[Gdal-dev] gdalwarp doesn't work on lcc

[Fu Chen]

Frank,

Yeah, if the warped.tif is already there, the gdalwarp will fail. All troubles are solved, if I try another name or delete the old one :)


----- Original Message ----- 
From: "Frank Warmerdam" <warmerdam at pobox.com>
To: <gdal-dev at remotesensing.org>
Sent: Friday, October 31, 2003 11:32 PM
Subject: Re: [Gdal-dev] gdalwarp doesn't work on lcc


> Fu Chen wrote:
> > Hi!
> > GdalWarp doesn't work when i try to convert a image into lcc project.
> 
> 
> Fu Chen,
> 
> I made a quick effort to reproduce this problem and things seemed to work
> ok for me. I created a file intended to be similar to your source file in
> coordinate system at least:
> 
> warmerda at gdal2200[17]% gdalinfo chen.tif
> Driver: GTiff/GeoTIFF
> Size is 512, 512
> Coordinate System is:
> PROJCS["WGS 84 / UTM zone 51N",
>     GEOGCS["WGS 84",
>         DATUM["WGS_1984",
>             SPHEROID["WGS 84",6378137,298.2572235629972,
>                 AUTHORITY["EPSG","7030"]],
>             AUTHORITY["EPSG","6326"]],
>         PRIMEM["Greenwich",0],
>         UNIT["degree",0.0174532925199433],
>         AUTHORITY["EPSG","4326"]],
>     PROJECTION["Transverse_Mercator"],
>     PARAMETER["latitude_of_origin",0],
>     PARAMETER["central_meridian",123],
>     PARAMETER["scale_factor",0.9996],
>     PARAMETER["false_easting",500000],
>     PARAMETER["false_northing",0],
>     UNIT["metre",1,
>         AUTHORITY["EPSG","9001"]],
>     AUTHORITY["EPSG","32651"]]
> Origin = (440720.000000,3751320.000000)
> Pixel Size = (60.000000,-60.000000)
> Corner Coordinates:
> Upper Left  (  440720.000, 3751320.000) (122d21'31.79"E, 33d54'2.17"N)
> Lower Left  (  440720.000, 3720600.000) (122d21'39.20"E, 33d37'24.77"N)
> Upper Right (  471440.000, 3751320.000) (122d41'27.92"E, 33d54'6.78"N)
> Lower Right (  471440.000, 3720600.000) (122d41'31.50"E, 33d37'29.33"N)
> Center      (  456080.000, 3735960.000) (122d31'32.60"E, 33d45'46.17"N)
> Band 1 Block=512x16 Type=Byte, ColorInterp=Gray
> 
> Then ran:
> 
>  gdalwarp -t_srs "+proj=lcc +lon_0=110 +lat_0=10 +lat_1=25 +lat_2=47 +datum=WGS84" chen.tif warped.tif
> 
> Producing:
> 
> warmerda at gdal2200[18]% gdalinfo warped.tif
> Driver: GTiff/GeoTIFF
> Size is 576, 576
> Coordinate System is:
> PROJCS["unnamed",
>     GEOGCS["WGS 84",
>         DATUM["WGS_1984",
>             SPHEROID["WGS 84",6378137,298.2572235629972,
>                 AUTHORITY["EPSG","7030"]],
>             AUTHORITY["EPSG","6326"]],
>         PRIMEM["Greenwich",0],
>         UNIT["degree",0.0174532925199433],
>         AUTHORITY["EPSG","4326"]],
>     PROJECTION["Lambert_Conformal_Conic_2SP"],
>     PARAMETER["standard_parallel_1",25],
>     PARAMETER["standard_parallel_2",47],
>     PARAMETER["latitude_of_origin",10],
>     PARAMETER["central_meridian",110],
>     PARAMETER["false_easting",0],
>     PARAMETER["false_northing",0],
>     UNIT["metre",1,
>         AUTHORITY["EPSG","9001"]]]
> Origin = (1120036.822687,2770670.127441)
> Pixel Size = (58.977562,-58.977562)
> Corner Coordinates:
> Upper Left  ( 1120036.823, 2770670.127) (122d21'52.12"E, 33d56'14.27"N)
> Lower Left  ( 1120036.823, 2736699.052) (122d19'1.37"E, 33d37'41.24"N)
> Upper Right ( 1154007.898, 2770670.127) (122d44'6.91"E, 33d53'49.28"N)
> Lower Right ( 1154007.898, 2736699.052) (122d41'11.15"E, 33d35'16.83"N)
> Center      ( 1137022.361, 2753684.590) (122d31'32.89"E, 33d45'45.92"N)
> Band 1 Block=576x14 Type=Byte, ColorInterp=Gray
> 
> One interesting thing in your case was that the output file did *not* seem
> to have WGS84 as the GEOGCS/DATUM/ELLIPSOID.  That suggests there was some
> sort of problem parsing the LCC projection definition properly but I didn't
> seem to run into that.
> 
> Any chance the output file warped.tif already existed?  I remember some
> discussion of that as an issue in recent days, but I didn't dig into it
> at the time.
> 
> If the problem persists for you, I would appreciate your:
> 
>  o Verifying the problem with the latest GDAL from CVS.
>  o Submitting a bug report in bugzilla including a small input
>    file I can use.
> 
> Best regards,
> -- 
> ---------------------------------------+--------------------------------------
> I set the clouds in motion - turn up   | Frank Warmerdam, warmerdam at pobox.com
> light and sound - activate the windows | http://pobox.com/~warmerdam
> and watch the world go round - Rush    | Geospatial Programmer for Rent
> 
> 
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