>> GIS - Remote Sensing; Imagery
Thread views: 2310 View all threadsNext thread*Threaded Mode

(Stranger )
10/07/12 06:47 PM
hyperspectral data Report this article as Inappropriate to us !!!Login to Reply

Hyperspectral images contain many information from nearly 100 spectral bands.

The image cube  is referred to the representation of hyperspectral data as a three-dimensional figure, with two dimensions formed by the x and y axes of the usual map or image displayand the third (z) formed by the accumulation of spectral data as additional bands are superimposed on each other. So how is the pixel value realted to all this?


And what is meant by literally feature extraction?Do we get their pixel values?

10/11/12 09:16 AM
Re: hyperspectral data new [re: new_comer]Report this article as Inappropriate to us !!!Login to Reply

With 24 bit color, there are 3 bands:  blue, green, and red.  Vivid yellow is (B=0,G=255,R=255).  Vivid white is (B=255,G=255,R=255).  The pixel value can be the entire vector or one value in a specific band.     

With Landsat TM, there are 3 bands of visible, then 3 bands of infrared, then a thermal band as well. 

With hyperspectral imagery, there are many bands. 

Feature extraction can be done by unsupervised classification.  You might look for water by looking for all the pixels that are high in the blue channels and low in the red channels and above.  Then you might separate out specific streams or lakes. 

It can also be done just by digitizing the imagery -- click with a mouse or other digitizer to get a mountain ridge, road, or other feature.


View all threadsNext thread*Threaded Mode
Jump to


Teledyne Optech
Teledyne: - Countless CAD add-ons, plug-ins and more.

Internet Business Systems © 2017 Internet Business Systems, Inc.
595 Millich Dr., Suite 216, Campbell, CA 95008
+1 (408)-337-6870 — Contact Us, or visit our other sites:
AECCafe - Architectural Design and Engineering EDACafe - Electronic Design Automation TechJobsCafe - Technical Jobs and Resumes  MCADCafe - Mechanical Design and Engineering ShareCG - Share Computer Graphic (CG) Animation, 3D Art and 3D Models
  Privacy Policy