Hi Luan,

To asses land use (LU) classification you can use overall accuracy or producer accuracy and overall kappa with ground survey of recent imagery data. For the last, you can compare the LU result with official topographic map.

Yes, I agreed with Moh.Dede. I would like to provide one of our research

Article Spatial Forecasting of the Landscape in Rapidly Urbanizing H...

Hi,

for classification accuracy assessment you can use overall accuracy (OA) and Kappa coefficient.

Unsupervised classification method you can use to test the data accuracy assessment and overall accuracy (OA) and Kappa coefficient of Erdas software