TopoTool: Topographic Mapper

This application allows you to survey land-surfaces with your android device. This data will be converted into a digital raster model which is useful for land analysis/simulation/design. Those raster models can be exported and for example, used in QGIS

supported inputs:
- internal GPS
- Bluetooth GNSS (RTK) receiver (NMEA)
- USB-Serial GNSS (RTK) receiver (NMEA)
- CSV files (EPSG:4326) with latitude, longitude, and elevation
- GPX file

supported outputs:
- GPX file
- Ascii Grid (EPSG:3857, EPSG:4326, UTM)
- Image (.png) and world file (.pgw)