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 <[email protected]>: > > 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. > _______________________________________________ > gdal-dev mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/gdal-dev > _______________________________________________ gdal-dev mailing list [email protected] http://lists.osgeo.org/mailman/listinfo/gdal-dev
