[Qgis-user] problem reprojecting some shapefiles

[Carlos Cerdán]

Hi Giacomo

As his name says "Define projection" is used when a layer has not defined
his projection; so in this case I think the right way is to reproject the
path of satellite, from Lat-Long to UTM... but this has a cost in
representation: if your Lat-Long layer represents the whole world, when you
reproject it to UTM, it is terribly "deformed". Try with a world map to see
it.

So maybe it's is better if you cut the satellite layer to fit your interest
area and after it, to reproject to UTM.

Regards

Carlos Cerdan



2014/1/21 Giacomo Fontanelli <giacomofontanelli76 at gmail.com>

> 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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