Elevation-Derived Hydrography Data Acquisition Specifications: Coordinate Reference System

Elevation-Derived Hydrography Data Acquisition Specifications

Spatial Reference System Requirements

Return to EDH Data Acquisition Specifications Table of Contents

Final products shall be in the coordinate reference systems (CRS) defined in Table 1 and Table 2. If a collection area is composed of multiple elevation data collections, all elevation data shall be processed to one common CRS prior to elevation-derived hydrography compilation.

All geospatial products must meet the following requirements:

**Table 1.** Horizonal CRS
Region	Datum	Coordinate System	GEOID	EPSG	Comments
Alaska (AK)	NAD83(2011) Epoch 2010.00	Alaska Albers	12B	6393	For lidar-based elevation-derived hydrography collection.
AK	NAD83	Alaska Albers	12B	3338	For IfSAR-based elevation-derived hydrography collection.
Contiguous United States (CONUS)	NAD83(2011) Epoch 2010.00	Contiguous USA Albers	18	6350	-
Puerto Rico/Virgin Islands	NAD83(2011) Epoch 2010.00	UTM Zone 19N	18	6348	Puerto Rico split between UTM zones 19N and 20N but should be delivered in zone 19N.
Hawaii (HI) - big island	NAD83(PA11) Epoch 2010.00	UTM Zone 5N	12B	6635	-
HI - others	NAD83(PA11) Epoch 2010.00	UTM Zone 4N	12B	6634	-
American Samoa	NAD83(PA11) Epoch 2010.00	UTM Zone 2S	12B	6636	-
Guam/Saipan North Marianas	NAD83(MA11) Epoch 2010.00	UTM Zone 55N	12B	8693	-

**Table 2.** Vertical CRS
Region	Datum	Coordinate System	GEOID	EPSG	Comments
Alaska (AK)	NAVD88	NAVD88	12B	5703	For lidar-based elevation-derived hydrography collection.
AK	NAVD88	NAVD88	12B	5703	For IfSAR-based elevation-derived hydrography collection.
Contiguous United States (CONUS)	NAVD88	NAVD88	18	5703	-
Puerto Rico	Onshore	Puerto Rico Vertical Datum of 2002	18	1123	-
Hawaii	LMSL	-	12B	-	Each island has its own based local tide datum for vertical reference, no EPSG equivalent.
American Samoa	Onshore	American Samoa Vertical Datum of 2002 (ASVD02)	12B	1125	Revised/superseded in 2020.
Guam	Onshore	NAD83(2011) + Guam Vertical Datum of 2004	12B	1126	Revised/superseded in 2020
North Marianas	Onshore	NAD83(2011) + Northern Marianas Vertical Datum of 2003	12B	1119	Revised/superseded in 2020.
Virgin Islands	Onshore	NAD83(2011) + Virgin Islands Vertical Datum of 2009	12B	1124	Revised/superseded in 2020

Elevation-Derived Hydrography Data Acquisition Specifications: Coordinate Reference System

U.S. Geological Survey

U.S. Department of the Interior