Both the rover and the base station are connected to the GNSS satellites.
The rover (this can be any device that moves, drone included) connects to the base station. Units inside RTK devices operate in the same manner. Real Time Kinematic Operational Differences
#GROUND CONTROL POINTS SOFTWARE#
The photogrammetry software later uses this data to use precise camera center positions. In RTK-equipped drones, such data is embedded into every image that the drone takes when the RTK signal is available. However, when it comes to photogrammetry, to get a reasonable level of absolute accuracy, we need RTK data. These units are good enough to guide you through a city or mark an approximate location where the image was taken. Every smartphone and drone on the market has a simple GPS/GNSS unit. RTK is a level of GNSS data accuracy far superior to consumer-grade data available for those using non-RTK GPS/GNSS devices. You can read more about Ground Control Points here. The coordinates are saved, and the GCPs are ready to be used. A ground control point must have its precise coordinates measured with survey-grade equipment. A GCP can be anything, either the familiar black and white marker, a spray-painted dot, or any fixed spot. Ground control points are points on a scanned object or a surface. Which is the best for you, and are there differences in inaccuracy? Read further to find out. In this article, we will find out the fundamental difference between RTK level metadata and GCPs in photogrammetric project referencing. GPS metadata can come in the level of RTK precision, while ground control points (further GCPs) are always made with survey-grade equipment. With aerial photogrammetry, there are two most commonly used types of referencing – GPS metadata in the photos and ground control points in the scene.
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