[GRASS-dev] [bug #3877] (grass) r.to.vect, v.in.ascii use too much memory for millions of points

[Helena Mitasova]

Markus Neteler wrote:
> Helena Mitasova wrote on 07/07/2006 04:27 PM:
>   
>> On Jul 7, 2006, at 7:48 AM, Markus Neteler wrote:
>>     
>>> Hamish wrote on 07/07/2006 10:19 AM:
>>>       
>>>> I was never very clear on this, but have an idea that topology is
>>>> meaningless for data which is only points (no tree; only bounding box
>>>> matters?). If so, the (correct) solution becomes much easier.
>>>>
>>>>         
>>> ... nor me.
>>> *If* topology is meaningless for point data, then we could add a test
>>> in Vect_built() to
>>> - check if only points are present in the map,
>>> - if so, skip the topology creation.
>>>       
>> this is not generaly a good solution - I will get back to this when I
>> have more time -
>> it is good to read Radims document about what to do with the vector
>> format
>> first before further engaging in this discussion - Maciek please read
>> it -
>> that will give you a better idea what is going on.
>>     
>
> This is certainly a good idea. May I suggest that someone picks all the
> pieces from the various (Radim et al.) emails and creates a Wiki page out
> of that?
>   
Markus - the better way would be to add the document that he has written 
about the next step
to do with vector support as a reference into
http://mpa.itc.it/markus/grass61progman/Vector_Library.html
he has identified scalability as a main issue for vector support and 
suggests some solutions
(I believe it is the building of spatial index that is needed for 
topology building but potentially for
other things that needs to be modified - but I really don't want to go 
into this without reading it again).
As for the emails - most of it is just repeating the same thing over and 
over (I am starting
to be like Radim), although I have posted Radim's suggestion on how to 
modify
v.info and v.to.rast that has not been implemented yet and that might be 
useful (maybe add it to Radim's document)

Helena
> thanks
>  Markus
>
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-- 
Helena Mitasova
Department of Marine, Earth and Atmospheric Sciences
North Carolina State University
1125 Jordan Hall
NCSU Box 8208
Raleigh, NC 27695-8208
http://skagit.meas.ncsu.edu/~helena/

email: hmitaso at unity.ncsu.edu
ph: 919-513-1327 (no voicemail)
fax 919 515-7802