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Posted by Berend Veldkamp on September 26, 2005, 2:03 pm
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Alessio B. wrote:
> Hy to every one!
> I've a very big problem working with arcview 9.
> I live in the center of Italy.
> Here we have two main projection system:
> 1- Cassnini-Soldner only used to exchange data with "catasto"
> 2- Gauss-Boaga for all other use
>
> When I start work with arcview 9 some one (my Major) give me some shape file
> and some raster file (ortophoto) and say to me that they are project in
> Gauss-Boaga. When I add this data in a project and I watch what kind of
> projetc they have in the propertie dialog i see "custom".
> Athough I've verified that they are oriented in gauss overlapping whit other
> data certified to be Gauss-Boaga.
> Now the questions is:
> How can i to instruct the shape to have Gauss-Boaga coordinate system?
> As I have said before the shape is intrinsically Gauss-Boaga so i think that
> in this case is sufficient to "inform" the shape with the correct parameter
> of Gauss-Boaga for the center of Italy without reproject it.
> More over I've to do the same thing with the Cassini shape...!
> I think that this procedure is a preliminary matter to allow me, when of it
> I have need, to reproject and overlap shapes in the two standards.
> I hope that someone here can help me!I really need to know the correct
> parameter (Gauss-Boaga & Cassni-Soldner for the center of italy) to
> instruct Arcview to know how shape is Cassni-Soldner and how is Gauss-Boaga.
> Please sorry for my english..
> I'm waiting for some help!
> thanks in advance!
>
>
If you're sure the data is in Gauss-Boaga, open ArcCatalog, select the
shapefile and select the menu "File | Properties". On the "Fields" tab,
select "Shape", and in the bottom list click on the button next to
"Spatial Reference". Click "Select", browse to "Projected Coordinate
Systems | National Grids" and choose the projection you want. In your
case probably "Roma 1940 Gauss Boaga Est" or "Roma 1940 Gauss Boaga Ovest".
BTW, it seems these two projections were added in ArcGIS version 9.x, so
the "Custom" projection may be a relic from 8.x, to approximate Gauss-Boaga.
HTH, Berend
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