GIS Expo 2014: Transformations between the geodetic datums of hawaii

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Information about GIS Expo 2014: Transformations between the geodetic datums of hawaii
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Published on March 21, 2014

Author: higicc

Source: slideshare.net

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Presentation by Sarah Falzarano, Army Corps of Engineers

US Army Corps of Engineers BUILDING STRONG® Sarah Falzarano, GISP 14 March 2014 Transformations between the Geodetic Datums of Hawaii Using ArcGIS

BUILDING STRONG® Coordinate Systems  Geographic Coordinate System  Projected Coordinate System  X and Y values will vary depending on horizontal datum

BUILDING STRONG® Geodetic Datum  The earth is not a perfect sphere ►Bulge at the equator  Using a combination of an ellipsoid and geoid, a datum is born ►Creates the best possible fit • Specific to a geographic location  Used in conjunction with a coordinate system

BUILDING STRONG® Coordinate Systems and Datums for Hawaii Coordinate System  Geographic  Hawaii State Plane  UTM Datum  WGS 1984  NAD 1983 ► NAD 1983 (1986) ► NAD 1983 HARN (1993) ► NAD 1983 PA11 (2011)  Old Hawaiian Datum

BUILDING STRONG® NGS Adjusted NAD83  National Adjustment of 2011  NAD83 PA11 for the Pacific Plate ► State of Hawaii ► American Samoa ► Republic of the Marshall Islands  NAD83 MA11 for the Mariana Plate ► Commonwealth of the Northern Mariana Islands ► Guam ► Palau  NAD83 2011 for North America

BUILDING STRONG® CORS Stations  Use NAD83 PA11 ►Sometimes this is referred to as NAD83 2010.00 epoch ►Many surveyors refer to NAD83 epoch 2010 • Or they may report their data simply as NAD83 • If it is recent data, it is most NAD83 PA11

BUILDING STRONG®

BUILDING STRONG® Datum Transformations  Designed for a particular area  Have associated errors  Errors compound every time a transformation is done  Consistency is key ►Use the same transformation each time

BUILDING STRONG® Projecting Data in ArcGIS

BUILDING STRONG® Projecting Data in ArcGIS

BUILDING STRONG® Project on-the-fly

BUILDING STRONG® Project on-the-fly

BUILDING STRONG® Project on-the-fly

BUILDING STRONG® Project on-the-fly

No longer recommended No longer recommended No longer recommended OutdatedDatumTransformation Recommendations

BUILDING STRONG® Recommended Datum Transformations From To Transformation Error (m) Old Hawaiian Datum NAD83 (86) Old_Hawaiian_To_NAD_1983 0.20 NAD83 HARN Old_Hawaiian_To_NAD_1983_HARN_Hawaii 0.05 NAD83 PA11 Old_Hawaiian_To_WGS_1984_8 + WGS_1984_(ITRF08)_To_NAD_1983_PA11 2.10 WGS84 Old_Hawaiian_To_NAD_1983_HARN_Hawaii + WGS_1984_(ITRF00)_To_NAD_1983_HARN 0.15 NAD83 (86) NAD83 HARN NAD_1983_To_HARN_Hawaii 0.05 NAD83 PA11 WGS_1984_(ITRF00)_to_NAD_1983 + WGS_1984_(ITRF08)_To_NAD_1983_PA11 0.15 WGS84 WGS_1984_(ITRF00)_To_NAD_1983 0.10 NAD83 HARN NAD83 PA11 WGS_1984_(ITRF08)_To_NAD_1983_PA11 + WGS_1984_(ITRF00)_To_NAD_1983_HARN 0.15 WGS84 WGS_1984_(ITRF00)_To_NAD_1983_HARN 0.10 NAD83 PA11 WGS84 WGS_1984_(ITRF08)_To_NAD_1983_PA11 0.05

BUILDING STRONG® ArcGIS Projection and Transformation Files Specific to Hawaii  Version 10.2.1 ►Includes files  Prior to version 10.2.1 ►Will need to copy files to your profile ►Composite transformations not available prior to 10.1 ►Contact myself or Craig Clouet for files and instructions

BUILDING STRONG® Questions? Sarah.R.Falzarano@usace.army.mil

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