1 / 10

Understanding the Electromagnetic Spectrum and Ground Truthing in Remote Sensing

This lesson reviews the Electromagnetic Spectrum (EMS), detailing its various energy bands including visible light, infrared, and radio waves. It explains pixels as the smallest units of digital images, crucial for satellite imagery interpretation. Students compare satellite images with aerial views to identify land cover, using color coding for different features such as vegetation and urban areas. The importance of ground truthing—validating satellite data with field observations—is emphasized. Group activities encourage collaboration and deepen understanding of these concepts.

zelda
Télécharger la présentation

Understanding the Electromagnetic Spectrum and Ground Truthing in Remote Sensing

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Science technologylesson 5

  2. review • Electromagnetic Spectrum (definition): • The range of energy which contains parts or bands: visible light, infrared, ultraviolet, microwave (radar), gamma ray, x-ray and radio. • Different parts of the EM Spectrum have different wavelengths and frequencies.

  3. Review Cont. • Pixels (definition): • The smallest unit of a digital picture. • Satellite images are made up of a matrix of many pixels each with its own value. • Colors represent the reflected light energy.

  4. Ground Truthing – Baltimore, MD

  5. IMAGE INTERPRETATION • Compare this satellite image to the view from an airplane window – write in notebook • List visual clues that help identify different kinds of land cover. • Hint: geometric shapes usually indicate human-made areas. • Image interpretation is the initial stage of land cover mapping • Remember ground truthing is a technique that uses field observations to determine the accuracy of a land cover map made from a satellite image.

  6. Color code to image interpretation • Red: vegetation with high photosynthetic activity (growing grass or trees in full leaf) • Orange: Vegetation that is not currently photosyntheticaly active, lawns • Green: deciduous forest areas • Blue/Purple: concrete, roads, cities, other impervious surfaces • Blue/Black: water • Burnt/Brownish Orange: mix of deciduous trees and lawns; suburban areas

  7. Activity:Ground Truthing • Group work – 6 groups • Pass out worksheets by group • Compare the ground data to their map for the same area and present their findings to the class • Using the satellite image, find other areas with the same spectral signature (i.e. same ground cover) • Do we need to adjust our class definition of Ground Truthing? Look at your definitions.

  8. summarize • Why is ground validation (ground truthing) so important for interpreting satellite imagery?

  9. Venn Diagram Foldable: Evaluate ground truthing & remote Sensing

  10. Questions & Diagram What technology do scientists still need to invent?

More Related