Python 将geotiff转换为netcdf时，值会更改

我有一个geotiff，它的值从0到200，nodata的值是255。 我用python中的gdal将其转换为netcdf：

ds = gdal.Translate(outputfile, inputfile, format='NetCDF')

[根据Val的建议，我尝试添加

outputType=gdal.gdalconst.GDT_字节，noData=255

，但也没有解决这一问题]

现在netcdf中的所有0和nodata值都是0。但主要的问题是其他值现在在127到-128之间。tif的最高值现在是最低值（即负值），最低值现在是最高正值

下面是来自数据层上的netcdf的信息

<class 'netCDF4._netCDF4.Variable'>
int8 Band1(y, x)
    long_name: GDAL Band Number 1
    _Unsigned: true
    valid_range: [  0 255]
    _FillValue: 0
    grid_mapping: polar_stereographic
unlimited dimensions: 
current shape = (752, 752)
filling on

以及转换后的Tif的gdal.Info（在答案中添加Val的建议后）

Tif文件：

---

转换后的nc文件：

看起来您正在将输入数据强制转换为

uint8

，因此高于数据类型最大“溢出”的值将被转换为负值。您需要专门将数据类型设置为

Byte

（在

gdal

行话中是

uint8

）

您可以通过添加

outputType

option关键字参数来解决此问题。此外，您可以使用

nodata

选项设置所需的nodata值

以下是具有正确数据类型和255节点数据值的完整调用：

gdal.Translate（输出文件，
输入文件，
format='NetCDF'，
输出类型=gdal.gdalconst.GDT_字节，
noData=255）

谢谢，但不幸的是，这并没有解决问题。@Beardley您需要添加一些关于您的问题的更多信息，例如

gdalinfo

输出，用于

tif

和

nc

文件。下载链接通常不可用。谢谢，我已经添加了gdal.Info输出。您的tif的数据类型似乎正确。。。它的颜色映射一直到255。能否添加

gdalinfo-hist

和/或

gdalinfo-stats

？

Driver: netCDF/Network Common Data Format
Files: /Users/clip_asi-AMSR2-s3125-20200305-v5.4.nc
Size is 117, 163
Coordinate System is:
PROJCRS["IDL GeoTIFF Suport
Projection = Polar Stereographic
True scale:      -70.0000deg
Gunnar Spreen, Apr 2004",
    BASEGEOGCRS["WGS 84",
        DATUM["World Geodetic System 1984",
            ELLIPSOID["WGS 84",6378137,298.257223563,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4326]],
    CONVERSION["unnamed",
        METHOD["Polar Stereographic (variant B)",
            ID["EPSG",9829]],
        PARAMETER["Latitude of standard parallel",-70,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8832]],
        PARAMETER["Longitude of origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8833]],
        PARAMETER["False easting",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["easting",north,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["northing",north,
            ORDER[2],
            LENGTHUNIT["metre",1]]]
Data axis to CRS axis mapping: 1,2
Origin = (-1810937.500000000000000,-554687.500000000000000)
Pixel Size = (3125.000000000000000,-3125.000000000000000)
Metadata:
  Band1#grid_mapping=polar_stereographic
  Band1#long_name=GDAL Band Number 1
  Band1#valid_range={0,255}
  Band1#_FillValue=-1
  Band1#_Unsigned=true
  NC_GLOBAL#Conventions=CF-1.5
  NC_GLOBAL#GDAL=GDAL 3.0.2, released 2019/10/28
  NC_GLOBAL#GDAL_AREA_OR_POINT=Area
  NC_GLOBAL#GDAL_TIFFTAG_DATETIME=2020:03:06 05:10:59
  NC_GLOBAL#GDAL_TIFFTAG_DOCUMENTNAME=/ssmi/www/htdocs/data/amsr2/asi_daygrid_swath/s3125/2020/mar/Amundsen/asi-AMSR2-s3125-20200305-v5.4.tif
  NC_GLOBAL#GDAL_TIFFTAG_IMAGEDESCRIPTION=IDL TIFF file
  NC_GLOBAL#GDAL_TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
  NC_GLOBAL#GDAL_TIFFTAG_SOFTWARE=IDL 8.1, ITT Visual Information Solutions
  NC_GLOBAL#GDAL_TIFFTAG_XRESOLUTION=100
  NC_GLOBAL#GDAL_TIFFTAG_YRESOLUTION=100
  NC_GLOBAL#history=Wed Mar 31 18:36:11 2021: GDAL CreateCopy( /Users/gjmacdonald/Downloads/clip_asi-AMSR2-s3125-20200305-v5.4.nc, ... )
  polar_stereographic#false_easting=0
  polar_stereographic#false_northing=0
  polar_stereographic#GeoTransform=-1810937.5 3125 0 -554687.5 0 -3125 
  polar_stereographic#grid_mapping_name=polar_stereographic
  polar_stereographic#inverse_flattening=298.257223563
  polar_stereographic#latitude_of_projection_origin=-90
  polar_stereographic#longitude_of_prime_meridian=0
  polar_stereographic#long_name=CRS definition
  polar_stereographic#semi_major_axis=6378137
  polar_stereographic#spatial_ref=PROJCS["IDL GeoTIFF Suport
Projection = Polar Stereographic
True scale:      -70.0000deg
Gunnar Spreen, Apr 2004",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],AUTHORITY["EPSG","6326"]],PRIMEM["Greenwich",0],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9122"]],AUTHORITY["EPSG","4326"]],PROJECTION["Polar_Stereographic"],PARAMETER["latitude_of_origin",-70],PARAMETER["central_meridian",0],PARAMETER["false_easting",0],PARAMETER["false_northing",0],UNIT["metre",1],AXIS["Easting",NORTH],AXIS["Northing",NORTH]]
  polar_stereographic#standard_parallel=-70
  polar_stereographic#straight_vertical_longitude_from_pole=0
  x#long_name=x coordinate of projection
  x#standard_name=projection_x_coordinate
  x#units=m
  y#long_name=y coordinate of projection
  y#standard_name=projection_y_coordinate
  y#units=m
Corner Coordinates:
Upper Left  (-1810937.500, -554687.500) (107d 1'47.10"W, 72d38'40.82"S)
Lower Left  (-1810937.500,-1064062.500) (120d26'14.82"W, 70d47' 7.34"S)
Upper Right (-1445312.500, -554687.500) (110d59'45.57"W, 75d46'46.47"S)
Lower Right (-1445312.500,-1064062.500) (126d21'39.97"W, 73d32'29.83"S)
Center      (-1628125.000, -809375.000) (116d25'58.56"W, 73d19'46.09"S)
Band 1 Block=117x1 Type=Byte, ColorInterp=Undefined
  NoData Value=255
  Metadata:
    grid_mapping=polar_stereographic
    long_name=GDAL Band Number 1
    NETCDF_VARNAME=Band1
    valid_range={0,255}
    _FillValue=-1
    _Unsigned=true

Driver: GTiff/GeoTIFF
Files: /Users/clip_asi-AMSR2-s3125-20200305-v5.4.tif
Size is 117, 163
Coordinate System is:
PROJCRS["IDL GeoTIFF Suport
Projection = Polar Stereographic
True scale:      -70.0000deg
Gunnar Spreen, Apr 2004",
    BASEGEOGCRS["WGS 84",
        DATUM["World Geodetic System 1984",
            ELLIPSOID["WGS 84",6378137,298.257223563,
                LENGTHUNIT["metre",1]]],
        PRIMEM["Greenwich",0,
            ANGLEUNIT["degree",0.0174532925199433]],
        ID["EPSG",4326]],
    CONVERSION["unnamed",
        METHOD["Polar Stereographic (variant B)",
            ID["EPSG",9829]],
        PARAMETER["Latitude of standard parallel",-70,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8832]],
        PARAMETER["Longitude of origin",0,
            ANGLEUNIT["degree",0.0174532925199433],
            ID["EPSG",8833]],
        PARAMETER["False easting",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8806]],
        PARAMETER["False northing",0,
            LENGTHUNIT["metre",1],
            ID["EPSG",8807]]],
    CS[Cartesian,2],
        AXIS["easting",north,
            ORDER[1],
            LENGTHUNIT["metre",1]],
        AXIS["northing",north,
            ORDER[2],
            LENGTHUNIT["metre",1]]]
Data axis to CRS axis mapping: 1,2
Origin = (-1810937.500000000000000,-554687.500000000000000)
Pixel Size = (3125.000000000000000,-3125.000000000000000)
Metadata:
  AREA_OR_POINT=Area
  TIFFTAG_DATETIME=2020:03:06 05:10:59
  TIFFTAG_DOCUMENTNAME=/ssmi/www/htdocs/data/amsr2/asi_daygrid_swath/s3125/2020/mar/Amundsen/asi-AMSR2-s3125-20200305-v5.4.tif
  TIFFTAG_IMAGEDESCRIPTION=IDL TIFF file
  TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
  TIFFTAG_SOFTWARE=IDL 8.1, ITT Visual Information Solutions
  TIFFTAG_XRESOLUTION=100
  TIFFTAG_YRESOLUTION=100
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (-1810937.500, -554687.500) (107d 1'47.10"W, 72d38'40.82"S)
Lower Left  (-1810937.500,-1064062.500) (120d26'14.82"W, 70d47' 7.34"S)
Upper Right (-1445312.500, -554687.500) (110d59'45.57"W, 75d46'46.47"S)
Lower Right (-1445312.500,-1064062.500) (126d21'39.97"W, 73d32'29.83"S)
Center      (-1628125.000, -809375.000) (116d25'58.56"W, 73d19'46.09"S)
Band 1 Block=117x70 Type=Byte, ColorInterp=Palette
  NoData Value=255
  Color Table (RGB with 256 entries)
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