Topographic effects in the downscaling of downwelling shortwave radiation

S. Sánchez-Ruiz; M. Campos-Taberner; B. Martínez; F. J. García Haro; M. A. Gilabert

doi:10.1117/12.2680152

19 October 2023 Topographic effects in the downscaling of downwelling shortwave radiation

S. Sánchez-Ruiz, M. Campos-Taberner, B. Martínez, F. J. García Haro, M. A. Gilabert

Proceedings Volume 12734, Earth Resources and Environmental Remote Sensing/GIS Applications XIV; 127341D (2023) https://doi.org/10.1117/12.2680152
Event: SPIE Remote Sensing, 2023, Amsterdam, Netherlands

Abstract

While satellite-derived Downwelling Surface Radiation (DSR) products offer coarse spatial resolution (10⁰ -10¹km²), regional and local applications (e.g. exploitation of solar energy, efficient building) require much finer spatial resolutions (⪅ 10³ m²). Although several DSR downscaling studies were conducted during the last decades considering topographic effects, only a few of them achieved the required spatial resolution for local applications and none of them evaluated the contribution of each effect. The current study proposes the downscaling of the MSG/SEVIRI DSR product (LSA-207), which recently included the fraction of diffuse radiation, from the original approximately 3 km × 3 km spatial resolution to approximately 30 m × 30 m based on topographic corrections. In addition, the effect of each correction (i.e. elevation, shadowing, and sky obstruction) in the final result is evaluated. Results are validated against ground measurements taken in 142 stations from the Servei Meteorologic de Catalunya –Catalan meteorology center– in North-East Spain, under different conditions (elevation, sky state, solar altitude) at 30 minutes temporal resolution. Shadowing caused the most noticeable changes in downscaled DSR across all elevations and sky states: about one percentage point (pp) reduction in Mean Bias Error (MBE). Correlation and Root Mean Squared Error (RMSE) remained similar pre- and post-downscaling. Greater differences were observed between clear and cloudy skies (respectively, correlations of 0.98 and 0.89-0.90, 3-4% and 6-7% relative MBE, 13-14% and 40% relative RMSE), and for solar altitude smaller than 20 degrees (30-40 pps in relative MBE).

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

S. Sánchez-Ruiz, M. Campos-Taberner, B. Martínez, F. J. García Haro, and M. A. Gilabert "Topographic effects in the downscaling of downwelling shortwave radiation", Proc. SPIE 12734, Earth Resources and Environmental Remote Sensing/GIS Applications XIV, 127341D (19 October 2023); https://doi.org/10.1117/12.2680152

ACCESS THE FULL ARTICLE

INSTITUTIONAL
Select your institution to access the SPIE Digital Library.

SELECT YOUR INSTITUTION

PERSONAL
Sign in with your SPIE account to access your personal subscriptions or to use specific features such as save to my library, sign up for alerts, save searches, etc.

PERSONAL SIGN IN

No SPIE Account? Create one

PURCHASE THIS CONTENT

SUBSCRIBE TO DIGITAL LIBRARY

50 downloads per 1-year subscription

Members: $195

Non-members: $335 ADD TO CART

25 downloads per 1 - year subscription

Members: $145

Non-members: $250 ADD TO CART

PURCHASE SINGLE ARTICLE

Includes PDF, HTML & Video, when available

Members: $17.00

Non-members: $21.00 ADD TO CART

PROCEEDINGS
6 PAGES

DOWNLOAD PAPER SAVE TO MY LIBRARY

GET CITATION

RIGHTS & PERMISSIONS

Get copyright permission Get copyright permission on Copyright Marketplace

KEYWORDS

Spatial resolution

Satellites

Shortwaves

Atmospheric optics

Bias correction

Solar energy

Statistical analysis

Show All Keywords

Keywords/Phrases

Search In:

Publication Years