An improved temperature vegetation dryness index （iTVDI）and its applicability to drought monitoring

Using Moderate Resolution ImagingSpectroradiometer （MODIS） data from the dry seasonduring 2010-2012 over the whole Yunnan Province,an improved temperature vegetation dryness index（iTVDI）, in which a parabolic dry-edge equationreplaces the traditional linear dry-edge equation, wasdeveloped, to reveal...

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Bibliographic Details
Published in:山地科学学报：英文版 2017, Vol.14 (11), p.2284-2294
Main Authors: YANG Ruo-wen, WANG Hai, HU Jin-ming, CAO Jie, YANG Yu
Format: Article
Language:English
Subjects:
Drought
dry-edge
equation
Improved
index
iTVDI
Lineardry-edge
monitoring
Parabolic
Soilmoisture
temperature
vegetationdryness
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Summary:Using Moderate Resolution ImagingSpectroradiometer （MODIS） data from the dry seasonduring 2010-2012 over the whole Yunnan Province,an improved temperature vegetation dryness index（iTVDI）, in which a parabolic dry-edge equationreplaces the traditional linear dry-edge equation, wasdeveloped, to reveal the regional drought regime inthe dry season. After calculating the correlationcoefficient, root-mean-square error, and standarddeviation between the iTVDI and observed topsoilmoisture at 10 and 2o cm for seven sites, theeffectiveness of the new index in depicting topsoilmoisture conditions was verified. The drought areaindicated by iTVDI mapping was then compared withthe drought-affected area reported by the localgovernment. The results indicated that the iTVDI canmonitor drought more accurately than the traditionalTVDI during the dry season in Yunnan Province.Using iTVDI facilitates drought warning andirrigation scheduling, and the expectation is that thisnew index can be broadly applied in other areas.
ISSN:1672-6316
1993-0321