PE&RS January 2003

Cover Image

This Landsat TM color composite draped over a lidar DEM of the Wapta Icefields in the Canadian Rockies. The lidar data were collected in October 2000 using an Optech Incorporated ALTM 1225 for the National Glaciology Program (NGP) of the Geological Survey of Canada. Otterburn Geographic was commissioned by the NGP to perform a resurvey in August 2002 using an Optech Incorporated ALTM 2050 to track ice surface feature movement and assess glacial mass balance. This project is one of many academic, industrial and government collaborative efforts taking place under the umbrella of the Canadian Consortium for Lidar Environmental Applications Research (C_CLEAR).

DEM generation and image drape by Chris Hopkinson, postdoctoral fellow in lidar research at the Laboratory for Remote Sensing of Earth and Environmental Systems, Queen’s University, Kingston, Ontario, Canada.

For more information, visit http://www.otterburn.ca, or contact Chris Hopkinson at chopkinson@cogeco.ca or at 613-384-8651.

Highlight Article

6 A Method for Improving Classification Accuracy and Acreage Assessments in Irrigated Crops
By Jan Cipra

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

33 Rational Functions and Potential for Rigorous Sensor Model Recovery
Kaichang Di, Ruijin Ma, and Ron Li

After improving the geopositioning accuracy of Ikonos Geo stereo imagery with ground control points by either refining the vendor-provided Ikonos RF coefficients or refining the RF-derived ground coordinates, the accuracy of 3D ground point determination was improved to 1 to 2 meters.

43 Error Tracking in Ikonos Geometric Processing Using a 3D Parametric Model
Thierry Toutin

The objectives of this study were to define the relationship between the final accuracy and the number and accuracy of input data, to track error propagation during the full geometric correction process (bundle adjustment and ortho-rectification), and to advise on the applicability of the model in operational environments.

53 Bias Compensation in Rational Functions for Ikonos Satellite Imagery
Clive S. Fraser and Harry B. Hanley

A practical method is derived for bias compensation in Ikonos rational functions, such that meter-level geopositioning can be routinely obtained with Geo imagery using standard photogrammetric workstations.

59 Block Adjustment of High-Resolution Satellite Images Described by Rational Polynomials
Jacek Grodecki and Gene Dial

For Ikonos satellite imagery, the Rational Polynomial Coefficient (RPC) block adjustment achieves the same accuracy as the ground station block adjustment with the full physical camera model.

71 Development and Calibration of the Airborne Three-Line Scanner (TLS) Imaging System
Tianen Chen, Ryosuke Shibasaki, and Murai Shunji

The calibration parameters have been used in several real test flights, and ground-point determination accuracies from 0.03 to 0.08 m (0.5.to 1.5 pixels) in planimetry and from 0.06 to 0.15 m (1.2 to 3 pixels) in elevation from a flying height of 500 m were attained.

79 An Algorithm for the Generation of Voronoi Diagrams on the Sphere Based on QTM
Jun Chen, Xuesheng Zhao, and Zhilin Li

The raster-based algorithm is capable of handling points, arcs, and area features on a spherical surface.

91 Making the Trade-Off Between Decision Quality and Information Cost
S. de Bruin and Gary J. Hunter

How decision analytical techniques were used to compare improved decision quality with increased information cost, in a case study that employed remotely sensed imagery to verify farmers’ declarations for a crop subsidy program in the European Union, is described.

Announcements
69 ASPRS 2003 Annual Conference
98 PE&RS Special Call for Papers - Advances in Systems for Spatial Data Processing, Analysis and Representation

Columns & Updates
9 Direct Georeferencing
13 ASPRS Standards
20 Grids & Datums — Mongolia
22 Headquarters News
24 Industry News

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29 Who’s Who in ASPRS
30 Sustaining Members
32 New Member List
32 Advertiser Index
42 Instructions to Authors
52 Forthcoming Articles
90 Calendar
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100 Bookstore
104 Professional Directory
107 Membership Application

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