Coordinate system and fixed point data
Coordinate and fixed point data ensure the accuracy of measurements and design. The municipality's official systems, ETRS-GK25 and N2000, as well as the fixed point network, provide a reliable basis for surveying and construction work.
Tuusula landmarks
Transformation parameters for plane coordinates
Conversion of plane coordinates Tuusula VVJ ↔ ETRS-GK25
In 2012, a new plane control point network was measured in the municipality of Tuusula, and at the same time, the conversion parameters between the Tuusula VVJ (truncated coordinates) ↔ ETRS-GK24 coordinate systems were determined. The mean error of the conversion is ±0.0285 m.
VVJ coordinates are first converted to the ETRS-GK24 coordinate system and then to the ETRS-GK25 grid.
VVJ2 → GK24
- N transfer: 5,999,855.1428 m
- E-transfer: 23999836.7647 m
- a-factor: 0.999993904224213
- b-factor: -0.000014349387763
- Rotation: -6.1 cc
- Scale: 0.9999939
- Scale difference: -9.1 ppm
GK24 → VVJ2
- N transfer: -5999547.3284 m
- E-transfer: -24000069.1536 m
- a-factor: 1.000006095607030
- b-factor: 0.000014349562702
- Displacement: 6.1 cc
- Scale: 1.0000061
- Scale difference: 9.1 ppm
Height system conversion parameters
Conversion of N43 heights to N2000 heights in the Tuusula area
In 2015, a new network of fixed height points was measured in the Tuusula area, and the difference between the N43 and N2000 height systems was determined. These conversion corrections can be used in conversions between height systems.
N43 -> N2000 conversion:
- Overall displacement correction for the entire municipality: +0.320 m (standard error ±7.9 mm)
- More detailed transfer corrections by region:
- Jokela: +0.329 m (standard error ±6.0 mm)
- Other Tuusula (excluding Jokela): +0.318 m (standard error ±7.1 mm)
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