Re: [Talk-us] Available Building Footprints Date: March 28, 2017 at 2:06:33 AM PDT

[Clifford Snow]

On Tue, Mar 28, 2017 at 10:43 AM, Frederik Ramm  wrote:

> This is where I have violently disagreed with Denis and his team in the
> past and still do; in my eyes, the *hard* work starts once the data has
> been prepared and converted and set up, because *then* I want people
> familiar with the area to load the data, compare it with what's there,
> NOT blindly delete what's there, cross-check with aerial imagery and so on.
>

Violently? Really? Actually all parts are equal important. Do a poor job
creating data to be imported will only result in poor data imported into
OSM. Equally important as you point out is the physical import which should
always be more than copy paste.

>
> In my eyes, all the data preparation is peanuts, and the real value is
> added to the import at the upload stage. This is where it is decided
> whether this import will be successful or rubbish. A sad example for a
> rubbish import is almost all of CanVec, which tends to be uploaded by
> people who think that the "hard work" is already done by those who
> prepared the data, and that all that is left for them is hitting the
> upload button in JOSM.
>

Why bring up CanVec?

>
> While a task manager can help, it tends to invite contributions by
> people who are not at all local to the area just to "colour it green".
> This is undesirable in my opinion.
>

I have to disagree with you. Using the Tasking Manager with newer mappers
is a good thing. That's how we build more experience mappers for the
future. If the preparation for the import is done well, newer mappers
should be able to learn how to do a quality import. That newer mapper
learns new tools and gains confidence to be valued contributor. The TM
validation layer then allows us to give feedback to not only the new
mapper, but also back to the originator.

Clifford



-- 
@osm_seattle
osm_seattle.snowandsnow.us
OpenStreetMap: Maps with a human touch
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Re: [Talk-us] Available Building Footprints Date: March 28, 2017 at 2:06:33 AM PDT

[Frederik Ramm]

Hi,

On 03/28/2017 05:48 PM, Denis Carriere wrote:
> Instead of having tons of different people trying to attempt loading all
> of these 8 Million buildings, 

[...]

> After all the "hard work" is done.. you can simply add those
> small chunks of data with JOSM using any Tasking Manager 

This is where I have violently disagreed with Denis and his team in the
past and still do; in my eyes, the *hard* work starts once the data has
been prepared and converted and set up, because *then* I want people
familiar with the area to load the data, compare it with what's there,
NOT blindly delete what's there, cross-check with aerial imagery and so on.

In my eyes, all the data preparation is peanuts, and the real value is
added to the import at the upload stage. This is where it is decided
whether this import will be successful or rubbish. A sad example for a
rubbish import is almost all of CanVec, which tends to be uploaded by
people who think that the "hard work" is already done by those who
prepared the data, and that all that is left for them is hitting the
upload button in JOSM.

While a task manager can help, it tends to invite contributions by
people who are not at all local to the area just to "colour it green".
This is undesirable in my opinion.

Bye
Frederik

-- 
Frederik Ramm  ##  eMail frede...@remote.org  ##  N49°00'09" E008°23'33"

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Re: [Talk-us] Available Building Footprints Date: March 28, 2017 at 2:06:33 AM PDT

[Denis Carriere]

Instead of having tons of different people trying to attempt loading all of
these 8 Million buildings, we shoul collectively start an import proposal
(OSM wiki, draft a plan, set up tasking managers, pre-process data, host
entire dataset, etc...).

The best/easiest solution we (OSM Ottawa) did for importing 1M+ buildings
was to convert the data into GeoJSON and then convert them into VectorTiles
using Tippecanoe [0] and host them using our own custom server (Micro Data
Service [1]) which hosts those vector tiles into OSM & GeoJSON. After all
the "hard work" is done.. you can simply add those small chunks of data
with JOSM using any Tasking Manager by adding the URL [2] in Extra
Instructions. An example of a final OSM tile would look like this [3] which
would be ready to import (semi-manually).

There's also integration with QA-Tiles [4] to prevent loading any duplicate
data (this feature requires continuously loading the most current QA-Tile
during the import process).

*Summary: *Before anyone attempts to import this data, we need to create a
plan first. I'm more than willing to help out, but this would be a large
task and would need to be done collectively as a group.

[0] https://github.com/mapbox/tippecanoe
[1] https://github.com/osmottawa/micro-data-service
[2]
http://localhost:8111/import?new_layer=true=https://data.osmcanada.ca/{z}/{x}/{y}/ottawa-buildings.osm
[3] https://data.osmcanada.com/15/9478/21019/ottawa-buildings.osm
[4] https://osmlab.github.io/osm-qa-tiles/

*~~*
*Denis Carriere*
*GIS Software & Systems Specialist*

On Tue, Mar 28, 2017 at 11:00 AM, OSM Volunteer stevea <
stevea...@softworkers.com> wrote:

> Hi Nathan:
>
> I've got pretty beefy hardware, but the "Bay Area" shapefile pointed to by
> your recent post chokes my JOSM to a gasping strangle:  >3.7 million
> objects?!  These need to be broken up further to smaller files, to either
> the county level or even smaller to a sub-county level, in a sane way.  You
> may as well save them as .osm files (and host them on some other place
> besides a Microsoft cloud), as shapefiles still remain a "foreign" (though
> importable) format within OSM.
>
> SteveA
> California
>
>
> > On Mar 28, 2017, at 5:00 AM, talk-us-requ...@openstreetmap.org wrote:
> >
> > https://wiki.openstreetmap.org/wiki/Available_Building_Footprints
>
>
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Re: [Talk-us] Available Building Footprints Date: March 28, 2017 at 2:06:33 AM PDT

[OSM Volunteer stevea]

Hi Nathan:

I've got pretty beefy hardware, but the "Bay Area" shapefile pointed to by your 
recent post chokes my JOSM to a gasping strangle:  >3.7 million objects?!  
These need to be broken up further to smaller files, to either the county level 
or even smaller to a sub-county level, in a sane way.  You may as well save 
them as .osm files (and host them on some other place besides a Microsoft 
cloud), as shapefiles still remain a "foreign" (though importable) format 
within OSM.

SteveA
California


> On Mar 28, 2017, at 5:00 AM, talk-us-requ...@openstreetmap.org wrote:
> 
> https://wiki.openstreetmap.org/wiki/Available_Building_Footprints


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