一、该数据数字化自图纸的《大沁他拉沙漠化发展程度图(1958)》，该图的具体信息如下：

主编:朱震达、邱醒民

编辑 :王一谋

制图:冯毓荪、姚发芬、吴薇、王建华、王周龙

制图单位:中国科学院沙漠研究室编制

出版社:西安地图出版社出版，统一书号：12461.26

比例尺:1：100000

二、数据均以ESRI Shapefile格式储存，包括以下图层：

沙漠化发展程度图（1974）：desertification1974.dbf、desertification1974.shp、desertification1974.shx、desertification1974.prj

双线河：River_double.dbf、River_double.shp、River_double.shx、River_double.prj

单线河：River_single.dbf、River_single.shp、River_single.shx、River_single.prj

道路：Road.dbf、Road.shp、Road.shx、Road.prj

湖泊：Lake.dbf、Lake.shp、Lake.shx、Lake.prj

街道：Stree.dbf、Stree.shp、Stree.shx、Stree.prj

铁路：Railway.dbf、Railway.shp、Railway.shx、Railway.prj

林带：Tree_networks.dbf、Tree_networks.shp、Tree_networks.shx、Tree_networks.prj

居民地：residential.dbf、residential.shp、residential.shx、residential.prj

图廓：map_margin.dbf、map_margin.shp、map_margin.shx、map_margin.prj

1、沙漠化发展程度图属性字段及编码属性:(1)沙化程度(Type)：半流动沙地(Semi-shifting Sandy Land),沙地形态类(Shapes),草地(Grassland),林地(Woodland) ,林地疏密度(W_density),耕地(Farmland)

(2)沙地形态类（Shapes):新月形沙丘(Barchan Dunes),平沙地(Flat Sandy Land),缓起伏沙地(Undulating Sandy Land),灌丛沙堆(Vegetated Dunes)

(3)草地(Grassland):草地(Grassland)

(4)林地(Woodland):灌木林(Woodland)

(5)林地疏密度(W_density):疏林地(Sparse Woodlot)

(6)耕地(Farmland):旱作农田及弃耕地(Dryfarming and Abandoned Farmland),灌溉农田(Irrigated Fields)

2、投影信息：

Angular Unit: Degree (0.017453292519943295)

Prime Meridian: Greenwich (0.000000000000000000)

Datum: D_Beijing_1954

Spheroid: Krasovsky_1940

Semimajor Axis: 6378245.000000000000000000

Semiminor Axis: 6356863.018773047300000000

Inverse Flattening: 298.300000000000010000