Dealing with image data

Class 9: Dealing with image data for product appearance monitoring (04 November)

<pdfreflow> class_date = 04 November 2011 [19 Mb] button_label = Create my projector slides! show_page_layout = 1 show_frame_option = 1 pdf_file = lvm-class-9.pdf </pdfreflow>

MACCMIA exercise

Background

If you have MATLAB, please download and install MACCMIA for to complete the questions below.

• Data file: a 7-channel Landsat image of Washington D.C. and the corresponding Google map.
  • The image is a 1024 x 1026 x 7 cube, using 7.3 Mb of storage
  • Channel 1 = blue/green [450 to 520 nm]
  • Channel 2 = mainly green [520 to 600 nm]
  • Channel 3 = red [ 630 to 690 nm]
  • Channel 4 = Near infrared [760 to 900 nm]
  • Channel 5 = Moisture and vegetation sensitive mid infrared [1550 to 1750 nm]
  • Channel 6 = Thermal infrared [10400 to 12500 nm]
  • Channel 7 = Mineral-sensitive mid infrared [2085 to 2350 nm]

• You can read more about the Landsat program

Questions

1. Identify some water pixels from the Potomac river in the score plot. Where are they located?
2. Mask these water pixels to highlight the entire river. Notice how you have to adjust the mask to get both the shallow and the deep water pixels.
3. Notice how the pixels from half of the Georgetown Reservoir show up with the river's pixels, and the other half show up entirely different.