Chinese Journal of Agrometeorology ›› 2012, Vol. 33 ›› Issue (04): 587-594.doi: 10.3969/j.issn.1000-6362.2012.04.017

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Response of Vegetation Index Based on MODIS to Topographic Factors in Chongqing

CHEN Yan ying，TANG Yun hui，ZHANG Jian ping,YOU Yang sheng,YANG Xue mei   

  1. 1Chongqing Institute of Meteorological Sciences，Chongqing 401147,China;2College of Civil Engineering，Chongqing University，Chongqing 400045;3Key Laboratory of New Technology for Construction of Cities in Mountain Area,Ministry of Education /Chongqing University，Chongqing 400030
  • Received:2012-02-09 Online:2012-11-20 Published:2013-02-26

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Abstract: Based on the daily MODIS data under clear sky condition from March to November 2011 in Chongqing，authors computed the 10-day (monthly，yearly) NDVI by using MVC method.The serial NDVI enlarged 100 times in different period of time were divided into 6 characteristic districts with different altitudes which were below 400m，400-800m，800-1200m，1200-1500m，1500-2000m and above 2000m and 5 characteristic districts with different slopes which were below 5°，5°-15°，15°-25°，25°-35° and above 35°，and the NDVI of each district was analyzed.The results showed that (1) The NDVI augmented with the increase of altitude or lope NDVI in districts below 1500m increased conspicuously and the added value was 3.5 to 8.7 between neighboring districts，but in districts above 1500m increased inconspicuously and the added value was <1.9 between neighboring districts NDVI in districts below 25°increased conspicuously and the added value was 3.0 to 8.0，but in the districts above 25°increased inconspicuously and the added value was 0.2 to 1.0(2)According to analysis，in higher districts，the grid frequency of NDVI above the average augmented with the increase of altitude.The correlation coefficient between NDVI and altitude was 0.9552（P＜0.01）while that between NDVI and slope was -0.3000.The results showed that the grid frequency of NDVI above the average augmented with increase of altitude while there was no significant correlation between grid frequency of NDVI above the average and slope.(3)The difference of NDVI in different districts was reflected more conspicuously by altitude division than by slope division.The correlation coefficient was more than 0.9541 between NDVI and altitude（P＜0.001）,and was 0.9457-0.9723 between NDVI and slope（P＜0.01）.All the results above showed that in Chongqing city，the topographic factors had obvious effect on NDVI，and the effect of altitude on NDVI was more conspicuously than that of slope.

Key words: Chongqing city, Characteristic district with different altitude, Characteristic district with different slope, NDVI

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