کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4374776 1617201 2016 9 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Evaluating the level of agreement between human and time-lapse camera observations of understory plant phenology at multiple scales
ترجمه فارسی عنوان
ارزیابی سطح توافق بین مشاهدات دوربین بین انسان و زمان باقی مانده از فنولوژی گیاه بوته در مقیاس های مختلف
کلمات کلیدی
MODIS، رزولوشن تصویری رزولوشن متوسط؛ NDVI، شاخص عادی گیاه شناسی؛ FOV، میدان دید، عکاسی تکراری دیجیتال؛ نظارت زیست محیطی؛ MODIS؛ فنولوژي؛ سنجش از دور؛ کوه های راکی؛ پوشش گیاهی خرس گریزلی
موضوعات مرتبط
علوم زیستی و بیوفناوری علوم کشاورزی و بیولوژیک بوم شناسی، تکامل، رفتار و سامانه شناسی
چکیده انگلیسی


• We compared the agreement between two methods of observing understory phenology.
• We determined the number of cameras required to capture phenology at multiple scales.
• Observations were made of the physical–structural development of two species.
• There is very high agreement between the observation methods and across scales.
• There are some patterns and biases to be aware of when employing time-lapse cameras.

The growing popularity of digital-repeat photography in field research is seeing traditional field efforts being assisted and even replaced by low-cost cameras. The efficiency of using cameras is obvious, but there is an assumption that they capture the same information as observations made by humans. This paper aims to determine the level of agreement between these two methods of interpreting understory vegetation phenology. We compared daily phenological observations made by low-cost cameras with those made by personnel during field visits every 10 days. Phenophases were defined as the non-spectral, physical developmental stages of Canadian buffaloberry (Shepherdia canadensis) and alpine sweetvetch (Hedysarum alpinum). The relationship between observation methods was quantified using a weighted kappa statistic at three spatial scales ranging from individual plants to areas up to 6 ha. Agreement between the camera observations and those made by field personnel was nearly perfect (Kappa > 0.9) for both the vegetative and reproductive phenology of both study species at all spatial scales. The level of agreement was found to be more variable early in the season when plant growth is more rapid. Overall there was a slight bias in the image interpretations to underestimate the rate of development. Time-lapse photography was found to be an analogous replacement for field visits; however, some plant species are more suitable for observation by camera than others. Spatially, it was determined that observations of a single plant are all that is required to capture the phenology of the surrounding region in excess of 6 ha. This analysis was carried out over a single growing season in the in the Rocky Mountains of western Alberta, Canada.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Ecological Informatics - Volume 33, May 2016, Pages 1–9
نویسندگان
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