[Talk-us] Night of the Living Maps
rwelty at averillpark.net
Fri Oct 26 01:46:13 GMT 2012
On 10/25/12 9:14 PM, Mike N wrote:
> On 10/25/2012 12:34 PM, Martijn van Exel wrote:
>> talking about promoting a US project like fixing TIGER deserts / Ghost
>> towns for the next NOTLM (date to be set). Good idea?
> I would say that this is a good idea. If a curious person (non-OSM
> contributor) were to look at a garbled set of TIGER streets, they
> might not even start with basic contributions such as verifying the
> streets where they live and work, or adding POI. Learning how to
> correct those TIGER streets would be a huge obstacle.
> So my input would be to find not only TIGER deserts, but those which
> appear to have been created from GPSs carried before the GPS signals
> were unscrambled. Generally, these were entire counties. Some of
> the TIGER datasets have been updated to current technology standards.
> Detecting this could be by comparing the alignment of unedited OSM to
> latest TIGER.
> Otherwise, I'm not sure how to tell if a TIGER desert was good to
> begin with, or just never touched as well as being far out of alignment.
i don't think that any TIGER desert is really trustworthy. i've done
TIGER review of much of the Capital District
of New York, and while street alignment is usually tolerable, there's a
persistent error rate, mostly things
that are only really detectable by a ground survey.
however, there are vast areas (like most if not all of WV) where the
alignment of TIGER 2005 is really
awful, and TIGER 2011/2012 is a significant improvement. since the
latter is available as an image
layer which i know works with JOSM and i understand works with Potlatch,
it's pretty reasonable to
load up a spot in the desert and compare unedited data with 2011/2012
and realign. just don't remove
the reviewed tag, that shouldn't be done without a ground survey.
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