基于DEM的遗址域定量算法及可获取耕地统计

DEM based Quantitative Site Catchment Definition and Statistics on Retrievable Farmlands

西方学者提出的"遗址域"概念架起了从遗址内物质遗存分析到遗址外自然环境分析的桥梁。遗址域界定是后期自然环境分析的重要前提,引起了国内学者的广泛关注,但目前的工作尚未提出定量方法来计算不同地貌环境下的遗址域。以高分辨率DEM和相关学者总结的4种步行速度函数为基础,利用ArcGIS的成本距离工具和栅格计算功能生成了地形因素影响下的2h步行遗址域,并进一步讨论了4种算法的数值分布特征。其中较为合理的算法被应用于官亭盆地的3个典型遗址,以统计不同地貌单元的遗址在步行范围内的宜耕土地供给状况。最后,对遗址域分析的现存问题和未来发展,提出了认识和展望。

The concept of＂Site Catchment＂proposed by western scholars bridges the＂on-site＂relic analysis and＂off-site＂natural environment analysis.Arousing common concerns in Chinese archaeologists,the scope definition of site catchment is a vital premise of post natural environment analysis.However,current works have not adopted quantitative method to define the scope of site catchment affected by topographic fluctuation.Based on high resolution DEM and four walking speed functions raised by former researchers,the four catchment scopes are generated through cost distance tool and raster calculation function of ArcGIS.The value distribution of four algorithms is discussed as well.The comparatively reasonable method is applied to the three sites with distinct topographic environment in Guanting basin to indicate the availability of farmable flat lands within pedestrian area.New understandings of existing problems and foresights for ongoing progress of site catchment analysis are proposed in the end.