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UTM 27 for a Zambian countrywide projection

Question asked by oliver_burdgis on Jun 25, 2019
Latest reply on Jun 26, 2019 by oliver_burdgis

I'm working on some data from Zambia and some surveyors reports and data have come back with the odd projection of UTM 27. UTM 27 in the standard UTM system would be used for data in the middle of the Atlantic. Zambia looks like UTM 35S would be more suitable.

On further investigation I found this Masters Thesis which states:

"The common practice, in GIS, of using UTM system with longitude 27o east as central meridian for country-wide mapping is not supported by any scientific study with regards to the inherent errors and possible corrections."

This would explain where the UTM 27 reference is coming from.

Would using Arc50 UTM35S and modifying the central meridian property be a way to achieve this projection or does anyone know where I can find a complete specification?