PE&RS September 1997

Cover Image

This digital color infrared image mosaic was collected over agricultural fields in Illinois using a system developed by TASC, Inc. The sensor system consists of a Kodak 460 digital camera, and onboard GPS and navigation equipment, and was designed for ease of installation on a fixed-wing aircraft. The system also includes automated mission planning software to simplify imagery acquisition over target areas. Location and attitude data are collected simultaneously with the imagery. After the image-collection missions are complete, images are corrected geometrically and radiometrically, and merged in an automated mosaicking process using specialized software developed at TASC. The end results are 1-meter resolution digital imagery in TIFF format, with associated geo-referencing information. The system and processing capabilities were designed to support rapid data collection, processing, and dissemination of imagery (48- to 72-hour turnaround) for high-volume applications in agriculture, forestry, and natural resource management. For further information, please visit the website at http://www.emerge.wsicorp.com.

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

1067 A New Approach to Precision Airborne GPS Positioning for Photogrammetry
Clyde C. Goad and Ming Yang

A fully automatic approach to resolve phase integers and perform airborne GPS positioning for aerial triangulation using dual-frequency GPS data is developed.  

1079 Aerotriangulation and DEM/Orthophoto Generation from High-Resolution Still-Video Imagery
Hans-Gerd Maas and Thomas Kersten

The potential of employing digital cameras onboard an aircraft is discussed.  

1085 Mobile Mapping: An Emerging Technology for Spatial Data Acquisition
Rongxing Li

Issues related to the basic principle, data processing, automation, achievable accuracies, and a breakdown of errors are given.  

1093 Heuristic Reasoning Strategy for Automated Sensor Placement
Scott Mason

A heuristic reasoning strategy that automates the placement of sensors in the design of multi-station convergent close-range photogrammetric networks is presented.  

1103 Hemispherical Photographs Used for Mapping Confined Spaces
Michel Boulianne, Clément Nolette, Jean-Paul Agnard and Martin Brindamour

Two Methods, based on the correction of fisheye images, have been successfully tested for mapping confined areas such as electric distribution wells.  

1111 Constrained FEM Self-Calibration
D.D. Lichti and M.A. Chapman

A modified finite element approach to analytical self-calibration is proposed.  

1121 Relations between the Coefficients in the Projective Transformation Equations and the Orientation Elements of a Photograph
Kasuo Kobayashi and Chuji Mori

The relations between photo coordinates and object coordinates are written in two ways: as projective transformation equations and as the collinearity equations with orientation elements.  

1129 Accuracy of Plates Calibrated by an Automatic Comparator
Georges Blaha

Using a master plate free of systematic errors, as previously calibrated under laboratory conditions, it was determined how well a specific automatic monocomparator could calibrate a new series of plates.

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