[Talk-us-massachusetts] 2015 ortho licensing, thank-you text
Greg Troxel
gdt at lexort.com
Thu Jan 7 13:41:32 UTC 2021
Tom Parent <tomparent at gmail.com> writes:
> I discovered you can connect the MapWithAI
> <https://gitlab.com/gokaart/JOSM_MapWithAI/-/wikis/home> JOSM plugin to a
> "feature service" layer hosted on the same MassGIS ArcGIS
> <https://massgis.maps.arcgis.com/home/gallery.html?view=grid&sortOrder=desc&sortField=modified&focus=layers-weblayers-features>
> online server or any other similar ArcGIS online server (was able to
> connect to Vermont's GIS this way too). Most compelling are OpenSpace and
> Parcels. This allows one to view and merge polygons directly all within
> JOSM...forget over-tracing raster images! It's eliminated a lot of tedium
> of doing exports from OLIVER and then importing. It's slick. I can share
> more details if interested or update the wiki myself.
Perhaps add a Massachusetts/MapsWithAI page with the details and refer
to it on otther pages? Our MassGIS page is getting big and that feels
splittable.
I have started a MassGIS/Datum page to try to explain the complexity of
NAD83/WGS84 as it pertains to OSM workflow. Will send a link to review
when it's coherent.
> Seems OpenSpace parcels have been cleaned up quite a bit from the initial
> import a decade ago. In many areas, polygons line up perfectly with parcel
> map. Some towns, not so much (I won't name names...) A personal new
> workflow on particularly misaligned parcels:
> - see if a better polygon existing in MassGIS
> - use MapWIthAI plugin to import
> - merge polygon over to the working layer
> - use the "Replace Geometry" command from the utilsplugin2 JOSM plugin
> <https://wiki.openstreetmap.org/wiki/JOSM/Plugins/utilsplugin2>. This
> preserves way/nodes history and tagging.
Definitely great to preserve the history.
After I get the datum stuff written up it will be interesting to see if
this workflow handles that right, but for openspace not a super big deal
as the offset is only about 1 m.
> On another note, I've noticed OSM is no longer an option for basemap in
> OLIVER. This is unfortunate because it was nice to peruse OLIVER with OSM
> as a basemap and at-a-glace see any difference in, say OpenSpace or
> wetlands, between the two. Would like to know what drove that decision to
> drop. Greg, perhaps you could ask your contact?
While OSM data is free to use (with attribution), the OSM tile servers
have a usage policy. It's certainly ok to use them to help editing --
that's arguably the main point. And small-scale use is ok. But apps
with lots of users, large-traffic websites, etc. are asked to render
themselves or use some other tile service.
https://operations.osmfoundation.org/policies/tiles/
Interesting that they have Google; I'd expect they have to pay for that.
> Would also love it if more "feature layers" became available like
> wetlands.
I'm not following --- in OLIVER you can search for and add layers on the
right. As far as I can tell all MassGIS data is available this way,
making this a slightly clunky view-only web GIS -- but one that's
already set up. It's under Physical Resources // Hydrography Water
Features // USGS Water Bodies 25K. Clicking it adds the layer and
shows a legend.
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