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, EP