1. Hyperspectral Sensing – Imaging Spectroscopy
Spectral, – 200+ bands
Spatial

2. What is Hyperspectral Sensing?

3. Data Cube – a way to visualize the data
Z = Spectral Bands X Y

4. Multispectral Hyperspectral
Each pixel
Discrete bands
Continuous spectrum
Reflectance
Reflectance
Wavelength
Wavelength

5. Multispectral vs. Hyperspectral Data
Multispectral, e.g., Landsat TM
Hyperspectral, e.g., AVIRIS
Reflectance
Wavelength

6. Diagnostic / identifying characteristics are lost in wide bands
Spectra of two materials with (very) different reflectance and absorption properties.
If sensed with a wide band,
Reflectance
they will have the same response and cannot be discriminated or identified.
Wavelength
Diagnostic / identifying characteristics are lost in wide bands

7. Imaging Spectrometry Concept

8. Analysis of Hyperspectral Data -- Approaches
Wavelength
Reflectance
Direct identification using diagnostic absorption and reflection features
Comparison to laboratory and field measured spectra

9. Crop Identification and Inventory based solely on the spectra

10. Reflectance Spectra of Minerals
Relative Reflectance
Wavelength, μm

11. Mineral Detection and Mapping
Reflectance
Wavelength, μm
Mineral Detection and Mapping

12. Mineral Maps from Hyperspectral Data
True Color Image

13. University of Minnesota, Remote Sensing Lab and Water Resources Center
River Airborne
Hyperspectral Remote
Sensing
1.5 2
2.5 3
3.5 4
4.5 5
5.5
400
500
600
700
800
900
Wavelength (nm)
Reflectance %
Confluence of
Minnesota and
Mississippi
Rivers
University of Minnesota, Remote Sensing Lab and Water Resources Center

15. Satellite Hyperspectral Sensors
Hyperion
On E0-1 (NASA) satellite
220 bands, 0.4 – 2.5 μm
12-bit radiometric resolution
30 m spatial resolution
7.5 km swath (= narrow)

16. Summary
Hyperspectral sensing and analysis provides increased information compared to multispectral data
A fast growing technology - New sensors, new classification algorithms, and new image processing algorithms are being developed
Applications are being developed as the technology develops
Wavelength, μm
Reflectance