Title HELIOS, a nadir-looking sea ice monitoring camera
Author Krumpen, T.; Haas, C.; Hendricks, S.; Holemann, J.A.; Kalmbach, D.; Gerdes, R.
Author Affil Krumpen, T., Alfred Wegener Institute, Department of Sea Ice Physics, Bremerhaven, Germany. Other: University of Alberta, Canada
Source Cold Regions Science and Technology, 65(3), p.308-313, . Publisher: Elsevier, Amsterdam, Netherlands. ISSN: 0165- 232X
Publication Date Mar. 2011
Notes In English. Based on Publisher- supplied data GeoRef Acc. No: 309967
Index Terms accuracy; aerial surveys; computer applications; helicopters; ice; mapping; photogrammetry; photogrammetric surveys; photography; remote sensing; snow cover; surveys; aerial photography; airborne methods; cameras; data processing; digital cameras; Global Positioning System; helicopter methods; HELicopter-borne Ice Observation System; HELIOS; imagery; monitoring; nadir-looking; sea ice
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 15 m for a flight height of 85 m, flight speed of 130 km/h and a GPS sampling rate of 4 Hz. 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. <=0.5 m 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.
URL http://hdl.handle.net/10.1016/j.coldregions.2010.11.007
Publication Type journal article
Record ID 65006885