Canadian Forest Service Publications

ITC Analyses of the Petawawa Research Forest from Satellite and Aerial Data. 2011. Gougeon, F.A.; Leckie, D.G. in the joint presentation of the 32nd Canadian Symposium on Remote Sensing and the 14th Congress of L’Association québécoise de télédétection, June 13-16, 2011, Sherbrooke, QC. [s.n], [s.1].

Year: 2011

Available from: Pacific Forestry Centre

Catalog ID: 32548

Language: English

CFS Availability: PDF (download)

Abstract

Software packages such as the ITC Suite permit the analysis of high resolution (≤ 1 m/pixel) images of forested areas and provide information close to the individual tree crown (ITC) level towards the semi-automated production of forest inventories. First developed with/for aerial images, these techniques are now applied to satellite images with good success. Here, we make a direct comparison of the results obtained from one media versus the other using the exact same geographical area.

In this paper, we report on the ITC analyses of an IKONOS image and of ADS-80 flight lines (at 40 cm/pixel) over the Petawawa Research Forest (PRF), Ontario. After pre-processing and crown delineation, ITC classifications were pursued and tested using exactly the same training/testing areas on both media. Results are reported for the following ten classes: hard and soft maples, red oak, white birch, poplar, white pine, jack pine, red pine, white and black spruce. We comment on how the much lower spatial resolution of the IKONOS multispectral data (at 4 m/pixel) affects species recognition and on how the lower panchromatic resolution (1 m/pixel) affects tree delineation and tree counts. Using forest stand polygons delineated by “conventional means” from the 2007 forest inventory, we also compare the results obtained from the IKONOS and ADS ITC analyses at the forest stand working group level (or 1st species) with that of the inventory and with each other. For the species that were well recognized by the ITC classification process the agreement averages 60% and 53% for the ADS and IKONOS, respectively, and 65% with each other.

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