kernelDensity http://3dgis.supermap.jp/iserver/services/spatialAnalysis-PortGeoDB/restjsr/spatialanalyst/datasets/PL%E5%88%A4%E5%AE%9A%E7%B5%90%E6%9E%9C@H24%E6%B6%B2%E7%8A%B6%E5%8C%96%E4%BA%88%E6%B8%AC%E5%9B%B3/densityanalyst/kernel