MN GIS/LIS NEWS
Spring 2009
ISSUE 56

MN GIS/LIS NEWS
The Newsletter of the Minnesota GIS/LIS Consortium

Table of Contents

MN GIS/LIS Consortium

From the Chair
Conference Planning
Volunteer Opportunities
Scholarship Winners

State
Drive to Excellence Update
USNG in Minnesota
Mn/DOT GIS Portal
LCC-GIS and Redistricting

Governor's Council
CTU and USNG standards out for review
Next Generation 9-1-1
GIS at RNC

Regional
Services Forum Results
Address Point Synchronization

Local
Tracking Utility Trucks
Watershed E. coli Study

Federal
Mapping Floods
Improvng Flood Maps
Height Modernization

Non-Profits
URISA Skills Survey
MHS Map Exhibit

People
Randy Johnson, ESRI GIS Hero

Other Places
Web 2.0 for Local Government
Economics and Place

 

 

Improving Flood Map Accuracy
From National Academies Press
 
A new report from the National Academies Press, Mapping the Zone: Improving Flood Map Accuracy, examines the factors that affect flood map accuracy, assesses the benefits and costs of more accurate flood maps, and recommends ways to improve flood mapping, communication, and management of flood-related data.
 
Federal Emergency Management Agency (FEMA) Flood Insurance Rate Maps portray the height and extent to which flooding is expected to occur, and they form the basis for setting flood insurance premiums and regulating development in the floodplain. As such, they are an important tool for individuals, businesses, communities, and government agencies to understand and deal with flood hazard and flood risk. Improving map accuracy is therefore not an academic question--better maps help everyone.
 
Making and maintaining an accurate flood map is neither simple nor inexpensive. Even after an investment of more than $1 billion to take flood maps into the digital world, only 21 percent of the population has maps that meet or exceed national flood hazard data quality thresholds. Even when floodplains are mapped with high accuracy, land development and natural changes to the landscape or hydrologic systems create the need for continuous map maintenance and updates.
 
The report, currently a pre-publication version, was authored by the Committee on FEMA Flood Maps; Board on Earth Sciences and Resources/Mapping Science Committee; National Research Council.
 
See the National Academies Press website to read the report online or to order a printed copy.
 
 

Data quality standards projected to be achieved for individual counties by the end of the Map Modernization Program. Green counties meet or exceed national flood hazard data quality thresholds. Yellow counties meet some standards. In red counties, the maps have been updated digitally.