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Orthophotos and DSMs derived from RPAS flights over the nature reserve Zwin in Flanders, Belgium
Citation
Vanden Borre, Jeroen, Klaas Pauly, Van Hoey, Stijn, De Reu, Jeroen, & Desmet, Peter. (2019). Orthophotos and DSMs derived from RPAS flights over the nature reserve Zwin in Flanders, Belgium [Data set]. Zenodo. https://doi.org/10.5281/zenodo.3096020

Availability: CC0 To the extent possible under law, the person who associated CC0 with this dataset has waived all copyright and related or neighboring rights to this dataset.

Description
Data were collected by the Research Institute for Nature and Forest (INBO) with a fixed wing drone Gatewing X100 in 2014 and 2015 (15 flights). RGB data were acquired using an off-the-shelf Ricoh GR Digital IV camera, with the following image bands: 1: red, 2: green, 3: blue, 4: alpha channel. CIR (color-infrared) data were acquired using a NIR-enabled Ricoh GR Digital IV camera, with the following info bands: 1: NIR, 2: red, 3: green, 4: alpha channel. more

Study area: The Zwin is a nature reserve situated along the Belgian North Sea coast, northeast of Knokke, in the province of West-Flanders, Flanders, Belgium. The area is managed by the Flemish Agency for Nature and Forest and consists of a tidal marsh, coastal dunes with Ammophila arenaria, dune grasslands and/or shrub (Hippophae rhamnoides, Salix repens), and a transitional grassland zone that stretches from the inner edge of the coastal dunes into the polders.
Data processing: The raw data were processed to Digital Surface Models and orthophotos by the Flemish Institute for Technological Research (VITO) in 2017. Images with coarse GPS coordinates were imported and processed in Agisoft PhotoScan Pro 1.4.x, a structure-from-motion (SfM) based photogrammetry software program. After extraction and matching of tie points, a bundle adjustment leads to a sparse point cloud and a refined set of camera position and orientation values. Ground control points (either artificially installed markers on the terrain, or other photo-identifiable points, measured on the ground with RTK GNSS) were used to further refine the camera calibration and obtain a pixel-level georeferencing accuracy. From there, a point cloud densification and classification into ground and non-ground points was performed, leading to a rasterized digital surface model (DSM) and digital terrain model (DTM). Finally, a true orthomosaic was projected onto the DTM.
Coordinate reference system: All geospatial data have the coordinate reference system EPSG:31370 - Belgian Lambert 72.

Scope
Themes:
Physical > Optical measurements
Keywords:
Marine/Coastal, Fresh water, Brackish water, Terrestrial, Drone aircraft, Environment management, Modelling, Orthophotos, Remote sensing, Unmanned aircraft, ANE, Belgium, Zwin

Geographical coverage
ANE, Belgium, Zwin [Marine Regions]

Temporal coverage
2014 - 2015

Parameter
RGB (Red, Green, Blue) colour component means and percentiles

Contributors
Vlaamse overheid; Beleidsdomein Economie, Wetenschap en Innovatie; Vlaamse Instelling voor Technologisch Onderzoek (VITO), moredata creator
Vlaamse overheid; Beleidsdomein Omgeving; Instituut voor Natuur- en Bosonderzoek (INBO), moredata creatordata manager

Dataset status: Completed
Data type: Data
Data origin: Research: field survey
Metadatarecord created: 2021-12-07
Information last updated: 2021-12-07
All data in the Integrated Marine Information System (IMIS) is subject to the VLIZ privacy policy