Real-Time Sea Ice Detection from Coastal Radars
description
Transcript of Real-Time Sea Ice Detection from Coastal Radars
Real-Time Sea Ice Detection from Coastal Radars
3rd Ice Analyst Workshop Tuomas Niskanen14-18 of June, 2011 Oceanographic ServicesCopenhagen, Denmark Finnish Meteorological Institute
Coastal radars are part of an existing VTS network
VTS = Vessel Traffic Service
20 to 30 non-military fixed coastal radars along the Finnish coast
The radars are designed for observing targets
Movements of ice are noise which is normally filtered out
With an external device, the filtered signal can be processed in order to get movements of ice out
Background
Hailuoto
Tankar
ShipSensorNet project in 2008 Founded by TEKES (Finnish Funding Agency
for Technology and Innovation) External signal capturing device by
ImageSoft Oy Ice movements can be brought out from
processed filtered signal
The external device can be installed into radars Vessels, coastal radar stations, etc.
The technology has been in use RV Aranda Icebreaker Otso Hailuoto, Raahe and Tankar
Background
Coastal radars currently used for sea ice monitoring
BACKGROUNDRadarSat-2 image on 10th of Feb 2011
TANKAR
HAILUOTO
COASTAL RADARS•TERMA 9 Ghz•X-band•Antenna height
• Hailuoto: 30.2 m• Tankar: 37.8 m
1
Satellite SAR Image vs.
Coastal radar Image
Data flow
Image capturing device
Image capturing device
Coastal radar
Image post processing at FMI’s server
Image post processing at FMI’s server
Via 3G mobile
link
Via 3G mobile
link
Ice ServiceIce Service
Scientific databaseScientific database
Future customers
Future customers
AdvantagesSatellite
Strength: covers large area at one pass
Weakness: passes same area once in 1-2 days
Coastal radar Strength: covers certain area every
2 seconds Weakness: maximum coverage
approximately 30 km * 30 km
Advantage of coastal radar images and animations
Useful tool for ice forecasting and charting when there are no satellite images available
RadarSat-2 Image Coastal Radar Image
Area coverage
Ice motion, divergence and rotation determined from consecutive images
IMAGEINTERVAL 2 secSIZE 30 km
ROTATIONred = clocwiseblue = anticlocwise
DIVERGENCEred = closingblue = opening
Coastal radars in operational use at FMI
Today at Finnish Ice Service•Animation is created with 2 minutes interval•Length of animation is 2 days•In daily operational use since Jan 2011•Several other operational and research options
Coastal radars in operational use at FMI
Future plans•More image capturing devices need to be installed
• One will be installed to the Quark for winter 2011-12• In the future a mosaic of several devices?
•Different animations (divergence, rotation)?•Colorization of black-white images?
• can bring out more details from ice field