Statistical Gap-Filling of SEVIRI Land Surface Temperature

0524079 - ÚI 2021 RIV CH eng J - Journal Article
Dumitrescu, A. - Brabec, Marek - Cheval, S.
Statistical Gap-Filling of SEVIRI Land Surface Temperature.
Remote Sensing. Roč. 12, č. 9 (2020), č. článku 1423. E-ISSN 2072-4292
Institutional support: RVO:67985807
Keywords : land surface temperature * gap-filling * ERA5 land skin temperature * generalized additive model
OECD category: Statistics and probability
Impact factor: 4.848, year: 2020
Method of publishing: Open access

A reliable and practically useable method for gap filling in hourly Spinning Enhanced Visible and Infrared Imager (SEVIRI LST) data using ERA5 Land Skin Temperature (ERA5ST) co-variate and additional easily accessible data (elevation, time, solar radiation info) is proposed. The suggested approach provides estimates to all weather conditions and it is based on a probabilistic model via modern regression models. We have tested two classes of regression models of different complexity and flexibility, namely multiple linear regression (MLR), and generalized additive model (GAM). This analysis uses as main input the hourly LST data set over Romania, through 2016 and 2017, extracted from MSG-SEVIRI images, which is an operational product of the Land Surface Analysis–Satellite Application Facility (LSA-SAF). The comparison between the estimated LST and the original LST values shows that GAM model, that takes into account the distance between missing LST locations and the nearest non-missing locations (GAM2), provides the best results, hence this was used to fill the gaps from the analyzed remote sensing product. Considering the fact that the best covariate (ERA5ST) has global coverage and it is available at high spatial resolution and temporal resolution, the proposed approach could be also used to perform the gap-filling of other existing LST remote sensing products.
Permanent Link: http://hdl.handle.net/11104/0308416