[GRASS-user] SQLite Error

Mark Wynter mark at dimensionaledge.com
Thu Feb 12 14:03:52 PST 2015


Thanks Moritz - good suggestion - I  just need to these as deliverables out to 2 separate clients (nice to get paid work for this stuff) - then I will write up and contribute back via Wiki.

>> 
>> The slow rate of writing out the v.net.allpair results from
>> PostgreSQL was due to the sheer volume of line strings, as the number
>> of pairs increased (n^2).  Simple math said stop.   I’ve since
>> changed my approach and am using v.net.distance in a novel way where
>> the to_cat is the origin, and the from_cat is a string of
>> destinations - this is an equivalent way of generating multiple
>> v.net.paths in a single operation.  Moreover, I’m feeding each origin
>> - destination collection into GNU Parallel as a separate job, so it
>> rips through the data at scale!
> 
> It would be great if you could put this info in a more structured form onto the GRASS wiki, possibly as a FAQ.
> 
> Moritz



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