کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
8906214 | 1634094 | 2018 | 11 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A timelapse camera dataset and Markov model of dust devil activity at Eldorado playa, Nevada, USA
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
علم هواشناسی
پیش نمایش صفحه اول مقاله
![عکس صفحه اول مقاله: A timelapse camera dataset and Markov model of dust devil activity at Eldorado playa, Nevada, USA A timelapse camera dataset and Markov model of dust devil activity at Eldorado playa, Nevada, USA](/preview/png/8906214.png)
چکیده انگلیسی
We report a May-June 2015 survey of dust devil activity on a Nevada desert playa using an inexpensive digital timelapse camera. We discuss techniques for exploiting the large volume of data (â¼32,700 images, made publicly-available) generated in these observations, similar to imaging from Mars landers and rovers, noting the diurnal image filesize variations as a useful quick-look metric of weather conditions. We present results from a semi-automated image classification: this classification is available to other workers, for example for benchmarking automated procedures. The acquisition of images at 1/min for some 36â¯days permits study of the diurnal variation of dust devil activity (e.g. 85% of the dust devil images [i.e. those images manually classified as showing dust devils] occur between 12:00 and 17:00; during the period of peak activity 13:00-15:00 about 7% of images contain well-defined dust devils of several meters diameter or larger). The data also permit the dependence of dust devil characteristics on ambient conditions. We construct a simple two-state Markov model for the occurrence and persistence of dust devils (a few per cent chance that new dust devil activity appears in the next image; and a â¼45% chance that activity stops) which may help inform strategies for acquiring and interpreting field observations.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Aeolian Research - Volume 33, August 2018, Pages 33-43
Journal: Aeolian Research - Volume 33, August 2018, Pages 33-43
نویسندگان
Ralph D. Lorenz, Brian K. Jackson, Peter D. Lanagan,