Post on 31-Dec-2015
description
REMOTE SENSING DATA
Markus Törmä
Institute of Photogrammetry and Remote Sensing
Helsinki University of Technology
Markus.Torma@hut.fi
ROLE OF REMOTE SENSING
• Inventory of larger areas
Determination of surface properties
Determination of surface topography
• Monitoring environmental change
• Visualization
SATELLITE IMAGESLandsat• Enhance Thematic Mapper 29.1.1999• Thematic Mapper 1.9.1990• MultiSpectral Scanner 12.7.1983 and 27.6.1975
Quickbird• 15.7.2003
CORONA• 3 images taken 28.6.1966 and 22.1.1967
LANDSAT ETM• Image size 185 x 185 km2
• 6 visual and near-infrared channels (spatial resolution30m)
1. 0.45 - 0.52 m
2. 0.52 - 0.60 m
3. 0.63 - 0.69 m
4. 0.76 - 0.90 m
5. 1.55 - 1.75 m
7. 2.08 - 2.35 m
• Channel 6 thermal infrared: 10.4 - 12.5 m (60m)
• Panchromatic channel: 0.50 - 0.90 m (15m)
• Channels can be combined to form color images: true color (RGB: 321) and false color (RGB 741)
• Effect of spatial resolution: detail from panchromatic (15m) and color image (30m)
LANDSAT TM• Similar than ETM
• ETM 741 29.1.1999 vs. TM 741 1.9.1990
LANDSAT MSS• 4 channels
• MSS 12.7.1983 and MSS 27.6.1975
LANDSAT• Sandy soils: ch7 / ch1
• Sandy soils 1.9.1990, sandy soils 29.1.1990 and change image (Red: more sand in 1999, green: more sand in 1990)
NOTE: Images have been taken during different seasons, therefore the change can be due to seasonal effects like changing soil moisture
LANDSAT• Satellite image as base map
• Landsat ETM pan and archaeological sites
Colours:Red: Stone cairn (s) / tumulus / tumuliBlue: Shepherd´s / hunter´s rock shelter Bright green: Stone heap(s) / Muslim grave(s)Beige: Abandoned Bedouin camp / tentOrange: Open accumulated pottery sherd concentrationPink: Rectangular structure
QUICKBIRD• 4 channels (blue, green, red, NIR, 2.44m), PAN 0.61m
• Image size 16.5 x 16.5 km2
CORONA• Panchromatic film which is digitized
• Image size 188 x 14 km2 on the ground
• Spatial resolution 2m in the best case
DIGITAL ELEVATION MODELS
STRM-DEM• Shuttle Radar Topography Mapping mission 2000• Based on SAR interferometry• 30m pixel DEM covers area partially
Provided by DLR• 90m pixel DEM whole area
ASTER-DEM• Optical ASTER-instrument in Terra satellite• 30m pixel
DIGITAL ELEVATION MODELS• Areal coverage of
different DEMs
• Red: SRTM-DEM, 30m pixel
• Green and Blue: ASTER-DEM, 30m pixel
• Other areas: SRTM-DEM, 90m pixel
VISUALIZATION• Unsupervised classification of ETM + DEM
VISUALIZATION• MSS 1983 + SRTM-
DEM 90m
FREE DATAGlobal Land Cover Facility• University of Maryland• http://glcf.umiacs.umd.edu/• Landsat ETM, TM, and MSS images• SRTM-DEM 90m
Earth Observing System data Gateway• United States Geological Survey• http://edcimswww.cr.usgs.gov/pub/imswelcome/• ASTER-DEM