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Adapted from: Dekker et al. (2005) & Gullstrom et al. (2006)
Presented by:
Fiddy Semba Prasetiya
Introduction
Seagrass as one of the important
coastal resources:
- Highly productive ecosystem
- Important physical and
ecological function
Threats on seagrass ecosystem:
- Natural disaster
- Anthrophogenic pressure
Monitoring is needed..
Remote sensing as an option
Remote sensing on seagrass
Why remote sensing:
 Cover large area
 Better spectral resolution
 Cost effective
Basic principle in remote
sensing on seagrass habitat
Potential difficulties:
 Resolution and patchiness
 Attenuation by pure water
 Spectral scattering and
absorption by phytoplankton,
SOM/SiOM, DOM
Satellite used in Seagrass mapping
Characteristic/Satellite Landsat MSS (1-3) Landsat TM (5) Landsat ETM (7)
• Operational date
• Band
• Spatial resolution
• Swath width
• Repeat coverage
interval
• Altitude
• Inclination
Since 1972
4
68 m x 80 m
185 km
16-18 days
917 km
99.2°
1984
7
30 m x 30 m
185 km
16 days
705 km
98.2°
1999
7
30 m x 30 m
185 km
16 days (233orbit)
705 km
98.2°
Objective:
To investigate the possibility of using satellite remote
sensing technique for assessment spatial and temporal
dynamics of Submerged Aquatic Vegetation (SAV)
Case study: Wallis lake & Chwaka bay
Benthic substrate
classification/Submerged Aquatic
Vegetation (SAV) using Landsat 5&7:
 Change detection analysis done
(1988-2003) using archived Landsat
data
Chwaka bay Wallis lake
Methodology
Measuring the spectral
characterization of seagrass and
macroalgae species, focusing on:
 Estimating the optical properties of
water column by profiling
downwelling&upwelling irradiance
by RAMSES spectroradiometer
 Estimating the optical properties of
substrate vegetation (also by
RAMSES spectroradiometer )
Measuring the spectral
characterization of waters:
 In situ samples for
spectrophotometric measurement
of the phytoplankton and CDOM
absorption
Changes in seagrass cover in Wallis lake
Changes in substrate cover from
1988-2002 for Zostera, Posidonia
and Ruppia/Halopila
= loss = gain = no change
Changes SAV in Chwaka bay
Changes in SAV distribution
between 1987-2003
Colours represent change and
unchanged areas:
Bare sediment to SAV (yellow)
SAV to bare sediment (orange)
Unchanged SAV (green)
Unchanged bare sediment (brown)
Positive correlation between pairs
of images in different years
Conclussions
Remote sensing can be used as an effective and
cost efficient monitoring tools:
Future trends
Good resolution and accuracy (up to 70%)
More objective and repeatable
Challenges
Advance techniques in discriminating
seagrass species and macroalgae
Satellite sensor data with higher spatial
resolution, better signal to noise ratio
Enhancement on multispectral and
hyperspectral data
Higher radiometric sensitivity of Landsat
sensor for better accuracy (at ´pixel to pixel´
instead of at group pixel scale)
Monitoring on water quality recomended

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Assessment sg detection by remote sensing

  • 1. Adapted from: Dekker et al. (2005) & Gullstrom et al. (2006) Presented by: Fiddy Semba Prasetiya
  • 2. Introduction Seagrass as one of the important coastal resources: - Highly productive ecosystem - Important physical and ecological function Threats on seagrass ecosystem: - Natural disaster - Anthrophogenic pressure Monitoring is needed.. Remote sensing as an option
  • 3. Remote sensing on seagrass Why remote sensing:  Cover large area  Better spectral resolution  Cost effective Basic principle in remote sensing on seagrass habitat Potential difficulties:  Resolution and patchiness  Attenuation by pure water  Spectral scattering and absorption by phytoplankton, SOM/SiOM, DOM
  • 4. Satellite used in Seagrass mapping Characteristic/Satellite Landsat MSS (1-3) Landsat TM (5) Landsat ETM (7) • Operational date • Band • Spatial resolution • Swath width • Repeat coverage interval • Altitude • Inclination Since 1972 4 68 m x 80 m 185 km 16-18 days 917 km 99.2° 1984 7 30 m x 30 m 185 km 16 days 705 km 98.2° 1999 7 30 m x 30 m 185 km 16 days (233orbit) 705 km 98.2° Objective: To investigate the possibility of using satellite remote sensing technique for assessment spatial and temporal dynamics of Submerged Aquatic Vegetation (SAV)
  • 5. Case study: Wallis lake & Chwaka bay Benthic substrate classification/Submerged Aquatic Vegetation (SAV) using Landsat 5&7:  Change detection analysis done (1988-2003) using archived Landsat data Chwaka bay Wallis lake
  • 6. Methodology Measuring the spectral characterization of seagrass and macroalgae species, focusing on:  Estimating the optical properties of water column by profiling downwelling&upwelling irradiance by RAMSES spectroradiometer  Estimating the optical properties of substrate vegetation (also by RAMSES spectroradiometer ) Measuring the spectral characterization of waters:  In situ samples for spectrophotometric measurement of the phytoplankton and CDOM absorption
  • 7. Changes in seagrass cover in Wallis lake Changes in substrate cover from 1988-2002 for Zostera, Posidonia and Ruppia/Halopila = loss = gain = no change
  • 8. Changes SAV in Chwaka bay Changes in SAV distribution between 1987-2003 Colours represent change and unchanged areas: Bare sediment to SAV (yellow) SAV to bare sediment (orange) Unchanged SAV (green) Unchanged bare sediment (brown) Positive correlation between pairs of images in different years
  • 9. Conclussions Remote sensing can be used as an effective and cost efficient monitoring tools: Future trends Good resolution and accuracy (up to 70%) More objective and repeatable
  • 10. Challenges Advance techniques in discriminating seagrass species and macroalgae Satellite sensor data with higher spatial resolution, better signal to noise ratio Enhancement on multispectral and hyperspectral data Higher radiometric sensitivity of Landsat sensor for better accuracy (at ´pixel to pixel´ instead of at group pixel scale) Monitoring on water quality recomended