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Forest modelling and topographic mapping with airborne digital cameras

Douglas King
DK

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Douglas King

Résumé du colloque

A research program for development of airborne multispectral digital camera imaging methods in environmental analysis and digital elevation modelling/ortho-imaging is presented. Two sensors, a custom-designed multispectral digital camera sensor and the Kodak DCS CIR digital camera have been evaluated in these applications. The custom-designed sensor uses low cost components such as a rotating filter wheel, a PC platform, and a Kodak Megaplus 1.4 1320 x 1035, 8-bit camera. It acquires up to 8, 10nm bandwidth spectral bands in less than 1.2s. Four research projects that have used these two sensors and aerial photography will be described. 1. Relations of forest structure and health with spectral, spatial, and radiometric components have been established through sampling within individual tree crowns as well as over the canopy in 0.25 - 1m pixel imagery from an acid mine site. 2. Temporal study of individual tree crowns in archival photography of the site spanning 40 years found that ecosystem change adjacent to the mine tailings is much more dynamic than further away, tending towards greater openness and growth of pioneer deciduous species. 3. In forest regeneration assessment, the Kodak DCS CIR camera was used to acquire imagery with 2.5cm ground pixel size. Individual seedlings that were not overtopped by competing vegetation were classified and counted automatically with accuracy greater than 90%. Models of spectral and textural image information with LAI and % cover were statistically significant but need improvement. 4. In elevation modelling, accuracy on the order of the ground pixel size (0.7m) in an urban area and 4 times the pixel size (1.5m) in a rugged forest area was achieved. Current research in ortho-imaging using the Kodak DCS cameras will be described.

Contexte

Section :
La télédétection optique et radar et la géomatique pour la gestion des problèmes environnementaux
news icon Thème du colloque :
La télédétection optique et radar et la géomatique pour la gestion des problèmes environnementaux
manager icon Responsables :
Abdou Bannari
host icon Hôte : Université d’Ottawa

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Thème du colloque :

La télédétection optique et radar et la géomatique pour la gestion des problèmes environnementaux
Forest modelling and topographic mapping with airborne digital cameras
Douglas King