Under the background of intensifying global change, frequent occurrence agrometeorological disasters has an adverse impact on social economy. Low-temperature weather in spring is one main Xinjiang. Studying spatial and temporal characteristics low temperatures Xinjiang great significance. However, research spatiotemporal variation frost arid areas currently lacking, which limits our understandi...

Air pollution has become one of the important concerns environmental in Beijing–Tianjin–Hebei region. As an city Beijing–Tianjin–Hebei, Shijiazhuang long been ranked bottom ten terms air quality country. In order to effectively grasp influencing factors and current distribution City, this paper collects data on top pollutants from 2017 2019, analyzes characteristics time changes region, uses Kr...

ÐThis paper investigates temporal changes of topological relationships and thereby integrates two important research areas: First, two-dimensional topological relationships that have been investigated quite intensively and, second, the change of spatial information over time. We investigate spatio-temporal predicates, which describe developments of well-known spatial topological relationships. ...