Getting Single Band (grayscale) GeoTiff to pass through C# wrapper into bitmap (or othe manipulation of raster data)

[dbitner]

Hello,
  I normally try to figure this out, but I've spent two days on it:

I'm currently attempting to get the GeoTIFF raster information which is my elevation data for a given dataset.  I'm basically attempting to use GDAL to drape a bitmap over my GeoTIFF (which will generate a 3d geometry).  I can't seem to pull in the GeoTIFF information through the C# GDAL wrapper utilizing ReadRaster() method (which is utilized in the GDALDatasetRasterIO.cs application).

I'm using the same exact code to troubleshoot at the moment, and the single-band grayscale TIF I'm pulling in is simply being clamped to all 255s when I look at the buffer or I output to a bitmap.  OpenEV pulls and displays the TIFF perfectly...I get the feeling this might be a little more complicated than I'm hoping...


Input file info:
Driver: GTiff/GeoTIFF
Files: d:\test\test_tif.tif
Size is 1024, 1024
Coordinate System is:
GEOGCS["WGS 84",
    DATUM["WGS_1984",
        SPHEROID["WGS 84",6378137,298.257223563,
            AUTHORITY["EPSG","7030"]],
        AUTHORITY["EPSG","6326"]],
    PRIMEM["Greenwich",0],
    UNIT["degree",0.0174532925199433],
    AUTHORITY["EPSG","4326"]]
Origin = (-105.000000000000000,39.000000000000000)
Pixel Size = (0.000976562500000,-0.000976562500000)
Metadata:
  AREA_OR_POINT=Point
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (-105.0000000,  39.0000000) (105d 0'0.00"W, 39d 0'0.00"N)
Lower Left  (-105.0000000,  38.0000000) (105d 0'0.00"W, 38d 0'0.00"N)
Upper Right (-104.0000000,  39.0000000) (104d 0'0.00"W, 39d 0'0.00"N)
Lower Right (-104.0000000,  38.0000000) (104d 0'0.00"W, 38d 0'0.00"N)
Center      (-104.5000000,  38.5000000) (104d30'0.00"W, 38d30'0.00"N)
Band 1 Block=1024x2 Type=Float32, ColorInterp=Gray

output file info:
C:\Program Files\FWTools2.4.6\bin>gdalinfo d:\test\out_test.bmp
Driver: PNG/Portable Network Graphics
Files: d:\test\out_test.bmp
Size is 1024, 1024
Coordinate System is `'
Corner Coordinates:
Upper Left  (    0.0,    0.0)
Lower Left  (    0.0, 1024.0)
Upper Right ( 1024.0,    0.0)
Lower Right ( 1024.0, 1024.0)
Center      (  512.0,  512.0)
Band 1 Block=1024x1 Type=Byte, ColorInterp=Palette
  Color Table (RGB with 256 entries)
    0: 0,0,0,255
    1: 1,1,1,255
    2: 2,2,2,255
    3: 3,3,3,255
    4: 4,4,4,255
    5: 5,5,5,255
    6: 6,6,6,255
    7: 7,7,7,255
    8: 8,8,8,255
    9: 9,9,9,255
   10: 10,10,10,255
   11: 11,11,11,255
   12: 12,12,12,255
   13: 13,13,13,255
   14: 14,14,14,255
   15: 15,15,15,255
   16: 16,16,16,255
   17: 17,17,17,255
   18: 18,18,18,255
   19: 19,19,19,255
   20: 20,20,20,255
   21: 21,21,21,255
   22: 22,22,22,255
   23: 23,23,23,255
   24: 24,24,24,255
   25: 25,25,25,255
   26: 26,26,26,255
   27: 27,27,27,255
   28: 28,28,28,255
   29: 29,29,29,255
   30: 30,30,30,255
   31: 31,31,31,255
   32: 32,32,32,255
   33: 33,33,33,255
   34: 34,34,34,255
   35: 35,35,35,255
   36: 36,36,36,255
   37: 37,37,37,255
   38: 38,38,38,255
   39: 39,39,39,255
   40: 40,40,40,255
   41: 41,41,41,255
   42: 42,42,42,255
   43: 43,43,43,255
   44: 44,44,44,255
   45: 45,45,45,255
   46: 46,46,46,255
   47: 47,47,47,255
   48: 48,48,48,255
   49: 49,49,49,255
   50: 50,50,50,255
   51: 51,51,51,255
   52: 52,52,52,255
   53: 53,53,53,255
   54: 54,54,54,255
   55: 55,55,55,255
   56: 56,56,56,255
   57: 57,57,57,255
   58: 58,58,58,255
   59: 59,59,59,255
   60: 60,60,60,255
   61: 61,61,61,255
   62: 62,62,62,255
   63: 63,63,63,255
   64: 64,64,64,255
   65: 65,65,65,255
   66: 66,66,66,255
   67: 67,67,67,255
   68: 68,68,68,255
   69: 69,69,69,255
   70: 70,70,70,255
   71: 71,71,71,255
   72: 72,72,72,255
   73: 73,73,73,255
   74: 74,74,74,255
   75: 75,75,75,255
   76: 76,76,76,255
   77: 77,77,77,255
   78: 78,78,78,255
   79: 79,79,79,255
   80: 80,80,80,255
   81: 81,81,81,255
   82: 82,82,82,255
   83: 83,83,83,255
   84: 84,84,84,255
   85: 85,85,85,255
   86: 86,86,86,255
   87: 87,87,87,255
   88: 88,88,88,255
   89: 89,89,89,255
   90: 90,90,90,255
   91: 91,91,91,255
   92: 92,92,92,255
   93: 93,93,93,255
   94: 94,94,94,255
   95: 95,95,95,255
   96: 96,96,96,255
   97: 97,97,97,255
   98: 98,98,98,255
   99: 99,99,99,255
  100: 100,100,100,255
  101: 101,101,101,255
  102: 102,102,102,255
  103: 103,103,103,255
  104: 104,104,104,255
  105: 105,105,105,255
  106: 106,106,106,255
  107: 107,107,107,255
  108: 108,108,108,255
  109: 109,109,109,255
  110: 110,110,110,255
  111: 111,111,111,255
  112: 112,112,112,255
  113: 113,113,113,255
  114: 114,114,114,255
  115: 115,115,115,255
  116: 116,116,116,255
  117: 117,117,117,255
  118: 118,118,118,255
  119: 119,119,119,255
  120: 120,120,120,255
  121: 121,121,121,255
  122: 122,122,122,255
  123: 123,123,123,255
  124: 124,124,124,255
  125: 125,125,125,255
  126: 126,126,126,255
  127: 127,127,127,255
  128: 128,128,128,255
  129: 129,129,129,255
  130: 130,130,130,255
  131: 131,131,131,255
  132: 132,132,132,255
  133: 133,133,133,255
  134: 134,134,134,255
  135: 135,135,135,255
  136: 136,136,136,255
  137: 137,137,137,255
  138: 138,138,138,255
  139: 139,139,139,255
  140: 140,140,140,255
  141: 141,141,141,255
  142: 142,142,142,255
  143: 143,143,143,255
  144: 144,144,144,255
  145: 145,145,145,255
  146: 146,146,146,255
  147: 147,147,147,255
  148: 148,148,148,255
  149: 149,149,149,255
  150: 150,150,150,255
  151: 151,151,151,255
  152: 152,152,152,255
  153: 153,153,153,255
  154: 154,154,154,255
  155: 155,155,155,255
  156: 156,156,156,255
  157: 157,157,157,255
  158: 158,158,158,255
  159: 159,159,159,255
  160: 160,160,160,255
  161: 161,161,161,255
  162: 162,162,162,255
  163: 163,163,163,255
  164: 164,164,164,255
  165: 165,165,165,255
  166: 166,166,166,255
  167: 167,167,167,255
  168: 168,168,168,255
  169: 169,169,169,255
  170: 170,170,170,255
  171: 171,171,171,255
  172: 172,172,172,255
  173: 173,173,173,255
  174: 174,174,174,255
  175: 175,175,175,255
  176: 176,176,176,255
  177: 177,177,177,255
  178: 178,178,178,255
  179: 179,179,179,255
  180: 180,180,180,255
  181: 181,181,181,255
  182: 182,182,182,255
  183: 183,183,183,255
  184: 184,184,184,255
  185: 185,185,185,255
  186: 186,186,186,255
  187: 187,187,187,255
  188: 188,188,188,255
  189: 189,189,189,255
  190: 190,190,190,255
  191: 191,191,191,255
  192: 192,192,192,255
  193: 193,193,193,255
  194: 194,194,194,255
  195: 195,195,195,255
  196: 196,196,196,255
  197: 197,197,197,255
  198: 198,198,198,255
  199: 199,199,199,255
  200: 200,200,200,255
  201: 201,201,201,255
  202: 202,202,202,255
  203: 203,203,203,255
  204: 204,204,204,255
  205: 205,205,205,255
  206: 206,206,206,255
  207: 207,207,207,255
  208: 208,208,208,255
  209: 209,209,209,255
  210: 210,210,210,255
  211: 211,211,211,255
  212: 212,212,212,255
  213: 213,213,213,255
  214: 214,214,214,255
  215: 215,215,215,255
  216: 216,216,216,255
  217: 217,217,217,255
  218: 218,218,218,255
  219: 219,219,219,255
  220: 220,220,220,255
  221: 221,221,221,255
  222: 222,222,222,255
  223: 223,223,223,255
  224: 224,224,224,255
  225: 225,225,225,255
  226: 226,226,226,255
  227: 227,227,227,255
  228: 228,228,228,255
  229: 229,229,229,255
  230: 230,230,230,255
  231: 231,231,231,255
  232: 232,232,232,255
  233: 233,233,233,255
  234: 234,234,234,255
  235: 235,235,235,255
  236: 236,236,236,255
  237: 237,237,237,255
  238: 238,238,238,255
  239: 239,239,239,255
  240: 240,240,240,255
  241: 241,241,241,255
  242: 242,242,242,255
  243: 243,243,243,255
  244: 244,244,244,255
  245: 245,245,245,255
  246: 246,246,246,255
  247: 247,247,247,255
  248: 248,248,248,255
  249: 249,249,249,255
  250: 250,250,250,255
  251: 251,251,251,255
  252: 252,252,252,255
  253: 253,253,253,255
  254: 254,254,254,255
  255: 255,255,255,255


Is there not an easy way to get these GeoTIFFs out through the C# wrapper?  It would be infinitely easier for me to keep everything into C#, but I'm getting the feeling I'm going to have to modify the wrapper.  That said, if I knew I was getting the correct data from my buffer from readraster() I can certainly forgo saving it as a bitmap.  However, getting all 255s is not my idea of an accurate depiction.

Let me know if you need anymore information.

[Tamas Szekeres]

Since you have a single band image the GDALRead.cs would be a better
example how to do this
(http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALRead.cs)

However all the examples out there use byte data type, and you might
have to modify the examples to pass an array of floats instead of
bytes, something like:

Band band = ds.GetRasterBand(1);
float[] data = new float[width * height];
band.ReadRaster(0, 0, width, height, data, width, height, 0, 0);


Best regards,

Tamas



2009/11/3 dbitner <[hidden email]>:

>
> Hello,
>  I normally try to figure this out, but I've spent two days on it:
>
> I'm currently attempting to get the GeoTIFF raster information which is my
> elevation data for a given dataset.  I'm basically attempting to use GDAL to
> drape a bitmap over my GeoTIFF (which will generate a 3d geometry).  I can't
> seem to pull in the GeoTIFF information through the C# GDAL wrapper
> utilizing ReadRaster() method (which is utilized in the
> GDALDatasetRasterIO.cs application).
>
> I'm using the same exact code to troubleshoot at the moment, and the
> single-band grayscale TIF I'm pulling in is simply being clamped to all 255s
> when I look at the buffer or I output to a bitmap.  OpenEV pulls and
> displays the TIFF perfectly...I get the feeling this might be a little more
> complicated than I'm hoping...
>
>
> Input file info:
> Driver: GTiff/GeoTIFF
> Files: d:\test\test_tif.tif
> Size is 1024, 1024
> Coordinate System is:
> GEOGCS["WGS 84",
>    DATUM["WGS_1984",
>        SPHEROID["WGS 84",6378137,298.257223563,
>            AUTHORITY["EPSG","7030"]],
>        AUTHORITY["EPSG","6326"]],
>    PRIMEM["Greenwich",0],
>    UNIT["degree",0.0174532925199433],
>    AUTHORITY["EPSG","4326"]]
> Origin = (-105.000000000000000,39.000000000000000)
> Pixel Size = (0.000976562500000,-0.000976562500000)
> Metadata:
>  AREA_OR_POINT=Point
> Image Structure Metadata:
>  INTERLEAVE=BAND
> Corner Coordinates:
> Upper Left  (-105.0000000,  39.0000000) (105d 0'0.00"W, 39d 0'0.00"N)
> Lower Left  (-105.0000000,  38.0000000) (105d 0'0.00"W, 38d 0'0.00"N)
> Upper Right (-104.0000000,  39.0000000) (104d 0'0.00"W, 39d 0'0.00"N)
> Lower Right (-104.0000000,  38.0000000) (104d 0'0.00"W, 38d 0'0.00"N)
> Center      (-104.5000000,  38.5000000) (104d30'0.00"W, 38d30'0.00"N)
> Band 1 Block=1024x2 Type=Float32, ColorInterp=Gray
>
> output file info:
> C:\Program Files\FWTools2.4.6\bin>gdalinfo d:\test\out_test.bmp
> Driver: PNG/Portable Network Graphics
> Files: d:\test\out_test.bmp
> Size is 1024, 1024
> Coordinate System is `'
> Corner Coordinates:
> Upper Left  (    0.0,    0.0)
> Lower Left  (    0.0, 1024.0)
> Upper Right ( 1024.0,    0.0)
> Lower Right ( 1024.0, 1024.0)
> Center      (  512.0,  512.0)
> Band 1 Block=1024x1 Type=Byte, ColorInterp=Palette
>  Color Table (RGB with 256 entries)
>    0: 0,0,0,255
>    1: 1,1,1,255
>    2: 2,2,2,255
>    3: 3,3,3,255
>    4: 4,4,4,255
>    5: 5,5,5,255
>    6: 6,6,6,255
>    7: 7,7,7,255
>    8: 8,8,8,255
>    9: 9,9,9,255
>   10: 10,10,10,255
>   11: 11,11,11,255
>   12: 12,12,12,255
>   13: 13,13,13,255
>   14: 14,14,14,255
>   15: 15,15,15,255
>   16: 16,16,16,255
>   17: 17,17,17,255
>   18: 18,18,18,255
>   19: 19,19,19,255
>   20: 20,20,20,255
>   21: 21,21,21,255
>   22: 22,22,22,255
>   23: 23,23,23,255
>   24: 24,24,24,255
>   25: 25,25,25,255
>   26: 26,26,26,255
>   27: 27,27,27,255
>   28: 28,28,28,255
>   29: 29,29,29,255
>   30: 30,30,30,255
>   31: 31,31,31,255
>   32: 32,32,32,255
>   33: 33,33,33,255
>   34: 34,34,34,255
>   35: 35,35,35,255
>   36: 36,36,36,255
>   37: 37,37,37,255
>   38: 38,38,38,255
>   39: 39,39,39,255
>   40: 40,40,40,255
>   41: 41,41,41,255
>   42: 42,42,42,255
>   43: 43,43,43,255
>   44: 44,44,44,255
>   45: 45,45,45,255
>   46: 46,46,46,255
>   47: 47,47,47,255
>   48: 48,48,48,255
>   49: 49,49,49,255
>   50: 50,50,50,255
>   51: 51,51,51,255
>   52: 52,52,52,255
>   53: 53,53,53,255
>   54: 54,54,54,255
>   55: 55,55,55,255
>   56: 56,56,56,255
>   57: 57,57,57,255
>   58: 58,58,58,255
>   59: 59,59,59,255
>   60: 60,60,60,255
>   61: 61,61,61,255
>   62: 62,62,62,255
>   63: 63,63,63,255
>   64: 64,64,64,255
>   65: 65,65,65,255
>   66: 66,66,66,255
>   67: 67,67,67,255
>   68: 68,68,68,255
>   69: 69,69,69,255
>   70: 70,70,70,255
>   71: 71,71,71,255
>   72: 72,72,72,255
>   73: 73,73,73,255
>   74: 74,74,74,255
>   75: 75,75,75,255
>   76: 76,76,76,255
>   77: 77,77,77,255
>   78: 78,78,78,255
>   79: 79,79,79,255
>   80: 80,80,80,255
>   81: 81,81,81,255
>   82: 82,82,82,255
>   83: 83,83,83,255
>   84: 84,84,84,255
>   85: 85,85,85,255
>   86: 86,86,86,255
>   87: 87,87,87,255
>   88: 88,88,88,255
>   89: 89,89,89,255
>   90: 90,90,90,255
>   91: 91,91,91,255
>   92: 92,92,92,255
>   93: 93,93,93,255
>   94: 94,94,94,255
>   95: 95,95,95,255
>   96: 96,96,96,255
>   97: 97,97,97,255
>   98: 98,98,98,255
>   99: 99,99,99,255
>  100: 100,100,100,255
>  101: 101,101,101,255
>  102: 102,102,102,255
>  103: 103,103,103,255
>  104: 104,104,104,255
>  105: 105,105,105,255
>  106: 106,106,106,255
>  107: 107,107,107,255
>  108: 108,108,108,255
>  109: 109,109,109,255
>  110: 110,110,110,255
>  111: 111,111,111,255
>  112: 112,112,112,255
>  113: 113,113,113,255
>  114: 114,114,114,255
>  115: 115,115,115,255
>  116: 116,116,116,255
>  117: 117,117,117,255
>  118: 118,118,118,255
>  119: 119,119,119,255
>  120: 120,120,120,255
>  121: 121,121,121,255
>  122: 122,122,122,255
>  123: 123,123,123,255
>  124: 124,124,124,255
>  125: 125,125,125,255
>  126: 126,126,126,255
>  127: 127,127,127,255
>  128: 128,128,128,255
>  129: 129,129,129,255
>  130: 130,130,130,255
>  131: 131,131,131,255
>  132: 132,132,132,255
>  133: 133,133,133,255
>  134: 134,134,134,255
>  135: 135,135,135,255
>  136: 136,136,136,255
>  137: 137,137,137,255
>  138: 138,138,138,255
>  139: 139,139,139,255
>  140: 140,140,140,255
>  141: 141,141,141,255
>  142: 142,142,142,255
>  143: 143,143,143,255
>  144: 144,144,144,255
>  145: 145,145,145,255
>  146: 146,146,146,255
>  147: 147,147,147,255
>  148: 148,148,148,255
>  149: 149,149,149,255
>  150: 150,150,150,255
>  151: 151,151,151,255
>  152: 152,152,152,255
>  153: 153,153,153,255
>  154: 154,154,154,255
>  155: 155,155,155,255
>  156: 156,156,156,255
>  157: 157,157,157,255
>  158: 158,158,158,255
>  159: 159,159,159,255
>  160: 160,160,160,255
>  161: 161,161,161,255
>  162: 162,162,162,255
>  163: 163,163,163,255
>  164: 164,164,164,255
>  165: 165,165,165,255
>  166: 166,166,166,255
>  167: 167,167,167,255
>  168: 168,168,168,255
>  169: 169,169,169,255
>  170: 170,170,170,255
>  171: 171,171,171,255
>  172: 172,172,172,255
>  173: 173,173,173,255
>  174: 174,174,174,255
>  175: 175,175,175,255
>  176: 176,176,176,255
>  177: 177,177,177,255
>  178: 178,178,178,255
>  179: 179,179,179,255
>  180: 180,180,180,255
>  181: 181,181,181,255
>  182: 182,182,182,255
>  183: 183,183,183,255
>  184: 184,184,184,255
>  185: 185,185,185,255
>  186: 186,186,186,255
>  187: 187,187,187,255
>  188: 188,188,188,255
>  189: 189,189,189,255
>  190: 190,190,190,255
>  191: 191,191,191,255
>  192: 192,192,192,255
>  193: 193,193,193,255
>  194: 194,194,194,255
>  195: 195,195,195,255
>  196: 196,196,196,255
>  197: 197,197,197,255
>  198: 198,198,198,255
>  199: 199,199,199,255
>  200: 200,200,200,255
>  201: 201,201,201,255
>  202: 202,202,202,255
>  203: 203,203,203,255
>  204: 204,204,204,255
>  205: 205,205,205,255
>  206: 206,206,206,255
>  207: 207,207,207,255
>  208: 208,208,208,255
>  209: 209,209,209,255
>  210: 210,210,210,255
>  211: 211,211,211,255
>  212: 212,212,212,255
>  213: 213,213,213,255
>  214: 214,214,214,255
>  215: 215,215,215,255
>  216: 216,216,216,255
>  217: 217,217,217,255
>  218: 218,218,218,255
>  219: 219,219,219,255
>  220: 220,220,220,255
>  221: 221,221,221,255
>  222: 222,222,222,255
>  223: 223,223,223,255
>  224: 224,224,224,255
>  225: 225,225,225,255
>  226: 226,226,226,255
>  227: 227,227,227,255
>  228: 228,228,228,255
>  229: 229,229,229,255
>  230: 230,230,230,255
>  231: 231,231,231,255
>  232: 232,232,232,255
>  233: 233,233,233,255
>  234: 234,234,234,255
>  235: 235,235,235,255
>  236: 236,236,236,255
>  237: 237,237,237,255
>  238: 238,238,238,255
>  239: 239,239,239,255
>  240: 240,240,240,255
>  241: 241,241,241,255
>  242: 242,242,242,255
>  243: 243,243,243,255
>  244: 244,244,244,255
>  245: 245,245,245,255
>  246: 246,246,246,255
>  247: 247,247,247,255
>  248: 248,248,248,255
>  249: 249,249,249,255
>  250: 250,250,250,255
>  251: 251,251,251,255
>  252: 252,252,252,255
>  253: 253,253,253,255
>  254: 254,254,254,255
>  255: 255,255,255,255
>
>
> Is there not an easy way to get these GeoTIFFs out through the C# wrapper?
> It would be infinitely easier for me to keep everything into C#, but I'm
> getting the feeling I'm going to have to modify the wrapper.  That said, if
> I knew I was getting the correct data from my buffer from readraster() I can
> certainly forgo saving it as a bitmap.  However, getting all 255s is not my
> idea of an accurate depiction.
>
> Let me know if you need anymore information.
>
> --
> View this message in context: http://n2.nabble.com/Getting-Single-Band-grayscale-GeoTiff-to-pass-through-C-wrapper-into-bitmap-or-othe-manipulation-of--tp3940618p3940618.html
> Sent from the GDAL - Dev mailing list archive at Nabble.com.
> _______________________________________________
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>

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[dbitner]

That was insanely easy, I feel like a total idiot...I seriously contemplated going the 1 for 1 route, but decided that I wasn't getting the correct data into my buffer.  I guess I wasn't fiddling with the correct datatype (which I thought I did try to force it to float).

To get the bitmap image I did have to scale the floats to be RGB compliant (0 to 255).  Is this a correct way to display an elevation geotiff??  Also, are there any plans in utilizing a raster image (IE this geotiff I have) as a DEM in OGR, specifically for C#?


This library is a lifesaver fyi...Thanks!

Tamas Szekeres wrote:

Since you have a single band image the GDALRead.cs would be a better
example how to do this
(http://trac.osgeo.org/gdal/browser/trunk/gdal/swig/csharp/apps/GDALRead.cs)

However all the examples out there use byte data type, and you might
have to modify the examples to pass an array of floats instead of
bytes, something like:

Band band = ds.GetRasterBand(1);
float[] data = new float[width * height];
band.ReadRaster(0, 0, width, height, data, width, height, 0, 0);


Best regards,

Tamas


<snip>

[Tamas Szekeres]

2009/11/3 dbitner <[hidden email]>:

>
> That was insanely easy, I feel like a total idiot...I seriously contemplated
> going the 1 for 1 route, but decided that I wasn't getting the correct data
> into my buffer.  I guess I wasn't fiddling with the correct datatype (which
> I thought I did try to force it to float).
>
> To get the bitmap image I did have to scale the floats to be RGB compliant
> (0 to 255).  Is this a correct way to display an elevation geotiff??  Also,
> are there any plans in utilizing a raster image (IE this geotiff I have) as
> a DEM in OGR, specifically for C#?
>

You might want to convert your data into a coloured RGB raster for
displaying purposes. As an option you could wrap your data within a
GDAL VRT (virtual) data source (by defining the bands as
ComplexSource-s) and apply a LUT for each band for scaling the data.
For more information see: http://www.gdal.org/gdal_vrttut.html

Alternatively you could also do the same suff with C# in a pixel-to-pixel basis.


I'm not totally sure what you mean by utilizing your raster image in
OGR, could you clarify this?


Best regards,

Tamas
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