Satellite positioning technology has been widely used in all kinds of military and civil land, marine, space and aeronautical target positioning tasks, naviga tion activities and accurate surveying measurements since ...Satellite positioning technology has been widely used in all kinds of military and civil land, marine, space and aeronautical target positioning tasks, naviga tion activities and accurate surveying measurements since 90 s in the last cen tury due to its advantage in providing all-weather, real-time, three dimensional and high precision positioning information, as well as speed and accurate timing information. By now, it has already formed a new hi-tech industry basically.This paper briefly reviews the development of the global satellite positioning and navigation technologies including the basic information of China's "Plough navigation system", introduces the history of satellite positioning technology and its major application fields as well as the status quo of this being industri alized trade in China, gives an account of the writers' vision for the application and prospect of the satellite positioning technologies in China, and approaches the tactics and stresses of the satellite positioning technology's application and its industrialization future in China.展开更多
Land use and protection has become a global hot spot.How to use land resources is an important topic for the future socio-economic sustainable development.This paper analyzes the land use changes of Mata lake of Shand...Land use and protection has become a global hot spot.How to use land resources is an important topic for the future socio-economic sustainable development.This paper analyzes the land use changes of Mata lake of Shandong province in China,from 1985's to 2000's using multi-temporal remotely sensed data including TM in the 1985s,ETM+in the 2000s and ancillary data such as soil use map,water map etc.The remote sensing imageries were calibrated,registered and geo-referenced,then classified by multi-source information data and remote sensing image interpretation expert system based on knowledge base.Five land use types were extracted from remote sensing imageries,that is,water body,agriculture land,rural settlement,bare land and none-use land.The total precision is 80.7% and Kappa index is 0.825.The analysis result of the remote sensing shows that during the past 15 years,water resource dropped off very promptly from 51.77 km2 to 16.65 km2 and bare land reduced greatly more than 60% in Mata lake region.With the development of the economy and agriculture areas,more and more water body and bare land converted to agriculture land use and rural settlement areas.Since last years,the Mata lake has been affected by natural factor,human activity and increasing population.So its land use pattern greatly changed from 1985 to 2000.The information of land use changes provided scientific supports for land planning and environmental protection.展开更多
文摘Satellite positioning technology has been widely used in all kinds of military and civil land, marine, space and aeronautical target positioning tasks, naviga tion activities and accurate surveying measurements since 90 s in the last cen tury due to its advantage in providing all-weather, real-time, three dimensional and high precision positioning information, as well as speed and accurate timing information. By now, it has already formed a new hi-tech industry basically.This paper briefly reviews the development of the global satellite positioning and navigation technologies including the basic information of China's "Plough navigation system", introduces the history of satellite positioning technology and its major application fields as well as the status quo of this being industri alized trade in China, gives an account of the writers' vision for the application and prospect of the satellite positioning technologies in China, and approaches the tactics and stresses of the satellite positioning technology's application and its industrialization future in China.
基金Minist ry of Land and Resources and Geological Survey of China Foundation(121201050511)
文摘Land use and protection has become a global hot spot.How to use land resources is an important topic for the future socio-economic sustainable development.This paper analyzes the land use changes of Mata lake of Shandong province in China,from 1985's to 2000's using multi-temporal remotely sensed data including TM in the 1985s,ETM+in the 2000s and ancillary data such as soil use map,water map etc.The remote sensing imageries were calibrated,registered and geo-referenced,then classified by multi-source information data and remote sensing image interpretation expert system based on knowledge base.Five land use types were extracted from remote sensing imageries,that is,water body,agriculture land,rural settlement,bare land and none-use land.The total precision is 80.7% and Kappa index is 0.825.The analysis result of the remote sensing shows that during the past 15 years,water resource dropped off very promptly from 51.77 km2 to 16.65 km2 and bare land reduced greatly more than 60% in Mata lake region.With the development of the economy and agriculture areas,more and more water body and bare land converted to agriculture land use and rural settlement areas.Since last years,the Mata lake has been affected by natural factor,human activity and increasing population.So its land use pattern greatly changed from 1985 to 2000.The information of land use changes provided scientific supports for land planning and environmental protection.
