USA - Detroit - Signposts

hoream-telenav commented 6 years ago

From @mvexel on April 5, 2017 4:49

Description

In this project we will map signposts in the Detroit, Michigan area. We will focus on adding new signposts as well as improving consistency in the existing data.

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How to map

We will follow the destination:* mapping scheme that is already in wide use in North America:

The exit number goes on the junction node as ref on the motorway_junction node.
The destination details go on the first _link way after the motorway_junction node.

We will use OpenStreetCam and Mapillary as sources. CheckAutopista will be useful to detect incomplete or incorrect exit tagging.

Who will be involved?

Telenav mapping team with the following users: alinan_telenav, biancah_telenav, simonap_telenav

I would recommend that if there is an existing exit_to tag that it be retained while the destination:* information is added. Also, in past experience adding this information, there are many instances where the highway=motorway_junction tag is missing or is incorrectly added (i.e. node ending motorway entrance ramp). Recommend that this task also include the addition of missing motorway_junction tags and the removal of incorrectly placed motorway_junction tags.

hoream-telenav commented 6 years ago

From @alinan-telenav on April 20, 2017 12:38

Thank you for the details. We will take in consideration what you suggested.

hoream-telenav commented 6 years ago

From @manuelab-telenav on April 21, 2017 12:45

While editing signposts in Detroit, we've found some inconsistencies in the OSM data, and we were wondering how to manage them.

Case 1

The tags in OSM look like this:

We also checked with Wikipedia and information doesn't match:

Case 2

It seems that the destination:street tag was taken from the first street: Is it correct to add information that is not on the signpost?

Case 3

Any suggestions on how to approach these cases? Our suggestion is to keep in OSM only the information that is on the sign. What are your thoughts on this?

hoream-telenav commented 6 years ago

From @markscalf on April 21, 2017 17:6

I would recommend having the destination tags represent the actual sign information.

hoream-telenav commented 6 years ago

From @vgXhc on April 27, 2017 12:57

RE Case 1: If you go back to 2007 in Google Street View, you can see that then the sign matched the information in Wikipedia.

hoream-telenav commented 6 years ago

From @techlady on April 27, 2017 20:37

Case 1: M14 basically ends at Plymouth at the junction with I-96, right on the border with Livonia (both are separate cities). It does not go to Detroit (though its continuation as I-96 does). So Plymouth is right. It gets close enough to Livonia that one could add Livonia as a destination.

hoream-telenav commented 6 years ago

From @techlady on April 27, 2017 20:48

Case 2: The sign at the junction of US 23 and Washtenaw Boulevard says only Ann Arbor in that direction, which is correct. Washtenaw basically takes you only into the heart of Ann Arbor, no further.

hoream-telenav commented 6 years ago

From @alinan-telenav on May 8, 2017 13:55

Thank you very much everybody for your support. Looking forward to receive more advises from you.

hoream-telenav commented 6 years ago

From @manuelab-telenav on July 19, 2017 11:16

We worked on this issue for 8 days and succeeded to review all motorway exits in Detroit area for adding new signposts or editing existing ones.

Breakdown stats for adding signposts in Detroit area:

git1

The following chart shows how the numbers increased during our work to improve the map:

The areas where we edited are highlighted in the heatmap below:

hoream-telenav commented 6 years ago

From @markscalf on July 19, 2017 16:0

Great progress Manuela. Would you happen to know which ones still need an image? I noticed, node 61858496 includes a motorway_junction but is missing destination information. A list would be helpful to local community so that we know where we can help collect imagery and add missing information. Thanks

hoream-telenav commented 6 years ago

From @techlady on July 19, 2017 16:2

     Great work, folks!
     By the way, how do you get the data?

From the State of Michigan or do you have to go out and take photos of each sign?

Charlotte

At 04:16 AM 7/19/2017, you wrote:

We worked on this issue for 8 days and succeeded to review all motorway exits in Detroit area for adding new signposts or editing existing ones.

Breakdown stats for adding signposts in Detroit area:

https://user-images.githubusercontent.com/24428741/28364218-2a341186-6c8c-11e7-9f6b-3a3c5431bc47.JPG git1

The following chart shows how the numbers increased during our work to improve the map: https://user-images.githubusercontent.com/24428741/28364270-66b181fc-6c8c-11e7-83c0-6d050ee2ece3.png image

The areas where we edited are highlighted in the heatmap below: https://user-images.githubusercontent.com/24428741/28364286-72f2c44e-6c8c-11e7-84d8-842b7797f67b.png image

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Charlotte Wolter 927 18th Street Suite A Santa Monica, California 90403 +1-310-597-4040 techlady@techlady.com Skype: thetechlady

hoream-telenav commented 6 years ago

From @alinan-telenav on July 20, 2017 11:26

@markscalf Thank you very much for your support. The remaining motorway junctions without image have the following node ids: 62475953, 61528723, 61524982, 61527941. Any help is very useful.

hoream-telenav commented 6 years ago

From @alinan-telenav on July 20, 2017 11:28

@techlady Thank you for your comment. We added the signpost information only from OpenStreetCam and Mapillary pictures.

TelenavMapping / US_mapping_projects