In aerial photography, the primary factor is terrain undulation. However, most of the external aerial photography software used for aerial photography design do not take terrain undulation influence into consideration...In aerial photography, the primary factor is terrain undulation. However, most of the external aerial photography software used for aerial photography design do not take terrain undulation influence into consideration. Therefore, the design result has comparative randomicity and "gaps" are expected. An aerial photography design system is developed by analyzing the terrain undulation influence to the design result with DEM data so that the forward overlap and side overlap can be justified according to the block terrain undulation to meet specifications or standards. The data designed by this system is compared with the real flying data. The results show that making use of DEM to assist in aerial photography design can ensure that the designed result fits the real terrain better.展开更多
新型城镇化的建设和管理经常涉及到多源异构时空数据的集成和协同应用,其中基础地理数据因具有数据描述信息可被快速识别,有些数据如实时感知数据等,因没有描述信息而难以被识别,使得数据无法及时共享应用。因此,本文分析了不同新型城...新型城镇化的建设和管理经常涉及到多源异构时空数据的集成和协同应用,其中基础地理数据因具有数据描述信息可被快速识别,有些数据如实时感知数据等,因没有描述信息而难以被识别,使得数据无法及时共享应用。因此,本文分析了不同新型城镇化途径下时空数据共享应用需求,总结了时空数据的时间属性、空间属性和内容属性在共享应用中的作用,并从其可共享性快速识别的角度出发,以时空数据的时间、空间和内容等属性为主要内容设计了一个轻量级的时空数据共享信息描述框架(description framework of spatial data sharing information,DFSDSI)实现多标准时空本体数据共享特征的统一表达,从而为城镇多源异构时空数据可共享性的快速识别提供判断依据。展开更多
文摘In aerial photography, the primary factor is terrain undulation. However, most of the external aerial photography software used for aerial photography design do not take terrain undulation influence into consideration. Therefore, the design result has comparative randomicity and "gaps" are expected. An aerial photography design system is developed by analyzing the terrain undulation influence to the design result with DEM data so that the forward overlap and side overlap can be justified according to the block terrain undulation to meet specifications or standards. The data designed by this system is compared with the real flying data. The results show that making use of DEM to assist in aerial photography design can ensure that the designed result fits the real terrain better.
文摘新型城镇化的建设和管理经常涉及到多源异构时空数据的集成和协同应用,其中基础地理数据因具有数据描述信息可被快速识别,有些数据如实时感知数据等,因没有描述信息而难以被识别,使得数据无法及时共享应用。因此,本文分析了不同新型城镇化途径下时空数据共享应用需求,总结了时空数据的时间属性、空间属性和内容属性在共享应用中的作用,并从其可共享性快速识别的角度出发,以时空数据的时间、空间和内容等属性为主要内容设计了一个轻量级的时空数据共享信息描述框架(description framework of spatial data sharing information,DFSDSI)实现多标准时空本体数据共享特征的统一表达,从而为城镇多源异构时空数据可共享性的快速识别提供判断依据。