[Gdal-dev] Fw: [GRASSLIST:8201] MrSID and incorporating the .sdw info into resulting GeoTiff.

[Hamish]

Fwd from the GRASS users' list re. gdal_translate.


Begin forwarded message:

Date: Wed, 07 Sep 2005 17:46:00 -0600
From: Craig Aumann <caumann at ualberta.ca>
To: GRASS Mailing List <GRASSLIST at baylor.edu>
Subject: [GRASSLIST:8201] MrSID and incorporating the .sdw info into resulting GeoTiff.


I have a bunch of .sid files that I am converting to GeoTiffs.   How
does one incorporate the spatial location information in their
associated .sdw file into the associate .tiff file? 


Here's what I am doing:

mrsiddecode -i FILE.sid -o FILE.tif -of tifg    
    
## Use the code for NAD27, Zone 12
## contained in EPSG file: /usr/share/proj/epsg
    
gdal_translate -of GTIFF -a_srs '+init=epsg:26712' \
	FILE.tif FILE.NAD27.tif

But when I do a gdalinfo, it is clear that the information in the .sdw
file has not been used (the "file.sdw" is given below): 

gdalinfo file.tif
Driver: GTiff/GeoTIFF
Size is 9168, 9168
Coordinate System is:
PROJCS["NAD27 / UTM zone 12N",
    GEOGCS["NAD27",
        DATUM["North_American_Datum_1927",
            SPHEROID["Clarke 1866",6378206.4,294.9786982138982,
                AUTHORITY["EPSG","7008"]],
            AUTHORITY["EPSG","6267"]],
        PRIMEM["Greenwich",0],
        UNIT["degree (supplier to define
representation)",0.01745329251994328],
        AUTHORITY["EPSG","4267"]],
    PROJECTION["Transverse_Mercator"],
    PARAMETER["latitude_of_origin",0],
    PARAMETER["central_meridian",-111],
    PARAMETER["scale_factor",0.9996],
    PARAMETER["false_easting",500000],
    PARAMETER["false_northing",0],
    UNIT["metre",1,
        AUTHORITY["EPSG","9001"]],
    AUTHORITY["EPSG","26712"]]
Origin = (-0.500000,9167.500000)
Pixel Size = (1.00000000,-1.00000000)
Corner Coordinates:
Upper Left  (      -0.500,    9167.500) (115d29'19.33"W,  0d 4'57.69"N)
Lower Left  (  -0.5000000,  -0.5000000) (115d29'19.32"W,  0d 0'0.02"S)
Upper Right (    9167.500,    9167.500) (115d24'23.63"W,  0d 4'57.72"N)
Lower Right (    9167.500,      -0.500) (115d24'23.61"W,  0d 0'0.02"S)
Center      (    4583.500,    4583.500) (115d26'51.47"W,  0d 2'28.84"N)


----------------------------------------------

The associated .sdw file is:
             1.200000000000000
             0.000000000000000
             0.000000000000000
            -1.200000000000000
        492501.000000000000000
       6243621.000000000000000