[Talk-us] Newly tweaked TIGER road names tiles

[Paul Johnson]

Oh, and they're flat out hosed in the Tulsa County area, particularly at
the same latitude as Broken Arrow (TIGER carries Broken Arrow-specific
street names into Tulsa City improperly).


On Mon, Nov 19, 2012 at 9:23 AM, Charlotte Wolter <techlady at techlady.com>wrote:

>  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
> 927 18th Street Suite A
> Santa Monica, California
> 90403
> +1-310-597-4040
> techlady at techlady.com
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>
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