FEMA FLOOD MAPS (GIS)
An erroneous flood classification, based on FEMA flood maps, resulted in undue flood insurance expenses for residents of the Village of Wellington. Looking to mitigate these expenses, the Village requested certified elevation data to enhance the accuracy of the FEMA flood maps within the Village limits.
WGI’s aerial LiDAR was used to acquire elevation data throughout the project area. Control for the project was established using static GPS methods, including precise elevation determination in accordance with National Geodetic Survey guidelines. Two hundred ground classification elevation positions were also collected using conventional survey methods, and more than 300 geo-referenced ground cover photos were obtained.
The final deliverables included a certified FEMA-classified LiDAR dataset for the study area, including FEMA ground cover classifications. Index contours were developed from the LiDAR dataset and delivered in AutoCAD and ArcGIS formats. FEMA-compliant GIS metadata was also developed and submitted to the Village.