[Thuban-list] map mode 'identify' only works when clicking onboundaries & projection management question

Moritz Lennert mlennert at club.worldonline.be
Tue Jul 8 10:16:42 CEST 2003

Jonathan Coles said:
> On Mon, 2003-07-07 at 18:10, Moritz Lennert wrote:
>> 1) When using the 'identify' mode, I have to click on the boundaries of
>> my
>> polygons to select a polygon. This is not very practical, as most of the
>> boundaries are shared, and so I don't know which of the two polygons
>> will
>> be selected. Would it be possible to create a selection where the user
>> has
>> to click inside the area and not on the boundary ?
> Clicking inside a polygon *is* how 'identify' should work. Do you have
> this problem with the iceland sample that you could tell me how to
> reproduce?

Bernhard's explanation was the good one. I have to fill the polygons to be
able to select them. I don't find this very intuitive, but as long as it
will be documented, I guess it's alright. I can confirm, BTW that using a
classification, I have to change the default fill color to be able to
select any of the polygons, even those filled by the classification.

>> 2) I don't really understand the projection management, yet ? Is it
>> possible to re-project data ? I've tried doing so, but I only get empty
>> screens. What really confuses me is that I have shpae files that
>> (should)
>> use the Belgian Datum 1972, but when I load them and then click on
>> projection for that layer, the only one that works is <none>. All the
>> others giving me empty screens, including the Belgian Datum. Could you
>> enlighten me on how projections work in Thuban ?
> When you load a layer you must select the projection that that layer's
> data is in (Layer->Projection). You must then select which Projection
> the map is in (Map->Projection). This can be whatever you like allowing
> you to reproject the layers. If the only layer projection that is
> working is <None> then perhaps the data in the shapefile is not what you
> think. Is it something you could send to me so I can see what is going
> on?

I didn't select the map projection. When I do this, everything works
perfectly. Thanks !


More information about the Thuban-list mailing list

This site is hosted by Intevation GmbH (Datenschutzerklärung und Impressum | Privacy Policy and Imprint)