[postgis-users] Odd question

[Chris English]

Thank you, now perfectly clear.

From: lr at pcorp.us
To: postgis-users at postgis.refractions.net
Date: Mon, 17 Sep 2012 00:35:16 -0400
Subject: Re: [postgis-users] Odd question








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-bounces at postgis.refractions.net 
[mailto:postgis-users-bounces at 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: ericaspen at gmail.com
To: 
postgis-users at 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 
<lr at 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-bounces at postgis.refractions.net
[mailto:postgis-users-bounces at 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
ericaspen at gmail.com



_______________________________________________
postgis-users 
  mailing list
postgis-users at postgis.refractions.net
http://postgis.refractions.net/mailman/listinfo/postgis-users



-- 
Eric Aspengren
(402) 478-8683
www.streetlevelstrategies.com
ericaspen at gmail.com

_______________________________________________ 
postgis-users mailing list postgis-users at postgis.refractions.net 
http://postgis.refractions.net/mailman/listinfo/postgis-users

_______________________________________________
postgis-users mailing list
postgis-users at postgis.refractions.net
http://postgis.refractions.net/mailman/listinfo/postgis-users 		 	   		  
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://lists.osgeo.org/pipermail/postgis-users/attachments/20120917/365a1bde/attachment.html>