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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Keyword variable that must be present to receive extra variables that ENVI may need to pass into the plot function.

Not sure it this will help. Sign up using Email and Password. Yudine 27 1 3.

ENVI calculates the second derivative spectra of all plots and displays the results in the Spectral Library Plots window. A file tktorial dialog appears. 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.

A Spectral Library Input File dialog appears.

By clicking “Post Your Answer”, you acknowledge that you have read our updated eenvi of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. The Open File dialog appears. Email Required, but never shown. Yudine, looks like you have every thing you need to read the image into an IDL array.


Introduction to IDL Programming

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. Sign up or log in Sign up using Google. A value of 1 indicates that the corresponding y-axis value is good, and a value of 0 means it is bad i.

The following steps outline this process.

This function accepts x and y data and a list of bad bands. Sign up using Facebook.

If the plot function is defined without this keyword, then you will likely receive errors when tutorkal to use it in ENVI. 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.

Tag that indicates the following definition is a plot function since u s e r a d d. Excluding the bad bands, the function takes the first derivative of the y value and returns it to the plot window. And the byte order is 0, i. When you understand how these functions work, close the files. Data type 2 integer probably Note that 1st Derivative will be placed immediately after the Binary Encoding menu option. Post as a guest Name.


IDL Programming

IDL seems to support reading tif files. The plot function is applied to the data, and the resulting data are returned to the plot window where they are displayed. On a Windows platform, this directory is in the following location where x x indicates the software version: Documents Ressources professionnelles Informatique.

Yudine, should there be an attachement or some details?

When you call a user plot function, normal plot data all the spectra tutroial the plot window are passed to the user plot function. If you don’t have ENVI then it is a bit harder. Vector whose values identify the band positions of the bad bands in the Z Profile data. Type of plot function updates.

ENVI Tutorial

The Spectral Library Viewer dialog appears. This applies only to Z Profile windows and will be undefined for all other plot windows. Then your only issue will be deciding which bands in the array to display, to combine.