In order to coordinate the various mappers collaboratting on this task the OpenStreetMap Tasking Manager (OSMTM) is going to need to access your OSM account. If you havent logged in when you select a grid square to edit it OSMTM will ask permision at that time. Once logged OSMTM will ask you which editor you prefer to use. For first time editors iD may be the easiest. If imagery has been provided for the grid square you have selected than you may be required to agree to the terms of a license to make use of the imagery. If a license agreement appears at this stage please review it before signing.
Make sure you’re using the right background imagery. For this task, you will have multiple types of imagery to choose from but you should use the default custom imagery whenever possible. If and only if the screen is black, try switching to Bing imagery. This option can be found on the navigation bar on the right of the screen.
Having selected your square and inspected it with the imagery in place, you may realise that there is far too much detail for one person to map. In this case you may want to split your square into smaller more reasonable tasks. As a general rule if you think that it will take longer than 2 hours to map all the tasks features in one square than you should probably split it up.
It is important to use caution when splitting squares because it comes at a cost - any usefull comments previously completed in the square will be lost.
To split your sqare simply click split the button in Tasking Manager
Many buildings in the Saraya District of Senegal are made with mud and have thatched roofs. Please label these as general buildings. Community-based team members will update the labels.
Thatched roof buildings are typically round in shape. Use the letter “o” button on your keyboard after tracing to make your polygon a perfect circle.
The majority of roads that you see in the imagery should be classified as “residential”. As the name implies, these roads connect houses and run through neighborhoods. These roads are easily seen but won’t look particularly wide - most of them are only about one lane wide. When in doubt, classify a road as residential.
OSM is constantly changing and no matter how filled out an area on the map is it is never done. The impression that validating a grid will mean that it will never be revisited leads many to feel intimidated by it. Anyone can validate! Just remember, do not validate your own work.
Validating a grid means that everything that needs to be done to meet the goals of the task you are working on. If the task is to map every type of feature possible and provide attributes this may be very complex and may require field verification but if the goal is to map basic features in a sparsly populated area this process is fairly straight forward.
Now check if buildings are missing. If there are a large number missing, the grid can be invalidated. If it's only a few then it's simpler to add them as you check around.
Are the buildings correctly traced? Sometimes mappers do not trace buildings accurately & if you spot significant inaccuracies this needs correcting. You may find that a group of buildings looks like they match the shape of roofs but are displaced from where the building is in the imagery, this often happens when OSM has been traced based on imagery that has been misaligned. For the purposes of this task - unless the alignment is aggregious - leave the buildings if you suspect displacement is due to an imagery issue.