As I mentioned in the diary post, it doesn't handle any of those cases. To be sure, there is a regular expression behind the scenes to ensure that Texas Loop highways for instance aren't given the us-state shield value. On the other hand, there isn't any logic to sort out true edge cases like Arkansas Highway 43.
I still believe combining that regular expression with the spatial query is a step up from the common practice of using only a regular expression, and in optimistic that, if nothing else, this demonstration will spur others to keep working toward true route relation support. Minh Nguyễn Sent from my autocorrect-ennobled device > On Jul 27, 2016, at 11:43, Paul Johnson <ba...@ursamundi.org> wrote: > > OK, but how does it handle literal edge cases? Such as WA 433 in Oregon, OK > 20 in Arkansas, or AR 43 in Oklahoma? Or not-so-edge cases such as Texas' > infamous multitude of state highway networks, or the two state highway > systems in Oklahoma, Kansas and Missouri? > >> On Wed, Jul 27, 2016 at 2:12 AM, Minh Nguyen <m...@nguyen.cincinnati.oh.us> >> wrote: >> A couple days ago, I posted a diary entry about rendering state-specific >> highway shields using Mapbox tools. It's a topic of special interest to the >> U.S. community, so I figured I'd give the talk-us list a heads-up since not >> everyone reads the diaries regularly: >> >> <http://www.openstreetmap.org/user/Minh%20Nguyen/diary/39123> >> >> The diary entry begins with a summary of the arguments for pictographic >> shield rendering and the challenges facing renderers that attempt to >> differentiate between each state's design. I also argued against using >> regular expressions to select state route shields. >> >> I developed a demonstration vector renderer, called Interstate, that >> differentiates between the Ohio, Kentucky, and Indiana state route shields, >> despite ambiguous `ref=SR 123` tagging in both Ohio and Indiana: >> >> <http://nguyen.cincinnati.oh.us/minh/osm/interstate/> >> >> Though Interstate is only a proof of concept design-wise, it runs on >> production servers and mainstream software. The second half of the diary >> entry walks you through the steps to create your own, prettier version of >> Interstate using free Mapbox tools. >> >> (Full disclosure: I work at Mapbox. But my motivation for posting the >> tutorial is to nudge the community away from relying on regular expressions >> to select shields and towards eventually using route relations for that >> purpose.) >> >> For now, I continue to point people to >> <http://elrond.aperiodic.net/shields/> when I want to show them what route >> relations are good for, but Interstate is another option when the issue of >> way `ref` formats comes up. >> >> -- >> m...@nguyen.cincinnati.oh.us >> >> >> _______________________________________________ >> Talk-us mailing list >> Talk-us@openstreetmap.org >> https://lists.openstreetmap.org/listinfo/talk-us >
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