independence day resurgence download cloud

The proposed Python tool aims to build a new data extraction technique and to improve the accessibility of data to future researchers, utilizing the freely available libraries in the Python programing language with the ability to be translated into other programing languages. In this article, a quick and efficient, self-adaptive Python tool for the acquisition, and analysis of cloud segmentation properties that is applicable to images from all-sky image repositories is presented and a case study demonstrating its usage and the overall efficacy of the technique is demonstrated. The technique can be used to develop repeatable HEV hazard evaluations for human ocular health applicationsĪcquiring the reflectance, radiance, and related structural cloud properties from repositories of historical sky images is a challenging and a computationally intensive task, especially when performed manually or by means of nonautomated approaches.

The method when applied to global solar radiation data correlates well with measured HEV within the solar zenith angle range 60° and 80° (R2 = 0.82 mean bias error (MBE) = −1.62%, mean absolute bias error (MABE) = 10.3% and root mean square error (RMSE) = 14.6%). A method is presented for calculating HEV irradiance at sub-tropical latitudes from the more commonly measured global solar radiation (300–3000 nm) for all cases when clouds do and do not obscure the sun. The enhancement of “bluing” of the sky due to the influence of clouds was found to increase significantly with the amount of cloud. This research has investigated the effect of clouds on HEV for low solar elevation (solar zenith angles between 60° and 80°), simulating time periods when the opportunity for ocular exposure in global populations with office jobs is high during the early morning and late afternoon. The sun is the source of HEV which reaches the Earth’s surface either directly or after scattering by the atmosphere and clouds. Both chronic and acute exposure to these wavelengths has been often highlighted as a cause for concern with respect to ocular health.

Solar blue-violet wavelengths (380−455 nm) are at the high energy end of the visible spectrum referred to as “high energy visible” (HEV).

Independence day resurgence download cloud