Skip to Main Content
U.S. Forest Service
Caring for the land and serving people

United States Department of Agriculture

Home > Search > Publication Information

  1. Share via EmailShare on FacebookShare on LinkedInShare on Twitter
    Dislike this pubLike this pub
    Author(s): Neil A. Clark
    Date: 2000
    Source: Proceedings, SO FOR GIS 2000, 3rd Southern Forestry GIS Conference. D1: 6 pp.
    Publication Series: Miscellaneous Publication
    PDF: View PDF  (73.09 KB)


    Three hundred and nine width measurements at various heights to 10 m on a metal light pole were calculated from video images captured with a prototype video-laser rangefinder instrument. Data were captured at distances from 6 to 15 m. The endpoints for the width measurements were manually selected to the nearest pixel from individual video frames.

    Chi-square analysis shows that 95 percent of measurements can be expected to be within 13 mm of the actual. All errors lower than -13 mm were on nearly horizontal images. Poor contrast causing poor edge detection was the source of most of this error. All errors greater than 13 mm occurred between rows 280 and 390 on the image. Improper focus seemed to be the main contributor to positive errors. Improvements to the camera and lens system should improve these results considerably.

    Publication Notes

    • You may send email to to request a hard copy of this publication.
    • (Please specify exactly which publication you are requesting and your mailing address.)
    • We recommend that you also print this page and attach it to the printout of the article, to retain the full citation information.
    • This article was written and prepared by U.S. Government employees on official time, and is therefore in the public domain.


    Clark, Neil A. 2000. Initial results from a video-laser rangefinder device. Proceedings, SO FOR GIS 2000, 3rd Southern Forestry GIS Conference. D1: 6 pp.

    Related Search

    XML: View XML
Show More
Show Fewer
Jump to Top of Page