Because of their advantages such as small data size, high precision, lossless scaling and easiness to manipulate, vector digital maps are the most important resources in GIS.
其中矢量形式的数字地图由于具有数据量小，精度高，可以无损缩放，便于进行各种操作等优点，是GIS中最重要的资源。
But most algorithms are memory resident, typically assuming a small data size.
大部分算法是内存驻留算法，适用于小型数据集。
Panorama is a very useful image-based rendering technique, because of its small data size to represent virtual scenes, and high rendering speed.
全景图是基于图像绘制技术最实用的技术之一，因为它在表示虚拟场景时数据量不大，绘制速度较高。
Panorama is a very useful image-based rendering technique, because of its small data size to represent virtual scenes, and high rendering speed.
全景图是基于图像绘制技术最实用的技术之一，因为它在表示虚拟场景时数据量不大，绘制速度较高。
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