Results 271 to 280 of about 98,513 (306)
Some of the next articles are maybe not open access.
Prediction of leaf area index in almonds by vegetation indexes
Computers and Electronics in Agriculture, 2012Three levels of scale for determining leaf area index (LAI) were explored within an almond orchard of alternating rows of Nonpareil and Monterey varieties using hemispherical photography and mule lightbar (MLB) at ground level up to airborne and satellite imagery.
Jose L. Zarate-Valdez +5 more
openaire +1 more source
Scale Effect in Indirect Measurement of Leaf Area Index
IEEE Transactions on Geoscience and Remote Sensing, 2016Scale effect, which is caused by a combination of model nonlinearity and surface heterogeneity, has been of interest to the remote sensing community for decades. However, there is no current analysis of scale effect in the ground-based indirect measurement of leaf area index (LAI), where model nonlinearity and surface heterogeneity also exist.
Guangjian Yan +6 more
openaire +1 more source
Variation of specific leaf area and upscaling to leaf area index in mature Scots pine
Trees, 2006Reliable and objective estimations of specific leaf area (SLA) and leaf area index (LAI) are essential for accurate estimates of the canopy carbon gain of trees. The variation in SLA with needle age and position in the crown was investigated for a 73-year-old Scots pine (Pinus sylvestris L.) stand in the Belgian Campine region.
Xiao, Chun-Wang +3 more
openaire +2 more sources
Indirect Estimation of Leaf Area Index in VSP-Trained Grapevines Using Plant Area Index
American Journal of Enology and Viticulture, 2013Leaf area index (LAI) and canopy structure are important parameters affecting grape quality and yield of grapevines. Two different experimental protocols as well as the average LAI value of the different protocols for indirect estimation of LAI by gap fraction analysis in VSP-trained grapevines (Vitis vinifera L. cv. Riesling) were tested in this study
Doering +4 more
openaire +1 more source
Estimating leaf area index from satellite data
IEEE Transactions on Geoscience and Remote Sensing, 1993A method for estimating leaf area index from visible and near infrared measurements of vegetation above a soil background is applied to a Landsat Thematic Mapper data set. Some constants required for the procedure are inferred from the scattergram of data values.
openaire +1 more source
Leaf area index mapping in northern Canada
International Journal of Remote Sensing, 2011In this study, a new LAI algorithm was developed with particular emphasis over northern Canada using a much finer resolution of remotely sensed data and in situ measurements collected over a wide range of northern arctic vegetation. A statistical relationship was developed between the in situ LAI measurements collected over vegetation plots in northern
Abdelgadir A. Abuelgasim +1 more
openaire +1 more source
Vegetative Development: Total Leaf Area and Surface Area Indexes
2010Canopy management determines canopy shape and spatial leaf area distribution which in turn determines vineyard productivity. There are two indexes evaluating vineyard productivity which involve leaf development: total leaf area – LAI – and external leaf area – SA –. The first one refers to total leaf area developed per m2 of soil while SA refers to the
Patricia Sánchez-de-Miguel +3 more
openaire +1 more source
ESTIMATION OF LEAF AREA INDEX IN SOME BREBA FIG CULTIVARS
Acta Horticulturae, 2008Determination of leaf area index which is a key factor in many physiological processes in plants plays a crucial role. Despite the difficulty of measurement, without a suitable instrument it is quite time consuming and destructive. The exact measurement of leaf area index requires the measurement of the total leaf area of the canopy.
openaire +3 more sources
Journal of Applied Remote Sensing, 2012
Leaf area index (LAI) is a key parameter in most land surface models. Models that operate at multiple spatial scales may require consistent LAI inputs at different spatial resolutions or from different sensors. For example, the atmosphere-land exchange inverse model and associated disaggregation algorithm (DisALEXI) use the moderate resolution imaging ...
openaire +1 more source
Leaf area index (LAI) is a key parameter in most land surface models. Models that operate at multiple spatial scales may require consistent LAI inputs at different spatial resolutions or from different sensors. For example, the atmosphere-land exchange inverse model and associated disaggregation algorithm (DisALEXI) use the moderate resolution imaging ...
openaire +1 more source