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Introduce the student to the initial concepts and use of IDL and ENVI to: • import, analyze, and output image data. • learn to interface between ENVI input/outputs. This tutorial is designed to introduce you to the basic concepts of the ENVI software and some of its For ENVI +IDL, type envi at the UNIX command prompt. These programs (scripts) are based on the IDL programming language and are run in the IDL environment, either by loading the ENVI+IDL program or simply.

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Excluding the bad bands, the function takes the first derivative of the y value and returns it to the plot window. Note that 1st Derivative will be placed immediately after the Binary Encoding menu option. A value of 1 indicates that the corresponding y-axis value is good, and a value of 0 means it is bad i.

Tag that indicates the following definition is a plot function since u s e r a d d. If you don’t have ENVI then it is a bit harder. Sign up using Email and Password.


Select one or more spectra; the corresponding spectral profiles appear in a Spectral Library Plots window. ENVI calculates the second derivative spectra of all plots and displays the results in the Spectral Library Plots window.

Home Questions Tags Users Unanswered. Using the fourth field above as an example, the format is as follows: Of course for any geospatial work outside IDL you would need to know the nominal pixel size and coordinates of at least 3 control points for image registration.

IDL seems to support reading tif files. Sign up or log in Sign up using Google. This information is often stored in a. The plot function is applied to the data, and the resulting data are returned to the plot window where they are displayed.

ENVI Tutorial

Type of plot function updates. The following steps outline this process. On a Windows platform, this directory is in the following location tuyorial x x indicates the software version: This file contains the following code. V Stuart Foote 5 Then your only issue will be deciding which bands in the array to display, to combine.

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For this tutorial, you will copy a previously edited version of u s e r a d d. By using our site, you acknowledge that you have read and understand our Kdl PolicyPrivacy Policyand our Terms of Service. When you understand how these functions work, close the files.


This applies only to Z Profile windows and will be undefined for irl other plot windows. Yudine, looks like you have every thing you need to read the image into an IDL array. Vector whose values identify the band positions of the bad bands in the Z Profile data.

The following code appears in the IDL Editor: Yudine, should there be an attachement or some details? Not sure it this will help. Vector of ones and zeros with as many elements as x-axis data points. The Open File dialog appears. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

Geological Remote Sensing Group

Email Required, but never shown. ENVI calculates the first derivative spectra of all plots and displays the results in the Spectral Library Plots window. If the plot function is defined without this keyword, then you will likely receive errors when trying to use it tutorkal ENVI.