Hi,

I can't generate mosaic from TIF files (+ TFW). It's really specific to this 
format because with PNG files (+ PGW) I can generate.

I need to install anything other than GeoServer to do this ?

When I publish an datastore with the "GeoTIFF Tagged Image File Format with 
Geographic Information" option (only one TIF at a time) , it's good. When I 
publish an datastore with "ImageMosaic - Image mosaicking plugin" option (with 
url directory), I get an error.

My Datas are projected to EPSG code 2154 (french lambert 93).

GDALinfo describes an image as :

Driver: GTiff/GeoTIFF
Files: SC25_TOPO_0510_6340_L93.tif
       SC25_TOPO_0510_6340_L93.tfw
Size is 4000, 4000
Coordinate System is `'
Origin = (510000.000000000000000,6340000.000000000000000)
Pixel Size = (2.500000000000000,-2.500000000000000)
Image Structure Metadata:
  INTERLEAVE=BAND
Corner Coordinates:
Upper Left  (  510000.000, 6340000.000)
Lower Left  (  510000.000, 6330000.000)
Upper Right (  520000.000, 6340000.000)
Lower Right (  520000.000, 6330000.000)
Center      (  515000.000, 6335000.000)
Band 1 Block=4000x2 Type=Byte, ColorInterp=Palette
  Color Table (RGB with 256 entries)
    0: 255,255,255,255
    1: 255,0,255,255
    2: 0,51,255,255
    3: 0,128,255,255
    4: 179,217,255,255
    5: 0,255,255,255
    6: 102,255,255,255
    7: 0,255,0,255
    8: 102,255,76,255
    9: 85,255,0,255
   10: 128,255,64,255
   11: 209,255,186,255
   12: 224,255,209,255
   13: 255,255,0,255
   14: 255,153,76,255
   15: 230,153,128,255
   16: 255,0,51,255
   17: 0,0,0,255
   18: 249,249,249,255
   19: 243,243,243,255
   20: 237,237,237,255
   21: 231,231,231,255
   22: 225,225,225,255
   23: 219,219,219,255
   24: 213,213,213,255
   25: 207,207,207,255
   26: 201,201,201,255
   27: 195,195,195,255
   28: 189,189,189,255
   29: 183,183,183,255
   30: 177,177,177,255
   31: 171,171,171,255
   32: 165,165,165,255
   33: 122,168,99,255
   34: 127,173,104,255
   35: 132,178,109,255
   36: 140,186,117,255
   37: 145,191,122,255
   38: 150,196,127,255
   39: 155,201,132,255
   40: 160,206,137,255
   41: 168,214,145,255
   42: 173,219,150,255
   43: 178,224,155,255
   44: 186,232,163,255
   45: 191,237,168,255
   46: 196,242,173,255
   47: 204,250,181,255
   48: 135,166,120,255
   49: 141,172,126,255
   50: 147,178,132,255
   51: 153,184,138,255
   52: 159,190,144,255
   53: 165,196,150,255
   54: 171,202,156,255
   55: 177,208,162,255
   56: 183,214,168,255
   57: 189,220,174,255
   58: 195,226,180,255
   59: 201,232,186,255
   60: 207,238,192,255
   61: 214,244,198,255
   62: 219,249,204,255
   63: 128,128,128,255
   64: 8,8,8,255
   65: 49,16,16,255
   66: 18,35,18,255
   67: 49,41,25,255
   68: 41,41,41,255
   69: 8,16,58,255
   70: 49,8,49,255
   71: 82,49,8,255
   72: 58,66,41,255
   73: 107,115,49,255
   74: 16,74,123,255
   75: 90,90,90,255
   76: 99,82,74,255
   77: 82,107,74,255
   78: 107,115,82,255
   79: 123,123,123,255
   80: 8,49,90,255
   81: 90,8,74,255
   82: 197,123,99,255
   83: 107,247,82,255
   84: 140,181,123,255
   85: 16,132,247,255
   86: 148,148,147,255
   87: 214,165,148,255
   88: 148,197,140,255
   89: 165,214,146,255
   90: 148,247,140,255
   91: 181,230,148,255
   92: 181,247,165,255
   93: 132,205,186,255
   94: 199,215,150,255
   95: 231,182,172,255
   96: 197,230,148,255
   97: 197,247,181,255
   98: 230,247,194,255
   99: 224,206,196,255
  100: 230,197,181,255
  101: 181,214,247,255
  102: 206,8,189,255
  103: 230,214,214,255
  104: 218,243,214,255
  105: 230,247,214,255
  106: 227,233,247,255
  107: 247,230,230,255
  108: 204,216,236,255
  109: 156,189,222,255
  110: 247,156,247,255
  111: 16,99,230,255
  112: 247,8,247,255
  113: 214,247,181,255
  114: 206,156,16,255
  115: 247,247,230,255
  116: 239,8,49,255
  117: 247,222,214,255
  118: 231,246,231,255
  119: 16,132,181,255
  120: 16,181,8,255
  121: 23,8,10,255
  122: 25,8,25,255
  123: 25,25,8,255
  124: 25,25,25,255
  125: 25,99,8,255
  126: 247,189,247,255
  127: 247,211,197,255
  128: 33,239,16,255
  129: 41,57,42,255
  130: 41,132,148,255
  131: 41,140,16,255
  132: 49,66,99,255
  133: 58,58,58,255
  134: 58,82,156,255
  135: 58,99,115,255
  136: 58,156,189,255
  137: 58,189,33,255
  138: 66,41,41,255
  139: 66,90,66,255
  140: 66,156,247,255
  141: 74,74,74,255
  142: 74,82,49,255
  143: 74,107,49,255
  144: 74,123,206,255
  145: 74,239,49,255
  146: 82,173,148,255
  147: 82,247,16,255
  148: 90,74,25,255
  149: 90,148,49,255
  150: 90,181,181,255
  151: 90,189,66,255
  152: 99,66,49,255
  153: 99,115,156,255
  154: 99,132,107,255
  155: 107,49,99,255
  156: 107,82,16,255
  157: 107,107,107,255
  158: 107,156,230,255
  159: 107,247,49,255
  160: 115,140,82,255
  161: 115,173,82,255
  162: 115,181,247,255
  163: 115,206,82,255
  164: 123,148,107,255
  165: 123,148,189,255
  166: 214,149,140,255
  167: 132,8,107,255
  168: 132,99,90,255
  169: 132,107,16,255
  170: 132,123,107,255
  171: 132,156,140,255
  172: 140,16,25,255
  173: 123,51,26,255
  174: 140,90,66,255
  175: 140,140,140,255
  176: 140,148,74,255
  177: 140,148,123,255
  178: 140,165,107,255
  179: 141,181,107,255
  180: 140,230,115,255
  181: 140,247,82,255
  182: 148,82,132,255
  183: 148,123,33,255
  184: 247,167,89,255
  185: 148,173,82,255
  186: 8,74,173,255
  187: 148,181,140,255
  188: 148,197,123,255
  189: 148,197,247,255
  190: 239,74,99,255
  191: 148,222,181,255
  192: 148,247,107,255
  193: 156,115,107,255
  194: 156,132,140,255
  195: 156,140,49,255
  196: 156,165,107,255
  197: 156,165,123,255
  198: 156,181,123,255
  199: 156,206,99,255
  200: 230,189,230,255
  201: 165,8,148,255
  202: 165,107,82,255
  203: 165,165,189,255
  204: 165,181,165,255
  205: 165,181,189,255
  206: 165,197,140,255
  207: 247,90,247,255
  208: 247,247,8,255
  209: 165,214,247,255
  210: 165,230,143,255
  211: 16,33,230,255
  212: 165,230,165,255
  213: 164,230,181,255
  214: 165,247,123,255
  215: 165,247,141,255
  216: 8,25,132,255
  217: 214,232,180,255
  218: 173,107,247,255
  219: 173,148,74,255
  220: 173,148,148,255
  221: 173,173,82,255
  222: 173,173,148,255
  223: 181,16,107,255
  224: 200,58,184,255
  225: 198,140,115,255
  226: 181,181,99,255
  227: 181,181,165,255
  228: 181,197,123,255
  229: 181,198,206,255
  230: 181,197,239,255
  231: 181,214,145,255
  232: 8,247,247,255
  233: 181,214,230,255
  234: 181,230,132,255
  235: 181,230,181,255
  236: 181,230,206,255
  237: 181,230,247,255
  238: 181,247,147,255
  239: 25,148,90,255
  240: 181,247,181,255
  241: 202,111,185,255
  242: 207,125,63,255
  243: 189,165,165,255
  244: 189,197,140,255
  245: 197,156,189,255
  246: 201,170,121,255
  247: 212,183,171,255
  248: 197,197,214,255
  249: 204,224,197,255
  250: 203,220,214,255
  251: 197,230,165,255
  252: 239,239,82,255
  253: 235,230,197,255
  254: 197,247,165,255
  255: 197,247,197,255

Geoserver log said :
2011-11-07 11:29:21,028 INFO [geoserver.web] - Getting list of coverages for 
saved store file:D:/SIG/test4
java.lang.RuntimeException: Could not list layers for this store, an error 
occurred retrieving them: Unable to acquire a reader for this coverage with 
format: ImageMosaic

Hoping that someone finds the solution I'm looking for long days. I 
successfully with samples downloaded from internet with another format (png) 
but impossible with these official raster provided by a national organization !

Thanks 

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