A platform for research: civil engineering, architecture and urbanism
A platform for research: civil engineering, architecture and urbanism
Balloon Photogrammetry along the Middle Fork John Day River, Oregon
Low altitude balloon photogrammetry has been used to obtain high-resolution photographs and detailed topographic information of large wood restoration projects on the Middle Fork John Day River in Oregon. These data can be used to monitor changes in channel morphology. Overlapping photographs and ground survey control points are input into a photogrammetry software program to produce orthophotographs and digital terrain model elevation points. To acquire the photos, a remote-controlled digital camera is attached to a 2.4 meter diameter helium balloon. The balloon is tethered to the ground and flown above the location of interest. Ground survey control is established by using global positioning system (GPS) equipment to survey ground targets placed within the photographed area. Photographs of the large wood structures were obtained in November 2008 and September 2009. The photographs were used quantitatively to determine the exact location of each log within the structure, log lengths, structure extent into the channel, and area of bars formed downstream of the structures. Qualitatively, the photographs were used to see how much hydraulic cover for aquatic species was being provided, find the formation of pools and bars that created a habitat, and planform locations. Elevation data were accurate on exposed land and but not in vegetated areas. Below water topography is not accurately captured in the processed elevations. There are limitations to a balloon-based data collection process. Data collection is very weather-dependent. Photo processing can be time intensive. Site conditions also determine the feasibility: power lines, trees, and steep embankments can cause difficulties maneuvering the equipment.
Balloon Photogrammetry along the Middle Fork John Day River, Oregon
Low altitude balloon photogrammetry has been used to obtain high-resolution photographs and detailed topographic information of large wood restoration projects on the Middle Fork John Day River in Oregon. These data can be used to monitor changes in channel morphology. Overlapping photographs and ground survey control points are input into a photogrammetry software program to produce orthophotographs and digital terrain model elevation points. To acquire the photos, a remote-controlled digital camera is attached to a 2.4 meter diameter helium balloon. The balloon is tethered to the ground and flown above the location of interest. Ground survey control is established by using global positioning system (GPS) equipment to survey ground targets placed within the photographed area. Photographs of the large wood structures were obtained in November 2008 and September 2009. The photographs were used quantitatively to determine the exact location of each log within the structure, log lengths, structure extent into the channel, and area of bars formed downstream of the structures. Qualitatively, the photographs were used to see how much hydraulic cover for aquatic species was being provided, find the formation of pools and bars that created a habitat, and planform locations. Elevation data were accurate on exposed land and but not in vegetated areas. Below water topography is not accurately captured in the processed elevations. There are limitations to a balloon-based data collection process. Data collection is very weather-dependent. Photo processing can be time intensive. Site conditions also determine the feasibility: power lines, trees, and steep embankments can cause difficulties maneuvering the equipment.
Balloon Photogrammetry along the Middle Fork John Day River, Oregon
Russell, Kendra (author)
Biennial Geotechical Seminar 2012 ; 2012 ; Denver, Colorado, United States
GeoChallenges ; 121-133
2012-11-09
Conference paper
Electronic Resource
English
Habitat Restoration on the Middle Fork John Day River
| British Library Conference Proceedings | 2009
Middle Fork and South Fork of the Upper Rogue River Watershed analysis ; Forks Watershed analysis
| BASE | 1998