[Talk-ca] Seeking tips rev shoreline and terrain refinements

[Clifford Snow]

Dan,

On Sun, Apr 29, 2018 at 5:55 AM, Dan Doherty <d1doherty at gmail.com> wrote:

> Hello,
> I am fairly new to open street maps and am interested in a Skype/Zoom call
> to discuss the basics, and/or answers to some questions that will help me
> make some shoreline refinements and address some terrain description
> issues. I am working in Victoria BC, Canada but these questions are about
> general mapping principles.
>

There is a OSM meetup group in Vancouver, although I know it's not easy or
cheap, to go from Victoria to Vancouver. If you can make it over, there are
a number of people, myself included, that would be happy to help.
https://www.meetup.com/OpenStreetMap-Vancouver. Maybe Paul or Peter,
co-hosts of the meetup, would be interested in holding a mapping party in
Victoria. (I'm in Mount Vernon. Last time I took my car on the
Tsawwassen-Sidney ferry it cost more than the airfare!)

>
> 1. Several different feature and administrative borders converge on the
> shoreline, so it is difficult to see the reference aerial photography so I
> can make changes to the shore line. Is it possible to temporarily hide some
> features, or reduce the intrusion of the other borders while doing this
> work? I was thinking I could move the administrative boundaries off shore a
> short distance but not sure of the protocol around this. Is the some
> imported shoreline data set that defines the shore, or is this all done
> manually? I don’t want to be making changes then have it revert if someone
> else downloads Shoreline data set.
>

In iD you can use the Map Data icon on the left side to hide features. In
this case you can uncheck the feature to hide those. First make sure they
are not connected. If they are connected, even hidden, they will also be
moved. The only solution is to disconnect the two objects first. In JOSM
there is a filter dialog which does the same thing as the Map Data
checklist. The same rules apply to objected connected.

Let me make a pitch "Please don't connect unrelated features. It makes it a
pain to change just one of the features."


>
> 2. Just south of Shawnigan Lake there is a long arbitrary east west
> feature border that delineates forest to the north, but does not align with
> actual features or administrative boundaries. I’m wanting to modify that
> forest area to indicate an area recently cleared for residential
> development and a forest block within that, and to map general forested
> areas south of that  Not sure of the best strategy.
>

I think what you are referring to is the Canvec import of wooded areas.
This was a massive import covering most of the country. Feel free to
correct the boundary. If the development is in the middle of the wooded
area the only way I know how to add an inner polygon to the canvec import
is in JOSM. The problem is the canvec boundary is made of lines. iD wants
both to be polygon (area) features to join. JOSM doesn't have an issue. in
JOSM you would create your new residential development, then select both
the new development and the canvec area then go to Tools->Update
Multipolygon.

>
> 3. There are some common terrain features, some of which are in the
> international library but not on the library accessible to me...or at
> least, I can’t find them. How do I import or activate these features so I
> can apply them to local terrain. E.g storm water outfall, lake, pond,
> creek, beach access, undeveloped road right of way...
>

Yes there is a way to import features. There is a wiki page,
https://wiki.openstreetmap.org/wiki/Import/Guidelines which covers the
process. Basically the data must be in a license compatible with OSM's ODbL
license. A import page must be created to describe the import, and the
proposal should be discussed with the local community (talk-ca) Usually
it's much easier and more accurate to just add the data manually.

Best,
Clifford

-- 
@osm_seattle
osm_seattle.snowandsnow.us
OpenStreetMap: Maps with a human touch
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