GLIDER

http://miningsolutions.itsc.uah.edu/glider/

Installing GLIDER

• Using Instructions on GLIDER web page install GLIDER and create a short cut on your desk top

• Go here : C:\Documents and Settings\sundar\Desktop\GLIDER-3.0\GliderWin32_v3.0b and create a subdirectory called data

• Download MODIS Level 1 data files under data directory

Importing File in GLIDER

• Under Default Project > Right Click > Import > file System > Browse and select the HDF file that you placed in the GLIDER data directory.

• Note that when selecting the file you must make sure that the check box is marked

Import

• Once you’ve imported the MODIS level 1B file you should see the file in your Default Project.

• Right click on the hdf file and select Covert to gld file. You get a window that says operation in progress. This takes a few seconds/minutes depending upon your computer.

• Once this is complete you should see the .gld file right below the hdf file in the Default Project in the main GLIDER window.

• You are now ready to explore GLIDER functionalities

Display Image

• Right Click on the gld file and select open image view. You should now see your image

• Click on Display > Channel Editor and you should see this

RGB Display

• You can now pick any combination for RGB and display image in color composites

• Try Red : 0.645um, Mark Equalize, Green : 0.858 um Equalize, Blue : 11.03 um, mark Equalize and Flip

• Equalize is a image enhancement technique called histogram equalization and flip inverts the infrared channel to make clouds look brighter than the surface.

• See next page for what your enhanced RGB image should look like

RGB

2D scatter plot• Try Tools > Image Analysis > 2D scatter plot > Region of

interest and select a small box over the smoke plume in yellow

• You should see scatter plot in Gray scale for the 3 different band combinations.

• 2D scatter plots allows one to examine the spectral response of the various classes.

Spectral Profiles

• Try Tools > Image Analysis> Profile > Spectral• You can examine the spectral features in reflectance

or temperature scale for any point that you pick. Pick a point on the smoke aerosol plume.

Other features

• While this exercise has focused mainly on Image Display GLIDER has many other features. Click on Window > Earth View and you should be able to look at the RGB image in Google Earth type format with several layers

• See next page for the image

Earth View Display

Other GLIDER features

• GLIDER is a comprehensive tool for image analysis, classification and data mining.

• Explore the various aspects of GLIDER • More importantly, it’s free!• http://miningsolutions.itsc.uah.edu/glider/

Volcanic Ash

• R:0.645 um, G : 0.858um, B : 0.469 um (All channels equalized)

Volcanic Ash

• R:0.645 um, G : 0.858um, B : 11.03 um (All channels equalized, B channel also flipped)