[Gvsig_english] querying a shapefile

[Nik Go]

My apologies for the oversight. I asked the same question from the
Quantum GIS mailing list, and I forgot to edit the question. My bad.

Thank you, Simon for answering. I will look into the requirements of
the new version and see if I could compile Java without trashing my
system. Would you have any tips for a 64-bit Ubuntu user on getting
this done?

On 1/12/10, Simon Cropper (Botanicus Australia Pty Ltd)
<scropper at botanicusaustralia.com.au> wrote:
> Nik,
>
> This is the mailserver for gvSIG not QGIS.
>
> That said, QGIS has the ability to establish distances between polygons.
> Look in the [Main Menu] [Vector] [Analysis Tools] [Distance matrix]...
>
> gvSIG + Sextante also has the ability to make a matrix -- city name
> along column and row with intersecting cell containing minimum distance.
>
> The latest version of Sextante (the one a lot of people are having
> trouble setting up at the moment) has a tool called "distance and angle"
> this may also help.
>
> Recently I had a need to establish the distance between polygons/points
> with the output being Unique ID1, Unique ID2, Distance, Bearing, etc...
> That is, one row per comparison.
>
> I received help from Nacho Uve who can be contacted on the Sextante
> Mailserver. He is developing a routine called CartTools. The Beta
> version of this program worked really well -- the only problem was that
> when comparing two polygons that were the same (zero distance) the
> bearing and angle output were returned as 90° and 0° respectively when
> it should actually return an error or warning (i.e. these values are not
> applicable and should not be returned).
>
> In this format it is simply a matter of applying the 'x' and 'y'
> attribute for each city and you have your answer.
>
> Nacho has submitted his routine to the Sextante source code repository
> http://forge.osor.eu/plugins/scmsvn/viewcvs.php/soft/sextante_lib/vectorTools/src/es/unex/sextante/vectorTools/distanceAndAngle/DistanceAndAngleAlgorithm.java?root=sextante&view=markup
> <http://forge.osor.eu/plugins/scmsvn/viewcvs.php/soft/sextante_lib/vectorTools/src/es/unex/sextante/vectorTools/distanceAndAngle/DistanceAndAngleAlgorithm.java?root=sextante&view=markup>.
> If you can compile java you will have no problem.
>
> Cheers Simon
>
> Simon Cropper
> Botanicus Australia Pty Ltd
> PO Box 160, Sunshine, Victoria 3020.
> P: 9311 5822. M: 041 830 3437.
> mailto: scropper at botanicusaustralia.com.au
> <mailto:scropper at botanicusaustralia.com.au>
> web: www.botanicusaustralia.com.au <http://www.botanicusaustralia.com.au>
>
>
> On 12/01/2010 5:11 AM, Nik Go wrote:
>> Hello. Happy new year to all.
>>
>> I have a shapefile of cities, is it possible to do the following in QGIS
>>
>>     * determine and visually display all cities with attribute "x" or "y"
>>     * find out if the "x" cities share a border with other "x" cities
>>           o if they do, I want to add an attribute to the database
>>             indicating it as a neighbor of another "x" city
>>     * find out if the "y" cities share a border with other "y" cities
>>           o if they do, I want to add an attribute to the database
>>             indicating it as a neighbor of another "y" city
>>
>> Thank you and regards.
>>
>> Nik
>>
>>
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