awisemanapple
commented
6 years ago The related HOT task is almost done (http://tasks.hotosm.org/project/3258) and we received positive feedback from Enock Seth Nyamador, a member of the community. As such we are going to mark the project as complete on Apple's Github and validate the last few squares. Thank you to all who participated!
While working on the project, we found some road names that may be incorrect. We put them on MapRoulette if anyone in the country or with knowledge of local road names would like to take a look: http://maproulette.org/map/2801 — in short, if a road name is correct, mark it as a false positive, otherwise please fix the name in OSM. To use MapRoulette, just log in with your OpenStreetMap account and click through each issue. We also emailed the talk-gh list about this.
Firefishy
enockseth
Task Description
This task outlines work to improve map data in Ghana. We plan to work on improving the road network, such as adding missing roads, fixing network issues such as missing connections or crossing roads, and other related issues. We also plan to update and correct coastline and water features as we find them, and correct and improve land use and land cover polygons where needed, such as airports, national parks, forests, colleges and universities, and so on -- remove duplicates, correct the boundaries, fix incorrect tags and other similar things.
Improvements that are intended to be addressed include the following:
Examples of these are provided below.
Mapping Guidelines
The team will follow OSM, regional, and local policy, along with any other guidelines as appropriate.
For water and coastlines, the team will follow OSM coastline guidelines, waterways policy such as water and natural=water and local policy along with any other policy as appropriate. Some coastlines are connected to administrative boundaries, in which case we will adjust both if appropriate Where we see them, we will remove the
source=PGStag, which was from an earlier coastline import that needs to be cleaned up. We received a message on the India coastlines project requesting this, and it is commonly done in other coastline improvement edits.The team will use the imagery and data sources specified below for mapping in Ghana.
When in doubt, the team will use the existing tags and data which are used locally. The history in JOSM (ctrl-H) identifies what previous mappers added and their notes and/or explanations regarding changes made. This history can also show if a previous mapper has visited that area or has expert knowledge or sources.
We have also messaged talk-gh to get feedback and suggestions about the project.
Our team uses the hashtag #adt (for Apple Data Team) for our edits.
Area of Focus
Throughout Ghana.
Tools
The team will use JOSM for completing the task. JOSM has validation warnings for road networks and other possible issues that are important to prevent improper changes.
Sources
The team will apply image offsets as needed.
Task Examples
Here are some examples of the issues the team plans on resolving:
Fixing connectivity
Examples of Missing connections:
Before
After
Examples of Overlapping Ways:
Before
After
Finding incorrectly classified roads & inconsistent classifications
Before
After
Alignment
Before
After
Changeset Comments
The team will provide changeset comments that are in compliance with OSM changeset guidelines.
Error Detection
The team will check for errors visually and using JOSM validation warnings prior to committing the changeset.
In addition, the team will review its work in accordance with the task guidelines including the OSM Wiki and LearnOSM validation guidelines
Contributors
MapRoulette
We have also posted MapRoulette challenges related to the road network: https://maproulette.org/browse/projects/40669
For more information
Our community lead is Teddy Ahlvin and our editing leads are Jon Westlake and Erica Olson. To get in touch with Teddy, you can email or contact him via OSM. (https://www.openstreetmap.org/user/LessThan3Nodes) All of our leads can be reached via email.
OSM Wiki