Getting started with modis version 6 vegetation indices. It is an important ecohydrological parameter for understanding the pathways and feedbacks between climate and vegetation and for improving agricultural water management in a wide range of regions arora 2002a. Leaf area index lai and fraction of photosynthetically active radiation fpar modis, mod15a2c5 mosaic lai defines the number of equivalent layers of leaves relative to a unit of ground area, while fpar measures the proportion of available radiation in the photosynthetically active wavelengths that is absorbed by a canopy. Over 50 different global datasets are represented with daily, weekly, and monthly snapshots, and images are available in a variety of formats. These maps show monthly leaf area index from february 2000 to the present, produced using data collected by the moderate resolution imaging spectroradiometer modis.
The modeling and predicting of vegetation leaf area index lai is an important component of land surface model and assimilation of remote sensing data. Yuan, hua, dai, yongjiu, xiao, zhiqiang, ji, duoying, shangguan, wei source. Land surface and climate modelling requires continuous and consistent leaf area index lai. Myneni the authors are with the department of geography.
Modisterra leaf area indexfpar 8day l4 global 500m sin. Kustas, and yujie wang simple method for retrieving leaf area index from landsat using modis leaf area index products as reference, journal of applied remote sensing 61, 063554 18 july 2012. November 5, 2019 the mod15a2h version 6 moderate resolution imaging spectroradiometer modis combined leaf area index lai and fraction of photosynthetically active radiation fpar product is an 8day composite dataset with 500 meter m pixel size. Using the modis standard land cover and lai products, global lai climatologies and statistics were obtained for both pure and mixed. Called lai, for leaf area index, and fpar, for fraction of absorbed photosynthetically active radiation, both pieces. Changes in canopy cover with nasa modis leaf area index data. We are using wrfhydro to predict streamflow for fourmile creek at the orodell usgs gage for the 20 snowmelt period. For example, because of the influence of the cloud, aerosol, etc. The mcd15a3h v6 level 4, combined fraction of photosynthetically active radiation fpar, and leaf area index lai product is a 4day composite data set. The availability of spatially and temporally distributed information about lai is of crucial importance for climate change studies gcos107, 2006, sellers et.
From validation to algorithm improvement article pdf available in ieee transactions on geoscience and remote sensing 447. The mcd15a3h v6 level 4, combined fraction of photosynthetically active radiation fpar, and leaf area index lai product is a 4day composite data set with 500 meter pixel size. Modisterra leaf area indexfpar 8day l4 global 500m sin grid. Vertically, et is the sum of water vapor fluxes from soil evaporation, wet canopy evaporation and plant transpiration at dry canopy surface. Zhuo fu, jindi wang, jinling song, hongmin zhou, yong pang, and baisong chen estimation of forest canopy leaf area index using modis, misr, and lidar observations, journal of applied remote sensing 51, 053530 1 january 2011. Modelling and predicting of modis leaf area index time. Modisterra leaf area indexfpar 8day l4 global 500m sin grid v006 the mod15a2h version 6 moderate resolution imaging spectroradiometer modis combined leaf area index lai and fraction of photosynthetically active radiation fpar product is an 8. Today, scientists use nasa satellites to map leaf area index images processed to show how much of an area is covered by leaves. Modis global terrestrial evapotranspiration et product.
Reprocessing the modis leaf area index products for land. Modisterra leaf area indexfpar 8day l4 global 500m sin grid v006. Mod15a2h modisterra leaf area indexfpar 8day l4 global 500m sin grid v006. The seasonal secret was uncovered using leaf area measurements made by the moderate resolution imaging spectroradiometer modis. The moderate resolution imaging spectroradiometer modis sensor onboard nasas terra and aqua satellites can do just that by providing data that are used to calculate leaf area index lai. Spectral reflectances are somewhat sensitive to leaf chemistry, so the modis derived fpar and lai may represent some differences in leaf nitrogen content, but in an undetermined way. Index lai product mod15a2 was evaluated for the growing seasons of 2000 through 2004 in alaska. Modis leaf area index lai and fraction of photosynthetically active radiation absorbed by vegetation fpar product mod15 algorithm theoretical basis. Welcome to nasa earth observations, where you can browse and download imagery of satellite data from nasas earth observing system.
Modis 8day fpar is used as vegetation cover faction to quantify how much surface net radiation. Lai data sets for land surface and climate modelling. Fpar stage 1 pi product page url user guide download atbd doi. Synergistic algorithm for estimating vegetation canopy leaf area index and fraction of absorbed photosynthetically active radiation from modis and misr data y. The mod16 et algorithm runs at daily basis and temporally, daily et is the sum of et from daytime and night. Fraction of absorbed photosynthetically active radiation fapar version. Global monthly mean leaf area index climatology, 19812015. For example, type in leaf to bring up leaf area index data from the terra satellite mod, the aqua satellite myd, and data that are combined from both satellites mcd.
This page is now obsolete, as the modis lai data described here will be replaced by the yuan processed modis lai product in geoschem 12. Understanding the impact of vegetation mixture and misclassification on leaf area index lai estimation is crucial for algorithm development and the application community. Modisterra leaf area indexfpar 8day l4 global 500m sin grid v006 metadata updated. Science data sets provided in the mod15a2 include lai, fpar, a quality rating, and standard deviation for. Modis lai products meet these requirements to some degree. This composite image over the continental united states was produced with data acquired by the moderateresolution imaging spectroradiometer modis during the period march 24 april 8, 2000. Leaf area index lai is the ratio of the total onesided area of leaf tissue per unit ground surface area. This product is used in geoschem with the megan v2. Today, scientists use nasa satellites to map leaf area index images processed to show how.
High spatiotemporal resolution and longtime record data are more in demand nowadays and will continue to be in the future. The map above is a multiyear average of the leaf area index of the amazon based on terra modis data. However, the time series of modis lai contains some data of low quality. Simple method for retrieving leaf area index from landsat. Mod15a2h modis leaf area indexfpar 8day l4 global 500m sin grid. We want to obtain modis lai images for our region of interest and insert the processed images into our forcing time series so we can use dynamic lai in. Department of agriculture, agricultural research service, hydrology and. Synergistic algorithm for estimating vegetation canopy. The searchable table allows users to search for specific data products in the modis product table. Information about the modis version 6 vegetation indices products, changes between the version 5 and version 6 products, and how to access the data using nasas earthdata search is provided. For example, a leaf area index of one means the area is entirely covered by one layer of leaves. Variational retrieval of leaf area index from modis time.
Request pdf on jul 1, 2018, georgios ovakoglou and others published spatial enhancement of modis leaf area index using regression analysis with landsat vegetation index find, read and cite all. At boston university, a team of researchers is using modis data to create global estimates of the green leaf area of earths vegetation and how much sunlight the leaves are absorbing. The level4 modis global leaf area index lai and fraction of photosynthetically active radiation fpar product is a 8day 1kilometer resolution product on a sinusoidal grid. Anyone can help in explaining how i can apply quality control qc for modis leaf area index lai to extract the valid pixels of lai using arcmap. Simple method for retrieving leaf area index from landsat using modis leaf area index products as reference feng gao, amartha c. Reprocessing the modis leaf area index products for land surface and climate modelling author. The level4 modis global leaf area index lai and fraction of photosynthetically active radiation fpar product is a 8day 1kilometer resolution product on. Estimation of forest canopy leaf area index using modis. When using subsets of modisviirs land products from the ornl daac, please cite both the specific tools used and the specific data products. Modis observations also allow scientists to track two vital signs of earths vegetation. Science data sets provided in the mod15a2 include lai, fpar, a quality rating, and standard deviation for each variable. The lai estimate may be affected by three factors not directly related to canopy leaf area.
The green leaf area index lai, defined as half the surface area of green leaves per unit of ground area watson, 1947, is a requirement in a variety of ecological and agricultural applications sellers et al. Type in the specific short name of a product to find that product. The algorithm chooses the best pixel available from all the acquisitions of both modis sensors located on nasas terra and aqua. Modisterra leaf area index fraction of photosynthetically active. The mcd15a2h version 6 moderate resolution imaging spectroradiometer modis level 4, combined fraction of photosynthetically active radiation fpar, and leaf area index lai product is an 8day composite dataset with 500 meter pixel size. Citeseerx document details isaac councill, lee giles, pradeep teregowda. Mod15a2h modis leaf area index fpar 8day l4 global 500m sin grid v006. Reprocessing the modis leaf area index products for land surface and climate modelling. Modis leaf area indexfpar overview lai is defined as the onesided green leaf area per unit ground area in broadleaf canopies and as half the total needle surface area per. Lai is defined as the onesided green leaf area per unit ground area in broadleaf canopies and as onehalf the total needle surface area. The africa soil information service afsis moderate resolution imaging spectroradiometer modis collection leaf area index lai and photosynthetically active radiation fpar data sets contain rasters with the following calculations. Leaf area index variation for crop, pasture, and tree in. Spatial enhancement of modis leaf area index using. Analysis of modis leaf area index retrievals over broadleaf crops as a function of model and input uncertainties bin tan, dong huang, jiannan hu, wenze yang, ping zhang, nikolay v.
The leaf area index lai, which is commonly defined as half the total all. Analysis of leaf area index products from combination of modis terra and aqua data w. Analysis of leaf area index products from combination of. Have you ever wondered how many leaves there are in a forest. A synergistic algorithm for producing global leaf area index and fraction of. The citation is also sent in the email as plain text and bibtex file attachment along with the data retrieval instructions after the order is processed.
For example, a leaf area index of 1 means the area is entirely covered by one layer of leaves. This page describes the leaf area index product derived from the modis satellite instrument. Variational retrieval of leaf area index from modis time series data. Science data sets provided in the myd15a2 include lai, fpar, a quality rating, and standard deviation for each variable. Modis terra leaf area index fpar 8day l4 global 500m sin grid v006 the mod15a2h version 6 moderate resolution imaging spectroradiometer modis combined leaf area index lai and fraction of photosynthetically active radiation fpar product is an 8day composite dataset with 500 meter m pixel size. The image is a modis data product called leaf area index, which is produced by radiometrically measuring the visible and near infrared energy reflected by vegetation.
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