[Talk-us] Newly tweaked TIGER road names tiles

[Charlotte Wolter]

Toby,

         We do have to be careful with these. An earlier effort 
created some incorrect tagging in the Four Corners area, where I map,
         --W Road (a county road in SW Colorado) ended up as West 
Road and S Road as South Road.
         --And, N36 (for Navajo 36) ended up as North 36, as did a 
lot of Navajo roads. It took me a while to figure out what was 
happening. Luckily I have a contact at Navajo Division of 
Transportation, who assured me they have no roads named "North."
         I still find these from time to time, so a lot of incorrect 
tags were created.
         But, if you've got a good way to do it, great! It sure is 
tedious to do them manually.

Charlotte


At 01:40 PM 11/18/2012, you wrote:
>As we briefly discussed during the virtual mappy hour last week, I
>have managed to wrangle some TIGER data and do some automated
>expansion of abbreviated street names on the TIGER road name tiles.
>The results can be seen in a new tile layer. You can preview it here:
>http://tile.osm.osuosl.org/tiles/tiger2012_roads_expanded/preview.html#17/37.79816/-122.24627
>
>I just added the appropriate URLs for the new layer to the TIGER 2012
>page on the wiki so you can use them in JOSM and Potlatch as well:
>http://wiki.openstreetmap.org/wiki/TIGER_2012
>
>Since this is a brand new tile layer, nothing is cached in the CDN so
>requests might be a little slower than normal at first.
>
>I am fairly certain about the accuracy of the process and the checks I
>have performed all came back with good results. But of course TIGER
>being such a large and varied data set, there might be an odd edge
>case lurking somewhere so it would be great if some people could check
>their areas and make sure they don't see anything odd.
>
>The other tweak I made after a suggestion from Ian was to draw the
>tiles in two layers. One drawn first with only lines and then another
>layer with only names on top of it. This means that road names will
>always appear on top of road lines. This avoids roads obscuring names
>and improves readability.
>
>Technical details: This was *not* done by doing simple string
>matching. I downloaded all of the "Feature Names Relationship" files
>which contain separate fields with codes for directional, type and
>qualifier prefixes/suffixes. Then I composed the name one element at a
>time from these fields. This gave me a mapping from TLID to expanded
>street name which I then imported into a new column in the existing
>table that is used to render the tiles. Then it was just a simple
>matter of telling the mapnik style to look at the new expanded name
>column.
>
>Toby
>
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Charlotte Wolter
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