kernelDensity http://3dgis.supermap.jp/iserver/services/spatialAnalysis-PortGeoDB/restjsr/spatialanalyst/datasets/%E6%96%AD%E9%9D%A2%E7%B7%9A@%E3%83%9C%E3%83%BC%E3%83%AA%E3%83%B3%E3%82%B0/densityanalyst/kernel