Qingming Zhan

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With the development of information techniques and the need of digital earth and cyber city, the three dimensional (3D) information play much more important role in presentation and illustration of historical buildings. 3D modeling and virtual reality techniques have demonstrated the ability of visualizing the real world in three dimension space which(More)
Remote sensing in urban areas has been a challenge for quite some time due to complexity and fragmentation of objects and the combination of man-made features and natural features. Airborne laser altimetry data offer possibilities for feature extraction and spatial modelling in urban areas. There are many approaches of deriving buildings and other features(More)
High-resolution remotely sensed imagery and airborne laser altimetry data offer exciting possibilities for feature extraction and spatial modelling in urban areas. In this study, hierarchical image objects have been generated by image segmentation based on IKONOS imagery and laser scanning data using semantically meaningful thresholds. Delaunay(More)
Shadow effects have drawn much attention by researchers with increasing use of high-resolution remote sensing images of urban areas. For correction or compensation to pixels that falling in shadow areas due to the existence of vertically standing objects such as buildings and trees, quantitative analysis of shadow effects is essential. In this paper, we(More)
Remote sensing in urban areas has been a challenger for quite some time due to their complexity and fragment with combination of man-made features and natural features. High-resolution satellite images and airborne laser altimetry data offered potential possibilities for feature extraction and spatial modelling in urban areas. Land use classification of(More)
For automatic processing of point clouds, the segmentation is a key but difficult step. Many researchers have tried to develop segmentation methods including edge-based segmentation, surface-based segmentation and color-based segmentation, and so on. In this paper, we present a point data segmentation method based on normal vector estimation and color(More)
Current characterization of the Urban Heat Island (UHI) remains insufficient to support the effective mitigation and adaptation of increasing temperatures in urban areas. Planning and design strategies are restricted to the investigation of temperature anomalies at a city scale. By focusing on Land Surface Temperature of Wuhan, China, this research examines(More)