[gdal-dev] Problem with old projection string

[Derrick Hoffman]

Hello:

 

A project I am working on has recently updgraded to GDAL 1.6 from an
older version (I'm not sure, but I think 1.3)

 

I have a raster with an older projection string that is stored in a .prj
file and looks like this:

 

PROJCS["UTM Zone 17, Northern
Hemisphere",GEOGCS["NAD83",DATUM["North_American_Datum_1983",SPHEROID["G
RS
1980",6378137,298.257222101,AUTHORITY["EPSG","7019"]],TOWGS84[0,0,0,0,0,
0,0],AUTHORITY["EPSG","6269"]],PRIMEM["Greenwich",0,AUTHORITY["EPSG","89
01"]],UNIT["degree",0.0174532925199433,AUTHORITY["EPSG","9108"]],AXIS["L
at",NORTH],AXIS["Long",EAST],AUTHORITY["EPSG","4269"]],PROJECTION["Trans
verse_Mercator"],PARAMETER["latitude_of_origin",0],PARAMETER["central_me
ridian",-81],PARAMETER["scale_factor",0.9996],PARAMETER["false_easting",
500000],PARAMETER["false_northing",0],UNIT["Meter",1]]

 

I am trying to get the coordinates in lat/lon using some code that looks
like this:

 

//Get GDAL reprojection transform

void * pTransformArg = GDALCreateReprojectionTransformer(sourceArray,
destArray);

 

//Transform

int success;

double inX = x;

double inY = y;

double inZ = z;

 

GDALReprojectionTransform(pTransformArg, FALSE, 1, &inX, &inY, &inZ,
&success);

 

Where destArray is -> "GEOGCS[\"WGS
84\",DATUM[\"WGS_1984\",SPHEROID[\"WGS
84\",6378137,298.257223563,AUTHORITY[\"EPSG\",\"7030\"]],AUTHORITY[\"EPS
G\",\"6326\"]],PRIMEM[\"Greenwich\",0,AUTHORITY[\"EPSG\",\"8901\"]],UNIT
[\"degree\",0.01745329251994328,AUTHORITY[\"EPSG\",\"9122\"]],AUTHORITY[
\"EPSG\",\"4326\"]]";

 

My problem is that when the dataset is opened, the projection string it
reports is just "Local_CS[""]"

 

Any ideas on how I can get the projection for the file in a manner that
my GDAL conversion will work, or an alternative method for converting?

 

Thanks

Derrick Hoffman

Software Engineer

Pro Logic Inc.

304 333-2680 x 322

derrick.hoffman at ultra-prologic.com

 


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