PE&RS April 2004

Cover Image
The cover image is a true color compositeof a hyperspectral image collected over Crater Lake, Oregon by the Hymap sensorowned by HyVista Corporation. Hymapchannel 14 (0.6439 mm) is loaded to the red color gun, channel 8 (0.5557 mm) to the green color gun, and channel 2 (0.4665mm) to the blue color gun. The scene shows the western edge of Crater Lake, includingWizard Island. Crater Lake partially fills a caldera that was formed by the collapse of 3,700 m of Mount Mazama during an explosive eruption approximately 7,700 years ago. The aldera wall displays the geologic layering of lava flows through time. Following the climactic eruption, it took perhaps 250 years of rain and snow accumulation for the caldera to fill to its present-day lake level. Wizard Island is a cinder cone built up by repeated explosive eruptions long after the initial explosion. Recent estimates date the last activity of the Wizard Island cone at about 800 years ago. Theinset images show the Hymap image draped over a USGS 10 m DEM, and pixel spectra of various materials from the scene, illustrating the high spectral resolution of the Hymap sensor. All images and plots were generated in the ENVI image processing software, by RSI.The highlight article (pg.377-380) provides information about the benefits of working with hyperspectral imagery. For more information contact http://www.hyvista.com.

Highlight Article

377 Why Use Hyperspectral Imagery? (Adobe PDF 250kb)
Peg Shippert

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

397 An Accurate and Automated Approach to Georectification of HDF-EOS Swath Data
Wenli Yang and Liping Di

An accurate and fully automated georectification algorithm, which is especially suitable for wide viewing angle Earth observing satellite data in NASA’s standard data format, is described and implemented.

405 Assessing the Accuracy of National Land Cover Dataset Area Estimates at Multiple Spatial Extents
Jeffrey W. Hollister, M. Liliana Gonzalez, John F. Paul,Peter V. August, and Jane L. Copeland

Accuracy of area estimates for different land-use/land-cover classes is shown to vary with the spatial extent of the sampling unit upon which the area measurement is determined, and relatively poor accuracy is found more often in smaller sampling units.

415 Combining Non-Parametric Models for Multisource Predictive Forest Mapping
Zhi Huang and Brian G. Lees

A new strategy that combines several models based on different principles not only provides estimates of confidence, but also improves the mapping accuracy.

427 An Initial Study on Automatic Reconstruction of Ground DEMs from Airborne IfSAR DSMs
Yun Zhang, C. Vincent Tao, and J. Bryan Mercer

An automatic IfSAR DEM reconstruction approach with algorithm implementation and testing results is described.

439 The Characteristics and Interpretability of Land Surface Change and Implications for Project Design
Terry L. Sohl, Alisa L. Gallant, and Thomas R. Loveland

Mixtures of algorithm-based detection and manual interpretation may often prove to be the most feasible and appropriate design for change-detection applications.

451 Validation and Calibration of Canada-WideCoarse-Resolution Satellite Burned-AreaMaps
R.H. Fraser, R.J. Hall, R. Landry, T. Lynham, D. Raymond, B. Lee, and Z. Li

Continental-scale burned-area maps derived from SPOT VGT and NOAA/AVHRR satellite imagery were validated and calibrated using a large sample of Landsat TM scenes.

461 Satellite Observations of the Seasonal Vegetation Growth in Central Asia: 1982-1990
Fangfang Yu, Kevin P. Price, James Ellis, and Dietrich Kastens

The date of onset of vegetation green-up was found to be most consistent for the forest ecosystem, while the desert steppe was characterized by high year-to-year variations in onset date.

Announcements
386 ASPRS Annual Conference — ...Mountains of Data — Peak Decisions...
Call for Papers — PE&RS Special Issue on Mapping Mars
449 PE&RS Reviewers

Columns & Updates
381 Direct Georeferencing — Real-time AirborneMapping System for Forest Fire Fighting (F3)System (Adobe PDF 175kb)
387 Grids & Datums — Republic of Vanuatu
391 Book Review
393 Industry News

Departments
395 Who’s Who in ASPRS
396 Advertiser Index
426 Instructions to Authors
450 Forthcoming Articles
470 New Member List
529 Calendar
530 Classifieds
532 Bookstore
536 Professional Directory
539 Membership Application

Resource 2004
472 Introduction
473 Sustaining Members
475 Corporate Descriptions
525 ASPRS Code of Ethics

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