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Remote Sensing for Land & Resources    2020, Vol. 32 Issue (1) : 90-97     DOI: 10.6046/gtzyyg.2020.01.13
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Comparison of change characteristics of NDVI in mountain basin before and after atmospheric correction
Dongya CHENG, Xudong LI()
School of Geography and Environmental Science, Guizhou Normal University, Guiyang 550025, China
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Abstract  

Atmospheric correction is an important part of remote sensing image processing. It is of theoretical significance to explore the characteristics of normalized difference vegetation index (NDVI) and its terrain gradient before and after atmospheric correction. This paper draws the following conclusions: ① The NDVI obtained without atmospheric correction is generally underestimated in space. ② The NDVI obtained without atmospheric correction cannot reflect the trend and proportional relationship of each stage. The NDVI without atmospheric correction has serious deviation, and the NDVI is more than 0.6. The absolute error is over 20%. ③ Whether the atmospheric correction is made or not affects the NDVI change trend and the numerical value of each altitude; the absolute error increases below 1 000 m, and the absolute error fluctuation decreases thereafter. ④ Whether the atmospheric correction is made or not has an effect on the slope NDVI trend and value; as the slope increases, the absolute error first rises and then falls, and the slope (45°, 50° ) absolute error is the largest. ⑤ Whether the atmospheric correction is made or not has an effect on the NDVI trend of each slope; the absolute error of west slope is the largest, and the east slope is the smallest.
Keywords NDVI      terrain gradient effect      atmospheric correction      Baoxi River Basin      mountain basin     
:  TP79  
Corresponding Authors: Xudong LI     E-mail: 616507732@qq.com
Issue Date: 14 March 2020
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Dongya CHENG,Xudong LI. Comparison of change characteristics of NDVI in mountain basin before and after atmospheric correction[J]. Remote Sensing for Land & Resources, 2020, 32(1): 90-97.
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https://www.gtzyyg.com/EN/10.6046/gtzyyg.2020.01.13     OR     https://www.gtzyyg.com/EN/Y2020/V32/I1/90
Fig.1  Altitude of the Baoxi River Basin
Fig.2  Spatial distribution of slope and aspect of the Baoxi River Basin
Fig.3  Spatial distribution of NDVI before and after atmospheric correction
Fig.4  NDVI spatial error without atmospheric correction
NDVI NDVINAC NDVIAC 误差/% 绝对误差/%
像元数量 占比/% 累计占比/% 像元数量 占比/% 累计占比/%
[-1.0,0) 663 0.36 0.36 20 0.01 0.01 0.35 0.35
[0,0.1) 756 0.41 0.77 229 0.12 0.13 0.28 0.28
[0.1,0.2) 1 253 0.68 1.44 457 0.25 0.38 0.43 0.43
[0.2,0.3) 2 007 1.08 2.52 624 0.34 0.72 0.75 0.75
[0.3,0.4) 3 309 1.78 4.31 932 0.50 1.22 1.28 1.28
[0.4,0.5) 6 708 3.62 7.93 1 552 0.84 2.06 2.78 2.78
[0.5,0.6) 30 950 16.69 24.62 2 401 1.30 3.35 15.40 15.40
[0.6,1.0] 139 757 75.38 100.00 179 188 96.65 100.00 -21.27 21.27
合计 185 403 100.00 — 185 403 100.00 — — —
Tab.1  Comparison of NDVI classification characteristics before and after atmospheric correction
Fig.5  Altitude characteristics of NDVI changes before and after atmospheric correction
Fig.6  Gradient characteristics of NDVI changes before and after atmospheric correction
Fig.7  Aspect characteristics of NDVI changes before and after atmospheric correction
Fig.8  Comparison of basic spatial trends of calculated data and verification data in NDVI space
Fig.9  Comparison of NDVI pixel ratio changes between calculated data and verification data
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