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map scale 地圖比例尺。

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Experiment results show : ? he theory and method of information content could play an important role in the case study on the accuracy and application of dem . ( 2 ) in the loess plateau area , there are much difference between 5m resolution dems of 1 : 10000 map scale and 25m resolution dems of 1 : 50000 map scale while gathering terrain characteristic information , and yet the spatial structure of dem error have discipline and measurability on statistics . ( ? the results could offer fundamentals and methods to people on their work to research the terrain information content of dems with different scale level 研究結果顯示: 1 、地形信息容量的理論與方法對于dem精度與應用適宜性的研究具有重要的作用; 2 、在黃土丘陵溝壑區,同1 : 1萬比例尺5米分辨率的dem相比, 1 : 5萬比例尺25米分辨率dem在提取地形特征方面具有較大的差異,但誤差的量值與空間分布具有統計上的規律性與可估算性; 3 、以上研究結果可望為其它各級比例尺dem地形信息容量的研究提供新的理論基礎與技術方法,也可為有關規范、標準的制定提供依據。

The basic concept of terrain information content is proposed after an overall review of existing research achievement . applying a series of analysis and data processing method , like math - analysis , mathematical statistics , comparative , error visualizing , this paper carefully investigated the terrain information content characteristic of dems of 1 : 50000 map scale of loess plateau area 本文在對前人已有研究成果進行系統總結的基礎上,首先明確了dem地形信息容量的基本概念,并運用數學分析、數理統計、比較分析、誤差地圖等方法,以海拔高程與等高線為研究對象,以1 : 1萬比例尺dem為參考真值,探討了黃土丘陵溝壑區1 : 5萬dem的地形信息容量特征。

The methods for solving these problems are put forword as follows : the method of airphoto scale rangs from 1 / 4 to 1 / 6 of map scale ; a flight line uses belt method ; the optional time intervals of airphoto taking are from may to june and from august to october in one year ; when the contrast at the site is small , or the visibility is rather low and needs to enchance the contrast , the hardening agent should be prepared to process the film 并提出了解決問題的方法:山區航空攝影合理的攝影比例尺應是成圖比例尺的1 / 4 ~ 1 / 6 ;對于山區窄而長,且為線狀走勢的河流宜采用帶狀航線設計方法設計;山區流域水分充足能見度不好,惟每年5 - 6月和8 - 10月是航空攝影的最佳季節;當地面物體反差小或能見度不好而需要特別提高反差時應配制較硬性藥水沖洗等。

In this paper , we apply the theory of “ nature objects existed being excellent and washed out being of feebleness “ to automated map generalization basing on thinking of the conditions of map use , characters of map regions and map scale . two generalization models which are called “ constrained delaunay triangle net generalization model ( cdtngm ) “ and “ circle generalization model ( cgm ) “ are created 本文在考慮了地圖用途、制圖區域地理特點和地圖比例尺等因素的基礎上,把“優勝劣汰”的思想運用到了地圖自動綜合中來,并實現了“約束delaunay三角網綜合模型”和“ circle綜合模型”兩個算法模型。

The main subjects of this paper are as follows : ( 1 ) the conditions of map use , characters of map regions and map scale are considered during map generalization . we also build several tools to dynamic sum up and pack up generalization rules and parameters and put them to generalization knowledge library 考慮了影響制圖綜合的三要素,即地圖用途、制圖區域地理特點和地圖比例尺,并實現了對綜合規則、參數的歸納和整理,建成了可動態擴展的規則庫和參數庫。

Based on the theory of the extended fractal dimension , this paper studied the attenuation level of self - similarity of various map objects with the variety of the map scale , and researched further the relationship between the scale level factor of map features and fractal attenuation 以擴展分維作為理論基礎,從變維分析的角度出發,研究地圖目標的自相似程度隨比例尺變化而衰減的規律,進一步研究地圖目標的尺度指標與分形衰減之間的關系。

The major considerations in proposing this scheme include the purpose of the classification , mapping scale , source of data , technological approach in producing the landuse plan , size of the study area and compatibility with previous work and national landuse standards 提出這一方案時考慮了多種因素,包括分類目的、繪圖比例尺、資料來源、繪制土地利用圖的技術途徑、研究范圍規模、以及與以前工作成果和國家標準的相容性。

Inferring from the corresponding map scale , the total area of the three ringed mountains are about 1000 square kilometers , the average area of each ringed mountain is similar to 327 . 5 square kilometers , the total area of shenzhen special economic zone 根據有關地圖比例尺推算,三個環形山的總面積約1000平方公里,每個環形山平均占地面積與深圳經濟特區(一線)總面積327 . 5平方公里較接近。

Given the consideration of mapping scale and availability of spatial attribute data , the methodology for the production of lut and lup will focus on utilisation of space - borne remote sensing technology 在考慮制圖比例尺和可獲取的空間及屬性資料的前提下,制訂土地利用表和繪制土地利用圖的方法著重于航天遙感技術的應用。

To zoom in and out , press , or press then drag . map scale ranges from 1 : 2 , 000 to 1 : 550 , 000 按下,或按下后拉動可隨意放大或縮小地圖,地圖比例由1比2 , 000至: 550 , 000 。