[1]FAN Dong,XUE Huazhu,DONG Guotao,et al.Downscaling Study on TRMM 3B43 Data of the Heihe River Basin Based on Quadratic Polynomial Regression Model[J].Research of Soil and Water Conservation,2017,24(02):146-151.
Copy
Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume:
24
Number of periods:
2017 02
Page number:
146-151
Column:
Public date:
2017-04-28
- Title:
-
Downscaling Study on TRMM 3B43 Data of the Heihe River Basin Based on Quadratic Polynomial Regression Model
- Author(s):
-
FAN Dong1,2, XUE Huazhu1, DONG Guotao2, JIANG Xiaohui2, ZHANG Wenge2, YIN Huijuan2, GUO Xinwei2
-
1. School of Surveying and Land Information Engineering, Henan Polytechnic University, Jiaozuo, He’nan 454000, China;
2. Key Laboratory of Soil and Water Loss Process and Control on the Loess Plateau, Ministry of Water Resources, Yellow River Institute of Hydraulic Research, Zhengzhou 450003, China
-
- Keywords:
-
downscaling of TRMM data; quadratic polynomial regression model; DEM; NDVI; Heihe River Basin
- CLC:
-
P332.1
- DOI:
-
-
- Abstract:
-
Precipitation data with high accuracy and high spatial resolution are important to ecology, hydrology and meteorology. In this study, we established a Quadratic Polynomial Regression Model (QPRM) between TRMM 3B43 precipitation, Digital Elevation Model (DEM) data and Normalized Difference Vegetation Index (NDVI) on four different scales (0.25°, 0.50°, 0.75° and 1.00°), and the TRMM 3 B430.25°×0.25° precipitation fields were downscaled to 1 km×1 km for each year from 2001 to 2013. The downscaled precipitation estimates were subsequently validated against the in-situ observation data obtained from nine rain gauge stations in the period of 13 years in the Heihe River Basin. The results showed that both spatial resolution of data and the data quality were significantly improved. Compared with multiple linear regression model downscaling method, the downscaled result obtained by QPRM is more accurate and closer to the measurements from rain gauges. The modeling scale has a great influence on the accuracy of the downscaled results, and 0.50° is the optimal scale to obtain high spatial resolution precipitation by downscaling TRMM 3B43 products using DEM and NDVI data.