Image Display and Enhancement using ENVI 5.2

Prof. P. Lewis & Dr. M. Disney

Remote Sensing Unit

Dept. Geography

UCL

Aims

After completing this practical, you should have a reasonable idea of a range of basic functions within an image processing software, envi. You should also have started to make some sense of how the theory you are learning in the lectures can be used to manipulate image data.

Introduction

The purpose of this practical is for you to gain experience in image display and enhancement of EO data. The session will be normally run as two two hour supervised practical. You may not complete all tasks in detail in that time, so once you get the hang of how to use the tool, move on to the next section and return later to think more about the remote sensing.

If you are doing this exercise in the departmental UNIX lab, you will be using a UNIX workstation, and may find knowledge of some basic UNnix useful. These notes are not intended to be a comprehensive introduction to ENVI functionality. They serve as an introduction to remote sensing and image processing, presuming no prior knowedge. Further information on envi tools and fuctions can be found in the on-line help pages.



In [5]:

    
# Some setup items for these notes
try:
  %install_ext https://raw.github.com/ebellm/ipython-idlmagic/master/idlmagic.py
  %reload_ext idlmagic
except:
  !pip install --upgrade pidly
  %install_ext https://raw.github.com/ebellm/ipython-idlmagic/master/idlmagic.py
  %reload_ext idlmagic
# Test IDL  
%idl print, findgen(5)









    



Installed idlmagic.py. To use it, type:
  %load_ext idlmagic






    





      0.00000      1.00000      2.00000      3.00000      4.00000



In [8]:

    
%%bash

envi









    



bash: line 2: envi: command not found



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