Checking geometry and the congruency of raster, by means of an electronically generated grid, if necessary.

检查几何形状和光栅的一致性，如果有必要用电子生成网格的装置。

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First, the basic principles of geometry rectification of digital aerial images and raster relief map are introduced and thus the accuracy of geometry rectification is improved.

首先，重点阐述了数字航空影像几何纠正，以及栅格地图变形纠正的基本原理，进一步提高了几何纠正的精度。

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