implementation of arcgis © geoprocessing models to understand and delineate areas damaged by the...
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Implementation of ArcGIS©
Geoprocessing Models to Understand and Delineate Areas Damaged by the
Tornadoes of Spring 2011
Abi DhakalGIS SpecialistAlabama Forestry Commission
• AFC Implemented Methods to Acquire Tornado Damage Data
• Techniques Used to Create Geospatial Data of the Tornado- Damaged Paths
• AFC’s Coordination with the State’s GIS Task Force for Tornado Data
• ArcGIS Geoprocessing Models
• Conclusion
Alabama Forestry Commission (AFC)Alabama Forestry Commission (AFC)
• AFC pilots were tasked to send in GPS Exchange Format (GPX) files of the tornado-impacted areas to the AFC State Headquarters.
• The GPX files came in as waypoints and tracks.• Waypoints were sent for impacted areas where significant linear
damage was minimal.• Tracks were sent for areas of significant linear damage.• The GPX files were converted to feature classes using DNR Garmin.
• Data was also obtained from NOAA’s National Weather Service.
• Some of the tornado-damaged paths were obtained from the State FTP site, facilitated by Information Services Division (ISD).
AFC Implemented Methods to Acquire AFC Implemented Methods to Acquire Tornado Damage DataTornado Damage Data
Techniques Used to Create Geospatial Techniques Used to Create Geospatial Data of the Tornado-Damaged PathsData of the Tornado-Damaged Paths
• Waypoint data included estimates of damaged areas that were converted to circular polygons.
• Track data included ‘width of damage’ estimates and were used to make polygons of damaged areas.
• Polygon data received for the tornado damage was used “as is,” assuming data was collected approximately over the damaged areas.
AFC’s Coordination with the State’s AFC’s Coordination with the State’s GIS Task Force for Tornado DataGIS Task Force for Tornado Data
• AFC regularly participated in State GIS Task Force telephone conferences in the immediate aftermath of the tornadoes and as required thereafter.
• AFC, with its limited resources, effectively contributed to the understanding of the extent of the tornado damage.
• Maps of tornado damage extent, as well as data acquired and developed was shared through the State’s FTP site.
• Comparative analysis of data from various sources would result in more accurate data development, consequently leveraging the understanding of the extent of the damage.
Tornado moves through Tuscaloosa, Alabama
Tuscaloosa News
ArcGIS Geoprocessing ModelsArcGIS Geoprocessing Models AFC developed several geoprocessing models to accommodate most of the
outputs required by the agency.
• The required outputs included:• Extraction of all land parcels in the path of the tornadoes.• Extracted parcels were attributed with Section, Township, and Range (STR) information.• Extracted parcels were identified for urban or rural locations.• The parcels were further geoprocessed with National Land Cover Database (NLCD) and
Wildfire Susceptibility Index (WFSI) data for forest cover and susceptibility to fire.
Tuscaloosa, Alabama
Sequestering Tornado-Damaged Parcels, Sequestering Tornado-Damaged Parcels, Calculating Acres, and Appending STRCalculating Acres, and Appending STR
Appending NLCD and WFSI Values Appending NLCD and WFSI Values to the Parcel Recordsto the Parcel Records
Results/Example
Anderson Hills, Madison County Wednesday, April 27, 2011
Impacted Madison Parcels NLCD Value
The Huntsville Times
Geiger, Alabama
Impacted Sumter Parcels WFSI Value
Results/Example
The Tuscaloosa News
Results of the ArcGIS Geoprocessing ModelsResults of the ArcGIS Geoprocessing Models• All parcels in the path of the tornadoes were identified.• Holdings of greater than 10-acre parcels on the tornado path were identified for a
separate analysis.• The parcels were intersected with STR Information for ease of identification.• The parcels were also identified in terms of rural and urban locations.• Wildfire Susceptibility Index (WFSI) And National Land Cover Database (NlCD)
values were appended to the parcel records.
Adger Fire, June, 2011 (Jefferson County)
AFC Generated Mapbook by CountyAFC Generated Mapbook by County
4
Center Point
Pleasant Grove
Irondale
Irondale
Hueytown
Homewood
Gardendale
Fairfield
Bessemer
Vestavia Hills
Birmingham
Birmingham
Leeds
459
459
20
11
16
34
27
35
26
22
15
23
14
09
33
10
03
11
02
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36
25
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25 30
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34
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T13ST13S
T14ST14S
T15ST15S
T16ST16S
T17ST17S
T18ST18S
T19ST19S
T20ST20S
T21ST21S
R01E
R01E
R01W
R01W
R02W
R02W
R03W
R03W
R04W
R04W
R05W
R05W
R06W
R06W
R07W
R07W
R08W
R08W
Map Subject To Change With Additional Information And Analysis
Legend
April Tornadoes
Date
4/27/2011
4/15/2011
Township & Range
Sections
Population < 10,000
Population > = 10,000
Date: 9/13/2011
TORNADOESAPRIL 2011
JEFFERSON COUNTY
10
85
20
65
59
59
65
20
Baldwin
Mobile
Clarke
Dallas
Lee
Pike
Jackson
Monroe
Wilcox
Hale
Bibb
Perry
Butler
Clay
Sumter
JeffersonTuscaloosa
Shelby
Walker
Dale
Barbour
Pickens
Marengo
Marion
Covington
DeKalb
Coffee
Coosa
Blount
Chilton
Escambia
Madison
ConecuhWashington
Lamar
Henry
Cullman
Elmore
Macon
Greene
Russell
Bullock
Colbert
Fayette St. Clair
Lowndes
Franklin
Talladega
Morgan
Winston
Lawrence
Marshall
Geneva
Calhoun
Tallapoosa
Etowah
Autauga
Houston
Montgomery
Lauderdale
Cherokee
Cleburne
Randolph
Cre
nsha
w
Limestone
Chambers
10
65
Map Subject To Change With Additional Information And Analysis
Legend
April Tornadoes
Date
4/27/2011
4/15/2011
Population < 10,000
Population > = 10,000
0 38 7619 Miles1 in = 38 miles
Date: 9/14/2011
URBAN IMPACTFROM APRIL 2011 TORNADOES Urban Impact from April 2011 TornadoesUrban Impact from April 2011 Tornadoes
ConclusionConclusion
• AFC resources and preliminary National Weather Service data were used to determine the path of damage.
• The ArcGIS geoprocessing models were developed within days of the tornado impact.
• The models helped AFC understand the extent of damage by the April tornadoes.
• This greatly reduced the time for analysis.
• Geoprocessing models, used with accurate tornado-path data, produce results of high confidence.
• Alabama’s Information Service Division (ISD) sent the model to Joplin, Missouri.
Contact Information:
ABI DHAKALALABAMA FORESTRY COMMISSION513 MADISON AVENUEMONTGOMERY, ALABAMA 36104PHONE : 334-240-9365EMAIL: [email protected]
PATRICK GLASSALABAMA FORESTRY COMMISSIONASSISTANT STATE FORESTERPHONE : 334-240-9367EMAIL : [email protected]
http://www.youtube.com/watch?v=nkUJUqSTOA0
Abi DhakalGIS SpecialistAlabama Forestry Commission
Questions?Questions?
ArcGIS Geoprocessing ModelArcGIS Geoprocessing Model
Model.wmv
ABSTRACTABSTRACTThe spring 2011 tornadoes were recorded in more than half of Alabama’s counties. The ArcGIS geoprocessing models implemented by the Alabama Forestry Commission (AFC) were very effective in classifying areas of tornado damage. The models were used to classify forested versus non-forested parcels, parcels with varying Wildfire Susceptibility Indices, and segregating parcels into urban and rural classes. The ArcGIS geoprocessing models provided quick analyses of the damaged areas. The AFC effectively coordinated with the State’s GIS Task Force to share knowledge of the tornado damage and eliminate redundancy in analysis processes. The AFC collected GPS Exchange Format (GPX) files on the tornado paths that were converted to feature classes for GIS analysis to meet agency objectives.
The results of the analysis were used by Alabama’s Congressional Delegation to document a supplemental funding request for the USDA Farm Services Agency’s Emergency Forest Restoration Program. Results are also being used by the AFC, Alabama Forestry Recovery Task Force, Alabama Cooperative Extension Service, and other agencies to manage recovery of the forest resources.