To convert the raster into a shapefile I use raster->conversion->polygonize but QGIS doesn't open the new layer overlayed the first (the raster) but reflected above it.
I read this question Polygonize problem but it is incomplete and there are no solutions. I've changed CRS I used EPSG 4326 for both or User Defined but nothing... I've changed image format, .tiff .jpg, nothing! HELP! Thanks a lot!
This is the original .bmp file: These are the metadata of the shape file:
Storage type of this layer: ESRI Shapefile
Source for this layer: gisprovavector
Geometry type of the features in this layer: Polygon
The number of features in this layer: 2
Editing capabilities of this layer: Add Features, Delete Features, Change Attribute Values, Add Attributes, Delete Attributes, Create Spatial Index, Fast Access to Features at ID, Change Geometries
In layer spatial reference system units : xMin,yMin 0,0 : xMax,yMax 962,500
Layer Spatial Reference System:
+proj=longlat +ellps=WGS72 +towgs84=0,0,1.9,0,0,0.814,-0.38 +no_defs
I use QGIS 1.8.0 in a Windows XP!