Study of ecological land in China: conception, classification, and spatial-temporal pattern Landscape Spatial-Temporal Pattern Analysis on Change in the Fraction of Green Vegetation Based on Remotely Sensed Data:A Case Study in Haidian District, Beijing Spatial and temporal variation of solar radiation in recent 48 years in North China Spatial-Temporal Patterns of Grassland Degradation in Naqu of Northern Tibet Dynamic monitoring of fractional vegetation cover along Minjiang River from Wenchuan County to Dujiangyan City using multi-temporal landsat 5 and 8 images Spatial-temporal pattern and obstacle factors of cultivated land ecological security in major grain producing areas of Northeast China: A case study in Jilin Province.