On 17/09/2020 10.07, Shawn K. Quinn wrote:
On 9/17/20 08:15, Matthew Woehlke wrote:
It's also atrocious because it can *only* be verified by survey. As
much as we prefer surveys, the reality is that a lot of mapping
happens just from aerials, where crossings (both marked and, in some
cases, unmarked) can be seen, but signals cannot.
I have mapped many traffic signals (and, for that matter, stop and yield
signs) based on shadows visible on the satellite photos. If you look
carefully enough (Bing and Mapbox Satellite at least), they are there.
(Local knowledge helps too in some cases.)
*Traffic* lights I can buy. I am more suspicious of the claim that you
can tell whether they have pedestrian crossing signals or not, or that
you can reliably identify other signage based solely on outline. *Maybe*
if you get lucky and have a very clear shadow at the right angle, but if
you try to tell me you can identify
https://www.openstreetmap.org/node/7695704414 (n.b. a yield sign) from a
shadow in aerial imagery, I am going to be deeply suspicious ;-).
--
Matthew
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