Can't open this USGS DEM

[gaopeng]

Attached should be a USGS DEM. But GDAL can't open it. It looks like it has wrong header info.

[warmerdam]

The file is somewhat non-standard. In particular it uses -9999 and -9 for fields like coordinate system and units that it has no particular idea about. I have made adjustements to the driver to support this file in trunk (r19267) and 1.6-esri (r19268).

[gaopeng]

This DEM should have no spatial reference. But it returns a real (wrong) SR, instead of none.

[warmerdam]

I have made an adjustment to treat this sort of file as having no coordinate system in trunk (r19283) and 1.6-esri (r19284).

[gaopeng]

Another problem. The DEM should be 200x200 looking like a circle. But currently only half of the image is visible, and the rest are considered bad.

            fscanf(poGDS->fp, "%d", &nElev);
            if (iY < 0 || iY >= GetYSize() )
                bad = TRUE;

[warmerdam]

The problem turned out to be another place assuming not PROJCS must measured in arcseconds. Fixed in trunk (r19291) and 1.6-esri (r19292).