Posters

Abstract

The latest LiDAR (Light Detecting and Ranging) data evaluation seems to indicate that the industry standard that minimum verification heights are automatically transferable to targeted higher measurement heights does not seem to be correct for all relevant used cases. In our study, we have shown that from all measurements carried out about 25% show such a significant deviation that a correction is necessary compared to the met mast with increasing heights. This deviation makes a verification for these commonly unverified heights even more important. To achieve accurate measured data, mainly measurement masts have been used so far. These are now increasingly being replaced by LiDAR measurements, which have the advantage of measuring directly at modern hub heights and without vertical gaps. To ensure a precise measurement with LiDAR devices, a pre- and post-verification is carried out on an IEC 61400-12-1 compliant met mast. The verification of a LiDAR device at hub height was so far either uncommon or even impossible due to a lack of available resources such as sufficiently high IEC 61400-12-1 compliant met masts. In the process of data evaluation, it can be observed that certain LiDAR with certain algorithms make particular behaviours more likely. Roughly a quarter of the measurements investigated showed an increasing critical deviation with the height requiring correction. These deviations are not detectable in verifications up to 120m, since the deviation increases significantly at heights above 100m. In addition, within the course of several verifications even with significant changes (maintenance/firmware) to the device, the behaviour of most devices is constant, but for individual devices, a significant temporal drifting over time was detected. The possibility to verify at hub height offers the advantage to avoid possible measurement errors. Here, the study shows that both a pre-verification and a post-verification at sufficient height is necessary.