Welcome to the Harris Geospatial product documentation center. Here you will find reference guides, help documents, and product libraries.


Harris Geospatial / Docs Center / Using IDL / Scatterplot

IDL

Scatterplot

Scatterplot

You can create a scatterplot using two bands of image data. Two-dimensional (2D) scatterplots show the range of pixel values in each band, creating a visual way to assess data variance.

The code shown below creates the graphic shown above. You can copy the entire block and paste it into the IDL command line to run it.

; Read in a 2-band image
file = FILE_WHICH('glowing_gas.jpg')
!null = QUERY_IMAGE(file, info)
gas = READ_IMAGE(file)
 
red_band_pixels = REFORM(gas[0,*,*], product(info.dimensions))
green_band_pixels = REFORM(gas[1,*,*], product(info.dimensions))
; Plot red versus green band
s = PLOT(red_band_pixels, green_band_pixels, $
  SYMBOL = 'dot', $
  /SYM_FILLED, $
  SYM_COLOR = 'purple', $
  LINESTYLE = 'none', $
  XTITLE = 'Red band value', $
  YTITLE = 'Green band value', $
  TITLE = 'Red vs. green band of "glowing_gas.jpg"')

Resources




© 2018 Harris Geospatial Solutions, Inc. |  Legal
My Account    |    Store    |    Contact Us