1 Aral Sea profile Aral Sea profile 2 5 0 k m 1960 1960 1960 1985 1986 1987 1960 1985 1986 1987 1988 1989 1990 1991 1988 1989 1990 1991 1992 1993 1994 1995 1992 1993 1994 1995 1996 1997 1998 2010 ? 1996 1997 1998 2010 ? Selection of area Selection of area Aral Sea Kzyl-Orda Syrdarya river Ajdarkul lake Cardara water supply reservoir Area of interest 185 km 185 km Dried seabed Salt residuals 24 February 2000 2 April 1999 17 May 1998
7
Embed
Aral Sea profile - FIT Staffwebstaff.fit.ac.cy/eng.ls/Skevi/ACET450/ACET450 Satellite... · 2008-10-28 · 4 Tehran, Iran - QuickBird • Ikonos • Ikonos was launched by SpaceImaging
This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
Transcript
1
Aral Sea profileAral Sea profile
250
km
196019601960 1985 1986 19871960 1985 1986 1987
1988 1989 1990 19911988 1989 1990 1991
1992 1993 1994 19951992 1993 1994 1995
1996 1997 1998 2010 ?1996 1997 1998 2010 ?
Selection of areaSelection of area
Aral Sea
Kzyl-Orda
Syrdarya river
Ajdarkul lake
Cardara water supply reservoir
Area of interest
185
km
185 km
Dried seabed
Salt residuals
24 February 2000
2 April 1999 17 May 1998
2
7 June 2000 4 July 1998
21 August 1998 22 September 1998
3 October 1999 25 November 1998
3
Image ProcessingImage Processing
17 May 2001 4 July 2001
21 August 2001 22 September 2001
False colour: Band 6 (thermal) on Red
Band 4 (near-infrared) on Green
Band 2 (green) on Blue• Landsat• The era of Landsat satellites started in 1973 with
the launch of the first MSS satellite. Since then, the specifications of the Landsat satellites have improved and data from the ETM+ sensor on Landsat 7 provides 15 m panchromatic data and 30 m multispectral data. A huge archive of data is available, making Landsat an ideal and cost-effective choice in change detection applications.
• A single Landsat scene covers app. 185 x 185 km.
• The revisit time is also good, 16 days between acquisitions.
TM AND ETM+ SPECTRAL BANDWIDTHS FOR LANDSAT 7 ETM+
• QuickBird• Featuring the highest spatial resolution of any
commercial remote sensing satellite, QuickBirdoffers 60 cm resolution (panchromatic or pansharpened) and 2.4 m multispectral collected in a wide swath of 16.5 km which means that large areas can be acquired in one image. Prices start from as low as app. 500 US $ for a 5 x 5 km area.
Pan: 0.61 m (nadir) to 0.72 m (25° off-nadir)MS: 2.44 m (nadir) to 2.88 m (25° off-nadir)
Resolution: 11 bitsDigitization 23 meter horizontal (CE90%)Metric Accuracy 16.5 km x 16.5 km at nadirSwath Width 1-3.5 days depending on latitude (30° off-nadir)Revisit Time 93.5 minutesOrbit Time
10:30 a.m. (descending node)Equator Crossing Time
7.1 km/secondSpeed 97.2 degrees, sun-synchronousOrbit Inclination 450 kmOrbit Altitude October 18, 2001Launch Date
QuickBird Characteristics
4
Tehran, Iran -QuickBird
• Ikonos• Ikonos was launched by SpaceImaging in 1999
and was the first commercial satellite in the world to offer very high resolution satellite data. Ikonosoffers spatial resolutions of 1 m panchromatic or pansharpened and 4 m multispectral. Digital elevation models (DEM) can be produced by tilting the camera in the along-flight direction.
Pan: 0.81 m (nadir) to 1.00 m (26° off-nadir)MS: 3.2 m (nadir) to 4.00 m (26° off-nadir)
Resolution: 11 bitsDigitization 12 meter horizontal (CE90%)Metric Accuracy 11 km x 11 km at nadirSwath Width 1.5-3 days depending on latitude Revisit Time 98 minutesOrbit Time
10:30 a.m. (descending node)Equator Crossing Time
7 km/secondSpeed 98.1 degrees, sun-synchronousOrbit Inclination 681 kmOrbit Altitude September 24, 1999Launch Date
Ikonos Characteristics
Airport -Frankfurt Ikonos
SPOTVarious SPOT sensors are currently in orbit with spatial resolutions from 20 m down to 2.5 metres. The SPOT
archive dates back to 1986 when SPOT-1 was launched and this makes SPOT an ideal solution for time series
analysis. Like QuickBird and Ikonos, the SPOT satellite can be programmed to acquire new images from any
False colour composite:Red: SWIR band; Green: NIR band; Blue: Red band. In this display scheme, vegetation appears in shades of green. Bare soils and clearcutareas appear purplish or magenta.The patch of bright red area on the left is the location of active fires. A smoke plume originating from the active fire site appears faint bluish in colour.
7
False colour composite:Red: NIR band; Green: Red band; Blue: Green band. Vegetation appears in shades of red.The smoke plume appears bright bluish white. 2 bit image