Validation of MODIS FAPAR in the Hulunber grassland of China

Li Gang; Zhang Hua; Fan Wenjie; Zhang Hongbin; Xin Xiaoping

Volume 26 Issue 12

Dec. 2010

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Abstract

Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE) > 2010 > 26(12): 217-224.

Li Gang, Zhang Hua, Fan Wenjie, Zhang Hongbin, Xin Xiaoping. Validation of MODIS FAPAR in the Hulunber grassland of China[J]. Transactions of the Chinese Society of Agricultural Engineering (Transactions of the CSAE), 2010, 26(12): 217-224.

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Validation of MODIS FAPAR in the Hulunber grassland of China

Li Gang^1,2,3,
Zhang Hua³,
Fan Wenjie⁴,
Zhang Hongbin^1,2,3,
Xin Xiaoping^1,2,3

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Received Date: May 04, 2010
Revised Date: November 02, 2010
Published Date: December 30, 2010

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Abstract

Abstract

The accuracy validation of the MODIS/FAPAR product is a prerequisite for using it to estimate local net primary production (NPP), and to supply service for monitoring the balance of region carbon and arranging production of grassland animal husbandry rationally. For this purpose, we designed and carried out in-situ measurements of FAPAR in two 2 km×2 km areas within the temperate meadow-steppe grassland in Hulunber during growing season in 2008, and analyzed heterogeneity of the two sites using image of Beijing-1 satellite with resolution of 32 m, and then scaled up and validated MODIS/FAPAR products with in-situ measured data in grassland area. The results showed that the MODIS FAPAR product reflected very well the seasonal dynamics of in-situ FAPAR, but tended to overestimate the value with averaged relative error of 13.7% in the Stipa Baicalensis site and 18.7% in the Leymus Chinensis site. The MODIS/FAPAR algorithm was derived based on the global land cover map, which may be too broad for local areas. More fieldworks for various types of the grasslands are necessary.
- remote sensing,
- grassland,
- MODIS,
- FAPAR,
- NDVI,
- validation,
- Hulunber

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