[Talk-us] finding city boundary info?

Ray Kiddy ray at ganymede.org
Sun Nov 8 23:44:05 UTC 2020


Hello -

Can anyone explain the best way for me to do something here? I am trying 
to identify the city boundaries of a city in California. Right now, 
there is a relation for the city of Blythe which covers a very small 
area to the west of the city. And then there is a node in the center of 
the city. I how (mostly) how to use both JOSM (not as an expert) and iD. 
But there is obviously something here that I do not understand.

Blythe is on the border of California and Arizona on the interstate 
between LA and Phoenix.

I have downloaded the 2019 TIGER data for California 
(https://www2.census.gov/geo/tiger/TGRGDB19/tlgdb_2019_a_06_ca.gdb.zip).

I can load the data in QGIS, select "Incorporated Places" and I see this:

If not in email, see: 
https://opencalaccess.org/misc/Screen%20Shot%202020-11-08%20at%203.26.32%20PM.png

There it is. Blythe, CA.

Then I can zoom in and see a little bit of the edge on the southern city 
of the city.


If not in email, 
see:https://opencalaccess.org/misc/Screen%20Shot%202020-11-08%20at%203.30.13%20PM.png

So, we are looking at object # 383948. The north and east edges of this 
block makes up part of the city boundary.

Now, how do I find out what the features on the north and east side of 
the block are called? How do I find this in the map using either JOSM or 
iD? I was hoping that I could search for the tiger object with this id 
but I cannot seem to. Is there are way to find it that I do not see?

When the TIGER data was in the form of text files (about 10 years ago), 
a line in the TIGER data set would show its name. But it does not 
contain this information in the GDB files? Is there somewhere else one 
can get this?

What am I missing here?

If I can find the feature in JOSM, then I can add it to the relation. 
Shouldn't TIGER lines be somewhere in the map here, findable in JOSM? 
How can I search for them?

Any suggestions would be appreciated.

thanx - ray


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