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The Use of Landsat 8 for Monitoring of Fresh and Coastal Water
By Javier A. Concha Presented in Universidad de Concepción, 01-‐10-‐14
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS ?
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – MoJvaJon – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Remote Sensing (Percepción Remota)
• “The field of study associated with extracJng informaJon about an object without coming into physical contact with it” (Scho], 2007)
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Remote Sensing
AcJve
Passive
* Wikipedia
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Radiance, Reflectance and Atmospheric CorrecJon
Radiance, L
Reflectance, R
Sca]ering
• Radiance: radiaJon reflected by a surface and falls within a given solid angle in specific direcJon*
• Reflectance: fracJon of incident electromagneJc power that is reflected at an interface*
• Atmospheric Correc4on: process of removing the atmospheric effects* *definiJons: Wikipedia **figure: h]p://www.pancroma.com/Landsat%20Top%20of%20Atmosphere%20Reflectance.html
**
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Atmospheric CorrecJon (con’t)
*h]p://geosphere.gsapubs.org/content/2/4/236.figures-‐only
Radiance, L Reflectance, R
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Empirical Line Method (ELM) • Two pixels in the
scenes with known reflectance
• Linear relaJonship between radiance L and reflectance R
• Conversion pixel by pixel
* Smith and Milton, 1999
Offset
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Water OpJcal ClassificaJon
• Case 1 Water: – Open Ocean – Chlorophyll is the main driver
• Case 2 Water: – Inland and Coastal Waters – OpJcally complex – Significant levels of:
• Chlorophyll-‐a • Suspended Materials • Colored dissolved organic ma=er (CDOM)
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Case 2 Water
*Scho], 2007
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Landsat Program
40+ Years of Global ObservaJons!
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Landsat-‐8 SpecificaJons
• OpJcal Satellite (Passive) • MulJspectral satellite: 4 VIS, 1 NIR, 2 SWIR, 1 PanchromaJc spectral bands
• SpaJal ResoluJon: 15/30/100 m • Temporal ResoluJon: 16 days • Bit depth: 12-‐bits quanJzaJon (4096 levels) • Push broom satellite
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Landsat-‐8 – Spectral Bands
Coastal Band (440 nm)
Cirrus band
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OLI (12-bit)
ETM+ (8-bit)
* Courtesy of Dr. Aaron Gerace
Landsat 8 -‐ QuanJzaJon Landsat-‐7
Landsat-‐8
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ETM+ OLI
• About a factor of 5 improvement in SNR. * Courtesy of Dr. Aaron Gerace
Landsat 8
Landsat-‐8 Landsat-‐7
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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HydroLight
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HydroLight
*Scho], 2007
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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MoJvaJon
• Ocean color satellite (e.g. MODIS, VIRSS, SeaWiFS): global studies
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MoJvaJon SpaJal ResoluJon: 1000 – 250 m
MODIS
30 m Landsat-‐8
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MoJvaJon
• Product not available for medium spaJal resoluJon satellites
• Monitoring the Earth’s fresh water supply: Create a water components product for fresh and coastal water
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Hypothesis
• “The L8 sensor can be uJlized to simultaneously quanJfy the concentraJon of water consJtuents (specifically chlorophyll, suspended solids, and colored dissolved organic ma]er) in fresh and coastal waters.”
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Area of Study
Lake Ontario, Rochester, NY: -‐ Lake Shoreline -‐ Genesse River Plume -‐ Ponds
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Retrieval Process
CD
OM
CHL
CHL=3 SM=4
CDOM=7 Atmosph
eric
Correc4o
n
Retrieval (nonlinear opt. code)
CHL=? SM=?
CDOM=?
Radiance
Reflectance
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DifficulJes
• The signal leaving the water is small in comparison to the signal produced by the atmospheric effects (e.g. sca]ering)
• Few spectral bands (5 bands) to capture all details in the signal leaving the water
• Wider bands than the Ocean color satellite such as MODIS, SeaWiFS
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Atmospheric CorrecJon
• A Model Based Empirical Line Method (ELM) Atmospheric CorrecJon Method – Bright pixel :
• Radiance (Data Spectra): Pseudo Invariant Features (PIF) from L8 image
• Reflectance (Field Spectra): PIF from Landsat reflectance product (CDR)
– Dark pixel: • Radiance (Data Spectra): water ROI from L8 image • Reflectance (Field Spectra): HydroLight (esJmated concentraJon)
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ELM-‐based Atm. CorrecJon Method Pseudo Invariant Features mask
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ELM-‐based Atm. CorrecJon Method Bright Pixel
False color image (red = vegetaJon) City Pixels (Bright px)
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ELM-‐based Atm. CorrecJon Method Bright and Dark Pixels
Field Spectra Reflectance
Data Spectra Radiance
[W/m^2/sr]
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Retrieval Process
CD
OM
CHL
CHL=3 SM=4
CDOM=7 Atmosph
eric
Correc4o
n
Retrieval (nonlinear opt. code)
CHL=? SM=?
CDOM=?
Radiance
Reflectance
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Water Pixels
Water Mask
Water Pixels Unknown ConcentraJons
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Retrieval Process
CD
OM
CHL
CHL=3 SM=4
CDOM=7 Atmosph
eric
Correc4o
n
Retrieval (nonlinear opt. code)
CHL=? SM=?
CDOM=?
Radiance
Reflectance
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LUT: HydroLight
• Case 2: 4-‐component IOP model 1. Pure Water 2. Chlorophyll-‐bearing parJcles 3. CDOM 4. Mineral ParJcles
• Output: Water Leaving Reflectance Curves
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LUT: HydroLight (con’t)
LUT
Known ConcentraJons
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Retrieval Process
CD
OM
CHL
CHL=3 SM=4
CDOM=7 Atmosph
eric
Correc4o
n
Retrieval (nonlinear opt. code)
CHL=? SM=?
CDOM=?
Radiance
Reflectance
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LUT
Non-‐linear OpJmizaJon RouJne
Water Pixels
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Non-‐linear OpJmizaJon RouJne (con’t)
• lsqnonlin in Matlab: Solve nonlinear least-‐squares (nonlinear data-‐fiyng) problems of the form
!!• function f = myfun_mod(x0,f1,f2,f3,LUT,Ytest)!
...!! !f = Ytest-F;!
! Where Ytest: pixel with unknown concentraJon F: esJmated curve from the LUT
!
• It uses a tripolar interpolaJon to esJmate F.
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Retrieval Results
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Ground Truth Collect
• Spring and Summer 2013, 2014: – When Landsat 8 passes over Rochester – Three successful images in 2013
• Data: – Water samples: IOPs and ConcentraJons – Reflectances
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Ground Truth Collect Spectroradiometer
Backsca]ering
Water Samples Water Leaving Reflectance
Lab Analysis
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Lab Measurements Spectrophotometer
IOPs
ConcentraJons
FiltraJon and Spectophotometric Analysis
HydroLight
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Sept 19th Ground Truth Collect
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RIT Ground Truth CollecJon Summary
IOPs ConcentraJons Reflectances Backsca]ering Date Ponds Lake Ponds Lake Ponds Lake Ponds Lake
25-‐Aug ✔ ✗ ✔ ✗ ✗ ✗ ✗ ✗ 19-‐Sep ✔ ✔ ✔ ✔ ✗ ✔ ✔ ✔ 26-‐Sep ✔ ✔ ✔ ✔ ✗ ✔ ✗ ✔
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Future Work
• Include a glint correcJon
• Try in a different water body
• ValidaJon by comparing with products from ocean color satellites
• IntegraJon with Hydrodynamics models
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Take Home Points
• Landsat-‐8 has great potenJal to help in fresh and coastal water quality studies
• Atmospheric correcJon over water is a essenJal step
• HydroLight is a excellent tool but needs specific water characterisJcs
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Outline • DefiniJons
– Remote Sensing – Atmospheric CorrecJon: ELM – Water OpJcal ClassificaJon – Satellite Landsat-‐8 – Physics Model: HydroLight
• Project – Goal – Retrieval Process – Ground Truth Collect – Lab Measurements
• Future Work and Take Home Points • RIT and IEEE-‐GRSS?
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Graduate Study
www.rit.edu/grad
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Our Story – Private university – Founded in 1829 – Large suburban campus – Top 15 largest private
universities in the U.S.
About RIT
Student Body – 17,600 students – 2,900 graduate students – 110 countries represented – 106,000+ alumni
WHATEVER YOUR PASSION, YOU CAN MASTER IT AT RIT.
www.rit.edu/grad
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70+ graduate 6 PhD programs
www.rit.edu/grad
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The World at RIT
PREPARING YOU FOR A GLOBAL SOCIETY BY EXPERIENCING IT. § 1,831 international students on RIT’s main campus § 110 countries represented § 3 international campuses § Real-world business projects for multi-national
firms
www.rit.edu/grad
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Financial Aid and Scholarships
– Scholarships, based on merit – Graduate Assistantships
– Sponsored Research & Fellowships – Student Employment (8,000 campus jobs available)
In 2011-12, RIT provided over $16.5 million
in aid to approximately 2,100 graduate
students
www.rit.edu/grad
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slide 60
IEEE Geoscience and
Remote Sensing Society ( IEEE GRSS )
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Geoscience and Remote Sensing Society
- 425,000 MEMBERS IN 160 COUNTRIES - 160,000 + STUDENT MEMBERS - 38 SOCIETIES AND 7 TECHNICAL COUNCILS REPRESENTING WIDE RANGING IEEE TECHNICAL INTERESTS
IEEE is the largest academic and professional society in the world
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Geoscience and Remote Sensing Society
- ONE OF 38 IEEE SOCIETIES - 3400 MEMBERS IN 94 COUNTRIES - 41 REGIONAL CHAPTERS
IEEE GRSS
(Geoscience and Remote Sensing Society)
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Geoscience and Remote Sensing Society
Earth Science, Imaging Systems and Spatial Analysis à Geoscience and Remote Sensing
● Optical imaging systems ● Hyperspectral imaging systems ● Lidar systems and applications ● Radar altimetry and applications ● Microwave imaging radar systems ● Microwave and mm-wave radiometer systems
● Geospatial information processing and applications in Earth and Planetary systems
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Geoscience and Remote Sensing Society
IEEE GRSS Applications ● Earth’s Environment Monitoring ● Earth’s Biomass Monitoring and Analyses ● Monitoring & Mitigation of Natural Hazards ● Urban Studies/Planning ● Natural Resource Exploration ● Space & Planetary Exploration and Applications ● etc.
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Geoscience and Remote Sensing Society
slide 65
IEEE Geoscience and Remote Sensing Society
IEEE GRSS
Join us !
www.grss-ieee.org
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Landsat 8 – Concepción