求翻译：有几种方法创建栅格数据库。一个个单元直接输入图层是最简单的。多栅格数据作为图像的数字形式而准备好的。遥感以数字形式生成图像。栅格中的值的类型取决于显示的编码和GIS。每个像素和单元被假设只能有一个值是什么意思？

There are several ways to create a raster database. A unit directly input layer is the simplest. Multi-grid data as the image in digital form ready. Remote sensing image is generated in digital form. The type of value in the grid depends on the coding and gis. Each pixel and the unit is assumed to h

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There are several ways to create a grid database. Unit directly into the layers one by one are the most simple. Raster data as ready in the form of digital images. Remote sensing generated images in digital form. Type values in the grid depends on the encoding and display GIS. And each pixel cell is

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