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Exercise #4 - Ground Truth Data Collection:
1. Online resources
2. Field work
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.
• Most common reasons for conducting field activities
are;
– select training sites prior to supervised classification
– identify key classes after unsupervised classification.
• 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.
Right mouse clickon map and choose‘save picture as’
Latitude 34.1024Longitude -117.7227
mapslive.com
itouchmap.com
Go to Terraserver website
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
Right Click and choose ‘Save image as’
Sample Table
Sample Pictures
GPS apps
longitude latitude
-117.824478 34.0581
Can send files to yourself
GPS appsNice pics
GPS appsEmail coordinates plus map
Latitude: 34.058244 Longitude: -117.824593Map url