PE&RS August 2001

Cover Image
This month’s cover is provided by LH Systems and shows parts of images collected with the new ADS40 Airborne Digital Sensor during test flights over Japan and Italy. The ADS40 is the first commercial airborne digital sensor based on the three-line principle. The focal plane contains a total of ten line sensors, each 12,000 pixels long. Each sensor line has its own filter. The two black and white images at the top were recorded over the region of Tsukuba, Japan, by PASCO Corporation of Tokyo. Flying height above ground is 6,300 feet (1,920 meters), ground sample distance (GSD) is 8 inches (20cm), and the swath width is 1.5 miles (2.4 km). The left image represents the raw image collected without stabilizing the sensor mount using IMU data. The right image shows the same line sensor data after rectification based on blended GPS/IMU data from the Applanix POS system supplied as an integral part of the ADS40. The lower color image was recorded over the city of Parma in northern Italy by Compagnia Generale Ripreseaeree of Parma. Flying height above ground is 4,720 feet (1,440 meters), GSD is 6 inches (15 cm) and the swath width is 1.1 miles (1.8 km). The color insert is an enlargment and serves to show the perfect co-registration of the red, green, and blue bands. Because  the sensitivities of these bands are non-overlapping, image processing is used to create color composites convenient for image interpretation.
For more information contact LH Systems at walker@lh-systems.com or www.lh-systems.com.

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

909 Single-Photo Resection Using the Modified Hough Transform
Ayman Habib and Devin Kelley

The modified Hough Transform single-photo resection facilitates the fusion of digital imagery with terrestrial mobile mapping data, GIS data, and line maps, and can be applied to change detection. 

915 Radiometric Corrections for Multispectral Airborne Video Imagery
A. Edirisinghe, G.E. Chapman, and J.P. Louis

The development and the assessment of the accuracy of vignetting correction procedures, including an investigation into wavelength shift in band-pass windows, for a multispectral airborne video image system is described. 

925 On Preserving Spectral Balance in Image Fusion and Its Advantages for Geological Image Interpretation
Ernst M. Schetselaar

A method that preserves the spectral balance of the multispectral image data and modulates the intensity (I), hue (H), and saturation (S) coordinates uniformly is presented. 

935 Unveiling the Lithology of Vegetated Terrains in Remotely Sensed Imagery
Robert E. Crippen and Ronald G. Blom

Lithologic patterns within open canopy forests are revealed by selectively suppressing image contrasts attributable to variations in vegetative abundance. 

947 Integration of Hyperspectral and IFSAR  Data for Improved 3D Urban Profile Reconstruction
P. Gamba and B. Houshmand

Two classification schemes were evaluated for airborne AVIRIS hyperspectral data, and the quality of DEMs generated from AIRSAR radar was assessed as a function of view angle. 

957 Model-Based Conifer-Crown Surface Reconstruction from High-Resolution Aerial Images
Yongwei Sheng, P. Gong, and G.S. Biging

A conifer crown is modeled as a generalized hemi-ellipsoid, the optimal tree model is established using a geometric equation, and the optimal tree model is applied to guide a conventional pyramidal image matching for crown-surface reconstruction. 

967 A Spatio-Temporal GIS Database for Monitoring Alpine Glacier Change
Jeremy L. Mennis and Andrew G. Fountain

A temporal GIS is developed to integrate diverse sources of historic and contemporary glacier data and to investigate changes in glacier geometry over time. 

Announcements
923 ASPRS-ACSM 2002 Conference
945 Measuring the Earth — Digital Elevation Technologies
966 CALL FOR NOMINATIONS — 28th Annual Presentation William T. Pecora Award
975 CALL FOR Papers: Characterizing and  Modeling Landscape Dynamics
Cover 3 Integrating Remote Sensing at the Global, Regional, and Local Scale

Columns & Updates
889 Remote Sensing
893 In Memoriam — Eldon Wagner
897 Grids & Datums — The Swiss Confederation
899 Headquarters News
901 Industry News

Departments
906 Sustaining Members
908 Index to Advertisers
908 New Members
944 Instructions to Authors
965 Forthcoming Articles
976 Calendar
977 Classifieds
979 Bookstore
983 Professional Directory
987 Membership Application

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