DMC_DEMO.R

To quantify sampling coverage, we developed a box-counting method, the Dynamic Match Coefficient (DMC), which quantifies how much a set of occurrences of a given species matches with its geographic range or climatic niche. DMC is the area under the curve measuring the match between occurrence data and background reference (geographic range or climatic niche) across grids with variable resolution. High DMC values indicate good sampling coverage.<br>Here we provide the R code for DMC calculation with an application example.Range.dbf contains xy coordinates of occurrences of a example species. Plots.dbf contains xy coordinates of vegetation plots where the given example species occurres in.

为量化采样覆盖度，我们开发了一种盒计数方法——动态匹配系数（Dynamic Match Coefficient，DMC），该方法可衡量某一给定物种的出现记录集合与其地理分布范围或气候生态位的匹配程度。DMC为可变分辨率网格下，出现数据与背景参考（地理分布范围或气候生态位）间匹配度曲线下的面积。DMC值越高，则代表采样覆盖度越好。<br>本数据集提供了用于DMC计算的R代码及应用示例。Range.dbf存储了示例物种出现记录的xy坐标；Plots.dbf存储了该示例物种分布的植被样地的xy坐标。