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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If the rnvi function is defined without this keyword, then you will likely receive errors when trying to use it in ENVI. This information is often stored in a. The Open File dialog appears. Vector whose values identify the band positions of the bad bands in the Z Profile data.

A value of 1 indicates that the corresponding y-axis value is good, and a value of 0 means it is bad i.

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Note that 1st Derivative will be placed immediately after the Binary Encoding menu option. For this tutorial, you will copy a previously edited version of u s e r a d d. Using the fourth field above as an example, the format is as follows: Yudine 27 1 3. Documents Ressources professionnelles Informatique. Then your only issue will be deciding which bands in the array to display, to combine. The following steps outline this process. Post Your Answer Discard 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.


Yudine, should there be an attachement or some details? This applies only to Z Profile windows and will be undefined for all other plot windows.

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 iddl is a bit harder.

IDL Programming

Excluding the bad bands, the function takes the first derivative of the y value and returns it to the plot window. Vector of ones and zeros with as many elements as x-axis data points.

IDL seems to support reading tif files. On a Windows platform, this directory is in the following location where x x indicates the software version: 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.

ENVI Tutorial – ITT Visual Information Solutions – Informatique

ENVI calculates the first derivative spectra of all plots and displays the results in the Spectral Library Plots window. A read of Michael Todd’s above note with the link to a class exercise at UIdaho should help you with syntax of the code. Voir plus Voir moins. A file selection dialog appears. When you call a user plot function, normal plot data all the spectra in the plot window are passed to the user plot function.


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V Stuart Foote 5 Keyword variable that must be present to receive extra variables that ENVI may need to pass into the plot function. A Spectral Library Input File dialog appears. This function accepts x and y data and a list of bad bands.

ENVI calculates the second derivative spectra of all plots and displays the results in the Spectral Library Plots window. By using our site, you acknowledge that you have read and understand our Cookie PolicyPrivacy Policyand our Terms of Service. This file contains the following code. Data type 2 integer probably The user plot function is applied to every spectrum placed in that window until a different plot function is selected.