German Niedersachsen Elevation Models

File:Niedersachsen-Coverage.png

Coverage of the DTM (DGM). Image credit: HVBG.

File:Niedersachsen-DGM.png

Niedersachsen Elevation Model (DGM)

Introduction

The elevation model for the German Bundesland of Niedersachsen (Lower Saxony) is a digital terrain model produced from data originally obtained from the open geodata of Niedersachsen. The source data is produced by 3D airborne laser scanning - with at least 4 points per square-meter. It is delivered by the Landesamt für Geoinformation and Landesvermessung Niedersachsen (LGLN). Three elevation models are delivered with windPRO: 1m, 5m and 20m grid resolutions. The original models are available at a maximum resolution of 1m, however, the highest resolution model in windPRO version is also resampled by EMD to obtain a slightly coarser resolutions - 5m and 20m. This is done in order for the data to be operational for the larger domains needed in the context of wind farm analysis’ and wind flow modelling. The 1m grid resolution data is intended for photomontage modelling. Data made available by EMD represents the data status of June 2024.

Dataset Overview

• Spatial Coverage: Bundesland of Niedersachsen (Lower Saxony)
• Resolution: 1m, 5m and 20m (in windPRO)
• Data-type: Digital Terrain Model (DTM)
• Coordinate system
  • Horizontal: ETRS89/UTM32 (EPSG 25832)
  • Vertical: EPSG 7837 (DHHN2016 mit Normalhöhen-Null (NHN))
• Version: Data were downloaded in June 2024. Data originates from years 2009-2020, dependent on area (see map to the right).
• Accuracy:
  • Vertical: For the 1m resolution dataset the vertical accuracy is stated to be ±0.15m for flat to slightly sloping terrain and ±0.30m for steep slopes with dense vegetation. For the 5m and 20m data we do not have any vertical accuracy records, but likely it is in the same magnitude as for the Hessen Data (±1.1m and ±5.1m respectively for 5m and 20m grid resolutions).
  • Horizontal: N/A