Probabilistic 100-year floodplain maps for data-scarce regions

The 100-year floodplain maps generated by Flood Emergency Management Agency (FEMA) are not available for many watersheds in the United States (Data-scare regions). A collection of probabilistic 100-year floodplain maps for 17 watersheds (HUC12) in these data-scare regions is presented here. These maps are the results of a new geomorphic model which uses open source data, such as DEM, climate and temperature rasters (Jafarzadegan et al., 2018). The floodplain maps are raster files in TIFF format with spatial resolution of 30 meters. The geographic and projected coordinate system used for these maps are GCS North American 1983 and NAD 1983 UTM respectively. The value of each cell ranges between 0-1 which presents the probability of getting inundated by a 100-year flood event. The maps are available from the following HUC units: 150602030605, 110200020704, 140500050108, 031102010505, 051401040706, 030501060305, 140600080205, 020802040501, 170200160505, 140401040110, 101401021103, 170602080412, 170900050604, 180400080803, 101302010107, 101302010108, 170200160408.

由洪水应急管理署（FEMA）生成的百年一遇洪水泛滥平原地图在美国众多流域（数据稀缺区域）中尚不可得。本处展示的是数据稀缺区域17个流域（HUC12）的百年一遇洪水泛滥平原的概率地图集。这些地图系新近的形态学模型所产出，该模型采用开源数据，如数字高程模型（DEM）、气候和温度栅格数据（Jafarzadegan 等，2018年）。洪水泛滥平原地图为TIFF格式的栅格文件，空间分辨率为30米。地图采用的地理坐标系统和投影坐标系统分别为1983年北美洲地理坐标系统（GCS North American 1983）和1983年北美洲大地测量通用横轴墨卡托坐标系（NAD 1983 UTM）。每个栅格单元的值介于0-1之间，表示百年一遇洪水事件发生时的淹没概率。地图可通过以下HUC单位获取：150602030605、110200020704、140500050108、031102010505、051401040706、030501060305、140600080205、020802040501、170200160505、140401040110、101401021103、170602080412、170900050604、180400080803、101302010107、101302010108、170200160408。