[](https://heicast.uni-heidelberg.de/paella/ui/watch.html?id=9e838e36-8acc-4ce8-b354-afec301ca48f)
## Motivation/Goal
healthsites.io:
* "When a natural disaster or disease outbreak occurs there is a rush to establish accurate health care location data that can be used to support people on the ground. This has been demonstrated by events such as the Haiti earthquake and the Ebola epidemic in West Africa. As a result valuable time is wasted establishing accurate and accessible baseline data."
@@ -43,6 +43,9 @@ The [Wiki](https://wiki.openstreetmap.org/wiki/Main_Page) is one of the most imp
The term "snapshot" usually refers to the OSM data at a specific point in time. When downloading OSM data from almost any website, you will download a specific snapshot. A snapshot usually contains only information on the latest version of each object in OSM. E.g. if a building has been created and then someone else will change the outline of this building, only the uid of the second contributor will be visible in the snapshot.
## Contributions
[](https://heicast.uni-heidelberg.de/paella/ui/watch.html?id=9005848d-c193-4aad-8e54-b704670dc0b9)
In contrast to snapshots, contributions put an emphasis more on the history of the OSM data. A contribution often refers to an edit performed by an OSM contributor for a specific OSM object. For instance, creating a new building can be seen as a `contribution`. There are different types of contributions. In general one of the following:
