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It turns out the problem was a lingering projection issue. The NDVI scenes were default projecting in Arc as a similar, but different projection (sorry, I can't remember what it was off the top of my head), whereas the assigned projection from USGS was Lambert Azimuth Equal Area. The projection along with a tutorial of how to correct the issues are posted at ...


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If you are using ERDAS 2013, what you can do is go to raster, choose zonal change in the change detection panel, then choose image difference: Make sure you specify correctly the before map and the after map images, then you can specify directories for both outputs for the change in image and the highlighted one as shown. After specifying your threshold ...


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just find the projection type of one of your satellite image and project your other satellite image and the digitized layer to the same projection type.


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I recently discovered an ArcMap answer to my question: The image analysis window has swipe tool which is exactly the tool I was after. http://i.imgur.com/h5rBUkQ.png


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unfortunately gmdx could not be opened with previous versions of erdas. In fact gmdx is an xml file format that you can open it in a text support sotware like notepad. Note operators and data values.this way is useful in case of gmdx could not be opened even in recent versions due to bad data value or expression.however you can use this way to understand ...



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