STATISTICS_STDDEV=3.228754901642
    units=degrees_north

... yah sayangnya saya belum memiliki reputasi, jadi saya akan 'menjawab' alih-alih meninggalkan komentar; saya akan sangat tertarik dengan solusi gdal menggunakan windows cmd-line! saya menggunakan R untuk menyerahkan perintah gdal_translate ke cmd-line. apa yang saya coba sejauh ini adalah: `` `data_source <- 'D: /user1/01_data/input.nc' data_output <- 'D: /user1/01_data/output.tif' sistem (command = paste ('gdal_translate - dari GTiff -sds -a_srs epsg: 4326 ', data_source, data_output)) `` `ini berfungsi, tetapi saya kehilangan informasi-crs ! apakah ada yang tahu cara menyimpan informasi CRS !?
JelajahiR

Jawaban:



2

Apakah Anda mencoba mengonversinya dengan gdal_translate?

Biasanya itu harus bekerja dengan menggunakan salah satu dari dua kemungkinan:

Solusi pertama: ekstrak setiap subdataset secara manual

gdal_translate -of VRT NETCDF:"RainDays1_1961-1990_LTA_25km.nc":raindays_tmean_abs output_RD.vrt 
gdal_translate -of VRT NETCDF:"RainDays1_1961-1990_LTA_25km.nc":lat output_lat.vrt 
gdal_translate -of VRT NETCDF:"RainDays1_1961-1990_LTA_25km.nc":lon output_lon.vrt

Solusi kedua: biarkan gdal mengekstrak subdataset secara otomatis

gdal_translate -of VRT -sds RainDays1_1961-1990_LTA_25km.nc output.vrt

Solusi kedua akan mengekstrak semua subdataset ke file yang terpisah.

Mungkin perlu untuk memasukkan

-a_srs epsg:4326

bendera


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