Abstract. The Dutch height system, called Normaal Amsterdams Peil (NAP), is
realized purely trough leveling between designated benchmarks. In a cycle of
10 years secondary NAP benchmarks, generally located in buildings and civil
engineering structures, are surveyed to provide actual and reliable heights.
However, leveling campaigns are very labor-intensive and take a lot a of
time, resulting in high costs. Furthermore, the planning of secondary
leveling is based on limited prior knowledge. Instead of yearly leveling of
each bench mark within a region, the strategy could be optimized such that
deforming areas are visited more often and stable areas less. Trends
estimated from historical NAP data could be used, but these provide
insufficient information about stability and reliability of published
heights. Therefore we propose to use a nationwide deformation map derived
from InSAR satellite data to optimize the planning of the secondary leveling
campaigns. By using InSAR deformations combined with information of the NAP
benchmarks such as measurement date, type and location, a planning tool has
been developed. The first targeted leveling of NAP benchmarks using this
tool is planned for 2020.
Common Studies of National Height System in Latvia and Lithuania
