Changes between Initial Version and Version 4 of Ticket #1198


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Timestamp:
Apr 4, 2007, 8:21:45 PM (17 years ago)
Author:
warmerdam
Comment:

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  • Ticket #1198

    • Property Priority high → normal
    • Property Milestone → 1.5.0

  • Ticket #1198 – Description

    initial v4  
     1When the uncompressed size of an ESRI binary GRID dataset is near 2 GB, a second tile index file (e.g., w001000x.adf) is created which references a second raster data file (e.g., w001000.adf). This is true even if the actual run-length-encoded data size is well under 2 GB. ESRI support site refers to these as "multitiled" rasters in Article ID 27056:
     2
     3"A multitiled raster is usually created when the number of cells times the number of bytes per cell is close to 2 GB. Multitiled raster can be identified by looking in the workspace folder. If there is more than one wNNNNNNx.adf (N = numeric value) file, then the raster is multitiled."
     4
     5GDAL (1.3.1 and 1.3.2) returns an error when it attempts to read data referenced by the second tile index file, e.g.,
    16{{{
    2 When the uncompressed size of an ESRI binary GRID dataset is near 2 GB, a
    3 second tile index file (e.g., w001000x.adf) is created which references a
    4 second raster data file (e.g., w001000.adf). This is true even if the actual
    5 run-length-encoded data size is well under 2 GB. ESRI support site refers to
    6 these as "multitiled" rasters in Article ID 27056:
    7 
    8 "A multitiled raster is usually created when the number of cells times the
    9 number of bytes per cell is close to 2 GB. Multitiled raster can be identified
    10 by looking in the workspace folder. If there is more than one wNNNNNNx.adf (N =
    11 numeric value) file, then the raster is multitiled."
    12 
    13 GDAL (1.3.1 and 1.3.2) returns an error when it attempts to read data
    14 referenced by the second tile index file, e.g.,
    15 
    167ERROR 1: IReadBlock failed at X offset 0, Y offset 5016
    178ERROR 1: GetBlockRef failed at X block offset 0, Y block offset 5016
     9}}}
    1810
    19 OpenEV will open these "multitiled" GRIDs, but does not correctly display the
    20 data referenced by the second tile index.
     11OpenEV will open these "multitiled" GRIDs, but does not correctly display the data referenced by the second tile index.
    2112
    2213An example dataset (79470565.zip) is at:
    23 (slow) ftp://ftp2.fs.fed.us/incoming/rmrs/missoula/ifsl/LANDFIRE/CToney_7.21.05/
     14(slow)
     15{{{
     16ftp://ftp2.fs.fed.us/incoming/rmrs/missoula/ifsl/LANDFIRE/CToney_7.21.05/
    2417
    2518or via http at: