Making A Subset In Erdas Imagine 9.3

Introduction: A typical Landsat scene covers an area of about 185km by 185km.  At times, it makes sense to cut out a subset of this larger image to simplify your analysis and focus on the portion of the scene that is of primary interest. This is quite easy.

Procedure:  Start ERDAS Imagine. Select Viewer Type dialog box will open up.  Select the Classic Viewer and click OK.  In the Viewer window, go toFile-Open-Raster layer and select the image that you want to subset.

Three methods are available:

– Coordinates. Define the coordinates of upper left and lower right corners of a box

– Enquire box. Open the image to subset in viewer. Select the area to subset using an enquire box (Utility 􀃆 Enquire box) then click on enquire box. Move the box and enlarge it to include the area you want to clip.

– AOI (Area Of Interest). More complex shapes to be selected by using the AOI option once an input file has been defined

– To create an AOI open the image to subset in viewer, and draw a closed loop AOI (AOI 􀃆 Tools) using the create rectangle or polygon AOI tool. Save the AOI as an AOI layer.

In the Viewer window, go to Utility-Layer Info to see how many bands are in the image and decide which bands you want to include in your subset.

From the main ERDAS Imagine toolbar, Select Data Prep-Subset Image

HOW TO: Get Notified When Someone Login To Your Face-book

Recently Facebook  introduces a tool in their official blog, that notifies you when someone logins to your Facebook account by sending you a email or SMS text messaging . This tool will give you an idea when or from where your Facebook account logins and also helps you in recognizing when a hacker has broken your security.

So, You can quickly take an action on this by changing your accounts password or by contacting Facebook .

Once you enables this notifications tool you will be required to identify each device or computer from where you access your Facebook account. You will be able to get list of machines from where you account is accessed and of course no one can access you account without filling this security check .

So, Here is a tutorial how to activates this  feature!

STEP 1: Log in to your account & Open Account Settings:-

First sign in to your account and click the  ”Account” word in the top right corner of the browser window. A drop-down menu of options will displayed, then click on “Account Settings,” as pictured below.

Account Settings

Now , Scroll down your setting page until you see “Account Settings” and press the button which below this option.

Click Image for Zoom

Check “Yes” when you see the prompt, “Would you like to receive notifications for logins from new devices?” Then click “Save.” The feature is turned on. Now check your security!

Step 2: Login & Identify Your Computer:-

Now, login again to your account and this time you will see a register your computer page, as a pictured below.

Register Your computer

Now, Enter’s Your computer name and check the box “Don’t Ask Me Again From This Computer” if you are not using on public computer or if you are using on your personal computer just check this box!

Now again Go to your account settings and go to account security and see which device is register, as a pictured below

That’s it , Now you can check here , which computer is accessing your account or when !