ATKIS DTK 1:25 000 - Timeliness

The topographic content of the Digital Topographic Map 1: 25 000 (DTK25) are created by presenting the data of the basic DLM. For information on the topicality of this presentation, four points in time are specified: With regard to the selected area, they shall indicate the following information by letter: B = date of flight for the basic update of the basic DLM; T= date of the basic topographic update of the base DLM; S= Topographic update date of the base DLM; R= Date of creation of raster data1:25000数字地形图（Digital Topographic Map 1:25 000，DTK25）的地形要素数据，依托基础DLM（basic DLM）数据生成。为明确本成果的现势性信息，共设定四个时间节点，针对所选区域，各字母分别代表如下含义：B = 基础DLM基础更新的航摄日期；T = 基础DLM的基础地形更新日期；S = 基础DLM的地形更新日期；R = 栅格数据生成日期。