PE&RS August 1999

Cover Image

Applanix’s integrated inertial/GPS Position and Orientation System for Airborne Vehicles (POS/AV) has found a wide range of applications with airborne sensors. One of the more interesting ones is airborne laser scanning. In order to remove the aircraft motion-induced geometric distortion effects and provide precise geographical coordinates of the ground data, the position and orientation of each laser pulse must be precisely measured, time-aligned and recorded. This process results in high-accuracy Digital Terrain Models (DTMs) that can be turned around in a matter of hours.

The DTM on the front cover is of the Keechlus earth dam in Washington State, USA. The image was obtained using Optech’s ALTM 1020 – 5 kHz, and Applanix’s POS/AV at 1000m AGL. There are eight separate flight lines tied together to create this image, which consists of approximately 100,000 points with a spot spacing of 25 to 50 cm and an elevation accuracy better than 10 cm. It took two minutes to collect this data.

For further information on POS/AV, contact Applanix Corporation at 905-475-2221, info@applanix.com, or www.applanix.com. For additional information on ALTM, contact Jim Green at Optech Inc., at 416-661-5904, jimg@optech.on.ca, or www.optech.on.ca.

Peer-Reviewed Articles (Click the linked titles to see the full abstract)

909 Correspondence Analysis for Principal Components Transformation of Multispectral and Hyperspectral Digital Images
James R. Carr and Korblaah Matanawi

Correspondence analysis captures 96 percent of the original image variance in its first principal component.

915 Object Recognition Based on Boundary Description
Y. Huang and J.C. Trinder

Objects in the scene are reconstructed by digital photogrammetry, while models in the database are generated by a CAD system.

923 Topographic Effects on the Texture of High-Resolution Forest-Stand Images Measured by the Semivariogram
Benoît St-Onge

Results show that topography affects texture mostly in sparse stands, and that the gradient-induced absolute error in the estimates of tree size and density is low.

937 A Moisture Index for Surface Characterization over a Semiarid Area
Lesley-Ann Dupigny-Giroux and John E. Lewis

A multispectral index, designed to describe surface moisture characteristics, was derived from the information content at the blue, near-infrared, and thermal wavelengths of Landsat TM imagery.

947 Deforestation in North-Central Yucatan (1985-1995): Mapping Secondary Succession of Forest and Agricultural Land Use in Sotuta Using the Cosine of the Angle Concept
Youngsinn Sohn, Emilio Moran, and Francisco Gurri

By calculating spectral angles between finely defined spectral clusters and known reference signatures, and assigning each spectral cluster to one of the reference classes based on the minimun-spectral-angle rule, we were able to map forest regrowth stages and agricultural land-use clases.

Yearbook
869 Building Fund
871 1999 Board of Directors
872 Region Map
873 ASPRS: The Imaging and Spatial Information Society
874 Installation of Officers
875 Inaugural Address
879 Executive Director Report
883 Award Recipients
889 Memorial Address: Spencer B. Gross
895 Memorial Address: Harl V. Pugh
899 Who’s Who in ASPRS

Announcements
888 ISPRS Awards
898 Pecora 14/Land Satellite Information III
921 Reviewers List
945 Call for Papers: DC 2000
946 CIG Application

Columns & Updates
851 In Memoriam — French, Kulhan, Boushahla, Kerkela
853 Grids & Datums — Philippines
855 Industry News

Departments
860 Software Review
866 New Members
906 Sustaining Members
908 Index to Advertisers
922 Instructions to Authors
936 Forthcoming Articles
959 Calendar
960 Classifieds
965 Bookstore
969 Professional Directory
974 Membership Application

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