[gdal-dev] map info and projections from GeoTIFF file to create ENVI header
Nevzat Guler
nguler at jlab.org
Sun Jan 17 09:15:30 PST 2016
Thank you Dmitry,
What is the best way to extract the information we got using gdalinfo.exe by using GDAL classes, within a C++ code? As I mentioned, I am using GetGeoTransform and GetProjectionRef() but the results miss many of the information (specifically the map info elements as I explained in the previous email).
On another note, I actually get a different output from gdalinfo.exe using my file (please see the printed result below). I got the geotiff file from my colleague. When I open the file with ENVI, I get all the information, including GEOGCS information.
Can it be that my file is just corrupted and that's why I don't get all the information from GetGeoTransform and GetProjectionRef()? But then how would ENVI is able to extract this information if it were not in the file?
Thanks again, - Nevzat
C:\Cubes\Landsat\LC80080472013174LGN00>gdalinfo LC80080472013174LGN00_B1.TIF
Driver: GTiff/GeoTIFF
Files: LC80080472013174LGN00_B1.TIF
.\LC80080472013174LGN00_MTL.txt
Size is 7571, 7411
Coordinate System is:
PROJCS["unnamed",
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",-69],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]]]
Origin = (145185.000000000000000,2189715.000000000000000)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
AREA_OR_POINT=Point
METADATATYPE=ODL
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 145185.000, 2189715.000)
Lower Left ( 145185.000, 1967385.000)
Upper Right ( 372315.000, 2189715.000)
Lower Right ( 372315.000, 1967385.000)
Center ( 258750.000, 2078550.000)
Band 1 Block=7571x1 Type=UInt16, ColorInterp=Gray
-----Original Message-----
From: gdal-dev [mailto:gdal-dev-bounces at lists.osgeo.org] On Behalf Of Dmitry Baryshnikov
Sent: Sunday, January 17, 2016 6:57 AM
To: gdal-dev at lists.osgeo.org
Subject: Re: [gdal-dev] map info and projections from GeoTIFF file to create ENVI header
Hi Nevzat,
The landsat geotiff already have CRS embeded in file
$ gdalinfo LC80150362013097LGN03_B1.TIF
Driver: GTiff/GeoTIFF
Files: LC80150362013097LGN03_B1.TIF
./LC80150362013097LGN03_MTL.txt
Size is 7281, 7261
Coordinate System is:
PROJCS["WGS 84 / UTM zone 17N",
GEOGCS["WGS 84",
DATUM["WGS_1984",
SPHEROID["WGS 84",6378137,298.257223563,
AUTHORITY["EPSG","7030"]],
AUTHORITY["EPSG","6326"]],
PRIMEM["Greenwich",0,
AUTHORITY["EPSG","8901"]],
UNIT["degree",0.0174532925199433,
AUTHORITY["EPSG","9122"]],
AUTHORITY["EPSG","4326"]],
PROJECTION["Transverse_Mercator"],
PARAMETER["latitude_of_origin",0],
PARAMETER["central_meridian",-81],
PARAMETER["scale_factor",0.9996],
PARAMETER["false_easting",500000],
PARAMETER["false_northing",0],
UNIT["metre",1,
AUTHORITY["EPSG","9001"]],
AXIS["Easting",EAST],
AXIS["Northing",NORTH],
AUTHORITY["EPSG","32617"]]
Origin = (706185.000000000000000,3943515.000000000000000)
Pixel Size = (30.000000000000000,-30.000000000000000)
Metadata:
AREA_OR_POINT=Point
METADATATYPE=ODL
Image Structure Metadata:
INTERLEAVE=BAND
Corner Coordinates:
Upper Left ( 706185.000, 3943515.000) ( 78d43'24.74"W, 35d36'50.15"N) Lower Left ( 706185.000, 3725685.000) ( 78d46'35.65"W, 33d39' 3.82"N) Upper Right ( 924615.000, 3943515.000) ( 76d19' 2.05"W, 35d32'39.74"N) Lower Right ( 924615.000, 3725685.000) ( 76d25'33.46"W, 33d35'10.99"N)
Center ( 815400.000, 3834600.000) ( 77d33'38.95"W, 34d36'17.35"N)
Band 1 Block=7281x1 Type=UInt16, ColorInterp=Gray
And this is right CRS.
Where do you get you geotiff?
Best regards,
Dmitry
17.01.2016 03:41, Nevzat Guler пишет:
> Dear experts,
>
> I am reading LANDSAT GeoTIFF files and combining bands to create and
> ENVI cube.
> I am using GDAL to read the GeoTIFF file, and my own custom cube
> writer to write the ENVI style cube. Transferring the map information
> proved to be a bit convoluted. I seek your help to figure out this.
>
> My first problem is to access map info from GeoTIFF file. The map info
> includes:
>
> map info = {UTM, 1.000, 1.000, 145185.000, 2189715.000,
> 3.0000000000e+001, 3.0000000000e+001, 19, North, WGS-84, units=Meters}
>
> I am able to get the location (x,y), and pixel size (x,y) from :
> double adfGeoTransform[6];
> srcDS->GetGeoTransform(adfGeoTransform);
>
> But, I could not find any way to get the other variables in the
> string: UTM, pixel tie points, Unit and DATUM. Is there any way to get them?
>
> Finally, for the Coordinate System String, GDAL gives me:
>
> PROJCS["unnamed",PROJECTION["Transverse_Mercator"],PARAMETER["latitude
> _of_or
> igin
> ",0],PARAMETER["central_meridian",-69],PARAMETER["scale_factor",0.9996
> ],PARA
> METE
> R["false_easting",500000],PARAMETER["false_northing",0],UNIT["Meter",1
> ]]
>
> But I should actually get
>
> PROJCS["UTM_Zone_19N",GEOGCS["WGS 84",DATUM["WGS_1984",SPHEROID["WGS
> 84",6378137,298.257223563,AUTHORITY["EPSG","7030"]],TOWGS84[0,0,0,0,0,
> 0,0],A
> UTHO
> RITY["EPSG","6326"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","8901"]],UN
> IT["de
> gree
> ",0.0174532925199433,AUTHORITY["EPSG","9108"]],AUTHORITY["EPSG","4326"
> ]],PRO
> JECT
> ION["Transverse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER
> ["cent
> ral_
> meridian",-69],PARAMETER["scale_factor",0.9996],PARAMETER["false_easti
> ng",50
> 0000
> ],PARAMETER["false_northing",0],UNIT["Meter",1]]
>
> GDAL gives me PROJCS, "unnamed". And no GEOGCS information is given.
> I am able to get the coordinate system properties by using the
> following commands but I first need to set few things to use exportToWTK.
>
>>> OGRSpatialReference oSRS;
>>> char *pszWKT = NULL;
>>> oSRS.SetProjCS("UTM_Zone_19N");
>>> oSRS.SetWellKnownGeogCS("WGS84");
>>> oSRS.SetUTM(19, TRUE);
>>> oSRS.SetWellKnownGeogCS("WGS84");
>>> oSRS.exportToWkt(&pszWKT);
>>> printf("%s\n", pszWKT);
> However, this requires me to set SetProjCS, SetWellKnownGeogCS and
> SetUTM first. I don't know these before I read the file. Is there any
> way to get them from the file so that I don't need prior knowledge to
> create the header. When I pull the GeoTIFF file into ENVI, all these
> information is already there. If this list is only or development
> purposes, please let me know if there is any other email list that can
> give me guidance on this quest.
>
> I appreciate your help and suggestions.
> Best regards,
> - Nevzat
>
> _______________________________________________
> gdal-dev mailing list
> gdal-dev at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/gdal-dev
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