Basic data — Technical Paper — Orography

In this layer are included the theme of theltimetry with the description of level curves and quoted points, the theme of batimetry with the description of the batymetric curves and the batimetric points (bottoms), the theme of the natural forms of the soil, that is to say those auxiliary elements of reading the morphology of the territory and the theme of digital models of the terrain.

本图层包含以下四类主题：其一为高程测量（altimetry）主题，包含等值线（level curves）与标注测点（quoted points）的相关描述；其二为测深学（batimetry）主题，包含等深线与水深测点（水底点）的相关描述；其三为土壤自然形态主题，即辅助解译区域地貌的各类辅助要素；其四为地形数字模型主题。