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نویسندگان
چکیده
A fundamental challenge in river analysis and modelling is the lack of readily available and reliable information on river bank geometry. Traditional survey methods are expensive and time consuming and often difficult to execute in many river systems because of hazardous terrain or lack of access. However, as high quality aerial and satellite imagery becomes available for more of the globe, it is increasingly possible to extract these bank locations directly from imagery. The most direct method of doing this involves manually designating edges based on visual criterion. This, however, is often prohibitively time consuming and labour intensive, and the quality is dependent on the individual doing the task. This paper describes a quick and fully automated method for locating water surface and river banks in high resolution aerial imagery without recourse to any multispectral information, by segmenting based on the local entropy of the image. Thismethod is demonstrated on imagery of several rivers and its advantages and limitations are discussed. Published 2013. This article is a U.S. Government work and is in the public domain in the USA. key words: remote sensing; rivers; Shannon entropy; shoreline Received 12 September 2012; Revised 8 May 2013; Accepted 23 July 2013
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The public reportmg burden for th1s collection of mformation is estimated to average 1 hour per response. includmg the time for rev>ewing instruct>ons. searclhing existing data sources. gathering and mmnta1mng the data needed. and completing and rev1ew1ng the collection of 1nforma t1 on. Send comments regarding th1s burden est1mate or any other aspect o fth1s collection of mformat1on . 1nclud1n...
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The public reportmg burden for th1s collection of mformation is estimated to average 1 hour per response. includmg the time for rev>ewing instruct>ons. searclhing existing data sources. gathering and mmnta1mng the data needed. and completing and rev1ew1ng the collection of 1nforma t1 on. Send comments regarding th1s burden est1mate or any other aspect o fth1s collection of mformat1on . 1nclud1n...
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The public reportmg burden for th1s collection of mformation is estimated to average 1 hour per response. includmg the time for rev>ewing instruct>ons. searclhing existing data sources. gathering and mmnta1mng the data needed. and completing and rev1ew1ng the collection of 1nforma t1 on. Send comments regarding th1s burden est1mate or any other aspect o fth1s collection of mformat1on . 1nclud1n...
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