See the link to the GDAL raster format information page in Resources for more information on other raster data formats.
见参考资料中gdal光栅格式信息页，了解更多关于其他光栅数据格式的信息。
Digital raster graphic(DRG) and digital line graphic(DLG) are two digital maps that can be taken cheaply, and DLG is a commonest data format now, it is the main data source of GIS.
数字栅格图和数字线划图是可以低成本获取的两种数字地图，而DLG是目前最普遍的矢量数据格式，是GIS的主要数据来源。
It includes some basic points such as scanning precision, format description of scanned data, conversion from the scanned data to generalized raster data, geometric correction and photograph merging.
阐述了扫描精度、扫描数据格式说明、转换成通用的栅格数据方法、几何纠正、像片拼接等基本问题。
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