The offset is to get you on the right side of the street, not to compensate for the fuzzyness of census data. Not sure if that was clear. The census data are all street centerlines, and what the offset is intended to do is this Say your road looks like this: 0 24 30 ----------------------------------- 1 25 31 Say lets say your street address is like 25 State street, the interpolation would put you on the centerline of the line corresponding to 24/25 But since we know you are 25 -- the 10 offset pushes the point to hit the 25 (so 10 meters) in the 25 direction So the offset should be more accurate than without as it would put you on the correct side of the road instead of standing in the middle of it.
_____ From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Chris English Sent: Sunday, September 16, 2012 9:14 AM To: postgis_users Subject: Re: [postgis-users] Odd question But changing the setting to zero doesn't get one necessarily closer to the true location of the address, does it? It remains fuzzy as was the intent of the census bureau to elide. Chris _____ Date: Sat, 15 Sep 2012 18:46:06 -0500 From: ericas...@gmail.com To: postgis-users@postgis.refractions.net Subject: Re: [postgis-users] Odd question That's fantastic! Exactly what I was looking for. Thank you very much. On Sat, Sep 15, 2012 at 6:44 PM, Paragon Corporation <l...@pcorp.us> wrote: Eric, Did y ou want to change the default or set it to 0 or something? We were meaning to expose that but wasn't sure if anyone would be interested in changing it. The setting is on the function: interpolate_from_address Just change the hardcoded default of 10 to what you want. CREATE OR REPLACE FUNCTION interpolate_from_address(given_address INTEGER, in_addr1 VARCHAR, in_addr2 VARCHAR, in_road GEOMETRY, in_side VARCHAR DEFAULT '',in_offset_m float DEFAULT 10 ); In 2.1. we'll add to the list to allow this to be voerrided at the geocode function level as an additional arg. Can't do that with the 2.0 one though since that would change the api. Hope that helps, Regina http://www.postgis.us -----Original Message----- From: postgis-users-boun...@postgis.refractions.net [mailto:postgis-users-boun...@postgis.refractions.net] On Behalf Of Eric Aspengren Sent: Saturday, September 15, 2012 5:20 PM To: PostGIS Users Discussion Subject: [postgis-users] Odd question Anybody know how to remove the default 10 meter offset from the PostGIS geocoder? -- Eric Aspengren (402) 478-8683 www.streetlevelstrategies.com ericas...@gmail.com _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users -- Eric Aspengren (402) 478-8683 www.streetlevelstrategies.com ericas...@gmail.com _______________________________________________ postgis-users mailing list postgis-users@postgis.refractions.net http://postgis.refractions.net/mailman/listinfo/postgis-users
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