Bureau Waardenburg
Varkensmarkt 9
4101 CK Culemborg
the Netherlands
T: +31 (0) 345 512710
email buwa

Vegetatiekarteringen op basis van luchtfoto-interpretatie
Your location:

Vegetation mapping using aerial photographs

Under the framework of the Dutch national monitoring programme (MWTL) the vegetation of tidal areas are surveyed every five years. The governemental body responsible for monitoring (Data-ICT-Dienst, Rijkswaterstaat) uses the data from the monitoring program to evaluate and inform the management of these areas.

Vegetation mapping includes the following components:

  • Interpretation of 'false colour' aerial images. 3D photo analysis uses a Digital Photogrammetry System (DFS; Summit Evolution).
  • Image characteristics are classified through vegetation surveys in the field. Vegetation types are clissified according to Dijkema & Bossinade (Salt08).
  • Classification and re-interpretation of the images according to Salt08 classification.
  • Reporting and mapping consists of creating a number of maps. These consist of maps showing vegetation, structure, habitat type, Red List species, Water Framework maps. Maps are accompanied by explanations and interpretations.

Bureau Waardenburg regularly carries out vegetation mapping using remote techniques.

1. Interpretation of aerial images using the DFS method

During the interpretation of aerial images false colour is often used. The aerial images  are prepared ready for loading into the Digital Photogrammetric Metric System (DFS). Interpretation uses the old-limits method (Janssen & Van Gennip, 2000). According to this method, the limits of the previous mapping are used as a starting point and are subject to change only when clear changes are visible.

Aerial images are analysed on-screen using the Summit Evolution program that is based on colour, structure, texture, shape and relief. The digital files are developed in ArcGIS.

2. Fieldwork

In the field use is made of background maps that are spatially referenced. Each area related to a unique ID and data are added using handheld computers. The coverage and species present are recorded. The SALT-typology (SALT08) is used. In addition vegetation is recorded on the (adapted) Braun-Blanquet scale (average ca. 5 per type).

3. Classification and vegetation

Data are entered in Turboveg and controls are carried out. Tables are presented for  each saltmarsh zone.

4. Re-analysis

Descriptions are translated into vegetation types with values for cover. Data are organised by progression of pioneer zones. Each area is assigned a code consisting of landscape zone and a serial number. From this, vegetation maps are produced for red list species, habitat types, Water Framework Directive species, vegetation structure and TMAP vegetation.

5. Mapping and reporting

The resulting maps are presented in a report, in which the vegetation maps form an important component.

Files are delivered via the RWS Geodatabase, (Mapviewer via internet). Standard ArcGIS functionality, such as exporting to shapefile are available in the Geodatabase ensuring that anyone with access to ArcGIS can analyse the files.

Contact person: