MapEO Water

Features

• Data Management: Data access through (Web Map Service) WMS  and (Web Coverage Service) WCS.
• Sensor Measurements: The camera measures radiance over water bodies, expressed in Digital Numbers (DN). MapEO Water converts these into physically meaningful values:
  • Water leaving reflectance
  • Turbidity
  • Total Suspended Matter
  • Chlorophyll-a concentrations
• How it works:
  In the development of the MapEO services some key challenges in application of image technology to characterize water columns had to be overcome, for example:
  • Water bodies often look dark on images.
  • The interaction of the light with the atmosphere just above the water surface plays a major role (sky glint). Luckily, this can be modelled through a modified version of VITO’s atmospheric correction algorithm iCOR (iCOR4Drones).
  • The water surface acts as a mirror (sun glint). Therefore, a well-adapted flight protocol and hardware setup is indispensable.
  • The water column is often a dynamic environment, variations in currents and tides can lead to a rapidly changing scene under investigation.
  These challenges are addressed one by one in a clear processing workflow.

  
  Diagram of MapEO workflow

  

  
   

Specifications

• Resolution: cm-resolution (depending on flight height)
• Dimensions: Drone platform dependent
• Power requirement: Battery
• Method to transmit data: Upload to workflow through FTP server. Data access of processed data through WMS and WCS.
• Deployment method: The system has to collect data according to predefined flight instructions to avoid contamination by sun glint, and enable correction for incoming irradiance.

Publications

Deliverables

• Open Data repositories (D9.3)

  Publication date: Jun 2018 | Lead author: PML

Technical Resources

Technical drawing

Graphical image of the processing workflow that makes up the MapEO water service.