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October 8, 2015
GIS Day 2015Geospatial Technologies
• GPS (global positioning system)– Car GPS systems, yield monitors, smart phones
• RS (remote sensing)– Satellite or Aircraft imagery (Including UAS)– Your camera
• GIS (geographic information system)– Combines layers of information– Can include GPS and RS information– Provides analytic tools– ArcGIS, ArcGIS Online, QGIS, GoogleEarth?
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October 8, 2015
What Is Remote Sensing (RS)
Remote sensing is the science of obtaining information about objects or areas from a distance, typically from aircraft or satellites.
- oceanservice.noaa.gov/facts/remotesensing.html
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October 8, 2015
RS Measures Spatial Variations
30 meter or 100 foot pixels 0.3 meter or 1 foot pixels
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October 8, 2015
RS Measures Spectral Variations
Natural Color Color Infrared Red
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October 8, 2015
The Electromagnetic Spectrum
Infrared does not always mean thermal or heat!!!
Landsat 8 spectral range
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October 8, 2015
Reflectance Curves for Some Features
Landsat 812 3 4 5
67 8
34
5
2
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October 8, 2015
RS Measures Temporal Variations
Landsat 5 – July 17, 1986 Landsat 8 – May 24, 2013
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October 8, 2015
Natural Color
Why Does the “Turf” Appear Different forFootball and Baseball Fields In Color IR?
Color Infrared Red
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October 8, 2015
Comparison of Spectral ResponsesResponse from Grass Area
Response from Football Field
Channel numbers in order of blue, green, red, near infrared red
• Notice the difference in channel 4 or the near infrared band
• Use of near infrared was very helpful for camouflage detection during World War II
• Any thoughts on how else these type of response differences can be used?
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October 8, 2015
Measure Distance by Pixels
Distance between linesPixel
Lines 3280 to 3294
Each pixel is 1 foot on a side
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October 8, 2015
Useful Web Site Links• Freeware Application to View Remote Sensing Data
• MultiSpec: Available for Macintosh & Windows platforms• engineering.purdue.edu/~biehl/MultiSpec/
• Web-enabled: mygeohub.org/tools/multispec (will need to register)
• Source for Image Data• IndianaMap: maps.indiana.edu/
• County Landsat Images:• www.indianaview.org/glovis/IN_County_Landsat_Data.html
• Aerial high spatial resolution images: • gis.iu.edu/isdp_dl/map/m10000.html
• Geography Educators’ Network of Indiana (GENI): • www.iupui.edu/~geni/
• AmericaView Earth Observation Day: Oct. 14, 2015• www.americaview.org/earth-observation-day
Contact: Larry Biehl - biehl@purdue.edu
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October 8, 2015
Is Remote Sensing a Science?
From Landsat 7 scene over Garden City, Kansas; 9/1/2000 eros.usgs.gov/imagegallery/earth-art
or an Art?
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