Mapping vineyard leaf area with multispectral satellite imagery

被引:200
作者
Johnson, LF
Roczen, DE
Youkhana, SK
Nemani, RR
Bosch, DF
机构
[1] NASA, Ames Res Ctr, Div Earth Sci, Moffett Field, CA 94035 USA
[2] Calif State Univ Monterey Bay, Seaside, CA 93955 USA
[3] VESTRA Resources Inc, Redding, CA 96002 USA
[4] Univ Montana, Numer Terradynam Simulat Grp, Missoula, MT 59812 USA
[5] Robert Mondari Winery, Oakville, ON 94562, Canada
关键词
satellite remote sensing; leaf area; geospatial technology; precision viticulture;
D O I
10.1016/S0168-1699(02)00106-0
中图分类号
S [农业科学];
学科分类号
09 ;
摘要
Vineyard leaf area is a key determinant of grape characteristics and wine quality. As is frequently the case in agriculture, available ground-based leaf area measurements employed by growers are not well suited to larger area mapping. In this study, IKONOS high spatial resolution, multispectral satellite imagery was used to map leaf area throughout two commercial wine grape vineyards (approximately 800 ha) in California's North Coast growing region. The imagery was collected near harvest during the 2000 growing season, converted to at-sensor radiance, geo-referenced and transformed to normalized difference vegetation index (NDVI) on a per pixel basis. Measurements at 24 ground calibration sites were used to convert NDVI maps to leaf area index (LAI: m(2) leaf area m(-2) ground area); planting density was then used to express leaf area on a per vine basis (LA(v)). Image-based LA(v) was significantly correlated with ground-based LA, estimates developed at 23 validation sites (r(2) = 0.72; P < 0.001). Despite challenges posed by the discontinuous nature of vineyard canopies and architectural differences imposed by shoot positioning trellis systems, remote sensing appears to offer a basis for mapping vineyard leaf area in low LAI vineyards. Such maps can potentially be used to parameterize plant growth models or provide decision support for irrigation and canopy management. (C) 2002 Elsevier Science B.V. All rights reserved.
引用
收藏
页码:33 / 44
页数:12
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