Data Knowledge Information

http://virginiaview.cnre.vt.edu/tutorial/Chapter_14_Radiometric%20Enhancement%20of%20Landsat%20Imagery.pdf

GEOMETRIC-TOPOGRAPHIC DISTORTIONS

Ortho satellite images

SRTM (Shuttle Radar Topography Mission)

DNs DNs

Edge DetectionLakes & Streams

Edge DetectionFractures & Shoreline

Edge Detection of Fields

Topeka, Kansas: Color IR composite showing unstretched data

Topeka, Kansas: Color-IR composite showing linear contrast stretch with 2% saturation

IMAGE ENHANCEMENTS

A2D

• Unsupervised classification:

Pixels DN-based classes

Assign names to

classes

Named classes

Training sites

Classified image

Objects identified

Image segmented into blocks

Blocks assigned to

classes

Image segmented into blocks

Objects identified

Blocks assigned to

classes

Changes in rangelandaround Lethbridgefrom 1986 to 2009