The covered area of Da Lian City C level GPS under the control of net is 17,000km2.Sea area among them is 4700km2,contain to 8 island and islet of changshan archipelago which is unequal in size, 8 nets distribute between islands,the distance is 20—30km between land and coastal water island and islet;
Cadastral database is an important branch of land and resources databases,and the effective management of cadastral database is a guarantee to the application and sustainable development of cadastral management information system.
With related techniques provided by Skyline,3D database platform is built. Then based on this platform,the monographic information about land resources is added. Finally,combined with visibility integrated environment Visual Studio 2003,and used Develop Kit of TerraDeveloper,application of 3D GIS in land resources information management has been realized.
利用Skyline提供的相关技术,建立了3D数据库平台,并在此基础上添加了相应的国土资源专题信息,最后利用开发包TerraDeveloper结合可视化集成开发环境Visual Studio 2003对3D GIS技术在国土资源信息管理中的应用进行了实现。
The author analyse the major problems in the evaluation of land lot price exist currently in the technology and methods,and put forward a plan to develop the land lot price evaluation information system (LLPEIS) based on GIS. Not only the authour analyse the feasibility of the plan,but also make a deep discussion on the conjunct methods of GIS and the specialized model of land price evaluation.
Our study indicates that the model can be applied to study the interaction between land surface processes and atmospheric boundary layers over various underlying surfaces and their regional climate effects.
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Regularities of wind-erosion of different land-use types in Yongding River sandy land, Beijing
例句来源
The threshold wind velocity of a number of variables was studied in four different land-use types: farm land, forestland, wild grassland and a flood plain in the Yongding River sandy land in Beijing.
例句来源
The following conclusions were drawn: 1) The order of decreasing threshold of wind speed for sand displacement and surface roughness were forestland, wild grassland, farm land, sparse wild grassland and flood plain.
例句来源
At a height of 0-20 cm, the height increased while the sediment discharge percent of sand flux decreased; there were significant differences in the sand flow formation under different land-use types.
The no staff and self-reducing tacheometer is a new type of surveying instrument designed and constructed by a group of teachers and students of our department. This instrument can be used for topographic and tacheometric measurements with low degree of accuracy for geographic and geological details, and also for land and forest valuations. The most distinguished advantage of this instrument lies in the fact that there is no necessity to place a staff at the point to be sighted, and the horizontal di...
The materials of present report were collected from reconnaissence soil survey of Kwangtung and Kwangsi provinces in 1958—1960. Soils investigated include yellow earths, red earths and lateritic soils. They are developed under natural vegetations of tropic monsoon forest (secondary), subtropic evergreen broadleaf forest, conifer and broadleaf mixed forest, subalpine dwarfing and bamboo ferests, confer forests of Cunninghamia lanceolata and Pinus massoniana, and grass land. A few samples of rice paddy ...
本文对华南地区不同植被下的土壤有机貭、土壤活性矿物貭組成及枯枝落叶层进行了研究,企图探求植被类型对于土壤腐殖貭組成以及肥力变化的影响。供試土壤包括山地草甸土、黃壤、紅壤及砖紅壤性紅壤,由不同母貭发育而成。植被类型包括常綠闊叶林、針叶闊叶混交林、高山矮林及竹林、杉木林、馬尾松灌丛、草坡等。此外,还选了三个珠江三角洲地区不同肥力的水稻土,以比較自然植被下土壤性貭和农田土壤性貭的异同。根据初步研究結果,获得下列几点认識。 1.土壤活性腐殖质的变化两广地区自然植被下的土壤,其活性腐殖貭占土壤有机貭总量的百分比显然高于农田土壤。森林及以禾本科为主的中生性草地下的土壤,表土有机貭中合有約20—35%的活性腐殖貭(为0.1 N NaOH所能提取),但是水稻土中,通常只占6%以下。这点說明了在热带和亚热带地区的生物气候条件下,一年2—3造的耕作制度,可使結构比較簡单的活性腐殖貭很快的被矿化,而土壤肥力的維持在很大程度上依賴于有机肥料和化学肥料的逐年补給。 2.土壤中胡敏酸与富里酸的比率华南自然植被下的土壤有机貭中,胡敏酸与富里酸的比率通常小于1,紅壤地区土壤中富里酸比胡敏酸高的特点,是由于富里酸能在酸性溶液中和活性R_2O_...
Several theoritical problem of the planation surface have been discussed and their significance in scientific research has been demonstrated in this paper.The author acknow ledges that a wearing surface is formed on the land mass during a period of structurally relative stability, under the advantageous climatic conditions(hot or warm and alternating dry and wet), and by denudation and planation, which have planed the geoteotonic surface through a long period. The author had already analized the exoge...