[gdal-dev] Converting from Lambert (LCC) to latlong/mercator

[Joaquim Luis]

Brian,

The left side of your image contains a ... legend, so it's not part of the
map. How can any program guess what is legend and where the map starts?

Joaquim Luis

> I am still battleing this conversion. I was just informed, via IRC,
> that gdal won't overwrite existing files, so I may have been making a
> difference, but not knowing it. In any case, I tossed together a
> simple script, that thus far, does nothing...
> 
> #!/bin/sh
> 
> rm -rf nn.tif n-merc.tif
> 
> echo '*** Translate ***'
> gdal_translate n.tif nn.tif -of gtiff -CO TFW=YES -mo
> TIFFTAG_XRESOLUTION= -mo TIFFTAG_YRESOLUTION= -a_ullr -115d0 56d0
> -105d0 54d0 -a_srs "+proj=lcc +lat_0=54 +lon_0=-115 +lat_1=49.33
> +lat_2=54.66 +x_0=0 +y_0=0 +datum=NAD27 +ellps=clrk80"
> 
> echo '***   Warp    ***'
> gdalwarp -t_srs "+proj=merc +datum=WGS84" nn.tif n-merc.tif
> 
> open n-merc.tif
> 
> 
> I have also posted the source file I am working with, albeit scaled
> down and converted so its not 140mb.
> 
> http://game-sat.com/~brian/north.png
> 
> What concerns me is what gdalinfo gives me for the intermediate step,
> as the georeferenced coordinates are dead wrong. If I remove the a_srs
> to assign it as being an actual lambert conformal projection, it
> doesn't even have the georeferenced options, just the first ones.
> 
> $ gdalinfo nn.tif
> Driver: GTiff/GeoTIFF
> Files: nn.tif
> Size is 11696, 4208
> Coordinate System is:
> PROJCS["unnamed",
>     GEOGCS["NAD27",
>         DATUM["North_American_Datum_1927",
>             SPHEROID["Clarke 1866",6378206.4,294.9786982139006,
>                 AUTHORITY["EPSG","7008"]],
>             AUTHORITY["EPSG","6267"]],
>         PRIMEM["Greenwich",0],
>         UNIT["degree",0.0174532925199433],
>         AUTHORITY["EPSG","4267"]],
>     PROJECTION["Lambert_Conformal_Conic_2SP"],
>     PARAMETER["standard_parallel_1",49.33],
>     PARAMETER["standard_parallel_2",54.66],
>     PARAMETER["latitude_of_origin",54],
>     PARAMETER["central_meridian",-115],
>     PARAMETER["false_easting",0],
>     PARAMETER["false_northing",0],
>     UNIT["metre",1,
>         AUTHORITY["EPSG","9001"]]]
> Origin = (-115.000000000000000,56.000000000000000)
> Pixel Size = (0.000854993160055,-0.000475285171103)
> Metadata:
>   AREA_OR_POINT=Area
>   TIFFTAG_SOFTWARE=Adobe Photoshop CS3 Macintosh
>   TIFFTAG_DATETIME=2009:02:21 16:15:49
>   TIFFTAG_XRESOLUTION=0
>   TIFFTAG_YRESOLUTION=0
>   TIFFTAG_RESOLUTIONUNIT=2 (pixels/inch)
> Image Structure Metadata:
>   INTERLEAVE=PIXEL
> Corner Coordinates:
> Upper Left  (-115.0000000,  56.0000000) (115d 0'6.32"W, 54d 0'1.81"N)
> Lower Left  (-115.0000000,  54.0000000) (115d 0'6.32"W, 54d 0'1.75"N)
> Upper Right (-105.0000000,  56.0000000) (115d 0'5.77"W, 54d 0'1.81"N)
> Lower Right (-105.0000000,  54.0000000) (115d 0'5.77"W, 54d 0'1.75"N)
> Center      (-110.0000000,  55.0000000) (115d 0'6.04"W, 54d 0'1.78"N)
> Band 1 Block=11696x1 Type=Byte, ColorInterp=Red
> Band 2 Block=11696x1 Type=Byte, ColorInterp=Green
> Band 3 Block=11696x1 Type=Byte, ColorInterp=Blue
> 
> 
> On Sat, Feb 21, 2009 at 9:55 PM, Brian Murray <idlegod at gmail.com> wrote:
>> I'm trying to get all of it. :)
>>
>> It appears like a_allr is ok, but then when I apply the definition, it
>> only grabs a few meters of the real map...
>>
>> I think I must have to set the scale to something. I just don't know
>> what yet... I am going to sleep on it. I found some sites that have
>> some calculations for that now.
>>
>> On Sat, Feb 21, 2009 at 9:47 PM, Wendy Fay Stevenson <stevensw at erau.edu> wrote:
>>> Um, it looks like it's doing what you're asking it to do.
>>> What corner points are you wanting?
>>>
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