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Applied Linear Referencing

This study investigates salinity levels in the South Old River (SOR), which at times exceeds the salinity objectives set by the SWRCB. Lead scientist Barry Montoya initiated transect studies in 2009, using Electrical Conductivity (EC) to measure salinity. The research involves analyzing extensive transect data collected under various tidal conditions. A significant challenge is comparing GPS coordinates of transects, necessitating a solution using linear referencing methods in ArcGIS, enabling easier data comparison with river features and enhancing understanding of salinity sources.

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Applied Linear Referencing

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  1. Applied Linear Referencing Mapping Salinity in the South Old River Aaron Cuthbertson, ES, O&M Barry Montoya, Staff ES, O&M

  2. Background – Salinity in SOR • SWRCB has set salinity objectives for the South Delta • South Old River at times exceeds salinity objectives set by SWRCB • The objective of the study is to gain a better understanding of the sources of salinity in the South Old River

  3. Background – Salinity in SOR • Lead Scientist – Barry Montoya • Began doing transects of SOR in 2009 • Salinity is typically measured by Electrical Conductivity (EC) – the more conductive a solution is, the saltier. Seawater conducts electricity very well; distilled water conducts very poorly.

  4. Background – Sampling Equip Datalogger GPS 6 MPH EC Sensor

  5. Background – Transect route

  6. Background – Lots of Data • Many transects recorded • Under different tidal conditions • During different times of the year

  7. Problem – GPS (XY) Coordinates • How do we compare one transect with another based on GPS coordinates? • How do we compare transect data to fixed features along the river?

  8. Problem – GPS (XY) Coordinates

  9. USS Enterprise GIS

  10. What do we want? • Ability to easily compare different transects based on location of data points • Ability to compare transects to important features on river, such as discharge pipes

  11. Solution: Simplify the data

  12. Simplify the data

  13. How do we convert XY to dist?

  14. Linear Referencing in ArcGIS

  15. Route feature class • route = polyline feature class with an embedded measurement system • In ArcGIS, the term route refers to any linear feature, such as a city street, highway, river, or pipe, that has a unique identifier and a common measurement system along each linear feature.

  16. Create a reference line (route)

  17. Create a reference line (route)

  18. Linear Referencing - process Point Feature class Event Table Locate features along routes tool Route Feature Class

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