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OpenStreetMap Toolbox

3.3 Data quality control

Data validation, an essential step to come out with good quality data!

This part of the tutorial discusses methods and tools used to check the quality of data in OpenStreetMap, and more particularly in humanitarian and development contexts, although the methods suggested can certainly be used in other contexts.

Validating data is an important part of the project Missing Maps process, allowing to make sure that the data is complete and correct, in such a way that it can be used by the organization initiating the request of the maps, but also by all the other users, since the data will sustainably remain in the OSM database and will remain visible and usable by everyone.

Resources at your disposal

  • Previous sections of this toolbox:

In the previous sub-section 3.2 Starting to map with OSM, we presented in detail how to map buildings, roads, residential areas, and rivers. We gave out advice for mapping efficiently and checkpoints to watch out for.

Before starting to read this new section on validation, we invite you, if that has not been already done, to read the previous one. Even if you are already experts in the subject, you will perhaps find some interesting tips and will maybe be able to change some bad mapping habits.

  • NGOs that are publishing mapping projects on the Tasking Manager:

In general, before you start the data validation of a project, we recommend that you contact the NGO that have created the mapping project, their team will be able to provide you with more information on the validation mission of the project that interests you.

This subsection is divided into 4 parts: