At 2012-03-15 06:27, Mike N wrote:
On 3/15/2012 8:52 AM, Hillsman, Edward wrote:
In the interest of figuring out how to attract more people to participate
in OSM, I'd like to see some more discussion of this. Is it generally
true that people who work on OSM don't like to map subdivisions? And, if
so, why? Because these are home to so many people in the US, it raises a
question about the viability of strategies that suggest people start in
OSM by mapping their own neighborhoods.
I don't know anything about this specifically. It's interesting that
not a single person in those 120 subdivisions was interested in mapping
their own subdivision.
Assuming we're talking about the US, not really surprising. I've mapped
hundreds of subdivisions in southern Cal. In particular, dozens of them
were not on the map at all, having been developed after TIGER's 2005 source
date. Some were not even on Google Maps, so you'd think someone out there
other than me would have wanted to map them.
I have done some onsite surveys of smaller subdivisions (100-400
homes), and can set this up with a camera, video cam, and bike to
collect quite a lot of information in a single visit, and the end result
is streets with lanes, speed limits, one ways, and house numbers.
Yup - me too, with a car, GPS, and a digital camera.
In this area, since no one else is participating[1], it's just a
practical matter to create the base new subdivision information from
TIGER since the local governments don't freely give this
information. The only followup surveys are quick to clarify obvious
errors in the TIGER data.
The subdivision plat idea is new to me, but I'm not sure where I'd find them.
I've recently done this when I see an area that really is untouched. I
first make sure that all the ways are the original TIGER ways
("tiger:cfcc"=* ((version:1 user:DaveHansenTiger) | (version:2
user:balrog-kun))), remove them, then convert and transplant in new
TIGER2011 data, connecting it to existing ways at the borders.
BTW, many (most IME) county governments have at least some data available
for free. Assessor's maps are generally more available, though keep in mind
that they are less authoritative on naming than tract/parcel maps because
the assessor's role is more related to the land parcels than the streets
between them. Tract/parcel maps, records of surveys, roadbooks, etc. are
generally available from the planning and/or public works departments.
While they are usually filed with the county recorder, that avenue is
usually not free. All it takes is a little digging. If you run into a
fee-required situation, don't be afraid to ask for a waiver, describing OSM
and your need to use them as a reference. That's worked for me.
--
Alan Mintz <[email protected]>
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