Conversion between NAD83(CSRS) to WGS-84

Hi there,

I am looking for a formula to convert coordinates from NAD83 to WGS84.
Could anybody help?

Thanks.

Johnson

gpsabove@gmail.com wrote:


NGS Geodetic Tool Kit - On-line interactive computation of geodetic values
http://www.ngs.noaa.gov/TOOLS

Geodetic Software (Free for PC from NGS)
http://www.ngs.noaa.gov/PC_PROD/pc_prod.shtml

Coordinate and Datum Transformations from Chuck Taylor
http://home.hiwaay.net/~taylorc/toolbox/geodesy/datumtrans/

Datum Conversion Software Comments from David L. Wilson
http://users.erols.com/dlwilson/gpsfaq.htm

Aviation [Navigation] Formulary V1.43 by Ed Williams
http://williams.best.vwh.net/avform.htm

Thank you very much, Sam,

I checked the links, and it seemed that HTDP could do the conversion.
However, no formula was provided.

I saw the conversion between NAD27 and WGS84, but no formula for NAD83
to WGS84 DIRECTLY.

I was looking for the formula and parameters to write up a program. Do
you know where I can find them?

Johnson


Sam Wormley wrote:

gpsabove@gmail.com wrote:

Try: http://www.posc.org/Epicentre.2_2/DataModel/ExamplesofUsage/eu_cs.html

On 13 Sep 2006 21:42:05 -0700, gpsabove@gmail.com wrote:



The differences between NAD83 and WGS84 are chiefly the result of
movement of the Earth's crust. Consequently the differences are small
and vary with time. The relatively simple 3- and 7-parameter formulas
commonly used for transforming points between other pairs of datums
lack the necessary accuracy for a NAD83-to-WGS84 transformation.

I'd suggest using the HTDP source as a starting point for your
program.


--
Chuck Taylor
http://home.hiwaay.net/~taylorc/contact/