[Talk-us-massachusetts] Talk-us-massachusetts Digest, Vol 75, Issue 2

Wed Nov 15 14:01:12 UTC 2023

Very cool! I wonder how they will keep it updated. 
Ken

Sent from my iPhone

> On Nov 15, 2023, at 7:03 AM, talk-us-massachusetts-request at openstreetmap.org wrote:
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> Today's Topics:
> 
>   1. New MassGIS Trails data (Peter Cooper Jr.)
>   2. Re: New MassGIS Trails data (Greg Troxel)
>   3. Re: New MassGIS Trails data (Tom Parent)
>   4. Re: New MassGIS Trails data (Greg Troxel)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Tue, 14 Nov 2023 15:24:23 -0500
> From: "Peter Cooper Jr."
>    <pete-openstreetmap-massachusetts-list at cooperjr.name>
> To: talk-us-massachusetts at openstreetmap.org
> Subject: [Talk-us-massachusetts] New MassGIS Trails data
> Message-ID: <ed7da8e6-3a3c-407e-b095-edf21c222530 at cooperjr.name>
> Content-Type: text/plain; charset=UTF-8; format=flowed
> 
> So MassGIS just released their newsletter, and there was something in it
> that caught my eye and I thought others might be interested in too. They
> have a comprehensive "Trails" data set available now, which combines
> data from several sources (including OpenStreetMap!) into one place,
> which all is to somehow feed into the system 911 dispatchers use when
> finding people in the wilderness.
> 
> https://www.mass.gov/info-details/massgis-data-hiking-trails-for-nextgen-911
> https://massgis.maps.arcgis.com/home/item.html?id=c1c31142e2664fc5bc43c50ecb942f27
> https://hub.arcgis.com/datasets/massgis::massachusetts-hiking-and-wilderness-trails/about
> 
> Complete GeoJSON dump:
> https://opendata.arcgis.com/datasets/c1c31142e2664fc5bc43c50ecb942f27_0.geojson
> 
> I'm not sure how much of this could be used to improve OpenStreetMap,
> but it's neat to see the work I've done mapping some trails end up
> actually being useful to 911 operators.
> 
> And have a happy GIS Day tomorrow! https://www.mass.gov/gis-day-2023
> 
> 
> 
> 
> ------------------------------
> 
> Message: 2
> Date: Tue, 14 Nov 2023 15:36:50 -0500
> From: Greg Troxel <gdt at lexort.com>
> To: "Peter Cooper Jr. via Talk-us-massachusetts"
>    <talk-us-massachusetts at openstreetmap.org>
> Subject: Re: [Talk-us-massachusetts] New MassGIS Trails data
> Message-ID: <rmicywcax7h.fsf at s1.lexort.com>
> Content-Type: text/plain
> 
> "Peter Cooper Jr. via Talk-us-massachusetts"
> <talk-us-massachusetts at openstreetmap.org> writes:
> 
>> So MassGIS just released their newsletter, and there was something in
>> it that caught my eye and I thought others might be interested in
>> too. They have a comprehensive "Trails" data set available now, which
>> combines data from several sources (including OpenStreetMap!) into one
>> place, which all is to somehow feed into the system 911 dispatchers
>> use when finding people in the wilderness.
> 
> I have heard of that earlier but not had time to dig in.  It's really
> not clear what they've done, and what the licensing is of the combined
> dataaset.  It really has to be ODbL, but doesn't really seem like that.
> 
>> I'm not sure how much of this could be used to improve OpenStreetMap,
>> but it's neat to see the work I've done mapping some trails end up
>> actually being useful to 911 operators.
> 
> I doubt it is useful as the previous MassGIS trails data seemed not
> accurate when I looked at it.  And given the licensing issue, we'd have
> to figure out where there rest of the data came from and what it's terms
> were.
> 
> But yes, it is very cool to see OSM trail data in use at PSAPs.
> 
> 
> 
> ------------------------------
> 
> Message: 3
> Date: Tue, 14 Nov 2023 15:41:04 -0500
> From: Tom Parent <tomparent at gmail.com>
> To: "Peter Cooper Jr."
>    <pete-openstreetmap-massachusetts-list at cooperjr.name>
> Cc: talk-us-massachusetts at openstreetmap.org
> Subject: Re: [Talk-us-massachusetts] New MassGIS Trails data
> Message-ID:
>    <CAARZOPeMbEcZ2P-RWfJoA=HEiVGWpouqEHUzdnGWpKNaG5nqCA at mail.gmail.com>
> Content-Type: text/plain; charset="utf-8"
> 
> I applaud that they created this layer.  However, some things are wrong or
> out of date after a brief look.  I updated/removed (due to closure) some
> trails near me >6 months ago and they have not been updated in MassGIS
> data.  I'm curious about the frequency of updates.
> 
> I'm also curious about what type of vetting they're doing on imported OSM
> data.  As everyone knows, there is a lot of bad data in OSM.  We (OSM
> community) are familiar with this because it's a part of crowdsourcing data
> from the masses with various levels of experience (and intent) and treat it
> accordingly.  However, when brought into an (authoritative) MassGIS
> dataset, presumably there is/should be a higher bar for things being
> vetted/correct(?)
> 
>> On Tue, Nov 14, 2023 at 3:26?PM Peter Cooper Jr. via Talk-us-massachusetts <
>> talk-us-massachusetts at openstreetmap.org> wrote:
>> 
>> So MassGIS just released their newsletter, and there was something in it
>> that caught my eye and I thought others might be interested in too. They
>> have a comprehensive "Trails" data set available now, which combines
>> data from several sources (including OpenStreetMap!) into one place,
>> which all is to somehow feed into the system 911 dispatchers use when
>> finding people in the wilderness.
>> 
>> 
>> https://www.mass.gov/info-details/massgis-data-hiking-trails-for-nextgen-911
>> 
>> https://massgis.maps.arcgis.com/home/item.html?id=c1c31142e2664fc5bc43c50ecb942f27
>> 
>> https://hub.arcgis.com/datasets/massgis::massachusetts-hiking-and-wilderness-trails/about
>> 
>> Complete GeoJSON dump:
>> 
>> https://opendata.arcgis.com/datasets/c1c31142e2664fc5bc43c50ecb942f27_0.geojson
>> 
>> I'm not sure how much of this could be used to improve OpenStreetMap,
>> but it's neat to see the work I've done mapping some trails end up
>> actually being useful to 911 operators.
>> 
>> And have a happy GIS Day tomorrow! https://www.mass.gov/gis-day-2023
>> 
>> 
>> _______________________________________________
>> Talk-us-massachusetts mailing list
>> Talk-us-massachusetts at openstreetmap.org
>> https://lists.openstreetmap.org/listinfo/talk-us-massachusetts
>> 
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> ------------------------------
> 
> Message: 4
> Date: Tue, 14 Nov 2023 18:08:31 -0500
> From: Greg Troxel <gdt at lexort.com>
> To: Tom Parent <tomparent at gmail.com>
> Cc: "Peter Cooper Jr."
>    <pete-openstreetmap-massachusetts-list at cooperjr.name>,
>    talk-us-massachusetts at openstreetmap.org
> Subject: Re: [Talk-us-massachusetts] New MassGIS Trails data
> Message-ID: <rmi1qcsaq6o.fsf at s1.lexort.com>
> Content-Type: text/plain
> 
> Tom Parent <tomparent at gmail.com> writes:
> 
>> I applaud that they created this layer.  However, some things are wrong or
>> out of date after a brief look.  I updated/removed (due to closure) some
>> trails near me >6 months ago and they have not been updated in MassGIS
>> data.  I'm curious about the frequency of updates.
> 
> It would not surprise me if it were manual and occasional.
> 
>> I'm also curious about what type of vetting they're doing on imported OSM
>> data.  As everyone knows, there is a lot of bad data in OSM.  We (OSM
>> community) are familiar with this because it's a part of crowdsourcing data
>> from the masses with various levels of experience (and intent) and treat it
>> accordingly.  However, when brought into an (authoritative) MassGIS
>> dataset, presumably there is/should be a higher bar for things being
>> vetted/correct(?)
> 
> There is a difference between being formally authoritative and being
> accurate.  I have looked at previous MassGIS trails layers and they have
> been much worse than OSM in my town.  Now, that is true because I have
> made the data correct in OSM.  But still, the layer did not have
> published accuracy standards, like 99% of trail segments in the map
> actually exist, and 80% of segments that exist on the ground are in the
> map, and that when there is a matching data segment, that 95% of points
> on the map are within 10m of where the trail really is.  Just
> articulating an example points out how far away the data is from
> accurate.  (The USGS topo maps used to have at least some such
> statements.)
> 
> Overall, I find OSM to be much more accurate than any other statewide
> dataset for trails, by a very wide margin.
> Counterexamples most welcome of course.
> 
> 
> 
> ------------------------------
> 
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> ------------------------------
> 
> End of Talk-us-massachusetts Digest, Vol 75, Issue 2
> ****************************************************