Relief (Points). BTA 1:10000 of the year 2011

The phenomena grouped under this topic are included in the topic Elevation in the INSPIRE Directive covering digital altitude models of the land, ice and sea surface. Altitude is represented by level curves, heights at significant points and breaking lines. Level curves, with the exception of intercalary curves, are continuous. The equidistance between contour lines is 5 m, with master contour lines labelled every 25 m. The seabed can be represented by contour lines and elevation points or by bathymetry, i.e. bathymetric curves and sonar points, in which case the origin of depths must be indicated.本主题涵盖的相关现象归入《欧洲共同体空间信息基础设施指令》（INSPIRE Directive）中“高程”主题的范畴内，该范畴涵盖陆地、冰面与海面的数字海拔模型（digital altitude models）。高程可通过等高线（level curves）、特征点高程以及地形断裂线（breaking lines）进行表达。除间曲线（intercalary curves）外，所有等高线均为连续线条。等高线的间距为5米，每25米会标注一条计曲线（master contour lines）。海底地形可通过等高线与高程点表达，也可通过水深测量（bathymetry）实现，即采用等深线（bathymetric curves）与声纳测点（sonar points），此种情况下必须标注水深起算基准面的位置。