evaluation of spatial accessibility to ohio trauma centers using a gis-based gravity model wei chen,...
DESCRIPTION
What affects accessibility? Consider a child looking for a doctor Distance Demand Quality of Service SupplyTRANSCRIPT
![Page 1: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/1.jpg)
Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model
Wei Chen, PhDSenior Systems Programmer
Research Information Solutions and Innovations of Nationwide Children’s Hospital
2015 Ohio GIS ConferenceSeptember 21 - 23, 2015 | Hyatt Regency Columbus| Columbus, Ohio
![Page 2: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/2.jpg)
Accessibility•The ability of receiving quality service by
traveling from one location to another.
![Page 3: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/3.jpg)
What affects accessibility?Consider a child looking for a doctor
Distance Demand Quality of Service
Supply
![Page 4: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/4.jpg)
Law of Gravitation
Distance
DemandQuality of Service
Supply
![Page 5: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/5.jpg)
The Research Question•Identify areas in Ohio with Good and Poor
accessibilities.
Zip codes and counties in Ohio.
![Page 6: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/6.jpg)
Can you visually find out areas with good accessibility?
![Page 7: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/7.jpg)
•Build a GIS model:
GIS helps formalize and automate the process
Di
Sj
P = Diij β
di j
dij
Steps 4-1: Calculate population potential from demand to service.
Population site (Demand)
Service site (Supply)
![Page 8: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/8.jpg)
Build a GIS model, cont.
TPj = i ijD d
− β
m
∑i=1
Steps 4-2: Sum up the total population potential from all demands to each service location.
Population site (Demand)
Service site (Supply)
Di
Sj
di j
![Page 9: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/9.jpg)
Build a GIS model, cont.Steps 4-3: Calculate access potential of demand location to service location.
Di
Sj
di j
Population site (Demand)
Service site (Supply)
![Page 10: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/10.jpg)
Build a GIS model, cont.
n
= ∑ Aij
j =1TAi
Di
dij
Steps 4-4: Sum up the total access of the demand location to all service locations.
Sj Population site (Demand)
Service site (Supply)
This is the final accessibility we are talking about!
![Page 11: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/11.jpg)
Result 3-1:
Accessibility to regional trauma centers on the Zip Code Level.
![Page 12: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/12.jpg)
Result 3-2:
Accessibility to regional trauma centers on the County Level.
![Page 13: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/13.jpg)
Result 3-3a:
Underserved counties in terms of trauma care access.
![Page 14: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/14.jpg)
Result 3-3b:
Underserved counties ranking.
![Page 15: Evaluation of Spatial Accessibility to Ohio Trauma Centers Using a GIS-Based Gravity Model Wei Chen, PhD Senior Systems Programmer Research Information](https://reader035.vdocuments.us/reader035/viewer/2022062503/5a4d1ace7f8b9ab0599708bf/html5/thumbnails/15.jpg)
Conclusions• Accessibility to trauma service is dramatically different
among Ohio counties.
▫ For example, Franklin county is 20 times more advantageous than Hocking county.
▫ The 10 most served counties are about 10 times more accessible to trauma services than the 10 most underserved counties.
• Areas with good access largely cluster near urban centers (3Cs).
• Out-of-state service centers complement some of the needs of access from Ohio population.