You choose your year, then can choose a storm, and then a particular day. The National Hurricane Center’s GIS data page provides historical forecasts – the projected path and cone of storms, windspeeds, storm surges, etc. Areas in pink illustrate sea level 6 feet higher than present NOAA National Hurricane Centerīeyond showing the general impact of flooding or sea level rise, you can also look at the track of individual hurricanes and tropical storms. An example of 6 feet in sea level rise is shown below. The sea level rise data is package in an ArcGIS file geodatabase, with two sets of files (a low estimate and high estimate) in one foot increments. There are separate downloads for sea level rise, rise depth, the confidence intervals for the models, as well as DEMs and flood frequency. You can download the data by US state or territory for coastal areas. NOAA’s Sea Level Rise (SLR) viewer allows you to easily visualize the impact of sea level rise in 1 foot increments, between 1 and 10 feet. Instead of the impact of a one-shot event, this illustrates potential long term change. A different way of looking at flooding is to consider sea level rise due to climate change, where the impact of sea level rise is measured in different increments. The FEMA maps assess both past events and current conditions to model the likelihood of flooding in a 100 or 500 year period for a major storm event. These are county-level layers that indicate where disaster areas were declared and what kind of funding or assistance is / was available. FEMA Flood Hazard Layer, 100 year zones in dark blue, 500 year in light blueįEMA also has a GIS data feed for current and historical emergencies and disasters, that are available in a variety of formats both spatial and non-spatial. The pic below illustrates 100 and 500 year zones overlaid on the OpenTopoMap. They’re categorized into 100 and 500 year zones, open water bodies, areas outside of flood zones, and areas outside flood zones protected by levees. The data is packaged in an ArcGIS File Geodatabase, with one polygon feature class for flood zones. The links at the bottom include this one: Download Seamless Nationwide NFHL GIS data. If you want FEMA flood data in a GIS format: GO HERE! This is the record in for the National Flood Hazard Layer. I’ve searched through their main program site for the National Flood Hazard Layer and followed every link, but can’t for the life of me find the connection to the page that has actual GIS data there are map viewer tools, scanned paper maps, web mapping services, and everything else under the sun. The FEMA flood maps are usually the first thing that comes to mind when folks set out to find data on flooding, but good luck finding their GIS data. Once you hit the Add button, you’ll be prompted to choose the features in the DB that you wish to add to the project.Īdding a File Geodatabase in QGIS FEMA Flood Hazards and Disasters In the Source Type dropdown you can choose OpenFileGDB, and browse and select the database, which appears as a folder. If you’re a QGIS user, use the Data Manager and on the Vector tab change the source type from File to Directory. If you’re an ArcGIS user, use the Catalog pane to browse your file system and add a connection to the database / folder to access its contents. Once you’ve downloaded and unzipped one, it looks like a folder with lots of subfolders and files. Given the size of many of these datasets, the ArcGIS File Geodatabase is often used for packaging and distribution. Most of the projects I mention below are cataloged there. You can filter by place and data type there are even a few global sources. NOAA’s DigitalCoast is a good place to start it’s a catalog of federal, state, and US territory projects and websites that provide both spatial and non-spatial datasets related to coastal storms and flooding. There’s a ton of data available, particularly from NOAA, but there are so many projects and initiatives that it can be tough to find what you’re looking for. Over the course of this academic year I’ve helped many students find GIS data related to coastal storms and flooding in the US.
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