[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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