Integrated Terrain Unit map (ITUM) with several overlays of land elements is being developed in the world. The ITUM is a new computer mapping system.
具有几个土地要素层的综合土地单元制图在土地研究中正在获得日益广泛的应用，它是计算机制图的基础。
Integrated Terrain Unit map (ITUM) with several overlays of land elements is being developed in the world. The ITUM is a new computer mapping system.
具有几个土地要素层的综合土地单元制图在土地研究中正在获得日益广泛的应用，它是计算机制图的基础。
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