[word=and] [!lemma=□]
[word=and] [!lemma=economic]
This need has not been fully addressed by a quarter century of spaceborne remote sensing systems operating in the visible and near-infrared region of the electromagnetic spectrum . Dwarfing rootstocks reduce tree size by up to 75 % , so that a tree may be only 8 , 12 , or 15 feet tall when mature , depending upon its rootstock , scion variety , and growing conditions . This commitment is based on the legal responsibilities placed on employers by the Sex Discrimination Act 1975 , the Race Relations Act 1976 , the Disability Discrimination Act 1995 and on the recognition that groups and individuals can be subject to discrimination on a variety of grounds such as sex , gender ( including homosexual orientations ) , gender re-assignment , colour , ethnic or national origin , age ( subject to University retirement conventions ) , socio-economic background , disability , religious or political beliefs , family circumstances and union membership . While many volcanoes experience periods of unrest and deformation that do not culminate in major eruptions , it is likely that many ( perhaps most ) of the world 's volcanoes that actually do erupt experience significant preeruption surface deformation ( Newhall and Dzurisin , 1988 ; Thatcher , 1990 ; Shimada et al ., 1990 ) . Finally , the polarization combination of the received backscatter is dependent on the polarization of the transmitted microwave power and on the horizontal and / or vertical orientation of the scattering elements present in the vegetation . Especially in high-relief terrain , topography influences intercepted solar radiation , precipitation and runoff , evaporation , snow ablation , soil moisture , and vegetation type and health . Visible and near-infrared sensors have been used extensively to measure snow-covered area .