GPS Control Work Image 

Horizontal and Vertical Control Networks

Vertical Control Network

The City of Santa Rosa's Vertical Control Network is based on the National Geodetic Vertical Datum of 1929 (NGVD 29). There are over 1300 benchmarks located throughout the city as well as the surrounding area.

This system is tied directly and adjusted to USC&GS (now the NGS) Bench Marks in the area.

Data for City of Santa Rosa Bench Marks can be obtained through the City's GIS System. History and background information for the City’s Vertical Control Network is available.

Horizontal Control Network

The original city of Santa Rosa Coordinate Monument network was published with values based upon the California Coordinate System Zone 2, NAD 1927. The current City of Santa Rosa Coordinate Monument Network is based upon NAD 1983 with State Plane Coordinate (Zone 2) values published in both NAD 83 - 91.35 epoch and NAD 83 (2011) epoch 2010.00 values. Locations and data for City of Santa Rosa coordinate monuments can be obtained through the City’s GIS system. History and background information for these Horizontal Control Networks is available.

Smartphone Access to H & V Control Data

Coordinate Monument and Bench Mark data (as well as the City's GIS System) can now be accessed with a smartphone.

Instructions for Smartphone use

  • Using your Smartphone navigate to the HTML 5 version of the City of Santa Rosa's GIS page.
  • Click on the layer icon (far right of the control bar)
  • Expand "Capital Improvements Engineering"
  • Check the "Survey" layer. You can turn off Address, Sewer and Water layers to help make the map less congested.
  • Go back to the map by pressing the Map icon on the control bar.
  • Zoom in to the area you need information for until you find the Bench Mark (a number preceded by a letter) or Coordinate Monument (numbered) that you need information for.
  • Click on the Orange "I want to" button on the Control Bar and then select "Identify by rectangle."
  • Drag on the map to draw a rectangle over the monuments you need information for.

Business Hours
8:00 AM - 5:00 PM
Monday to Friday

TEL: 707-543-3834
FAX: 707-543-3801

Municipal Services Center
69 Stony Circle
Santa Rosa, CA 95404

view our location using Google Maps