HI Milo,
There are various initiatives related to Geocoding and it would be good
if could share insights and resources. Some of the projects are:
http://www.pagcgeo.org/
http://www.postgis.org/ - has Tiger based geocoder
http://wiki.osgeo.org/wiki/OpenGeocoder - list some of these and others
http://geocoder.us/
http://www.opengeocoder.net/ - some Microsoft employee
openstreetmap nominatim
The big differences between the various projects are based primarily on
three dimensions:
1. Sources data ie: Tiger only, OpenStreetMap data, any data
2. Language and Geocoding Strategy
3. Licensing
Combining/collabation of efforts really depends a lot of the
compatibility of these dimensions.
Package DataSource(s) Language Licensing
-----------------------------------------------
pagc Multiple C MIT-X
Street segments
parcels
landmarks
------------------------------------------------
postgis Tiger pgpsql GPL2
------------------------------------------------
geocoder.us Tiger Perl Perl
------------------------------------------------
nominatim OSM data ?? ODbl?
-------------------------------------------------
Pagc, postgis geocoder and geocoder.us all started out as Tiger data
based geocoder and have expanded into other realms that use similar
structured data. These projects have more in common with one another
than any of them have with nominatim, unless I am terribly mistaken.
That is not to say we should not collaborate only the data structures
and strategies for querying them are very different.
For example, I just wrote a custom geocoder taking a small amount of
code from pagc and wrapping it into a pgpsql stored procedure and then
wrote a query planner in pgsql to do geocoding. I was able to load 50M
records derived from Tiger, and index them in 6 hrs on a slow 4GB linux
box and can geocode a table 216K addresses in about 44 ms per record.
This is conceptually similar to the processes imployed by the postgis
geocoder and by geocoder.us and for that matter a 2-3 other geocoders
that I have worked with in the past that were not open source, one of
them being a geocoder I wrote that only worked with the old Tiger/Line data.
I have looked at nominatim, a couple of times to try an understand the
process, but it seems to be very tied to the OSM data structures and
infrastructure. So if someone wants to setup a private nominatim service
for a client, they basic need LOTS of iron, LOTS of disk, and need to
mirror much/most?/all? of the OSM infrastructure. And the licensing
needs to be approved by the client.
If I want to create a geocoder that works with Navteq data for a client
that has access to that data, it is pretty easy for me to load the data
into PAGC, or the geocoder I just wrote, or even the postgis or
geocoder.us code with a little massaging of the data. I'm not sure where
I would start with the nominatim code.
OK, I admit that the failure here is my knowledge about Nominatim and/or
maybe that Nominatim/OpenStreetMap are not interested in solving the use
cases that I presented.
Sorry, I have gotten off on a rant. Back to your point about joining
forces, I'm ok with, but I'm not sure where to start. I think I outlined
the problem as I see it, but some additional information related to
Nominatim could help me get beyond my biases if I can see how we can
successfully collaborate.
Best regards,
-Steve
On 12/8/2012 5:19 AM, Milo van der Linden wrote:
Would it be good if opengeocoder joins forces with openstreetmap nominatim?
Op 29 nov. 2012 03:05 schreef "Stephen Woodbridge"
<wood...@swoodbridge.com <mailto:wood...@swoodbridge.com>> het volgende:
On 11/28/2012 7:31 PM, Landon Blake wrote:
I'm in the process of trying to take over as the steward for OSGeo
Labs as part of my duties with the OSGeo Incubation Committee.
As part
of this process I'd like to get a handle on the projects that
are "in"
labs. There is a short list of "stable" and "young and experimental"
projects on the current Labs wiki page. Since I'm editing that page
today, here is the list:
Stable Projects:
- GeoWebCache
- pgRouting
Young and Experimental Projects
- GeoExt
- GeoFunctions
- Geoinformatica
I think these are more or less mine:
- OpenGeocoder
- OpenRouter
There is an OpenGeocoderRouter list that I started but there is no
viable activity on it at this time.
OpenRouter is a project related to internet routing. I started
OpenGraphRouter using a GSoC project to get started. The goal was to
create a routing solution that was MIT-X licensed instead of GPL. We
have sine joined forces with pgRouting and are developing the code
that is MIT-X algorithms, which can be bundled with pgRouting
effectively making them dual licensed.
OpenGeocoder.net appears to be Steve Coast @ Microsoft and not
related to OSGeo stuff.
http://wiki.osgeo.org/wiki/__OpenGeocoder
<http://wiki.osgeo.org/wiki/OpenGeocoder> never got off the ground,
but I have been working with PAGC over the last few years. Our big
issue at the moment is addressing some serious performance issues
when you scale up from county level data sets to national data sets.
Basically it is just me and Walter, the developer, working behind
the scenes on these technical issues. Once these are resolved I hope
to see if we can some activity going again with this.
On a side note, I have take the address standardizer from PAGC,
built it as a library and wrapped it into a postgresql stored
procedure extension. Based on that I have prototyped up a Tiger
geocoder that works very well and is very fast. I'm still work on
various things so it is not ready for prime time but this might
eventually become OpenSource also.
I'm not sure what it means or how you get a project like these "in
labs" but these are mostly orphaned except I have an interest in
them and will respond to queries about them.
Thanks,
-Steve
- Grids
- OSGeo Graphics
- pycsw
- OWSLib
- SemanticGeo
- ZOO-Project
Can you please let me know if you are involved with one of these
projects? I'm trying to determine which projects are "in" labs, and
then establish a point of contact with each project so I can
help them
get ready for official incubation.
Thanks.
Landon
P.S. - If you have thoughts on the purpose and work of OSGeo Labs,
please let me know. I have my own vision, but I'd like to get
feedback
from other OSGeo members.
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