Download - Image classification arc gis10
Image Classification in ArcGIS10
ByAshok Peddi
Introduction to image classification
• Image classification tool bar has been introduced in ArcGIS 10 with different classification techniques .
• Image classification is the process of converting multiband satellite image into single band image with different classes, defined or undefined.
• You can develop training sample and you can use the samples/ trained pixels which you have developed using other remote sensing software's as well.
• To use this tool bar you need spatial Analyst extension.
Open ArcGIS and right click on the main menu bar to enable the Image
Classification toolbar(default disabled from main menu).
You need to enable Spatial Analyst
Extension by going to customize ->
extension
Once you check “image classification "it automatically add to the ArcGIS main menu. Then add the image which you want to classify to Arc Map.
Once you add the image to Arc Map, it will be added to image
classification tool bar.
Click on iso clustered
Unsupervised Classification
Use these button to
add delete the images
and mention the number
of bands then click ok
ok
If you have training
sample(Signature file/shape file)
which you want to apply the same rules with this
image, You can. Click on sample manager(1) and
then click on open file(2). You can
even create training
pixels/samples
1
2
Now iso clustered unsupervised classification is ready
Observations
• Wide variety of algorithms available including supervised, unsupervised and hybrid as well.
• Processing may take longer time than remote sensing software's.
• Not robust algorithams• Interesting thing is class probability