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Exercise #4 - Ground Truth Data Collection: 1. Online resources 2. Field work

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 A ids in interpretation of imagery

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Exercise #4 - Ground Truth Data Collection: 1. Online resources 2. Field work

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  1. Exercise #4 - Ground Truth Data Collection: 1. Online resources2. Field work

  2. 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.

  3. Most common reasons for conducting field activities are; • select training sites prior to supervised classification • identify key classes after unsupervised classification.

  4. 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.

  5. mapslive.com Right mouse click on map and choose ‘save picture as’ Latitude 34.1024 Longitude -117.7227

  6. itouchmap.com

  7. Go to Terraserver website

  8. List of images: Urban Areas 3/29/2004 Aerial Photo 6/1/1994 Topo Map 7/1/1978 Click on info button to get cross hairs

  9. Right Click and choose ‘Save image as’

  10. Sample Table

  11. Sample Pictures

  12. GPS apps Can send files to yourself

  13. GPS apps Nice pics

  14. GPS apps Email coordinates plus map Latitude: 34.058244 Longitude: -117.824593Map url

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