Panchromatic Image Sharpening of Landsat 7 ETM+: Modified IHS Resolution Merge method

On my previous post, I write about Panchromatic Image Sharpening using ERDAS with resolution merge method.  Now I want to tell you othe methode, is by modofied IHS Resolution.  Here are the steps:

1. Open ERDAS IMAGINE
2. From the main menu, click Interpreter -> Spatial Enhancement... -> Mod. IHS Resolution Merge...

ERDAS IMAGINE Main Menu
3. Within the Modified IHS Resolution Merge display box, click the folder button under High Resolution Input File: (*.img) and navigate to the location where the panchromatic band is saved
4. Once you have located the folder where the panchromatic band is saved, click the dropdown arrow next to Files of type and select TIFF
5. Select the panchromatic band (*_B80.TIF) and click OK
6. Next, click the folder button under Multispectral Input File: (*.img) and navigate to the location where the multispectral bands are saved
7. Again you will need to click the dropdown arrow next to Files of type and select TIFF
8. Select all of the multispectral bands (all bands minus *_B61.TIF, *_B62.TIF, and *_B80.TIF) and click OK
9. Next, under Resampling Technique, select your preferred resampling option by clicking the radio button next to Nearest Neighbor, Bilinear Interpolation, and Cubic Convolution
10. Under Hi-Res Spectral Settings, click the dropdown arrow next to Sensor and select Landsat 7 Panchromatic (leave the layer value and the Ratio Ceiling value as the defaults)

Modified IHS Resolution Merge Display Box
11. For Multispectral Spectral Settings, click the dropdown next to Sensor and select Landsat 7 Multispectral (leave the default layer values)
12. Next, click on the Output tab

Designating Output File and Location
13. Click the folder button under Output File: (*.img) and navigate to the location where you would like to save the output data
14. Once you have located the folder where you would like to save the output data, click the dropdown arrow next to Files of type and select TIFF
15. Provide a file name for the output data and click OK
16. Under the Data Type section, make sure that the Output is set to Unsigned 8 bit
17. For Landsat ETM+ data transformation you should not need to check any of the boxes listed under Processing Options
18. Click OK to initiate the modified IHS resolution merge (please note that it will take quite some time to run the resolution merge; you will receive an error message if there is not enough space to perform and save the output data to the specified location)
19. Follow Steps 18-37 above for viewing the pan-sharpened image and for comparing it to the original 30-meter data (the images below show a comparison between pan-sharpened Modified IHS data on the left and 30-meter data on the right)

Comparison Between Modified IHS and Original Data
USGS.GOV
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