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沙漠化专题图必须包括沙漠化土地现状、成因类型、沙漠化土地区划及沙漠化演变趋势的预测等内容。为此必须收集不同时期的航空相片、地形图、文字资料和统计资料作为编图的基础。在航片判读过程中,必须先为各项主要内容建立判读标志。沙漠化专题图的表示方法可以采用质底法、区域法和分区统计图表法等配合使用,使各类专题内容多层次地表示在地图上。根据内容的主次,可以分别采用不同色相、不同饱和度的颜色;不同形状的符号;不同粗细的线条互相组合叠置,使沙漠化地图的内容丰富而清晰,分布规律明显;图面色彩鲜艳而柔和,层次分明。在资料丰富,沙漠化专题内容研究较深入的情况下,采用系列图的形式更为理想。
Thematic map of desertification must include the status of desertified land, the type of genetic cause, the regionalization of desertified land and the prediction of the evolution trend of desertification. To this end, aviation photographs, topographic maps, written materials and statistical data of different periods must be collected as the basis of the compilation. In the course of interpretation of aerial photographs, we must first establish a reading mark for each major content. The representation of the desertification thematic map can be used in conjunction with the bottom-of-law method, the regional method and the zonal statistical chart method to make the various types of thematic content multi-levelly represented on the map. According to the content of the primary and secondary, you can use different hues, different saturation colors; different shapes of symbols; different thickness of the lines stacked with each other, so that desertification map content rich and clear, the distribution of obvious; colorful and Soft, structured. In the case of rich information and desertification research, the series of diagrams is more ideal.