How to convert City of Portland datum to another datum
Below are two tables for converting City of Portland datum both to and from other datums.
To learn more about different types of datum and their historical backgrounds, the National Geodetic Survey maintains an informative list of Frequently Asked Questions.
Conversion Table
| Known Datum to Wanted Datum | ||
| CITY OF PORTLAND | -1.375 | USC & GS 1947 |
| CITY OF PORTLAND | -1.375 | O.D.O.T. ORE ST. HWY TRANS |
| CITY OF PORTLAND | -1.375 | NGVD 29 (APPROX) |
| CITY OF PORTLAND | -1.375 | NGVD 27 (APPROX) |
| CITY OF PORTLAND | +2.10 | NAVD 88 (APPROX) |
| CITY OF PORTLAND | -2.92 | WEATHER BUR GAGE MORRISON BRIDGE |
| CITY OF PORTLAND | -3.22 | US ENG. GAGE STARK ST. |
| CITY OF PORTLAND | -3.22 | US ENG. GAGE VANCOUVER |
| Known Datum to Wanted Datum | ||
| USC & GS 1947 |
+1.375 | CITY OF PORTLAND |
| O.D.O.T. ORE ST. HWY TRANS |
+1.375 | CITY OF PORTLAND |
| NGVD 29 (APPROX) |
+1.375 | CITY OF PORTLAND |
| NGVD 27 (APPROX) |
+1.375 | CITY OF PORTLAND |
| NAVD 88 (APPROX) |
-2.10 | CITY OF PORTLAND |
| WEATHER BUR GAGE MORRISON BRIDGE |
+2.92 | CITY OF PORTLAND |
| US ENG. GAGE STARK ST. |
+3.22 | CITY OF PORTLAND |
| US ENG. GAGE VANCOUVER |
+3.22 | CITY OF PORTLAND |