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Reprocessed MODIS Version 6.1 Leaf Area Index dataset

dataset
posted on 2023-01-12, 11:08 authored by Wanyi LinWanyi Lin, Hua Yuan, Wenzong Dong, Shupeng Zhang, Shaofeng Liu, Nan WeiNan Wei, Xingjie Lu, Zhongwang Wei, Yongjiu Dai

Introduction

The leaf area index (LAI) data sets were generated by reprocessing the MODIS version 6.1 LAI products.

The raw data used include the MODIS LAI Version 6.1 products MCD15A2H (2002.7.4-2021), MOD15A2H (2000.2.18-2002.6.26) (Myneni et al., 2021) and MODIS Land Cover Type product MCD12Q1 (2001-2021) (Friedl and Sulla-Menashe, 2022).

The algorithm is mainly based on the two-step integrated method developed by Yuan et al. (2011), and the method of background value calculation was updated.

  • For each year being reprocessed, the nearest 9-year data include itself are used.
  • We use the corresponding year's land cover data for calculating the multi-year average, local per class mean, per class mean and multi-year per class mean (ref. Fig. 4, Yuan et al., 2011).

Data description

These monthly LAI data were provided at 0.5-degree resolution covering the period 2000-2021. Data of each year is stored in one NetCDF file, namely lai_monthly_0.5_{YEAR}.nc.

For LAI data with more spatial or temporal resolutions, see Land-Atmosphere Interaction Research Group at Sun Yat-sen University (bnu.edu.cn).

Caution

The reprocessed data for downloading consists two MODIS version 6.1 products, i.e., MCD15A2H (2002.7.4-2021) and MOD15A2H (2000.2.18-2002.6.26). The prefix “MCD” stands for a combined product, whose algorithm chooses the best pixel available from all the acquisitions of both MODIS sensors located on NASA’s Terra and Aqua satellites, while “MOD” data are retrieved only from the Terra satellite. We have found that their temporal-mean values were different especially in the equatorial region, which may result in an unrealistic trend (see Lin et al., 2022 for detailed discussion). Therefore, attention should be paid when using the reprocessed products for long-term trend analysis and data starting from year 2003 (i.e., only MCD) was recommended for LAI trend study. 

Data citation

  1. Lin, W. et al., 2022. Reprocessed MODIS Version 6.1 Leaf Area Index dataset and its evaluation for land surface and climate modeling. Submitted.
  2. Yuan, H., Dai, Y., Xiao, Z., Ji, D., Shangguan, W., 2011. Reprocessing the MODIS Leaf Area Index Products for Land Surface and Climate Modelling. Remote Sensing of Environment, 115(5), 1171-1187. doi:10.1016/j.rse.2011.01.001

History

Publisher

4TU.ResearchData

Time coverage

2000-2021

Geolocation

Global

Format

NetCDF

Organizations

Sun Yat-sen University