To create the GeoEvent Service used in the Nighttime Flow Analysis, log into ArcGIS GeoEvent Manager. Then, follow the steps to create the GeoEvent Service.

Sub-DMA to history

1. Add a new GeoEvent Service with the following properties:
   • Service Name: SubDMAtoHistory
   • Service Description: This service monitors SubDMAs and maintains current information and a historical log of the observations.
2. Add the DMAChanges-Input input connector.
3. Add the following outputs connectors:
   • SubDMAHistory-Output
   • SubDMA-Output
4. Add a Processor:

   Parameter	Value
   Name	CalcPrev1
   Processor	Field Calculator
   Expression	PREVGPM
   Target Field	Existing Field
   Existing Field Name	PREVGPM1

5. Add a Processor:

   Parameter	Value
   Name	CalcPrev
   Processor	Field Calculator
   Expression	CURGPM
   Target Field	Existing Field
   Existing Field Name	PREVGPM

6. Add a Processor:

   Parameter	Value
   Name	CalcCurrent
   Processor	Field Calculator
   Expression	OBSGPM
   Target Field	Existing Field
   Existing Field Name	CURGPM

7. Add a Processor:

   Parameter	Value
   Name	CalcDiff
   Processor	Field Calculator
   Expression	OBSGPM - EXPGPM
   Target Field	Existing Field
   Existing Field Name	DIFFGPM

8. Add a Processor:

   Parameter	Value
   Name	Reset Observation
   Processor	Field Calculator
   Expression	0
   Target Field	Existing Field
   Existing Field Name	OBSGPM

9. Add a Processor:

   Parameter	Value
   Name	InputToHistory
   Processor	Field Mapper
   Source GeoEvent Definition	Sub_District_Metered_Areas
   Target GeoEvent Definition	DMA_History

   Update the field map:

   Source Fields	Target Fields
   DMAID	DMAID
   CURGPM	OBSGPM
   EXPGPM	EXPGPM
   DIFFGPM	DIFFGPM

10. Connect the elements in the GeoEvent Service.
11. Publish the SubDMAtoHistory service.