[Gvsig_english] Calculating areas in the atribute table.

[jaume domínguez faus]

Thanks Wolfgang!

Well, regarding point A, I recorded a video for the 3rd gvSIG 
Conferences past November were I give some points about the comming 
extended symbols, and legends. The video, I think, was distributed in 
the DVD of the conferences and I thought that it was also published in 
the web. But I took a walk around the website and I couldn't find any 
reference to it.

Anyway, while we wait for the hole documentation about the conferences 
to be published in the web I'll upload the video to YouTube this weekend 
if possible. I'll send a message to the list if I'm successful.

I also want to highlight that we are working in full SLD support 
including new types of legends based up on expressions which will allow 
to handle natively the OGC Filter spec. And after it we will face the 
support for ESRI's AVL files taking profit of the new extensible and 
driver-based design for legend files.

This is regarding the symbols and legends. About the labels and 
labelings well, I'm actually in debugging time and I want to record 
another video demo regarding label placements with all the possibilities 
(avoiding overlapping, place label in the best place depending on the 
geometry type and shape, removing repeated labels (not yet implemented 
but soon)) as well as label styles supporting SVG files (and also PNG, 
GIF, JPEG) , label with multiple fields/texts calculated with 
user-defined expressions, labels with priorities (not yet implemented 
but after the "remove repeated" function), etc... I try to record it 
very soon (next days)

Cheers!
Salut!

Best



Wolfgang Qual wrote:
> Hello Antonio,
> yes, gvSIG rocks! And it is good to see that more and more people get interested in this program. Well, I'll try to answer your questions:
>
> regarding A)
> as far as I know, gvsig-developers are very busy with enhancing options for labeling and symbols (legend). Hopefully,it will not take too long to see these features in a new version (All the best, Jaume!)
>
> regarding B)
> recent versions of gvSIG (at least 1.1) provide a "field calculator". To be able to use it, you will have to follow these steps:
>
> 1) make the desired theme active, right-click - start editing
> 2) open the attribute table of that theme, click on the attribute column for which you would like to calculate area, perimeter --> on the menu bar, there will appear a new symbol which looks like a calculator.
> 3) This field calculator allows you to use differrent calculations, among others also area and perimeter. It's very similar to ArcView 3.2.
> I also would like to mention that there is no automatical update of items like area and perimeter. This would really make sense. Developers?
>
> regarding C)
> I fear that I do not the status of this feature. I agree that this would be nice to have.
>
> Cheers,
> Wolfgang
>
>
> -------- Original-Nachricht --------
>   
>> Datum: Thu, 24 Jan 2008 14:28:15 -0000
>> Von: "Antonio Gennarini" <AntonioGennarini at esinternational.com>
>> An: gvsig_internacional at runas.cap.gva.es
>> Betreff: [Gvsig_english] Calculating areas in the atribute table.
>>     
>
>   
>> Hi.
>>
>> First of all I'd like to express my compliments to all those who are
>> participating to this project as I think that it's gret to have such a
>> comprehensive open source tool for GIS purposes. We are thinking of
>> implementing the use of this software within our company but need to
>> fully assess it's capabilities in order to make a correct judgement. 
>>
>> I have several questions I need to ask hoping that someone of you will
>> find the time and patience to answer:
>>
>> A) I find the formatting of legends and labels in gvSIG a bit more
>> complex than in ArcGIS. Any programs to enhance these features in the
>> future?
>> B) One thing that I ind useful is creating fields in the attribute table
>> of polygon shapefiles and autoatically populating the columns with
>> areas, coordinates, perimeters, etc. Is there some sort of calculator
>> for the attribute table? The area calculator button is useful but not
>> for this kind of operation.
>> C) ArcGIS is good a putting grids on maps and the formatting of these
>> grids is relatively simple and powerful. I have not found a way to stick
>> the coordiante labels in the grids.
>>
>> Many thanks
>>
>>
>> Antonio Gennarini
>> Project Consultant
>> -------------------------------------
>> ESI Ltd
>> Soil and Groundwater Specialists
>> New Zealand House
>> 160, Abbey Foregate
>> Shrewsbury SY2 6FD
>> Telephone: +44 (0)1743 276100 Direct Dial: +44 (0)1743 276145
>> Fax: +44 (0)1743 248600
>> Email antoniogennarini at esinternational.com
>> <http://www.esinternational.com> 
>> Registered in England and Wales number 3212832 
>>
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>
>   


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Jaume Dominguez Faus

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