Hazus | Import a DAT File for a Hurricane Scenario


[ upbeat music ] [ sound effects ]
boom, whoosh, drip, splash, sparkle [ upbeat music fades in ] Welcome to the “Import a DAT File for a Hurricane Scenario” video tutorial. In this video, we will provide an overview
of DAT files and walk through how to import a DAT file of observed windfield data into
Hazus to create a hurricane scenario. What is a DAT file? It is a collection of observed wind speeds
captured at the census tract level for a real-world hurricane event, which allows users to build
scenarios based on that actual event. Using a DAT file allows users to import actual
windspeeds tied to a census tract rather than having Hazus model the windspeeds using a
storm track and its own calculations. Please note that these files are not generally
available for all hurricanes and require contacting the Hazus Team, via the email in the video
description, to see if one is available. For this walkthrough, we will be using a DAT
file provided from FEMA’s Natural Hazards Risk Assessment Program for 2017’s Hurricane
Harvey. It is important to note that you must use
a study region that contains an area impacted by the hurricane in order to create a scenario
from a DAT file. For example, we cannot use a study region
in North Carolina with a DAT file for a hurricane
in Texas. [ upbeat music ] For our scenario, we are going to import a
DAT file for 2017’s Hurricane Harvey. We have already opened a study region of Aransas and Nueces counties in Texas since that is an area that was impacted by that storm. To begin the process of importing the data,
open the “Hazard” menu and select “Scenario…”. This opens the Hurricane Scenario Management
Wizard, which will guide you through selecting the DAT file to create your hurricane scenario. Click “Next” to start the wizard. Here you select the type of Hurricane Scenario
you’d like to build. Since we are building a scenario from imported
data, we will select “Create New Scenario” and click “Next”. Select the type of data you will use to build
your new scenario. We will build a hurricane scenario from a
DAT file which is also known as an “Import Census Tract Data file”, formerly known as
H*Wind Import. Select that option and click “Next”. Now you are asked to name your scenario. We suggest you name your scenario something
descriptive and unique so you can easily identify it after you create it. Here we will name our scenario starting with
“HarveyDAT” and ending with today’s date so that we know the type of scenario and when
it was created. Once you name your scenario, click “Next”. You will need to locate your DAT file on your
hard drive. Click “Browse” and navigate to where you have
saved the file. Once it is selected, click “Next”. [ upbeat music ] Hazus will now import the file and a dialog
box will appear for you to review the scenario’s storm track data. However, since DAT files import windspeeds
at the census tract centroid, not the actual hurricane track data, this grid will be blank,
so just click “Next” to be taken to the final review of the whole scenario. If you would like to make any changes, click
“Back” and make those changes at this time, or click “Next” to proceed to the final step
of the scenario creation. Now Hazus will ask if you would like to make
this scenario active for analysis. We will select “Yes” and click “Next”. Click “Finish” and the scenario will become
active. Your DAT-based scenario is complete and ready
for use in loss analyses. However, it is recommended that you view the
windspeed data in order to confirm the import was successful and to familiarize yourself
with your scenario. You can view the imported data by opening
the “Results” menu and clicking “Wind Speeds”. A grid will appear with the windspeed data
for each census tract. Select the column header and click “Map”,
then return to the map view to see the data in your study region. Congratulations! In this video, you learned about DAT files and how to import a DAT file of observed windfield data into Hazus to create a hurricane scenario. Look for more Hazus video tutorials on the
FEMA YouTube channel. [ upbeat music fades out ]

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