LAC 43:XXVII.505. Vertical Datum

A. All vertical control densification shall be based upon the National Geodetic Vertical Datum of 1929 (NGVD 29), latest adjustment, as established and published by NGS. B. Following final development and publication of the new North American Vertical Datum of 1988 (NAVD 88), all subsequent vertical control densification shall be based on the NAVD 88 datum. C. Optional survey references may be established between the NGVD 29 and subsequent NAVD 88 datum for correlation of archival vertical control data. However, coordinate transformation programs or computational techniques shall not be used to convert elevations from one datum to another without local field survey network verification.