A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
HELIOS, a nadir-looking sea ice monitoring camera
Abstract We present the prototype of a simplified photogrammetric system (HELicopter-borne Ice Observation System, HELIOS) and demonstrate how it can be used to document ground-based and airborne sea ice surveys. The aerial unit consists of a nadir-looking digital camera mounted on a gimbal, a GPS receiver and a computer. It is of low-cost and weight and is designed such that it withstands low temperatures, operates autonomously and fits to any standard helicopter skid. The accuracy of the georeferenced photographs is about ±15m for a flight height of 85m, flight speed of 130km/h and a GPS sampling rate of 4Hz. Systematic errors arise from the GPS-based determination of the camera position, the pointing accuracy of the gimbal, and the camera alignment in flight direction. Because most sea ice mapping projects require lesser accuracies than conventional mapping standards (e.g. ≤0.5m for a map scale of 1:600, ASPRS (1994)), HELIOS offers a broad range of applications. This includes the photogrammetric documentation of experimental sites as well as the verification of satellite-, and model-based estimates of sea ice and snow cover properties. Images taken simultaneously with other airborne observations provide a valuable tool to assess the accuracy of those measurements.
HELIOS, a nadir-looking sea ice monitoring camera
Abstract We present the prototype of a simplified photogrammetric system (HELicopter-borne Ice Observation System, HELIOS) and demonstrate how it can be used to document ground-based and airborne sea ice surveys. The aerial unit consists of a nadir-looking digital camera mounted on a gimbal, a GPS receiver and a computer. It is of low-cost and weight and is designed such that it withstands low temperatures, operates autonomously and fits to any standard helicopter skid. The accuracy of the georeferenced photographs is about ±15m for a flight height of 85m, flight speed of 130km/h and a GPS sampling rate of 4Hz. Systematic errors arise from the GPS-based determination of the camera position, the pointing accuracy of the gimbal, and the camera alignment in flight direction. Because most sea ice mapping projects require lesser accuracies than conventional mapping standards (e.g. ≤0.5m for a map scale of 1:600, ASPRS (1994)), HELIOS offers a broad range of applications. This includes the photogrammetric documentation of experimental sites as well as the verification of satellite-, and model-based estimates of sea ice and snow cover properties. Images taken simultaneously with other airborne observations provide a valuable tool to assess the accuracy of those measurements.
HELIOS, a nadir-looking sea ice monitoring camera
Krumpen, Thomas (author) / Haas, Christian (author) / Hendricks, Stefan (author) / Hölemann, Jens A. (author) / Kalmbach, Dirk (author) / Gerdes, Rüdiger (author)
Cold Regions, Science and Technology ; 65 ; 308-313
2010-11-17
6 pages
Article (Journal)
Electronic Resource
English
HELIOS, a nadir-looking sea ice monitoring camera
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