You are here

PG&E Corporation

Picarro Leak Survey Data Integration with GIS Data

Picarro to Field UDC Project Profile

The Picarro Surveyor is a system that searches for and grades potential natural gas leaks reporting data back to utilities for investigation. The objective of the UDC Picarro project was to provide an automated process to integrate the Picarro data into the PG&E Gas Distribution GIS database. The data would be displayed on the Leak Survey Maps and then be available to create custom maps within the GIS for use in the field.

Automating the process of analyzing data collected by the Picarro system and integrating it more accurately lessens the gap between collection and display into the PG&E GIS system. The increase in accuracy enables field investigators to efficiently and effectively verify the validity of the report by comparing leak data to asset locations and reduces the investigation of false positives within the Picarro data.  

UDC’s specific task was to develop a tool to automate the process of analyzing the Picarro Esri Shape file data using Gas Distribution GIS data and create new features in GD GIS using the outputs. The process analyzes where the Picarro polygons interact with the GD GIS features Distribution, Main and Service using specific rules to create buffer polygons. Features created are Leak Indication Search Areas (LISAs) and Gaps.

UDC then developed the process for adding the newly created features into the Gas Distribution GIS database which included:

  • Appending the new features to the existing Picarro Feature Class
  • Data model changes required to support the integration of the Picarro-provided Esri Shape files
  • Overwriting any areas being re-surveyed 

The automatic Leak Survey Map output functionality adds any Leak Survey Polygon that is affected by the addition of the Picarro features to the nightly map generation process. Newly added features are tracked in Gas Distribution GIS by Leak Survey Grid.