kernelDensity http://3dgis.supermap.jp/iserver/services/spatialAnalysis-PortGeoDB/restjsr/spatialanalyst/datasets/%E5%B2%A9%E7%9B%A4%E3%83%9C%E3%83%BC%E3%83%AA%E3%83%B3%E3%82%B0@%E3%83%9C%E3%83%BC%E3%83%AA%E3%83%B3%E3%82%B0/densityanalyst/kernel