QGIS » QGIS Application

The following has been tested with data from the QGIS sample dataset (plus the small shapefile attached to this ticket) but also with data from other geographic regions/projections.

When the problem occurs qgis freezes, starts to eat memory/cpu and eventually crashes (in the 1.4 version the crash is immediate). It has been proved on ubuntu 9.04, 9.10, Debian testing and Windows XP.

Steps:

*) add the "alaska.shp" shapefile from the qgis sample dataset.

) set the project crs as the one of the above vector, EPSG:2964 and *enable on the fly reprojection

*) add the "landcover.img" raster from the qgis sample dataset (it is defined in the the EPSG:2964 crs)

*) add to the project the attached shapefile ("alaska_clipped.shp"): it was obtained by clipping the Alaska region from the "world borders" shapefile, that is defined in the WGS84 crs (EPSG:4326)

everything align OK, because the last vector is correctly reprojected in the EPSG:2964 coordinate system

*) uncheck from the legend the raster layer

*) go in the project properties and change the project crs from EPSG:2964 to EPSG:4326

*) at this stage the two vectors still align perfectly as the first one is reprojected in the EPSG:4326 coordinate system

*) now check the raster layer in the legend (I KNOW THAT WON'T BE REPROJECTED IN ANY CASE): qgis freezes, starts to eat memory/cpu and eventually crashes

The counter test DOES NOT CAUSE qgis to crash. Steps:

*) Use the gdal_warp utility to reproject the "landcover.img" raster from EPSG:2964 to EPSG:4326

*) Add the obtained raster to a new project defined in the EPSG:4326 coordinate system and enable on the fly reprojection

*) add the attached shapefile ("alaska_clipped.shp")

*) add the shapefile "alaska.shp" from the qgis sample dataset

everything align OK, because the last vector is correctly reprojected in the EPSG:4326 coordinate system

*) uncheck from the legend the raster layer

*) go in the project properties and change the project crs from EPSG:4326 to EPSG:2964

*) at this stage the two vectors still align perfectly as the first one is reprojected in the EPSG:2964 coordinate system

*) now check the raster layer in the legend (I KNOW THAT WON'T BE REPROJECTED IN ANY CASE): qgis does not freeze nor crash, it simple does not show the raster as expected.