排序方式： 共有97条查询结果，搜索用时 15 毫秒
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基于MapX的公安110报警系统的设计与实现 总被引：3，自引：1，他引：2
在分析GIS应用于公安部门现状的基础上,综合应用MapX技术和Oracle数据库技术,进行GIS二次开发,为某市公安部门设计并实现一套110报警系统.简要说明MapX的主要功能与模型结构,阐述本系统的功能,结构和实现方法.对其中的关键技术和算法作以介绍. 相似文献
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多级工程控制网相对点位精度的合理评定 总被引：1，自引：0，他引：1
本文分析、探讨了多维工程控制网中,平面控制点的相对点位精度。指出了现有计算公式的不尽合理,提出了客观、合理地评定相对点位精度的新方法。它既顾及起始数据的误差影响,同时又采用了符合实际需要的协方差参考基准。 相似文献
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Environmental pollution in the Gulf of Guinea (GOG) coastal zone has caused eutrophication and oxygen depletion in the lagoon systems, particularly around the urban centres, resulting in decreased fish (reproduction) levels and waterborne diseases. A pollution sources assessment was undertaken by six countries in the region as a first step in defining a region-wide Environmental Management Plan. Results show that households produce 90% of solid waste. Industry, however, is responsible for substantial amounts of hazardous waste, specifically the Nigerian petroleum industry. The latter is also responsible for the spilling of large amounts of oil. BOD load from industrial effluents is slightly larger than domestic loads in the industrialised coastal zone. Wastewater treatment systems are either absent or inadequate. Apart from large-scale gas flaring in Nigeria, air pollution, in terms of COx, HC, NOx and SO2 emissions, is contributed mainly by traffic. Particulates, originate mainly from industries and domestic biomass burning. 相似文献
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