When the Noordoostpolder was reclaimed, canals, dykes and roads had to be built, among other things. For this, it was important to map the area. Exact positioning was necessary for this.
From measuring chairs or measuring stations in the water, other points in the new polder could be accurately determined. The exact coordinates of the measuring chair were the basis for further measurements. Dredging of waterways was already done before the water was pumped out of the polder by pumping stations. When the swampy ground surfaced, tractors with wide tracks were used. Using a sextant and a seat on the tractor that protruded above the reeds, one could determine the position in relation to the various measuring seats.
The five measurement chairs in the...
When the Noordoostpolder was reclaimed, canals, dykes and roads had to be built, among other things. For this, it was important to map the area. Exact positioning was necessary for this.
From measuring chairs or measuring stations in the water, other points in the new polder could be accurately determined. The exact coordinates of the measuring chair were the basis for further measurements. Dredging of waterways was already done before the water was pumped out of the polder by pumping stations. When the swampy ground surfaced, tractors with wide tracks were used. Using a sextant and a seat on the tractor that protruded above the reeds, one could determine the position in relation to the various measuring seats.
The five measuring chairs in the Noordoostpolder der were all different in shape. To delay rotting away, the wooden poles were treated with boliden salt. After reclamation, they were no longer functional and were removed or left to their fate.
