Quick start & practice
Using Remote Desktop
Navigating the jCube window

There are three ways to use jCube

  • Try jCube on sample LANDSAT image data
  • Downloading more image data directly from the USGS image archive to jCube. (Available soon)
  • Uploading data sets from your computer to the jCube server. (Available soon)

The current version of jCube is a limited capabilities "Beta-testing" release. It runs only one application with LANDSAT images.

Why LANDSAT imagery in particular?
Beta release limitations.

Coming soon: more applications and capabilities


Quick start....

Get the feel of jCube with a practice run demonstrating the use of satellite images to map the inter tidal zone and aquaculture activity.

jCube runs on a remote Server. Start Remote Desktop Connection (don't know what that is?) on your computer. Use the following logon to connect to the jCube server. Note that user name and password are lower case.

User name: jcguest
Password: jcguest

You need a high speed Internet connection to get a reasonable response time to commands and screen views.

jCube is now in a beta release and there are some limitations and restrictions. Only two users can be logged on simultaneously. If you are rejected for login is probably means that there are already two user. Please try again later. Guest sessions are limited to 3 hours. The Server terminates your session when your reach the 3 hour limit or if you are idle for 30 minutes.

When the remote desktop appears Start->Run jCube. The jCube "login" panel pops up and displays for about 5 seconds. The main jCube window pops up next.

jCube window

You are now ready to use jCube to analyze image data.

For a 10 minute exercise do the following....

Select (top right panel) Landsat shorelines
Images (button in right middle panel). A folder browser pops up. Navigate to 'D:/LANDSAT,' then 'LANDSAT L7 Upper GOC 2007 mini set.' Watch the message panel for 'Indexed 5 image bundles.'

Crop. A LANDSAT image of the upper Gulf of California will appear in the image panel area. (See figure below.) Put the mouse pointer on a section of the shoreline at the mouth of the Colorado River. Double click (not too fast, not too slow, moving the mouse very slightly between clicks) to select the spot. A red selection box will appear. This is the 20 km x 20 km area that will be processed.

A sample of 5 images is small for this application (20 is better) and the results will not be stellar. However, this is OK for a quick practice run. The total run time is less than 10 minutes. After this practice try a bigger data set in our sample collection. The bigger data sets are 12 to 24 images and will take 20+ minutes.

GO. This will start processing. The processing for this exercise will take about one minute. (Larger data sets will take several minutes.) Results will pop up in separate windows. Go here for explanation of the output.

After a "GO' you can do Movie and Montage to view the images cropped to your 20x20 km area of interest. The Movie frame speed is slow the first time. Click the Movie button a second time for a faster replay. Montage uses an image contrast enhancement especially designed to emphasize water-land-clouds. Thus Montage is a good view to check that there are few (or better yet, no) clouds in your image time series.

If you just want to see a movie of the image data do Load and then Movie. Load gets the image data for the movie without processing.

Exit. Quit jCube if you a stuck for some reason or just ready to end your session.

The Reserved, Remote and Local buttons are not available.


Contact jCube@jOmegak.com for more information about jCube.
© 2008 jOmegak