1. GeoPlanner: Site Suitability Analysis
Rob Stauder
Esri Corporate Template-Dark v3.3
16:9 version – January 21, 2016
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2. Suitability Modeling using Weighted Raster Overlay
GeoPlanner allows you to perform suitability analysis through a technique known as weighted raster overlay
Think of this as finding the best location, or finding risks and opportunities in an area

3. What is Weighted Raster Overlay?
Overview
Input Rasters
Output Image
Classify
Weight
Combine
WRO – analysis technique that allows you to:
Classify, weight, and combine several different types of information and visualize it so you can evaluate multiple factors at once

4. Site Risk Analysis Where is fire risk highest in the forest? Factors
layers that would help us identify high fire risk
Example: Lake Fire, San Bernardino Mountains, June 2015
Image:

5. Site Suitability Analysis
Which locations are suitable for a new housing development?
Image:

6. How Does Weighted Overlay Work?
Overview
Conceptually:
Values within each raster layer are classified or normalized to a common suitability scale
Layer assigned a weight, as a percentage – allows you to emphasize the importance of that layer
all raster layers in the analysis are overlaid
Cells that overlay are totaled
Output values mapped to a color ramp

7. Weighted Raster Overlay Services
Implemented as image services with raster functions
ArcGIS Server
Mosaic
Image Service
GeoPlanner
The system works by:
Create a mosaic dataset
Share to AGS and an image layer
Access layer in GeoPlanner
Process is enabled by a raster function – a “rendering rule”
Creates no intermediate datasets –
Function or rule controls how pixels are painted
Process is fast
Raster Function

8. Demo

9. Use Your Data
Build your own weighted overlay service

10. Build a Weighted Overlay Service
System Requirements
ArcGIS or newer
Desktop
Weighted Overlay Service Toolbox
Server Advanced
ArcGIS Online or Portal for ArcGIS
GeoPlanner for ArcGIS

11. Build a Weighted Overlay Service
Process Overview
There are three steps:
Prepare your rasters
Load your rasters into a mosaic & add some additional information
Share to ArcGIS Server which adds an item to your portal or AGOL org
Then you can access the service from GeoPlanner
Prepare Data
Build Mosaic
Share Service
Access Service

12. Build a Weighted Overlay Service
Prepare your data – Convert to TIF
Raster
.tif
Vector
Convert your data to TIFFs
Try to use the same cell size
Optionally:
Handle no data – calc to another value
Use web Mercator for spatial ref
No Data?

13. Build a Weighted Overlay Service
Prepare your data – Create a suitability scale
In Data Ranges (deg)
Suitability Value
0 – 5 9
5 – 14 7
14 – 22 5
22 – 31 3 1
Next you need to classify or normalize you dataset values in each raster to a common scale
On the left is a classification of values 0-82 in 5 groups
We need to normalize each classification range to a common scale.
allows us to compare (overlay) different ranges of values from different datasets
<click> Input data values of 0-5 are normalized to suitability value of 9 –
Subjective – 9 usually indicates highly suitable.
Suitable for what? In this case, perhaps a new housing development or a dog park
Probably not suitable for a ski area.

14. Build a Weighted Overlay Service
Build a mosaic dataset
Mosaic
Once we have created a suitability scale for all input rasters
Run a special build mosaic tool to create our mosaic
Adds fields to store input data ranges and suitability scale output values
Created as web Mercator
In a File GDB
fGDB

15. Build a Weighted Overlay Service
Share the mosaic dataset as a service
ArcGIS Server
Mosaic
Once the mosaic is created –
Share it as an image service to ArcGIS Server
Creates a service URL that is shared as an item to AGOL or portal
Image Service
Access Service

16. Demo

17. Want to learn more? Documentation Additional Resources
Build your own weighted overlay service
Additional Resources
Weighted Overlay Service Toolbox
Want Esri to build and host your service?
Managed Services

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