Present and past presence of Santolina ligustica

The data frame reports the presence of Santolina ligustica. Distribution is reported as presence in a grid at 0.0003825773 x 0.000266708 degrees centigrade of resolution (extent: 9.480258, 9.637115, 44.15192, 44.26713; crs: +proj=longlat +datum=WGS84 +no_defs). The column "x" and "y" reported the centroids of the cells where specie occur. The column "Distribution_1999" shows the presence of the species as reported in Torricelli et al. 1999. In the file "Distribution_2021.tif" is reported the presence of the species detected by the authors during field surveys carried out in 2020 and 2021.本数据框记录了利古里亚棉杉菊（Santolina ligustica）的分布出现情况。该数据集以空间分辨率为0.0003825773×0.000266708十进制度的网格记录物种分布，研究区域范围为9.480258至9.637115（经度）、44.15192至44.26713（纬度），坐标系为+proj=longlat +datum=WGS84 +no_defs。其中，x、y列记录了物种出现单元格的质心坐标；Distribution_1999列展示了Torricelli等（1999）报道的该物种分布出现记录；文件"Distribution_2021.tif"则收录了作者于2020年与2021年开展野外调查时所监测到的该物种分布出现情况。