PE&RS April 1998

Cover Image

Stark white glaciers, blue icy lakes, and thick ‘red’ forests are portrayed in this color infrared (CIR) image of our planet. This photograph was taken over Glacier National Park in Montana by HJW (Hammon, Jensen, Wallen, & Associates, Inc.) during a park-wide aerial photography mission for ESRI (Environmental Systems Research Institute, Inc.). As part of an ongoing effort by the National Park Service to perform vegetation-mapping, ESRI hired HJW to provide CIR film of Glacier National Park and its environs. The photography is being used to perform a vegetation inventory; to monitor disturbance factors caused by fire, insects, drought, disease, and climate change; and to analyze wildlife habitat. Photographs from the fly-over are also being used to help determine suitable locations for Park Service management facilities.

 This 1:12000-scale CIR photograph was flown at an altitude of ~14,500' with a Zeiss RMK TOP camera. Over a ten-day period in August 1997, HJW acquired over 900 1:24000-scale CIR photographs over the entire 1,600 square mile national park and 1:12000-scale photography over selected areas. Though severe weather patterns created difficult flying conditions, only nature’s beauty is evident in this image of our Earth.

 For more information, please contact HJW–Imaging the Earth, 1-800-383-2991; www.hjw.com.

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

273 A Modified Contextual Classification Technique for Remote Sensing Data
K.M.S. Sharma and A. Sarkar

Instead of using the spectral information at each pixel to predict the class of that pixel independently of the observations at other pixels, contextual techniques utilize the information from neighboring pixels as well. 

281 Exact Binomial Confidence Interval for Proportions
Jeffrey T. Morisette and Siamak Khorram

Confidence intervals are described and a formula for an exact, equal tailed confidence interval for proportions as used in most accuracy assessment reports is presented. 

285 Forest Area Estimation Using Sample Surveys and Landsat MSS and TM Data
F. Deppe

The direct expansion method produced rapid and independent area estimates while results from the regression estimator method showed narrower confidence intervals, indicating higher accuracy. 

293 An Efficient and Accurate Method for Mapping Forest Clearcuts in the Pacific Northwest Using Landsat Imagery
Warren B. Cohen, Maria Fiorella, John Gray, Eileen Helmer, and Karen Anderson

Forest clearcuts between 1972 and 1993 were mapped with greater than 90 percent accuracy by unsupervised classification of a five time-interval image difference data set. 

301 Effectiveness of the MCC Method in Detecting Oceanic Circulation Patterns at a Local Scale from Sequential AVHRR Images
Jay Gao and Matthew B. Lythe

The maximum cross-correlation coefficient method is able to accurately detect oceanic circulation patterns if the detected results from multiple image pairs are averaged and tested at the 99 percent significance level. 

309 Mapping Altered Rocks Using Landsat TM and Lithogeochemical Data: Sulphurets-Brucejack Lake District, British Columbia, Canada
J.R. Harris, A.N. Rencz, B. Ballantyne, and C. Sheridon

Areas of iron-pyrite and phyllic (sericitic) alteration as well as areas of intense silicification have been located using band ratioing techniques. 

323 Scale-Space Methods for Image Feature Modeling in Vision Metrology
C.S. Fraser and Juliang Shao

A vision-based measurement system applicable for use in two-dimensional industrial inspection is described. 

329 GPS-Controlled Strip Triangulation Using Geometric Constraints of Man-Made Structures
Hamid Ebadi and Michael A. Chapman

A new technique for GPS-controlled single-strip triangulation using geometric constraints of man-made structures (e.g., high voltage towers, high rise buildings) located approximately along the flight line is described. 

Highlight Article

Engineering Applications of Airborne Scanning Lasers: Reports From the Field
Bill Gutelius

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