PRS92 / Philippines zone 3 - EPSG:3123

Emlid Flow & Emlid Flow 360 Coordinate Systems
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Hi Everyone,

  1. I am working on a survey project, required to use PRS 92 (ESPG:3123)
  2. I manually entered a WGS 84 Coordinates in an emlid Base
  3. We started to collect data in a PRS 92 X & Y Coordintes
  4. And as per checking of my Northing Easting Results in GIS Software and excel my coordinates are off by ±80 meters

Does anyone have the same experience using different projections?

Please help

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EPSG:3123 referenced SPHEROID[“Clarke 1866”,6378206.4,294.978698213898]

TOWGS84[-127.62,-67.24,-47.04,3.068,-4.903,-1.578,-1.06]

To help understand the 7-parameter transformation (translation + rotation + scaling) that’s involved in going from PRS 92 (ESPG:3123) to WGS84, study the section under the heading towgs84.

https://svn.osgeo.org/metacrs/proj/tags/proj_4_5_0/proj/html/gen_parms.html

If you collect and process your geodetic data in WGS84; i.e., lat,log,ellip(m), you could then perform a conversion to PRS 92 using an online service.

In doing a Google search for “online transformation calculator from WGS84 to PRS 92” you’ll find several options.

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Hi @cbccsi,

Emlid Flow doesn’t support the transformation between PRS92 and WGS84 now, but you can add it with a Custom CS. Please walk through this step-by-step guide from our docs to create it. For PRS92 / Philippines zone 3, you’ll need to choose the GRS80 ellipsoid and add the parameters for transformation and projection. You can find them by these links on epsg.org.

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Hi @cbccsi ,

I just wanted to update you that we’ve released the support for PRS92 with the datum conversion from WGS84. Now, you can use PTM projections based on the PRS92 datum.

To use any CS based on PRS92 datum, your base or NTRIP service should be in WGS84. The Helmert (7-parameters) performs the datum conversion.

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