Transcript Delft-FIAT trainingx

Delft-FIAT
IMPACT ASSESSMENT WITH FIAT
Flood Impact Assessment Tool (Delft-FIAT):
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Flexible framework for building unit-loss models
Calculation of damage at various scales and levels of detail
Applicable for both local floods and large-scale floods
Easy to build an interface on top or add to model train.
Able to deal with very large high resolution files.
Raster based
EXCEL CONFIGURATION FILE
Indicate:
• Location of files,
• Names of damage categories
• Maximum damages
EXPOSURE
EXPOSURE FILES
• Raster: ASCII (easier) or GeoTIFF (more efficient)
• One raster per damage category
• Each cell holds a value indicating the quantity of objects in that cell, this
needs to correspond with maximum damage.
• E.g. if maximum damage per m2 house -> cell holds m2 house
• Extend, cell size and projection needs to match for all exposure rasters.
CHOICE OF PIXEL SIZE
Too small pixel size (e.g. 1m)
• Slows down calculation
• Requires more hard drive space
Too large pixel size (e.g. 100m)
• Only part of pixel floods (buildings on highest points), yet average
pixel depth used for complete pixel.
• No problem with large flood depths, flat areas or low probability
events.
For Colombo we use a pixel size of 5m
Example of a pixel that is too large
1 pixel
PRE-PROCESSING FROM BUILDING POLYGON
For m2 building footprint
1. Select all buildings within
damage category.
2. Export to new shapefile
3. Convert to 1x1m raster with
value 1 in each cell.
4. Aggregate to desired
resolution
For number of buildings
1. Select all buildings within
damage category.
2. Convert polygon to point
3. Convert point to point data to
raster with in each cell the
point count.
MAXIMUM DAMAGE
• Input unit = Output unit
• Make sure all categories have the unit
DAMAGE FUNCTIONS
DAMAGE FUNCTIONS FORMAT
• CSV files
• File needs number as name, reference to number
from excel configuration.
• Place all files in same folder
• Does not interpolate => Needs input for each cm.
• Easy to create in excel (save as csv) or with script
WATER DEPTH MAP
RISK CALCULATION
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Delft-FIAT can calculate the annual expected damage also.
In the process you also get results for all different return periods.
You do this by changing the water depth input into a csv input.
The csv input holds the locations of all floodmaps with the return periods.
OTHER CONFIGURATION
1: name result file
2: Category included (1) or not
included (0)
3: Output individual layer map
4: Weight to scale output
5: Output maps
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RESULTS – FOR ONE WATER DEPTH MAP
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1= Column with category names
2= Damage per category (currency is
same as input currency)
3= Count of exposure input unit
4= Input unit exposure
• Also an excel version (without
styling) available
RESULTS – FOR RISK CALCULATION
• Each individual input water depth
map will get its own standard folder.
• A map will be made for each
damage category (needs to be
summed for EAD map)
• The EAD value is recorded in
special report per damage category
• Total EAD is also mentioned
• Unit of EAD is per year and
currency is same as input currency.
RESULTS – MAPS
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Delft-FIAT output also consists of maps in the tiff format.
These can be opened in ArcMap or QGIS by dragging them in.
User is required to set legend and choose a background
The following maps are available:
• Total damage
• Damage map per damage category – optional
• Risk map per risk damage category (when doing risk calculation)
HOW TO INSTALL AND RUN
Advanced
Executable
Install
1.Copy folder “advanced”
2.Go to folder “PythonInstall”
3.Install “.exe”
1.Copy folder “x64”
Run
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1. Set excel configuration
2.Open “run.bat” in text
editor (right click->edit or
open width)
3.Change file locations
4.Save and close “run.bat”
5.Double click “run.bat”
Set excel configuration
Open newly installed spyder editor.
Within spyder open “cla.py”
Within “cla.py” set location excel
configuration and location
“PythonFiles”
5. Save “cla.py”
6. Find install location Python, double
click “python.exe”
7. Type: execfile({{path cla.py}})
To get file path of any file: hold shift – right click – copy as path
Alternative run with macro buttons
RUN: EXECUTABLE
1=Location Delft-FIAT.exe (in x64 folder)
2=Location excel configuration
• If space in folder name add quote signs (e.g. “C:\my folder”)
• You can add multiple lines with different excel configuration files to run
them all at once (make sure to change the result folder for each run in
the excel configuration).
RUN: ADVANCED RUN (1)
1=save
2=location “PythonFiles” folder (you
can find this within advanced)
3=location excel configuration file
To do multiple runs at once:
• Repeat line 8,11,13 for each run.
• Make sure to change the result
folder for each run in the excel
configuration.
• If you know how, use for loop
• Advanced method:
• Use same excel
configuration file
• Change water depth and
More information:
result folder from Python.
https://publicwiki.deltares.nl/display/DFIAT/
• See: wikipage
Delft-FIAT+Home
RUN: ADVANCED RUN (2)
• Find location you installed Python (e.g. go through shortcut -> right click > find location)
• Open “python.exe”
• Type execfile({{path cla.py}}) - see screenshot
• If no other Python version installed you can also run from Spyder
RISK CALCULATION FOR MULTIPLE RETURN PERIODS
Damage
Example:
- 3 damage calculations,
RP=10,100 and 1000.
- Risk ($/y) = area under
graph
- No damage assumed
below RP=10
- Area calculated in 5
blocks.
- Risk is sum area blocks.
Probability
𝑅𝑖𝑠𝑘 =
𝐷𝑎𝑚𝑎𝑔𝑒 𝑝 𝑑𝑝
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(0.1-0.01)*10
0.5*(0.1-0.01)*(40-10)
(0.01-0.001)*40
0.5*(0.01-0.001)*(50-40)
0.001*50