Correction of sub-pixel topographical effects on land surface albedo retrieved from geostationary satellite (FengYun-2D) observations

L. Roupioz, L. Jia, F. Nerry, M. Menenti

Research output: Chapter in Book/Report/Conference proceedingConference paper

1 Citation (Scopus)

Abstract

The Qinghai-Tibetan Plateau is characterised by a very strong relief which affects albedo retrieval from satellite data. The objective of this study is to highlight the effects of sub-pixel topography and to account for those effects when retrieving land surface albedo from geostationary satellite FengYun-2D (FY-2D) data with 1.25km spatial resolution using the high spatial resolution (30 m) data of the Digital Elevation Model (DEM) from ASTER. The methodology integrates the effects of sub-pixel topography on the estimation of the total irradiance received at the surface, allowing the computation of the topographically corrected surface reflectance. Furthermore, surface albedo is estimated by applying the parametric BRDF (Bidirectional Reflectance Distribution Function) model called RPV (Rahman-Pinty-Verstraete) to the terrain corrected surface reflectance. The results, evaluated against ground measurements collected over several experimental sites on the Qinghai-Tibetan Plateau, document the advantage of integrating the sub-pixel topography effects in the land surface reflectance at 1km resolution to estimate the land surface albedo. The results obtained after using sub-pixel topographic correction are compared with the ones obtained after using pixel level topographic correction. The preliminary results imply that, in highly rugged terrain, the sub-pixel topography correction method gives more accurate results. The pixel level correction tends to overestimate surface albedo.

Original languageEnglish
Title of host publicationIOP Conference Series: Earth and Environmental Science
PublisherIOP Publishing
Volume17
Edition1
DOIs
Publication statusPublished - 2014
Event35th International Symposium on Remote Sensing of Environment, ISRSE 2013 - Beijing, China
Duration: 22 Apr 201326 Apr 2013

Publication series

NameIOP Conference Series: Earth and Environmental Science
PublisherIOP Publishing
ISSN (Print)1755-1307

Conference

Conference35th International Symposium on Remote Sensing of Environment, ISRSE 2013
CountryChina
CityBeijing
Period22/04/1326/04/13

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