I am encountering a problem with the OCX's Image class when using grid files that start out in .img format and are converted to geotiff. The grid file is displayable when opened as a Geotiff image. Further, it can be opened as a grid file and an Image object can be created successfully using GridToImage(). The Image object can even be added to the display using AddLayer(). However, I've encountered two negative behaviours: sometimes the image cannot be saved using Image.Save(), while sometimes it saves an image but cannot open it (it gets corrupted) after saving.
I also noticed that when the image is added using AddLayer(), the image also cannot be saved from the layer reference in the MapWinGIS control.
Grids files that start out as ArcInfo grids converted to Geotiff don't seem to exhibit this problem. It's very odd. Any similar problems noted?
Comments: ** Comment from web user: sleschinski **
I also noticed that when the image is added using AddLayer(), the image also cannot be saved from the layer reference in the MapWinGIS control.
Grids files that start out as ArcInfo grids converted to Geotiff don't seem to exhibit this problem. It's very odd. Any similar problems noted?
Comments: ** Comment from web user: sleschinski **
An update: I fixed all the error message apart from this one:
_GDAL WARNING: driver GTiff does not support creation option WORLDFILE_
it appears to be valid, and will disappear by changing parameter of Image.Save.
These 2 seem to be just noise (removed now):
_The buffer into which the data should be read is null_
_No translation for an empty SRS to PROJ.4 format is known_
However this one was valid (projection is copied correctly now):
_Only OGC WKT Projections supported for writing to GeoTIFF_
Here are the changes:
https://mapwingis.codeplex.com/SourceControl/changeset/75314