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How to measure the area of a specific land use feature with the help of image processing?
The area of any land use can be measured with the help of image processing software Free View.
1.The first step of measuring the area is to identify the group of pixels that represents that land use feature.
2. At least 20-30 pixel values are required.
3. First open the image of interest in the software by clicking the Open sub-menu under the File menu.
4. After you open an image you two tab on the right side will show the name of the image file and three bands(Red,Green and Blue).The bands will be shown under the Map tab and in the File tab the name of the image file along with the three bands will be shown in three distinct colours(i.e.Red,Green and Blue).Go to the Map tab and select any one band.Right click in the mouse and select the "Histogram" option of the dropdown menu. Also go to the View menu and select the Edit Pixel sub-menu to see the pixel value of the point you have clicked with your cursor.Now place your cursor on the histogram.The count of the pixel you have clicked(on the histogram) will be shown just beside the Current Count field.Select the pixel value of the point in the histogram and note down the count of the same.Similarly select points on the same landuse and find the count of the pixel value from the histogram.Repeat this for each of the twenty or thirty pixels.
5.Now open a excel file and create three columns. One will hold the pixel value,the other one will hold the count of the pixel value and the last one will hold the result of dividing the pixel count by total count of pixel available in the image.A fourth column will be required to hold the result of the third column multiplied by 100 or image area(in square units).Adding all the values of the fourth column will give us the area of the land use in percentage or in square units.
Tutorials
hydrologic simulators available for free download
Water Quality Index Calculator V2
Posted: June 16th, 2010, 1.34am EST
A new version of Water Quality Index Calculator was launched today.The feedbacks from the past version was included in this version.Like,in V2 you can estimate WQI of a set of data by importing an entire excel datasheet and found the value as Final WQI.Another advantage of this version is you can save and/or export the data as per your requirment.Though V2,this apps is presently in beta.Lots of bugs may arise.Please notify me if you find any.More.
Agro-Optimizer
Posted: December 8th, 2009, 5:14am EST
The agro-optimizer will help to optimize the output from a agricultural field.The optimizer will optimize the selling price and water requirement to achieve a desired profit.More