Coordinate systems in Albania: KRGJSH, UTM and the Gauss-Krüger legacy

A good share of the problems in topographic deliverables do not arise from field measurement, but from a later and invisible step: the coordinates are in one system while the project expects them in another. The result is a systematic shift that can be a few metres or a few hundred, and that is usually discovered very late.

Three families you meet every day

The first is WGS84, the global GPS system, with longitude and latitude. It is suitable for positioning and maps, unsuitable for measuring lengths and areas because it is not flat. The second is the flat projections: UTM Zone 34N for most of the country and KRGJSH-2010 as the official state system. The third is the legacy: Gauss-Krüger on Pulkovo 1942, in which many old maps and documents still exist.

Why shifting the coordinates is not enough

Converting between systems is not subtracting numbers. The old systems rest on a different ellipsoid and have a different origin; a proper transformation is required. Improvised approximations "with a constant" work in a small area and start to go wrong as soon as you move away from it — precisely the behaviour that makes the error hard to catch.

The practical rule

Define the project system at the start, write it on every deliverable and do not change it along the way. When you receive data from third parties — DEM, contours, property boundaries — check the projection before merging them with your own. A single wrong layer is enough to spoil the whole model.

How AlbGIS helps

• Coordinate Transformation — conversion between WGS84, UTM 34N, SKREF99 and Gauss-Krüger, with CSV batch and an interactive map.
• DEM to Contours — terrain model processing and DXF export in the system you need.
• GeoPortal — browsing of map layers to quickly verify whether the data falls in the right place.