That the datum plane, now in use in the City of Los Angeles be, and the same is hereby abandoned; and that the United States Geological Survey Datum Plane be, and the same is hereby adopted as to the official datum plane for the City of Los Angeles.

The datum used by the U.S. Geological Survey is mean sea level, officially known as the "Sea Level Datum of 1929". Its effect was to add 5.775 feet to elevations based upon the abandoned datum to obtain elevations based on the adopted datum. On April 1, 1978 the City of Los Angeles adopted Ordinance Number 150,763 and changed the name of its datum plane to the National Geodetic Vertical Datum of 1929. Ordinance Number 150,763 states:

Section 1. Article 2 of Division 1 of the Los Angeles Administrative Code is hereby amended by adding Section 1.18 hereto, said section to read.

SEC.1.18. DATUM PLANE FOR THE CITY

The National Geodetic Vertical Datum of 1929 is hereby designated as the Official Datum Plane for the City of Los Angeles.

Sec.2. All ordinances, resolutions or parts of ordinances and resolutions or other official records in conflict with this ordinance are hereby repealed.

Sec.3. The City Clerk shall certify to the passage of this ordinance and cause the same to be published in some daily newspaper printed and published in the City of Los Angeles.

I hereby certify that the foregoing ordinance was passed by the Council of the City of Los Angeles. at is meeting of April 3, 1978.

Approved April 11, 1978

REX E. LAYTON, City Clerk

by Edward S. Ashdown. Deputy

File No. 77-559

TOM BRADLEY, Mayor

(JA22165) April 19

The new datum name conforms to the Federal designation in the Federal Register, Volume 38, No. 94, page 12840, May 16, 1973. This change is a change in name only and requires no changes in elevation. Figure 2 is a graphic representation of various data planes in the Los Angeles area.