干旱区生态环境知识资源中心(Arid): Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin

Arid

DOI	10.3390/s19051139
	Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin
	Snyder, Keirith A.1; Huntington, Justin L.2; Wehan, Bryce L.1; Morton, Charles G.2; Stringham, Tamzen K.3
通讯作者	Snyder, Keirith A.
来源期刊	SENSORS
ISSN	1424-8220
出版年	2019
卷号	19 期号:5
英文摘要	Phenology of plants is important for ecological interactions. The timing and development of green leaves, plant maturity, and senescence affects biophysical interactions of plants with the environment. In this study we explored the agreement between land-based camera and satellite-based phenology metrics to quantify plant phenology and phenophases dates in five plant community types characteristic of the semi-arid cold desert region of the Great Basin. Three years of data were analyzed. We calculated the Normalized Difference Vegetation Index (NDVI) for both land-based cameras (i.e., phenocams) and Landsat imagery. NDVI from camera images was calculated by taking a standard RGB (red, green, and blue) image and then a near infrared (NIR) plus RGB image. Phenocam NDVI was calculated by extracting the red digital number (DN) and the NIR DN from images taken a few seconds apart. Landsat has a spatial resolution of 30 m(2), while phenocam spatial resolution can be analyzed at the single pixel level at the scale of cm(2) or area averaged regions can be analyzed with scales up to 1 km(2). For this study, phenocam regions of interest were used that approximated the scale of at least one Landsat pixel. In the tall-statured pinyon and juniper woodland sites, there was a lack of agreement in NDVI between phenocam and Landsat NDVI, even after using National Agricultural Imagery Program (NAIP) imagery to account for fractional coverage of pinyon and juniper versus interspace in the phenocam data. Landsat NDVI appeared to be dominated by the signal from the interspace and was insensitive to subtle changes in the pinyon and juniper tree canopy. However, for short-statured sagebrush shrub and meadow communities, there was good agreement between the phenocam and Landsat NDVI as reflected in high Pearson's correlation coefficients (r > 0.75). Due to greater temporal resolution of the phenocams with images taken daily, versus the 16-day return interval of Landsat, phenocam data provided more utility in determining important phenophase dates: start of season, peak of season, and end of season. More specific species-level information can be obtained with the high temporal resolution of phenocams, but only for a limited number of sites, while Landsat can provide the multi-decadal history and spatial coverage that is unmatched by other platforms. The agreement between Landsat and phenocam NDVI for short-statured plant communities of the Great Basin, shows promise for monitoring landscape and regional-level plant phenology across large areas and time periods, with phenocams providing a more comprehensive understanding of plant phenology at finer spatial scales, and Landsat extending the historical record of observations.
英文关键词	phenocams Landsat NDVI semi-arid cold desert sagebrush pinyon and juniper meadows StarDot cameras camera-based repeat digital photography
类型	Article
语种	英语
国家	USA
开放获取类型	Green Submitted, Green Published, gold
收录类别	SCI-E
WOS记录号	WOS:000462540400158
WOS关键词	DIGITAL REPEAT PHOTOGRAPHY ; GRASSLAND ; PHENOCAMS ; MODIS ; MONITOR ; CLIMATE ; IMAGERY ; SURFACE ; SYSTEM ; TRENDS
WOS类目	Chemistry, Analytical ; Engineering, Electrical & Electronic ; Instruments & Instrumentation
WOS研究方向	Chemistry ; Engineering ; Instruments & Instrumentation
来源机构	Desert Research Institute
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/218839
作者单位	1.USDA ARS, Great Basin Rangelands Res Unit, Reno, NV 89512 USA; 2.Desert Res Inst, Reno, NV 89512 USA; 3.Univ Nevada, Dept Agr Vet & Rangeland Sci, Reno, NV 89557 USA
推荐引用方式 GB/T 7714	Snyder, Keirith A.,Huntington, Justin L.,Wehan, Bryce L.,et al. Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin[J]. Desert Research Institute,2019,19(5).
APA	Snyder, Keirith A.,Huntington, Justin L.,Wehan, Bryce L.,Morton, Charles G.,&Stringham, Tamzen K..(2019).Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin.SENSORS,19(5).
MLA	Snyder, Keirith A.,et al."Comparison of Landsat and Land-Based Phenology Camera Normalized Difference Vegetation Index (NDVI) for Dominant Plant Communities in the Great Basin".SENSORS 19.5(2019).