[Talk-us] interesting crossing of borders between CA and AZ

[Ray Kiddy]

Hello -

I am seeing an interesting editing task at the eastern edge of Riverside 
County in California. As of now, I am not expert enough in JOSM to do 
it, but I will, at some point, be able to do it and I will do it then. 
Unless someone else wants it.

I am starting to add lines to define the city boundaries of Blythe, CA. 
Almost nothing is there in OSM.

But the interesting bit is at the nothern part of the eastern edge of 
the city boundary. This line in the Colorado River actually separates 
the states of California and Arizona and is the eastern boarder of 
Blythe but it is also the western border of the Colorado River Indian 
Tribes Reservation (https://www.openstreetmap.org/way/702934460).

The issue is that the southern border of the reservation actually 
crosses the CA-AZ state line and this is not seen in OSM. It has a "toe" 
sort of shape, facing west. See the eastern edge of the map below.

https://gis.countyofriverside.us/Html5Viewer/?viewer=MMC_Public

So, what I think I need to do is:

1) Change the reservation from a way into a relation with the proper 
admin level. (Done)

1a) Fix the southern border of the reservation, which should cover the 
road there. The reservation does not include the road in OSM.

2) Split the way that currently cuts off the toe, but I need to not muck 
up the CA-AZ border.

3) Add the lines for the toe. This also involves moving the northern 
edge of the Palo Verde Ecological Reserve, whose northern edge is too 
far north in OSM.

4) Actually the nothern edge of the eco reserve needs to be split off 
because it is now also the border of the reservation.

5) Add the ways created for the norther edge of the toe into the 
reservation's relation.

And that is it. And I need to not break all of the other things around. 
Easy peasy! :--)

I am open to any suggestions. On the other hand, I am willing to do 
these things when I figure out some of the advanced stuff in JOSM. Fun 
stuff.

cheers - ray