4.3.1. High Geometric Accuracy

More specifically, the expressed need by government stakeholders for highly accurate spatial data can entirely be met by UAS imagery as shown by the low RMSE of checkpoint residuals in this study. Even though the national CORS in Rwanda cannot be considered as a source of GNSS corrections for PPK workflows, different means of georeferencing have proven to hit similar accuracies. This data characteristic facilitates the manual or digital delineation of parcel boundaries and support valuation and taxation processes–two needs which were prioritised by non-government stakeholders. The current cadastral map is based on the LTR programme which followed a general boundary approach which sometimes shows several meters offset to the correct location of the boundary. Most disputes arose during land transactions in densely populated areas, where plot sizes are small, and people depend on their land for subsistence farming. In those cases, UAS data ultimately facilitates a reliable and geometrically correct database to correct existing cadastral data.
