Inspire Elevation Vector

The Elevation of a terrain surface whether land based or Bathymetric in nature described the Earth’s morphology The Elevation data theme includes digital elevation models for land ice and ocean surfaces for both terrestrial elevation and Bathymetry as well as shorelines The main purpose of a Digital Elevation Model is to provide an elevation property with reference to a specified origin vertical reference or datum This property may be height when the value is measured opposite to the gravity field of the Earth or depth when the value is measured in the direction of the gravity field In line with existing technologies three spatial representation methods have been provided grid vector and triangulated irregular network TIN Regarding provision of data grid spatial representation type is mandatory for the description of land elevation whereas the other ones are optionally either finally the grid or the vector spatial representation type is mandatory for the provision of data describing the Bathymetry whereas the other ones are optionally either the grid or the vector spatial representation type is mandatory for the provision of data describing the Bathymetry无论是陆基还是水深测量（Bathymetry）性质的地形表面高程，均表征了地球的地貌形态。高程数据主题涵盖了用于陆地冰与海洋表面的数字高程模型（Digital Elevation Model），覆盖陆地高程与水深测绘相关内容，同时包含海岸线数据。 数字高程模型的核心用途在于提供基于指定基准原点、垂直参考系或大地基准的高程属性。该属性可表现为两种形式：当测量方向与地球重力场方向相反时，该值为海拔高度；当测量方向沿地球重力场方向时，该值为水深。结合现有技术规范，共提供三种空间表达方法：格网（grid）、矢量（vector）与不规则三角网（Triangulated Irregular Network, TIN）。在陆地高程数据的提供中，格网空间表达类型为强制性要求，其余两种为可选类型；而在水深测绘相关数据的提供中，格网或矢量空间表达类型为强制性要求，其余类型为可选。