The GPS Waypoints is a multi sector surveying tool that can applied for both professional and personal purposes. The application configuration and its three main functionalities that are described hereafter:
- Location and satellites status
- Waypoints surveying
- Paths and Areas surveying
The application takes advantages of the new smartphone’s receivers, with improved accuracies from 1.5 to 5 meters, using GPS and GLONASS satellite constellations. It allows users to perform simple surveying activities using the location service from Android devices. The configuration requirements when using the smartphone’s builtin GPS receiver is presented in the figure.
The application also allows professional users attaining better accuracies with Bluetooth external GNSS receivers (e.g. <1m). The external receiver is configured in the GPS Waypoints Settings where is selected a bluetooth paired device.
Location and satellites status
Current location and satellites available: the application identifies the location provider network (cell tower and Wi-Fi) or gps (satellite), the satellites acquisition status and the information of the current position.The dashboard shows the information of the current position in wgs84 format. The information is calculated from the visible satellites and includes the coordinates, bearing, speed, accuracy and time of acquisition. The altitude presented is relative to the Mean Sea Level (MSL) and thus represents the height in meters above mean sea level.
Waypoints Surveying: collects Points of Interest on the field to build a personal/business mapping database . The points acquired can be exported and shared to other applications (e.g. Dropbox/Google Drive) and may be viewed and processed in general consumer geospatial tool such as Google Earth (Personal Survey).
Waypoints thematic surveying: allows to collect thematic points for cartographic, environmental or urban planning purposes. The thematic surveying uses the tagging functionality that can be customized with the specific thematic data model. The waypoints can be classified according to the data model and can be exported with all metadata to a KML file. In some surveying activities the mobile precision may be enough but in others, requiring better precision, the application can be connected with an external bluetooth receiver (Professional Survey).
In-situ validation of thematic maps: collects field points (including both location and classification tags) that are used to validate maps derived from airborne or satellite imagery (Professional validation).
Share a waypoint: share waypoints location with another person via messaging application. It could be useful in situations such as visit my office on this location, meet me at this coffee shop, check out the issue I found, etc…
Paths and Areas surveying
Paths surveying: allows building an order sequence of points (path) and measuring distances of this path (Personal/Professional Surveying).Areas surveying: allows building polygons of the land properties on the field and measures their perimeters and areas.
An external receiver could be used in case better accuracies (with less than 1 meters) are needed, such as in cadastral surveying.