Presentation on theme: "A.H.Muhammad Siddique-E-Akbor Graduate Student, CEE, TTU Surface Water and Ocean Topography (SWOT) Satellite Mission."— Presentation transcript:
A.H.Muhammad Siddique-E-Akbor Graduate Student, CEE, TTU Surface Water and Ocean Topography (SWOT) Satellite Mission
o Introduction o Objectives o Remote Sensing o Instruments o Resolution o Parameter Values of Mission o Data Collection & Processing o Expected Benefits o Expected Application Contents
o Proposed NASA & French Space Agency (CNES) mission to make the first global survey of Earth's surface water. o In February 2008, adopted the name SWOT, replacing the original name WatER HM. Introduction Artists concept of SWOT
Glimpses of the Mission o Launch: 2016 o Agency: NASA & CNES o Orbit: Low Earth Orbit…max 2000km altitude o Estimated Cost: $450 million o Areas of Interest: Climate, Health & Water o Instruments: KaRIN, Ku-band nadir altimeter, microwave radiometer o Mission Life Time: 03 years
oTo observe the fine details (closer spacing) of the ocean's surface topography, and measure how water bodies change over time. oSpatial Resolutions: 10 km, at present the resolution is 300 km. oDischarge measurement in large (50m-100m width) rivers Mission Objectives Northern Alberta Lakes, Canada
Remote Sensing o Wide-swath altimetry technology Designed to acquire high-resolution elevations at spatial and temporal scales Designed to acquire high-resolution elevations at spatial and temporal scales o Active Sensors are a laser florosensor and a synthetic aperture radar (SAR)
Instruments o Ka –or Ku-Band Radar………………….27.5-32GHz o Ku-Band Altimeter (Kurz-unten Band)..12-18 GHz o Microwave Radiometer (MWR)..Ka-Band radar is a new type named Ka-band Radar Interferometry (KaRIN). Wavelength, λ=0.86 cm A conceptual outline of the KaRIN instrument configuration
Resolution o 200 MHz bandwidth o Cross-track ground resolutions o Varying from about 10 m in the far swath to about 60 m in the near swath o A resolution of about 2 m in the along track direction is derived by means of synthetic aperture processing. o Orbit shall be an exact repeat orbit with a maximum repeat period of 22 days.
Parameter Values of Mission o Mass: 150 Kgs o Frequency: 35 GHz o Operating Time/Orbit: 40% o Antenna Length: 4 m o Antenna Width: 0.20 m o Boresight Look angle: 3.5 deg o Baseline Length: 10 m
…Parameter Values of Mission o Orbit Height: 800 km o One-Sided Swath: 50 km o Number of Swaths: 2 o Range Resolution: 0.75 m o Azimuth Resolution: 5 m o Raw Data Rate: 504 Mbits/s o Data Volume/Orbit: 76 Gbytes
…Parameter Values of Mission o Orbit Height: 800 Km o Orbit Type: 22-day repeat 78° inclination o Swath: 120 Km o Frequency: Ka-Band o Wavelength: 0.86 cm o Height Precision: ~1cm @1 km resolution o Spatial Resolution: <100 m imaging o Instrument: Interferometer
Data Collection & Processing o Instrument check (at least 3 months) o Space-Time Sampling o Repeating Period: 22-days o Calibration and Validation Phase o Ensure the required data volume and adequate spatial coverage (3-day sampling) o Verified by an independent measurement or analysis during a post-launch validation period o Sea surface heights (SSH) and terrestrial water heights over a 120 km wide swath with a +/-10 km gap at the nadir track
…Data Collection & Processing o Over the deep oceans, provide SSH within each swath with a posting every 2 km x 2 km, and a precision not to exceed 0.5 cm when averaged over the area. o Over land, download the raw data for ground processing and produce a water mask able to resolve 100-m rivers and 1-km 2 lakes, wetlands, or reservoirs. o Water level elevations with an accuracy of 10 cm and a slope accuracy of 1 cm/1 km. o Cover at least 90% of the globe. o Gaps are not to exceed 10% of Earth's surface. In-situ cannot measure this
Expected Benefits o Improved water management in transboundary river basins o Improved prediction of carbon fluxes to and from wetlands o Improved flood and marine forecasts o Improved identification and forecasts of inundation and malaria zones o Improved prediction of changes of sea level rise. A flooded forest in the Amazon
Expected Application o Ganges-Brahmaputra-Meghna (GBM) River Basin- the flood forecasting range of the lowermost riparian nation is limited due to unavailable rainfall from upstream nations.