City METROPOLITANA MILAN – isopieze I falda March 2009

Isopieze I groundwater of March 2009 (quota s.l.m. – isoline step 5 m) obtained from processing in GIS environment of punctual piezometric data of the Environmental Information System. The Province of Milan has periodically drawn up a cartography of piezometries and surface aquifers according to representative methodology adopted since 2005. Technical data: Work scale: 1:10.000 Coordinate system: Gauss-Boaga (Westcast) – Gauss compliant transverse cylindrical projection – reference Ellissoid: international ellipsoid of Hayford – Rome '40. Type of vector data (shapefile): Polyline Geographical coverage: Administrative area of the Province of Milan (North-West X: 1.477.012 Y: 5.065.677 South – East X: 1.543.096 Y: 5.001.013)本数据集为2009年3月的等水压线Ⅰ型地下水数据（海拔高程以平均海平面为基准，等值线间距5米），数据源自环境信息系统的点位测压水位数据在地理信息系统（Geographic Information System, GIS）环境中处理得到。米兰省自2005年起采用既定标准方法，定期编制测压水位与浅层含水层专题制图。 技术参数： 作业比例尺：1:10000 坐标系：高斯-博加（西带）——符合高斯投影的横圆柱投影——参考椭球体：海福德国际椭球体——罗马1940坐标系（Rome '40） 矢量数据（Shapefile）类型：折线（Polyline） 地理覆盖范围：米兰省行政辖区（西北坐标：X=1477012，Y=5065677；东南坐标：X=1543096，Y=5001013）