Geospatial Positioning Accuracy Standards for Nautical Charting Hydrographic Surveys

1. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys August 5, 2003 Coordination Group Vote on Recommendation for FGDC Endorsement

2. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Parts previously endorsed by FGDC: • Part 1: Reporting Methodology, FGDC-STD-007.1-1998  • Part 2: Standards for Geodetic Networks, • FGDC-STD-007.2-1998  • Part 3: National Standard for Spatial Data Accuracy, • FGDC-STD-007.3-1998  • Part 4: Standards for Architecture, Engineering, Construction and Facility Management, • FGDC-STD-007.4-2002

3. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Provides minimum standards for horizontal and vertical accuracy of features such as: • water depths • objects on seafloor • navigational aids • shoreline • for coastal waters of U.S. and its Territories

4. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Does NOT cover • hydrographic surveys for river and harbor navigation projects • surveys for project construction • Which are covered by Part 4: Standards for Architecture, Engineering, Construction and Facilities Management and Facility Management

5. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Spatial Accuracy: 95% Confidence Level • Horizontal Datum: NAD 83 • Vertical Datum(s): • Mean Lower Low Water (MLLW) for Atlantic, Pacific, and Gulf Coast charts • International Great Lakes Datum (1985) Great Lakes Datum (1985)

6. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys Standards vary by survey classification: • Special Order - Minimum underkeel clearance; hazardous bottom conditions • Order 1 - Greater underkeel clearance than Special Order; soft silt/sand bottom • Order 2 - Depths less than 200 meters not covered by Special Order or Order 1 • Order 3 - Depths greater than 200 meters

7. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Based on International Hydrographic Organization (IHO)Standards for Hydrographic Surveys, Special Publication No. 44 (April 1998) • S-44 developed over 4 years by 60 nations • IHO is a Liaison with ISO Technical Committee 211, Geographic Information • U.S. represented by NIMA and Office of Coast Survey, NOS, NOAA • Web site: http://www.iho.shom.fr/

8. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Standard developed by FGDC Bathymetric Subcommittee (now Marine and Coastal Spatial Data Subcommittee) • Standard released for 90-day public review in November 2000 • Notice to broad-based geospatial data organizations such as ASPRS, ACSM, URISA, and NSGIC, as well as 70+ contacts on Subcommittee mailing list • No comments received during public review • SWG voted to recommend CG approval for FGDC endorsement at its April 10, 2002 meeting

9. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys • Concerns raised by SWG on May 6, 2002 • Document specific differences from IHO S44 • Full compliance with FGDC‑STD‑001‑1998 • Response completed – June 4, 2003

10. FGDC Geospatial Positioning Accuracy Standards, Part 5: Standards for Nautical Charting Hydrographic Surveys Request for FGDC Coordination Group approval for FGDC endorsement Thank you!