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GIS Coordination on a Statewide Scale usinga Common Toolset Application

Marshall FlynnIT/GIS Manager

Tampa Bay Regional Planning Council

Pinellas Park, FL

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Florida Statewide Regional Evacuation Study

Update Program

GIS Technology Drives the Data & the Analysis

Each Region on its Own in the Past

First Statewide Comprehensive Effort Like This Ever

Product is for State ofFlorida with Regions as Sections

Compatibility, Structure, and Formatting are Key Elements

All ESRI 9.3+ with Spatial Analyst

Common Map Templates

Common Symbology

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Evacuation Zones are the Product Used Most and Seen Most by the

Public, and Used for Evacuation Transportation Modeling

Component

Surge Zones are used as a basis to delineate those Evacuation Zones

Consistent Methodology and Data Essential (11 Regions = 1 State)

State Chose NHC SLOSH Model for Surge Inundation

SRES Program uses SIM* for Post-Processing Surge Zone Creation

Evacuation Zones Then Derived From Surge Zones by County EM Dept.

* Surge Inundation Model

Tropical Storm System Surge Zone ComponentTropical Storm System Surge Zone Component

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Why is This Evacuation Update Such a Good Idea?

Many Regions Have not Updated Their Evacuation Data for Years Processing is 90% automated

Computers 6X Faster than last time (on average)

Available Base Data is so Much Better!

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Light Detection and Ranging

LiDAR Sea, Lake, Overland Surge from HurricanesSLOSH Models

Regional Evacuation

StudiesAnalyses

Vulnerability

Behavioral

Demographics

TransportationStorm Surge Zones

Data ProcessingDevelopment for SLOSH

Begun FY 06-07

Complete FY 08-09

Begun FY 06-07

Complete FY 08-09

Contractors Contractors

National

Hurricane

Center

Regional

Planning

Councils

Regional

Planning

Councils

Begun FY 08-09

Complete FY 09-10

SRES Process Components

FY 09-10

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Sea, Lake, and Overland Surge from Hurricanes

A computerized model developed by the NationalWeatherService (NWS) to estimate storm surge heights and winds

resulting from historical, hypothetical, or predicted

hurricanes.

What is SLOSH?

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What is Storm Surge?

NAVD88

STORM SURGESTORM SURGE is the increase in water level due to a storm (hurricaneis the increase in water level due to a storm (hurricane

/tropical storm / high winds)./tropical storm / high winds).

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LAS Points From LIDAR (Bare Earth)

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Converted to DEM (Larger Cell Size)

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Contractor Processing for SLOSH Input at NHC

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DEFINITIONS:DEFINITIONS:

STORM SURGESTORM SURGE is the increase in water level due tois the increase in water level due to

a storm (hurricane / tropical storm / high winds).a storm (hurricane / tropical storm / high winds).

STORM TIDESTORM TIDE is the total water level during a stormis the total water level during a storm

= Astro Tide + STORM SURGE= Astro Tide + STORM SURGE

+ Rainfall Runoff + Anomaly+ Rainfall Runoff + Anomaly

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SLOSH Hurricane Storm

Surge Model

Solves shallow water equations

Orthogonal curvilinear grid system

2-dimensional (2 dimensional ???)

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SLOSH Hurricane Storm

Surge Model

Overland flooding

Sub-grid Features:

1-dimensional flow for rivers and streams barriers

cuts between barriers

channel flow, with chokes and expansions

Increased friction for trees and mangroves

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SLOSH Hurricane StormSurge Model

Embedded parametric hurricane wind model

Uses a normalized wind profile

Solves diff eqn for wind speed and direction

(Direction is NOT specified a priori)

Uses pressure, not observed wind speed

Forward speed incorporated into asymmetry

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INPUT TO SLOSH

TRACK Positions - latitude & longitude

INTENSITY - (pressure drop)

SIZE - Radius of maximum wind

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SLOSH Hurricane Storm

Surge Model

Model output:

MOMs and MEOWs

Individual runs in real time

Historical hurricane runs

Probabilistic surge forecasts

Available in

SLOSH display format

GIS format (ArcView or MapInfo)

Animations (on web)

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Previous SLOSH Basin(1991)

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2009 SLOSHBasin

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Creating Surge Zones

Data needs to be processed fairly fast

Results should be relatively consistent

Some RPCs have not done surge models

Developed and proven methodology

Fairly easy to use

SRES Phase II: Surge Zones & Evacuation Zones

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Toolset Has its Origin in ArcView 3.2 Using Avenue (2005)

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The New ArcGIS 9.3 Version Uses ArcObjects

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Select your

basin area

Choose Output

Folder

Choose

Raster Cell

Size

Tide: Mean

or High

Calc Model

ValuesDry (99.9)?

Calc Mean,

Max & Min

of Selected

Yes

Replace with

Min-(0.075*Min)

No Replace with

SLOSH Value

Create Centroids

From SLOSH

Basin

Calc Average

of Surrounding

SLOSH Grids

Iterate Thru

Each SLOSH

Grid Square

Interpolate to

Raster using

Spline Tension

SLOSH

Polygon

SLOSH

Surface

Raster

DEM

Raster

Subtract DEM

From SLOSHApply Majority

Filter

Export to

Polygons

Initial

Surge Polys

Per Category

Buffer Outside

of Sea Polys by

50 Feet

Sea/Surge

Source

Polys

Reduce Noise:

Absorb Area

< 0.25 Acre

Dissolve by

Value

Select by

Location Surge

That Intersects

Buffered Sea

Select Surge:

Value = 1

Contiguous

Surge

Polygons

Input Data = Green

Output Data = Yellow

To Cat Layer

Combine

SRES Surge Tool

Category Zone Module

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From Zone

Module

Cat 1

Cat 2

Union Cat plus

Next Highest CatCat 1_2

Union Cat plus

Next Highest Cat

Cat 3

Cat 1_3

Union Cat plus

Next Highest CatCat 4

Cat 1_4

Union Cat plus

Next Highest CatCat 5

Cat 1_5

Select and Fill

Cat Field with

Associated

Cat Number

Add Cat Field

Dissolve by

Cat Singlepart

Apply Defined

Symbol RendererFinished Displayed Surge

Creating Surge

Composite Shapefile

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SLOSH Display Program Category 4

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This is not what the real world is like

SLOSH grids actually much bigger

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Spatial Analyst

Works in RasterFormat

Faster processing large numbers than vector

Readily converts back to vector

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The previous slide demonstrates the surge heights (which are based on

average elevation per grid) in MOM basin with square edges

We know that water does not behave like this

How do we get a realistic depiction of surge height with respect to thereal terrain underneath?

Interpolation of grid heights

Creates a smooth surface for further topographical processing

The results allow a realistic depiction of inundation of terrain

Modeling MOM Values into Realistic Surge

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An area withSLOSHMOMs in their default square

basin form. Circled areawould be devoid of surge if

not interpolated.

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You can see how theinterpolation hugs the

terrain as in real life. That

is wh

at you are looking for.

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Surge Model Inundation Category 4 (1 4)

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Surge Model Toolset for GIS Processing

Updated High Resolution Elevation Data

Updated SLOSH Maximum of Maximum Data

Aerial Imagery (QA Checks for Data)

WaterFeature Data for Surge Origination

These Are Needed:These Are Needed:

How Do We Get There?

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Shows the relief detail of Digital Elevation, if shaded and shadowed

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LIDAR Derived Shoreline From Contractors

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LIDAR Derived Shoreline With NHD High Res

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WhyWater features are needed..

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Imagery SupportsWaterFlow Under Bridges, etc.

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Water Polygons Allow Contiguous Selection Beyond

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Contiguous Inundation No Longer Stopped

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Water features do not Create Surge where there is

none.

They merely allow Contiguous Selection further than

Inundation Polygon stopped by Higher ElevationStructures Above Flow.

Bridges, Culverts, and Tunnels are Examples of

These.

Points to Consider:

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The Result From a Surge Model Run:

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Surge zone shapefiles from adjoining areas are merged to county

level (if needed)

They are inspected for smooth transition and anomalies are

corrected Then they are inspected and edited to foster a smooth transition

within the region

The files are used for Storm Tide Atlas and creating preliminary

evacuation zones

QA/QC and Regional Surge Clean-up

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This is a case, generally

where older surge covers

less inland areas

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Where the new surge

goes further inland

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This is not always the case, as

in many areas of Pinellas County

the newer surge Cat 1 (CHHA)covers less area.

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As you can see here.

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Why is this?

Most likely due to SLOSH basin resolution differences

Last basin used (1991) had larger grid cells, so less variation

SLOSH values are now derived from better topography changes

Elevation data this time is processed at a 5ft pixel size, which

Has finer scale to catch topography changes (stopping surge)

Picks up more nuances like depressions, which divert flow away There is no hard-fast rule that says the new surge will always be greater at all category

levels.

That being said, it does appear that higher categories (4 & 5) have a greater chance at having moreinundation

DS M B k W U d F Atl C il ti

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DS MapBooks Was Used For Atlas Compilation

Page Detail:

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Page Detail:

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Surge Zones Are Used For Evacuation Zone Choices

How a County May Delineate the Evacuation ZonesHow a County May Delineate the Evacuation Zones

Surge Boundaries with Parcel Boundaries

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Surge Boundaries with Parcel Boundaries

Selected Surge Zone

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Selected Surge Zone

Evac Zone Boundaries Brought Out to Road and Parcel Boundaries

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Evac Zone Boundaries Brought Out to Road and Parcel Boundaries

These would be

removed

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Thanks, and Have a Great Day!

SRES Program

2007-2010

Florida