|SPECIFICATIONS FOR SURVEYS ON THE CALIFORNIA COORDINATE SYSTEM
following specifications apply to surveys on the California Coordinate System of 1983
based on the NAD 83 Datum. Local ordinances and state regulations dictate circumstances
under which surveys must be tied to state plane or NAD 83 coordinates. (See "Instructions
for the Monumenting and Field Notes of Tract Boundaries and Street Centerlines"
, LA County Engineer, 3-31-82 from LACDPW Land Development Division
- All points coincident with County Geodetic Control Points will have
the exact published coordinate values in U.S. survey feet. If a survey is initiated prior
to publication of a re-adjustment, the previously adjusted values will be accepted for a
period of up to 90 days from the date of current publication.
- The whole number for the coordinate will be shown (i.e. no constant
will be applied).
- One point on the external boundary will have a grid coordinate value.
All other points on or internal to the boundary will have coordinates based on
computations from the grid boundary point using ground distances. The boundary point
assigned grid coordinate values should be on the major control line where applicable. The
boundary point assigned a grid value will be annotated with the grid coordinates.
- A tie to the geodetic control network will be made to the
boundary point showing the California Coordinate System values. Additional ties as required
by Ordinance 99-0080 will also be provided.
- The combination factor and coordinate system information, including
the date of adjustment, will appear on the recorded map.
- The difference between computed tie distances and annotated tie
distances multiplied by the combination factor will not exceed 0.02 feet.