[GRASSLIST:10263] Re: gismlegend.txt problem

[Michael Barton]

Peter,

This is not a problem with v.what, but is a function of the way queries
interact with displays in general.

D.vect *displays* vector objects, but does not create a subset of vector
objects. When you include an SQL statement in d.vect, it can limit what is
*displayed* to the screen, but does not change the fact that other vector
objects still exist. They simply are not visible.

The query modules (including both d.what.vect and v.what) will list
information about vector objects that exist (i.e., georeferenced by
topology) at a particular xy location. D.what.vect acquires its xy location
by clicking on an xmonitor and while the user (or GUI) must supply xy
locations to v.what.

So the query modules will always give you information on whatever vector
objects exist at an xy location, whether or not they are visible or hidden
by d.vect.

To actually subset a vector file--so that any subsequent query will ONLY
find vector objects in that subset--you need to use v.extract or v.select.
These create a new vector file containing ONLY the desired objects.

Conceptually, the same thing goes for raster files.

I hope that this better explains how display and querying interact in GRASS.

Michael
__________________________________________
Michael Barton, Professor of Anthropology
School of Human Evolution and Social Change
Arizona State University
Tempe, AZ 85287-2402

phone: 480-965-6213
fax: 480-965-7671
www: http://www.public.asu.edu/~cmbarton



> From: "Ing.Peter Misovic" <peter.misovic at gmail.com>
> Date: Sat, 11 Feb 2006 13:49:11 +0100
> To: Michael Barton <michael.barton at asu.edu>
> Cc: Multiple recipients of list <GRASSLIST at baylor.edu>
> Subject: Re: [GRASSLIST:10232] gismlegend.txt problem
> 
> Hi Michael,
> we have found some issue with v.what in Map Display window (new GM).
> What is the problem ? I don't know, how the SQL WHERE STATMETS works,
> but I think, It's just setting backgroud color to don't matching
> records. And because of v.what script is based on coordinates imput it
> returns records info even if I apply sql statment (because as I said,
> maybe it only changes color of element). In other words, If I apply
> sql statment and after that I click for info in Map Display it will
> return information for nonvisible elements.
> 
> Would you be so kind to help me with that issue ? I hope, I've
> described it in understable way.
> 
> Peter
> 
> 
> 
> 
> On 2/11/06, Ing.Peter Misovic <peter.misovic at gmail.com> wrote:
>> Hi,
>> I'm already done with CVS installation. Everything seems to be ok
>> except one thing. I've attached error snapshot (I was clicled on
>> thematic group and if I clicked for info in Monitor)
>> 
>> 
>> Peter
>> 
>> On 2/11/06, Michael Barton <michael.barton at asu.edu> wrote:
>>> You should already have v.univar.sh in a normal GRASS distribution. However,
>>> it looks like you needed the new d.vect.thematic.
>>> 
>>> You are also correct that you need to install v.what if you want to do
>>> vector querying.
>>> 
>>> These steps are listed in the README file that accompanies the version of
>>> the GIS Manager that comes from my web site. All the appropriate files
>>> should also be in the cvs.
>>> 
>>> Let me know if they are not.
>>> 
>>> Glad it is working.
>>> 
>>> Michael
>>> ______________________________
>>> Michael Barton, Professor of Anthropology
>>> School of Human Evolution and Social Change
>>> Arizona State University
>>> Tempe, AZ  85287-2402
>>> USA
>>> 
>>> voice: 480-965-6262; fax: 480-965-7671
>>> www: http://www.public.asu.edu/~cmbarton
>>> 
>>> 
>>>> From: "Ing.Peter Misovic" <peter.misovic at gmail.com>
>>>> Date: Sat, 11 Feb 2006 00:11:32 +0100
>>>> To: Michael Barton <michael.barton at asu.edu>
>>>> Cc: Multiple recipients of list <GRASSLIST at baylor.edu>
>>>> Subject: Re: [GRASSLIST:10232] gismlegend.txt problem
>>>> 
>>>> Hi again ;)
>>>> the problem was soleved by following way (maybe it can help somebody):
>>>> a.) Download thematic.tgz from
>>>> http://www.public.asu.edu/~cmbarton/files/grass_scripts/
>>>> b.) copy d.vect.thematic and v.univar.sh into (grass dir/scripts)
>>>> c.) manually create gismlegend.txt in you default directory
>>>> 
>>>> My fault was that I did not copy v.univar.sh into scripts folder.
>>>> 
>>>> This is how I installed v.what. Maybe, it could help somebody.
>>>> a.) download gism_rc2_20060206.tgz from
>>>> http://www.public.asu.edu/%7Ecmbarton/files/grass_gismgr/ - package
>>>> contains new Gis Manager and new v.what script. First of all, create
>>>> folder v.what in (unTARed folder with grass sources)/vector/ and copy
>>>> all files from v.what/source/v.what.tar.gz into this new folder.
>>>> b.) run ./configure as you need, then make (as normal user)
>>>> c.) go into vector/v.what folder and run make
>>>> d.) do #make install (as root)
>>>> 
>>>> 
>>>> Peter
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On 2/10/06, Ing.Peter Misovic <peter.misovic at gmail.com> wrote:
>>>>> Hi Michael again,
>>>>> the problem is that d.vect.thematic is not creating this file anymore.
>>>>> If I create this file by my own (in my default directory)
>>>>> d.vect.thematic is not terminated abnormally. Even though that fact,
>>>>> the file has Ob size and GIS Monitor displays nothing at all.
>>>>> 
>>>>> Thank you for you help,
>>>>> 
>>>>> Peter
>>>>> 
>>>>> On 2/10/06, Michael Barton <michael.barton at asu.edu> wrote:
>>>>>> This problem may happen to other people.
>>>>>> 
>>>>>> In order to make a legend in the new GIS Manager,  must
>>>>>> create a text file containing legend parameters and give it a name that
>>>>>> gism
>>>>>> can recognize. So, I've had d.vect.thematic write these out to a file
>>>>>> named
>>>>>> gismlegend.txt in the user's default directory (usually the home
>>>>>> directory).
>>>>>> If you cannot write to your default directory--whatever it
>>>>>> is--gismlegend.txt won't get written and the GIS Manager won't find it.
>>>>>> 
>>>>>> See if you are getting this file written into your default directory. If
>>>>>> not, try making sure the permissions are set to let you write in the
>>>>>> directory.
>>>>>> 
>>>>>> Michael
>>>>>> __________________________________________
>>>>>> Michael Barton, Professor of Anthropology
>>>>>> School of Human Evolution and Social Change
>>>>>> Arizona State University
>>>>>> Tempe, AZ 85287-2402
>>>>>> 
>>>>>> phone: 480-965-6213
>>>>>> fax: 480-965-7671
>>>>>> www: http://www.public.asu.edu/~cmbarton
>>>>>> 
>>>>>> 
>>>>>> 
>>>>>>> From: "Ing.Peter Misovic" <peter.misovic at gmail.com>
>>>>>>> Date: Thu, 9 Feb 2006 23:35:42 +0100
>>>>>>> To: grass list <GRASSLIST at baylor.edu>
>>>>>>> Subject: [GRASSLIST:10232] gismlegend.txt problem
>>>>>>> 
>>>>>>> Dear all,
>>>>>>> I have problem in GM2 during following process:
>>>>>>> a.) open d.vect.thematic
>>>>>>> b.) setting of all related parameters
>>>>>>> c.) switch to grass monitor
>>>>>>> d.) click on redraw icon (top-left)
>>>>>>> d.) error occuring : couldn't open "gismlegend.txt": no such file or
>>>>>>> directory
>>>>>>> 
>>>>>>> Thank you,
>>>>>>> Peter
>>>>>> 
>>>>>> 
>>>>> 
>>> 
>>> 
>> 
>> 
>>