exercise #4 - ground truth data collection: 1. online resources 2. field work
TRANSCRIPT
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Exercise #4 - Ground Truth Data Collection:
1. Online resources
2. Field work
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Ground Truth
• Jargon term for surface observations.
– On-site gathering of data that characterizes surface
– Aids in interpretation of imagery
• Field observations - in situ spectral measurements, aerial
photography, descriptive reports, and maps.
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• Most common reasons for conducting field activities
are;
– select training sites prior to supervised classification
– identify key classes after unsupervised classification.
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• If logistics or circumstances limit field operations,
then use aerial photography, maps, literature
research, etc.
• In practice, to specify training sites generally means
integrating the following sources of information:
direct observations, photo documentation, a variety
of maps, personal familiarity.
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Right mouse clickon map and choose‘save picture as’
Latitude 34.1024Longitude -117.7227
mapslive.com
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itouchmap.com
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Go to Terraserver website
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List of images: Urban Areas 3/29/2004 Aerial Photo 6/1/1994 Topo Map 7/1/1978
Click on info buttonto get cross hairs
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Right Click and choose ‘Save image as’
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Sample Table
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Sample Pictures
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GPS apps
longitude latitude
-117.824478 34.0581
Can send files to yourself
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GPS appsNice pics
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GPS appsEmail coordinates plus map
Latitude: 34.058244 Longitude: -117.824593Map url
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