Assessment of downscaling methods for estimating evapotranspiration by combining MODIS and Landsat 8 images

Document Type : Original Article

Authors

1 M. Sc graduated, Water Engineering Department, Faculty of Agriculture, Razi University, Kermanshah, Iran.

2 Assistant Professor, Water Engineering Department, Faculty of Agriculture, Razi University, Kermanshah, Iran.

Abstract

Evapotranspiration (ET) is one of the most important parameters in agricultural water management which has spatial and temporal variations. Remote sensing-based algorithms of ET estimation have been applied in several studies. Using MODIS satellite images ET can be estimated on a daily basis at the pixel size of 1000 meters while using Landsat 8 images can be estimated every 16 days in the pixel size of 100 meters. Various methods are available for combining satellite images with low (such as MODIS) and medium (such as Landsat 8) spatial resolution to estimate evapotranspiration on a daily basis in the lower pixel size. Downscaling is one of these methods which was evaluated in this study is one of the plains in Kermanshah province. For this purpose, the actual ET over the study area was calculated during the summer of 2014 using the SEBAL algorithm based on six satellite images of Landsat 8 and MODIS. Although there are several methods for downscaling the estimated evapotranspiration based on MODIS images, in this study two simple downscaling methods (ratio and subtraction). were used to convert the Landsat 8 image scale. Results of downscaled images of MODIS were compared with the results of Landsat 8 images graphically and statistically. Given the fact of small size and mixed land use types in the study area results of downscaling methods were not acceptable.

Keywords

Main Subjects

References

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Advanced Technologies in Water Efficiency
Volume 2, Issue 2
July 2022
Pages 28-45

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History

  • Receive Date: 25 July 2021
  • Revise Date: 01 October 2021
  • Accept Date: 05 October 2021

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