On 21/01/14 22:44, Giacomo Fontanelli wrote:
dear community
I'm gonna report a problem that I observed frequently. I have polygon
shapefile, downloaded from the net, representing the path of a
satellite. I think this shapefile derive from a .kml, but I'm not sure.
This layer is WGS84 EPSG:4326.
I have also a layer in UTM 32N (EPSG:32632).
If I work with the on the fly projection I can see both the layers
correctly reprojected and positioned in EPSG 32632 (this must be the
reference system of my project), but once I deflag the on fly projection
and I try to reproject the WGS84 layer (Vector>Define projection) in UTM
32 N, the polygons are absolutely not overlayed.
If I start again the on the fly projectio I don't get any overlay, the
only way to reach a good positioning is to reproject again the first
layer in the native reference system (WGS84) and using the on the fly
reprojection.
My impression is thar QGIS doesn't correctly reproject the shapefiles
coming from .kml, am I wrong?
Thank you very much
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Hi Giacomo,
It may be possible that your shapefile does not have a spatial index
(depends on tool used to convert from kml).
Try opening your original file in a new project projected in WGS84
EPSG:4326, then reproject it to EPSG 32632 giving it a new name.
Open your original project in UTM 32N (EPSG:32632) and open the newly
created satellite file.
Does this work?
--
Cheers Simon
Simon Cropper - Open Content Creator
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