Pacific Island GIS & RS User Conference USP Japan ICT Auditorium, Suva Fiji Islands Pacific Island GIS & RS User Conference 28 Nov – 1 Dec 2016

Tracing linear networks Ken Mathers – Senior Consultant Nov 2016

Visitor to Fiji since 1994

Agenda Linear Networks Introduction Architecture Tracing Networks Types of trace Trace results Trace Post reporting Batch Tracing

Linear networks

Defining linear networks There are many linear networks Road networks River networks Electrical networks Gas and Water networks

Different trace logic can be applied Linear logic Directional Non directional Point to Point Shortest Path Lowest Cost Distance based

Different trace logic can be applied Trace logic similar to data flow but not quite. One input Decisions involve Stop at item Include item in result Produce result based on current record

Trace Results The results of a trace include A graphical display (optional) ID of every traced item Upstream source Sequence at current step Depth (number of steps through the trace)

Creating Linear Paths Use Geometry to identify relationships Store results in Open Tabular format

Tracing Linear Paths Interactive traces Batch Traces Post Processes on results Store results in Tabular form

Trace and Reporting Separate the reporting from the trace Allow many reports from one trace Allow reporting of related data Allow summary reports Traces Reports

Demonstration