**5. Assessment/data validation**

Generally, assessment and data validation is done after fieldwork. All the sampled points are extracted from the GPS via Basecamp software, and then they are transformed in gpx format. The gpx can be imported in ArcGIS software. The first assessment done is the visual checking whereby the supervising team observes all the points and ensures that the collected points match with the planned ones and all SOP are respected before they are validated. If one of the points taken does not match with the planned one, then a particular attention is given to them for rectification. Two situations can arise here with the visual checking after measuring the distance between the planned and sampled points:


After the visual assessment, the ACCESS database is also checked in order to verify that data entered here are in conformity to the information pertaining to the sampled point on ArcGIS. For example, no sample can be entered without their geologic characteristics.
