CRSC 6 October 1, 2004 CRSC 6 – Intro to Precision Ag Fall 2004 October 1, 2004

CRSC 6 October 1, 2004 What is Remote Sensing? “The acquisition of information about an object without being in physical contact with it." (Charles Elachi) Value is the Ability to oAcquire a lot of information oIn a very short time oWith minimal labor input

CRSC 6 October 1, 2004 Platforms Done with many different platforms oSatellites oAircraft oMobile Platform

CRSC 6 October 1, 2004 Interaction

CRSC 6 October 1, 2004 Electromagnetic Energy Involves the measurement of electromagnetic energy

CRSC 6 October 1, 2004 Electromagnetic Spectrum

CRSC 6 October 1, 2004 Indices Normalized Difference Vegetation Index (NDVI) o(NIR - VIS)/(NIR + VIS) Calibrated Vegetation Map Enhanced Vegetation Index (EVI) Vegetation Change Map Greenness Index Soil Color Map

CRSC 6 October 1, 2004 Indices

CRSC 6 October 1, 2004 Measures of Performance Spatial Resolution Spectral Response Spectral Resolution Frequency of Coverage

CRSC 6 October 1, 2004 Spatial Resolution The size of the smallest object that can be distinguished in an image.

CRSC 6 October 1, 2004 Spectral Response The ability to respond to radiation measurements within a spectral band.

CRSC 6 October 1, 2004 Spectral Resolution The ability to differentiate between electromagnetic radiation of different wavelengths. Landsat TM image (bands 6-4-2) Alto Image (comparable bands

CRSC 6 October 1, 2004 Frequency of Coverage How often a sensing system is available to collect data.

CRSC 6 October 1, 2004 Other Considerations Timeliness of Provider Cost of Service Projection and Coordinate System Used Ground Truthing