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I have received a set of local transformation parameters from my surveyor to go from WGS84/UTM36S to ARC1950/UTM36S (See picture below)

The way QGIS does the transformation is not the best. I am working in Malawi and the default transformation parameters give misplacements of 20 to 40 m. This is why I ask a very reliable local surveyor to provide the local parameters for the area of interest.

What is the proper way to write a proj line to introduce these parameters into QGIS?

I was trying: +proj=utm +zone=36 +south +datum=WGS84 +units=m +no_defs +x=249.7578 +y=2.8706 +z=203.0842 +rx=-14.90782 +ry=-6.25396 +rz=0.20011 +s=-7.3003

But it does not seem to work.

Transformation Parameters

  • QGIS has both of these ellipsoid/CRS combinations pre-loaded (WGS84/UTM36S is EPSG:20936, WGS84/UTM36S is EPSG:32736). Can you just use the built-in reproject layer tool? – csk Jun 10 '19 at 19:45
  • The way QGIS do the transformation is not the best. I am working in Malawi and the default transformation parameters give misplacements of 20 to 40 m. This is why I ask a very reliable local surveyor to provide the local parameters or the area of interest. – rsuarez1 Jun 11 '19 at 8:42

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