1. East Timor Images Mosaic using ERMapper 7
1. Open Ermapper
2. Prepare the files
In this example, I use two satellite images of East Timor. The files are
dataset_comp3 and dataset_comp4

2. 3. Run Image Display and Mosaic Method
Click Browse
4. Find file (just select one of them)

3. 5. File(s) has been selected
You can choose whatever you want. The step that I have done used the setting
above.
6. Set files types and their properties.
You can choose whatever you want. The step that I have done used the setting
above.

4. 7. Select mosaic properties
You can choose whatever you want. The step that I have done used the setting
above. Stitch region can not be selected at the moment.
8. Select Display Method
You can choose whatever you want. The step that I have done used the setting
above.

5. 9. The result
We have a terrible result. Black colour creates a bad blend.
Next, we try use the (stitch) region.
Close all windows except main ERMapper window
10. From ERMapper main window, Open file(s)

6. 11. This is one of the example files
12. Display its Algorithm
13. Open Map Composition
(in Algorithm Window)

7. 14. I suggest, just select Raster Region mode
15. Edit the region
Some files will have an automatic region. ERMapper kindly gives us the region. If
you don’t like provided region just delete it by select the region and click this icon
.
Create a new region using this icon
. Close the region with double-click.

8. 16. Do like this (or any shape you want)
17. Name the region using this icon
18. Type meaningful name in the box below, and press Apply

9. 19. Region has been named with ‘jahit’ (example)
20. Save map composition using this icon
main ERMapper Window)
Just press OK
21. Region ‘jahit’ has been created
Just close
(in map composition window, not in

10. 22. Do the same to another (other) image(s)
In this example I have created one region on each image. The regions have the
same name ‘jahit’
23. Repeat Step 3 to Step 7
Select use stitch region, and name the region with jahit (or any name that you
have given). Region name on all images has to be the same.
The rest step is the same with step 8

11. 24. The result
Overlapping region needs
to be minimized. Thinner
is better.
The result depends on stitch regions. If we want to completely remove black
colour (on the images above), we should change the region on the files. Adjust the
region until overlapping region is minimised. A wide overlap creates unclear
image along the edge.
25. Have a coffee and watch simpson.
Thank to
• University of New England for ERMapper License.
• My brother Adalfredo Fereirra (Bio) for East Timor images
Contact me at beni.raharjo@gmail.com