he City and
We recommend the projection with NAD 83 Harn for several reasons. It supports the use of survey grade GPS, it is more accurate than NAD 83 and has become the modern standard at the National Geodetic Survey.
he City and
Projection: State Plane
Datum: NAD 83 Harn
ArcGIS Projection File Name: NAD_1983_HARN_StatePlane_Hawaii_3_FIPS_5103_Feet
Spheroid: GRS 1980
NOTE: Except for the registered plat maps, all data on this ftp site is in Projection #1 (Nad 83 Harn datum).
The North American Datum of 1983 (NAD 83) is "The horizontal control datum for the United States, Canada, Mexico, and Central America, based on a geocentric origin and the Geodetic Reference System 1980.
"This datum, designated as NAD 83, is the new geodetic reference system. ... NAD 83 is based on the adjustment of 250,000 points including 600 satellite Doppler stations which constrain the system to a geocentric origin." (Geodetic Glossary, pp 57)
A High Accuracy Reference Network (HARN) and a High
Precision Geodetic Network (HPGN) were two designations used for a statewide
geodetic network upgrade. The generic acronym HARN is now used for both HARN
and HPGN and was adopted to remove the confusion arising from the use of two
acronyms. A HARN is a statewide or regional upgrade in accuracy of NAD 83
coordinates using Global Positioning System (GPS) observations. HARNs were observed to support the use of GPS by Federal,
state, and local surveyors, geodesists, and many other applications. The
cooperative network upgrading program began in
1) ArcGIS Projection File Details:
2) ArcGIS Projection File Details:
This FTP site provides public access to Geographic Information System(GIS) files developed and/or maintained by the City & County of Honolulu. It is brought to you in cooperation with the Honolulu Board of Realtors, host of this site.
Data contained in these files or on
this Web page is the property of theCity and
Old Notes (from
Richard Stone, ESRI,
When using, ArcInfo's PROJECT or PROJECTDEFINE commands on
8.02 workstation or 7.x, may have to specify "NAD 1927" datum because it does not include Old Hawaiian datum as a choice.
With ArcView shapefiles, the ArcView 3.2 Projection Utility (APU) may give undesirable results.
The best way to project shapefiles is to use the Hawaii Datum and Projection
extension which ESRI,
http://gis.esri.com/arcscripts/scripts.cfm Search by keyword "