中国1:200万沙漠分布图(1974年)
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沙漠化是我国北方干旱、半干旱及部分半湿润地区由于人地关系不相协调所造成的以风沙活动为主要标志的土地退化。 数据源:中国冰川冻土沙漠研究所编绘,中国科学院地理研究所协作,根据七十年代航片,加上实地调研,绘制的1:200万沙漠图,图中中国国界是根据地图出版社一九七一年出版的1:400万《中华人民共和国地图》地图绘制。 一、数据集内容 1、Desert_Ch_2009(沙漠分布) 2、Dune_hight_Ch_200(沙丘高度) 3、Gobi_Ch_200(戈壁) 4、Wind_eroded_land_Ch_200(风蚀地数据) 二、沙漠化属性表字段如下: (1)Semifixed(半固定沙丘):缓起伏沙地(2-1)、灌丛沙丘(2-2)、抛物线状沙丘(2-3)、梁窝状沙丘(2-4)、沙垄及树枝状沙垄(2-5)、蜂窝状沙丘(2-6)、蜂窝状沙垄(2-7)、复合型沙垄(2-8) (2)Fixation(固定沙丘):平沙地(3-1)、草原丛沙堆(3-2)、沙垄(3-3)、蜂窝状沙丘(3-4) (3)Migratory(流动沙丘):新月形沙丘及沙丘链(1-1)、新月形沙垄及沙垄(1-2)、格状沙丘及格状沙丘链(1-3)、鱼鳞状沙丘(1-4)、羽毛状沙垄(1-5)、金字塔沙丘(1-6)、复合型沙丘及沙丘链(1-7)、复合型沙垄(1-8)、复合型穹状沙丘(1-9)、链状沙山(沙丘)(1-10)、迭置型链状沙山(1-11)、复合型垄状沙山(1-12)、复合型链状沙山(1-13)、金字塔形沙山(1-14) (4)class_id:沙化属性编码
Desertification refers to land degradation characterized primarily by wind-sand activities, which occurs in arid, semi-arid and some semi-humid regions of northern China due to the imbalance between human activities and the natural environment. Data Source: Compiled and drawn by the Research Institute of Glaciers, Frozen Soil and Desert, Chinese Academy of Sciences, with collaboration from the Institute of Geography, Chinese Academy of Sciences. The 1:2,000,000 scale desert map was developed based on aerial photographs from the 1970s and field surveys. The national boundary of China on this map was drawn according to the 1:4,000,000 scale *Map of the People's Republic of China* published by the Cartographic Publishing House in 1971. Dataset Contents 1. Desert_Ch_2009 (Desert Distribution) 2. Dune_hight_Ch_200 (Dune Height) 3. Gobi_Ch_200 (Gobi) 4. Wind_eroded_land_Ch_200 (Wind-eroded Land Dataset) Desertification Attribute Table Fields (1) Semifixed Dunes: - Gently undulating sandy land (2-1) - Shrub dunes (2-2) - Parabolic dunes (2-3) - Trough-shaped dunes (2-4) - Sand ridges and dendritic sand ridges (2-5) - Honeycomb dunes (2-6) - Honeycomb sand ridges (2-7) - Compound sand ridges (2-8) (2) Fixed Dunes: - Flat sandy land (3-1) - Grassland nabkhas (3-2) - Sand ridges (3-3) - Honeycomb dunes (3-4) (3) Migratory Dunes: - Barchans and dune chains (1-1) - Barchan sand ridges and sand ridges (1-2) - Grid dunes and grid dune chains (1-3) - Fish-scale dunes (1-4) - Feather-shaped sand ridges (1-5) - Pyramidal dunes (1-6) - Compound dunes and dune chains (1-7) - Compound sand ridges (1-8) - Compound dome-shaped dunes (1-9) - Chain-shaped sand mountains (dunes) (1-10) - Superimposed chain-shaped sand mountains (1-11) - Compound ridge-shaped sand mountains (1-12) - Compound chain-shaped sand mountains (1-13) - Pyramidal sand mountains (1-14) (4) class_id: Desertification Attribute Code




