IFSAR Digital Surface Model (DSM)

In 2011 the Alaska Congressional Delegation requested federal support in modernizing Alaska map data. Collection of a 5-meter resolution elevation grid for Alaska began in 2012, replacing the former 60-meter statewide elevation grid. Radar technology called IfSAR (Interferometric Synthetic Aperture Radar) is used to collect the data because it can penetrate the clouds, smoke and haze that are often present in Alaska. The data are free to the public for any use. Alaska IfSAR acquisition supports the broader national 3D Elevation Program.2011年，阿拉斯加国会代表团请求联邦政府支持阿拉斯加地图数据的现代化改造工作。2012年，阿拉斯加5米分辨率高程栅格的采集工作正式启动，以替代此前沿用的60米全州高程栅格。本次数据采集采用了名为干涉合成孔径雷达（Interferometric Synthetic Aperture Radar，简称IfSAR）的雷达技术，该技术可穿透阿拉斯加地区常见的云层、烟雾与雾霾，适配当地复杂气象条件完成数据采集。该数据面向公众免费开放，可用于任何用途。阿拉斯加IfSAR数据采集项目为更广泛的全国三维高程计划提供了有力支撑。