New to Erdas but I have to do a project and I have chosen to do a landcover land change detection. I have two Landsat 5 images, five years apart from each other.
What is my next step?
I imagine I need to do all the preprocessing and after that, I am thinking of using raw image difference and NDVI.
I have Atcor, will that be what I need to convert my DNS into reflectance?
Best Answer
ATCOR for Erdas Imagine will convert DN to true reflectance--this step is critical for change detection analyses. Then you can use DeltaCue add-on in Erdas Imagine to detect land cover change. More details on the DeltaCue add-on can be found here. Additionally, there is a fairly good instructional video on how to use DeltaCue to get you started.
I would also recommend reading the literature on change detection--all of the papers describe in detail the preprocessing and change detection methods in detail. Here are a few to get you started:
Song, C., Woodcock, C. E., Seto, K. C., Lenney, M. P., & Macomber, S. A. (2001). Classification and change detection using Landsat TM data: when and how to correct atmospheric effects?. Remote sensing of Environment, 75(2), 230-244.
Howarth, P. J., & Wickware, G. M. (1981). Procedures for change detection using Landsat digital data. International Journal of Remote Sensing, 2(3), 277-291.
Chetverikov, B., Babiy, L., & Dorozhynskyy, O. (2013). Determining the influence of the earthquake on the change (s) of objects using remote sensing data. Geomatics, Landmanagement and Landscape.