This webinar will describe the collection of data, models, analysis and distribution that is the California Spatial Reference System. Pertinent to the practice of Professional Land Surveying, these include:

• California Spatial Reference Network (CSRN) with its latest Epoch 2025.00 realization,
• SOPAC archive of RINEX files and metadata for post-processed control surveys,
• MGViz network map and timeseries visualizer with GeoJSON export,
• CRTN real-time GNSS correction streaming with PRC compliant base station coordinates,
• SCIP 4d dynamic datum application updated weekly,
• References and guidelines for surveying accuracy and basis of bearings,
• Outreach and education through semi-annual Coordinating Council meetings and lectures,
• SIO Master of Science and PhD degree program in Geodesy.