Opened 13 years ago
Closed 13 years ago
#3541 closed defect (fixed)
Unable to open certain ArcInfo Binary Grids
|Reported by:||lpinner||Owned by:||warmerdam|
I've come across quite a few ArcInfo binary grids on our system that GDAL can't read. They're variations on the newer ArcGIS 9+ Desktop grid format with multiple tile files. These variations don't have any w*.adf data or index files, just z*.adf files, could this be the issue?
The grid can be downloaded from http://www.environment.gov.au/download/testgrid.zip (~10Mb). It will there for 5 days before the webserver auto deletes it.
C:\WorkSpace>dir /b testgrid dblbnd.adf hdr.adf log prj.adf sta.adf vat.adf z001011.adf z001011x.adf z001012.adf z001012x.adf z001013.adf z001013x.adf z001014.adf z001014x.adf z001015.adf z001015x.adf C:\WorkSpace>gdalinfo testgrid ERROR 4: `testgrid' not recognised as a supported file format. gdalinfo failed - unable to open 'testgrid'. C:\WorkSpace>arc ... Arc: describe testgrid Description of Grid testgrid Cell Size = 0.000 Data Type: Integer Number of Rows = 87270 Number of Values = 2 Number of Columns = 92670 Attribute Data (bytes) = 40 BOUNDARY STATISTICS Xmin = 138.585 Minimum Value = 1.000 Xmax = 152.486 Maximum Value = 2.000 Ymin = -37.677 Mean = 1.042 Ymax = -24.586 Standard Deviation = 0.200 COORDINATE SYSTEM DESCRIPTION Projection GEOGRAPHIC Datum GDA94 Units DD Spheroid GRS1980 Parameters:
Change History (1)
comment:1 by , 13 years ago
|Status:||new → closed|
Note: See TracTickets for help on using tickets.
The core problem with this dataset seems to be that it lacks the top tile files (w001001.adf). The driver already supports the "z" files. I have modified the AIGDataset::Open() to succeed if it finds any of the tile files.
Furthermore, I modified AIGAccessTile(), and the block reading functions to only issue a warning when a tile is not found (for the first access), and to fill in the result imagery with nodata values. With these changes I can gdal_translate the whole raster to geotiff and examine it and see the hydrology network.
The changes are in trunk (r19496) and 1.7 (r19497) in time for GDAL 1.7.2.
Thanks for the report!