Re: [postgis-users] Determining clusters of points

2011-01-09 Thread Sébastien Lorion
So Emilie and Kevin, what do you think of the results and the new solution I came up with ? Any improvements you would make or comments on why other approaches will not scale as well ? Sébastien On Fri, Jan 7, 2011 at 15:54, Sébastien Lorion wrote: > Happy New Year everyone! > > I got time to te

Re: [postgis-users] Creating density map

2011-01-09 Thread Ben Madin
Aren, You might have more luck on the R-sig-geo list. This looks like a mix of network analysis and point processes - check out pgRouting, or look for routing algorithms check out the sp package and then spatstat, network etc. An approach (by no means the right or even a good one) is to think

[postgis-users] Creating density map

2011-01-09 Thread Aren Cambre
I have three datasets: 1. Routes 2. Event type A that occurs along the routes (points) 3. Event type B that occurs along the routes (points) Both event types have several attributes, including a date/timestamp, sub-classes of each event type, and other meaningful attributes. I'm trying

Re: [postgis-users] How to reproject data with custom projection?

2011-01-09 Thread Aren Cambre
Just want to confirm that it was 3082. Reprojecting from 3082 to 3081 makes it mes well with within my existing data. Thank you so much! Aren On Sun, Jan 9, 2011 at 9:10 PM, Aren Cambre wrote: > Ben and Paul, > > Thank you! > > I didn't know about http://prj2epsg.org. Nice site. > > I was aware

Re: [postgis-users] How to reproject data with custom projection?

2011-01-09 Thread Aren Cambre
Ben and Paul, Thank you! I didn't know about http://prj2epsg.org. Nice site. I was aware of http://spatialreference.org/, but in retrospect I was trying to find an exact match of the entire WKT using that site's search engine and Google. Thanks for the tip about searching on shorter parts. Yeah,