How to classify NDVI image using ERMapper & ERDAS Imagine
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How to classify NDVI image using ERMapper & ERDAS Imagine
By Rafil in ERDAS Software Forum
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Hi All,
Kindly, could anyone let me know how to classify the Landsat based NDVI fraction image with real data type (from -1 to 1) using ERMapper 7.1 and ERDAS Imagine 9.2 packages into three classes by unsupervised classifier. I couldn’t do it unless convert its DN values into 8 bits data type (from 0-255). Normal 0 false false false EN-US X-NONE AR-SA Any help will be highly appreciated.
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Re: How to classify NDVI image using ERMapper & ERDAS Imagine
By Carl Yates in ERDAS Software Forum
You could save the output of the ndvi to a 4 or 8 byte real and then run the classification on this
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By Rafil in ERDAS Software Forum
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Dear Carl, thanks a lot for your concern. Unfortunately it doesn’t work using ERMapper when the image type is 4 or 8 byte real. Could you give more details please. I don’t know why I could classify an image with 4 or 8 byte real by ERMapper. I am really confused.
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By Carl Yates in ERDAS Software Forum
Really it would be best if you contact technical support sup...@erdas.com as this may get quite envolved.
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By Rafil in ERDAS Software Forum
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Dear Carl, many thanks for your replies. I think I have to change the default values those in options of Unsupervised classification window in order to go on the classification task. So, kindly could you tell me the values recommended to type in the options fields in that window in order to classify the NDVI image (with real values from -1 to 0.8). Thanks a lot in advance.