Elevation Data for Floodplain Mapping (2007) / Chapter Skim
Currently Skimming:
6 Conclusions and Recommendations
6 Conclusions and Recommendations
Pages 115-120
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From page 115... ...
Identify the current mapping technologies being used by the Federal Emergency Management Agency (FEMA) to develop flood hazard maps; 2.
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From page 116... ...
Some communities and a few states, most notably North Carolina, have undertaken elevation mapping programs that provide data of the required accuracy to meet floodplain mapping standards. Where locally or regionally collected high-accuracy elevation data are unavailable, floodplain studies rely on data from the U.S.
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From page 117... ...
. Some information about the land surface elevation is routinely obtained during the orthophoto production process but is not sufficient to create a high-quality digital elevation model.
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From page 118... ...
Indeed, the Shuttle Radar Topography Mission (SRTM) , operated by the National Aeronautics and Space Administration in 2000, resulted in a significantly improved map of global topography.
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From page 119... ...
For example, in 2007, the Florida Division of Emergency Management will be acquiring lidar data satisfying 1-foot equivalent contour accuracy of shorelines for storm surge modeling and hurricane evacuation planning. As part of Elevation for the Nation, federal, state, and local mapping part ners should have the option to request data that exceed minimum specifications if they pay the additional cost of data collection and processing required to achieve higher accuracies.
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From page 120... ...
The committee suggests, for example, that analysis of a selection of updated flood maps could be useful to compare the quantitative effects of using lidar versus using conventional 10-meter or 30-meter NED information derived from USGS topographic maps to provide the elevation data. In a new, two-year study, beginning in early 2007, FEMA has separately requested the National Academies to undertake a distinct evaluation of flood map accuracy, including an examination of the whole range of uncertainty in flood mapping arising from uncertainty in flood hydrology and hydraulic modeling, as well as uncertainty in land surface elevation.
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