地面坡度是最重要的地形定量指标，建立科学合理的地面坡度分级体系是对坡度进行科学研究与坡度图制图必不可少的重要环节。
Slope is the most important topographic variables. It is a critical work to establish a scientific and reasonable slope classification systems for terrain research and slope mapping.
地面坡度是最重要的地形定量指标，建立科学合理的地面坡度分级体系是对坡度进行科学研究与坡度图制图必不可少的重要环节。
Slope is the most important topographic variables. It is a critical work to establish a scientific and reasonable slope classification systems for terrain research and slope mapping.
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