Hi -Jonah
The data as you say is collected from various sources. Looking at the forms, it
seem that outbounds were not traced by hand but either by some computer tool
that interpret pixels. If you look around building
We dont know how the producer proceeded to trace buildings outlindes from
imagery.
Bing offers good quality image for the area but probably less recent then the
imagery used to trace the buildings as provided in the file. The outbounds in
the Import File that you provided on Github are often imprecise, do not fit
closely with what we observe on Bing Imagery (ie. angles where we dont see any,
smaller size, etc). And this not only where trees obscure part of buildings.
From Bing, we observe in general orthogonal angles (ie. closed to 90 degrees).
But this is often not the case in the Import file.
Look for example around building id=-1207029
Pierre
Le samedi 15 juin 2019 18 h 28 min 08 s UTC−4, Jonah Adkins
<[email protected]> a écrit :
Hi Pierre, Thanks for taking a look.
The source data for this import is not AI derived - the state GIS office (VGIN)
collects datasets from each city/county in Virginia, then processes them into a
statewide dataset that is released (with a OSM compatible license) on a
quarterly basis.
Was there a particular area in the full or sample OSM files that looked bad?
Thx-Jonah
On Jun 15, 2019, at 5:06 PM, Pierre Béland <[email protected]> wrote:
Hi Jonah
Footprints derived from AI Tools often have difficulty to interpret imagery in
particular where there are obstacles such as trees. This seems to be the case
here. Do you have any plan to evaluate the accuracy of footprints and
correction to make if necessary?
Pierre
Le jeudi 13 juin 2019 23 h 57 min 04 s UTC−4, Jonah Adkins
<[email protected]> a écrit :
Hey OSM,
I'd like to propose an import of GIS data for Portsmouth, Virginia. The source
data is provided by the State of Virginia via the Virginia Geographic
Information Network (VGIN) under a compatible license for import. There’s
around 49,000 buildings, most of which include an address and building type.
This import has been discussed on the OSM Slack Virginia channel with
pre-review of the available sample data and I anticipate local mapper support
with the import process. Conflation with existing OSM data will happen during
the import.
For more information and a sample OSM file, see:
Github -> https://github.com/jonahadkins/portsmouth-osm-imports
Wiki ->
https://wiki.openstreetmap.org/wiki/City_of_Portsmouth_Buildings/Address_Import
This message has been cross-posted in Talk-US, Imports-US, & Imports.
Also please rememberer SOTMUS is around the corner - talks, scholarships and
more! -> https://2019.stateofthemap.us
Thanks,
Jonah
jonahadkins.com
_______________________________________________
Imports mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/imports
_______________________________________________
Imports mailing list
[email protected]
https://lists.openstreetmap.org/listinfo/imports
