Advanced Satellite Radar Monitoring Agriculture Applications Aart Schrevel Niels Wielaard Dirk Hoekman Syngenta Foundation 11.02.2014
Advanced Satellite Radar Monitoring Agriculture Applications
Aart SchrevelNiels WielaardDirk Hoekman
Syngenta Foundation 11.02.2014
New era in agricultural crop monitoring using (radar) satellites:
• Better information : new satellites with improved information content
• More frequent information : new radar satellites that can see through clouds and haze enabling reliable very frequent ‘time-series’ observations at high detail (every 2-6 days)
• Larger area coverage at high detail : new semi-automated processing techniques area available for analysis and efficient large datasets
• More affordable : 20-30m data available for free
Reliable radar observations can be made every 2-6 days:
• 1- 5m spatial resolution radar : TerraSAR-X/PAZ/CosmoSkymed• 20-30m spatial resolution radar : ASAR, Sentinel-1 Optical: Landsat 8, Sentinel-2
New era in satellite monitoring
What can be monitored using (radar) satellites:
• Which areas are flooded, at what times and for how long?
• Which crop types and which crop varieties are planted where, how many hectares? Based on this, how many hectares of organic crops are planted?
• When and where are soil prepared, what are different growth stages and biomass increase at different times?
• What is the timing and extent of crop damages and losses such as caused by storm damage, droughts and floods?
Satellite monitoring can reduce (or replace) costly and time-consuming ground data collection. It can improve inaccurate statistics.
Historical data availability varies per location
New era in satellite monitoring
Reliable frequent observations: improved identification of crop type and growth stages based on temporal differences
Radar time-series monitoring
Typical optical
satellite image
Cloud free
radar image
Cloud free
radar image
Radar analysis
Bare soil
22/04/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergence
16/05/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrement
09/06/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrementClosure
03/07/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrementClosure
27/07/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrementClosure
20/08/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrementClosure
13/09/2012
Sugar beet at 25m resolution every 24 days
Radar analysis
Bare soilEmergenceIncrementClosureHarvest
07/10/2012
Sugar beet at 25m resolution every 24 days
Rice at 5m resolution every 5-11 days
5m detail suitable for monitoring of small farms
Sharp results: Multi-temporal filtering
Rice at 5m resolution every 5-11 days
Doy 205 Doy 213
Regenbui op dag Doy 212
TerraSAR-X surface soil moisture accuracy 3% (rmse).
Soil moisture at 5m resolution every 5-11 days