In traditional cameras the focal plane was a piece of film; modern ones use arrays of digital sensors.
在传统相机上以胶卷作为焦平面；现代相机使用数字传感器列阵的方式。
An image with intersection lines between grating planes and a known objective plane can be captured by a digital camera.
将光栅投影到已知目标平面，通过数字摄影得到光栅平面与目标平面相交的光栅图像。
DEM (Digital elevation Model) is a data set of plane coordinate or longitude, latitude, and elevation of the regular square grid points in some region.
数字高程模型(DEM)是一定区域范围内规则格网点的平面坐标及其高程的数据集或者是经、纬度和海拔高度的数据集。
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