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I'm trying to achieve accuracy assessment in Erdas, but I've faced some difficulties due to my lack of knowledge about it.

I've finished an object based classification in eCognition, but whenever I try to obtain an accuracy assessment, it always give %100 accuracy with TTA mask, so I gave up.

now, I've decided to get that accuracy results from ERDAS because of high reliability to ERDAS among the users.

Workflow:

I've got classified shapefile and the raster file I've used to achieve classification. in ERDAS, it asks for an .img file which is a thematic raster file it says. so how can I generate an .img file from my existing .tif and .shp files? or is it even necessary to execute that process?

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For whom looking for the answer for this question, please check the link below;

http://shreshai.blogspot.com.tr/2014/08/exporting-ecognition-classification.html

Besides; You can export the classification directly from eCognition as an .img file.

Workflow: Use the algorithm "export thematic raster files" > Define the path > Select export type: Classification > then Execute.

now you have given "thematic raster file" to process in Erdas Accuracy Assessment tool.

*Be careful about the classes you're exporting. Null classes, even if you've not assigned any sample inside, going to affect your accuracy assessment results.

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