Closed pratikyadav closed 8 years ago
There is a more updated version of mapillary coverage in our vectortiles. You can find more information here http://blog.mapillary.com/update/2015/05/27/vectortiles.html
The endpoint is https://d2munx5tg0hw47.cloudfront.net/tiles/{z}/{x}/{y}.mapbox
@pratikyadav exciting workflow here! It looks like your link above for State DOT exit numbers is only for California. For Maryland, there isn't a public point based feature representing exit points that I know of. However, you can query on the state's open data portal to look for route segments where the station_description
(segment description) include the word "Exit" to find any segments with their exit number in the attributes.
Following up from my comment above. Based on the data in the Gist, you can analyze the segments and determine the Exit Number for all Maryland State maintained roads.
One other useful thing, you can check your work with the CheckAutopista2 tool. Here's an example with Interstate 83. Red dots indicate no exit numbers are present.
@gyllen This is great!! Mapillary coverage is going to be an important source in this mapping project. 🚀
@talllguy The gist for Marryland looks great. Nice work 👏 🚀
We took CheckAutopista2 for a small trial before coming to this final workflow. Indeed, the tool is great, easy to use and can speed up the productivity. The only issue is its dependency on overpass-turbo api. We faced some problem when multiple people were sending request from the same IP address. We are looking for ways to overcome this issue and include CheckAutopista2 asap in our workflow.
Observations
While working on California highway CA 24
, came across this ref tag. As per the tag information there should be two exits, one to the left and the other to the right. But I see only one road branching out from this point.
Could someone please help understand how this works?
https://www.openstreetmap.org/node/1215636490/history
cc @planemad @pratikyadav
@ramyaragupathy just checked it out. This is basically the end of CA-24 and both the roads at the fork are each considered an exit, one heading southbound on I-680 and one northbound on I-680.
This is exactly what is mentioned in the caltrans list.
cc @1ec5
What would be the best way to add multiple refs to an exit?
Example: Exit 434A, 434B in SF on US-101
Various options ares:
ref=434A;434B
ref=434B|434A
ref=434
cc @1ec5 @ajashton
Is it common to have multiple physical exits with the same ref
? Should the missing ones for the weigh station exit be added?
http://k1wiosm.github.io/checkautopista2/?id=69364&lat=38.7015&lon=-121.3173&z=15
I have posted the diary with the above contents.
/cc @planemad @pratikyadav
What would be the best way to add multiple refs to an exit?
ref:left
and ref:right
would be reasonable, I think. The wiki recommends a different approach using a semicolon, but both schemes could be used concurrently.
Is it common to have multiple physical exits with the same
ref
?
It’s common for opposing directions of a divided highway to have separate physical exits with the same ref
. So both northbound and southbound I-75 might each have an exit 28A and 28B at the same interchange; exit 28A might go eastbound from northbound I-75 but westbound from southbound I-75.
Regarding missing exits in California, be sure to verify the presence of number signage on Mapillary. I just spot-checked U.S. 101 in the San José area, and some exits have ref
s on OSM despite being unnumbered on signage.
For example, this northbound exit node has a ref
. As I discovered driving down this stretch yesterday, this particular exit is numbered going southbound, but not going northbound. I think cases like these, where there’s an official exit number but no signage, should be tagged with unsigned_ref
to avoid causing navigation software to use a number that the user can’t find.
I believe the ref:left
and ref:right
are the old way, where junction nodes were solely used for routing directions. From what I've seen with the Mapzen routing engine, the router can infer right or left at the fork, based on the tags on the downstream highway link, if they exist. Conversely, if there aren't downstream destination:*
tags, I suppose it'd be best to leave the ref:left
and ref:right
.
For the sign in the wiki:
We added tags on 202 motorway junctions that included: 1. exit numbers i.e ref=*
, 2. missing exit numbers noref=yes
at the rate of ~16 tags per hour while checking for references on Mapillary Imagery, official DOT documentation, and Wikipedia. Based on this run, and progress, our estimate is to be able to complete adding exit tags in all 9 states in one week. Here is a full breakdown of what we did:
Created an Overpass query to get a better sense of the stats:
motorway_junction
edited by team in last two weeks: 179ref
: 49 (green)noref
: 135 (red)ref
and noref
(invalid?): 5
@pratikyadav mismatch with the stats from osm-query is probably because it used a bbox rather than the USA polygon with the above overpass query. The 5 exits with both ref
and noref
needs a recheck.
You guys might want to fix your 'changeset' comment for this project. You're linking people to Issue #164, instead of here to #165. Had to look around here to get to the correct place after seeing several changesets with the incorrect issue link in them.
@rickmastfan67 Thanks for flagging this. I have changed the comment and notified the team to use 165
instead of 164
.
We finished the mapping of exit numbers for these 9 states using Checkautopist2 and here are some observations-
220+
motorways in these 9 states and added 63 missing exit numbers using mapillary images.motorway_junction
with no relevant exit number, and thus assigned noref=yes
to them.Break-down-
ref=*
+ 219 noref=yes
)OSM Diary -> https://www.openstreetmap.org/user/jinalfoflia/diary/38501
@mapbox/team-data great work 🚀
Shout-out for @k1wiosm for checkautopista2 and @talllguy for flagging the tool here. 👏 🚀
Task objective
Mapping missing exit numbers on motorways in USA by adding
ref
tags on motorway_junctionsImagery source- crosscountryroads.com
Background
There are over 52,000
highway=motorway_junction
in USA with almost 9000 of them missingref
tag representing the corresponding exit number.Map of
highway=motorway_junction
withoutref
tag [as on 30 march 2016]Focus area
For now following 9 states based on mapillary coverage have been selected as priority areas.
Mapping Workflow
Locate
highway=motorway_junction
nodes missing exit numbers (represented by blue dots in TMS layer) and addref=*
for corresponding exit number using combination of Department of Transportation(DoT) exit number documents, mapillary images and other sources.Gist for detailed workflow with examples Last updated 6th April
Changeset comment and source
Comment->
Adding missing exit numbers https://github.com/mapbox/mapping/issues/165
Source->Bing;Mapillary;Wikipedia
Team
@mapbox/team-data
Duration
Current estimate is 2 weeks
Resources
tms[22]:https://api.mapbox.com/v4/pratikyadav.3b94b1a9/{zoom}/{x}/{y}.png?access_token=pk.eyJ1IjoicHJhdGlreWFkYXYiLCJhIjoiMTA2YWUxNjRkNmFmZGQ4YzAxZWFiNDk0NDM1YjE1YjAifQ.4P6N5dNmA_WQXd3BsJvu5w
ref
tagstms:http://d2munx5tg0hw47.cloudfront.net/tiles/{zoom}/{x}/{y}.png