Subset the Image with Respect to Rectified Toposheet

i. Subset The Image With Respect To Rectified Toposheet 56F11

1. Click on VIEWER Icon of the Main Tool Bar
2. Select Viewer type as CLASSIC VIEWER
3. Click OK to get a blank Viewer Window
4. Click on OPEN option from File Menu
5. Select RASTER LAYER option
6. Then Browse for the File PRE_RECT_IMAGE_99-59.IMG and select the same file
7. Click on OK to display on the viewer
8. Right Click and select IMAGE FIT TO WINDOW Option
9. Again Click on OPEN option from File Menu
10. Select RASTER LAYER option
11. Then Browse for the File SUBSET_TOPO_F11.IMG and select the same file
12. Click on OK to display on the viewer

ii. Defining the AOI

13. Click on the AOI Menu on the Viewer Window
14. Click on TOOLS option. Then AOI Tool Bar will be displayed as shown previously
15. Click on to create a polygonal AOI. In the Viewer, along the border of the toposheet digitize for AOI. Then the AOI is shown below

16. The Rectangular Box shows the AOI

iii. Subset the image based on AOI

17. Click on DATPREP Icon of the Main Tool Bar
18. Select SUBSET IMAGE option. Then it will display SUBSET Window as shown previously
19. Select INPUT Files as PRE_RECT_IMAGE_99-59.IMG
20. Type OUTPUT FILE name as SUBSET_IMAGE_99-59_F11
21. Select the FOUR CORNERS options as the SUBSET DEFINITION
22. CHECK on IGNORE ZEORS IN OUTPUT STAT
23. Click on AOI Tab. Then Choose AOI Window Displayed as shown Previously
24. Select VIEWER Option
25. Click OK to get back to SUBSET Window
26. Click OK

iv. Viewing the SUBSET Image

27. Click on VIEWER Icon of the Main Tool Bar
28. Select Viewer type as CLASSIC VIEWER
29. Click OK to get a blank Viewer Window
30. Click on OPEN
31. Select RASTER LAYER option
32. Then Browse for the File SUBSET_Image_99-59_F11.IMG and select the same file
33. Click on OK to display on the viewer
34. Right Click and select IMAGE FIT TO WINDOW Option

Subset he Image With Respect To Rectified Toposheet 56 F12

SUBSET THE IMAGE WITH RESPECT TO SUBSET TOPOSHEET SUBSET_TOPO_F12.IMG and Saved this as SUBSET_IMAGE_99-59_F12 by following the above procedure.

vi. Viewing both the subset images

35. Click on VIEWER Icon of the Main Tool Bar
36. Select Viewer type as CLASSIC VIEWER
37. Click OK to get a blank Viewer Window
38. Click on OPEN from the FILE Menu
39. Select RASTER LAYER option
40. Then Browse for the File SUBSET_Image_99-59_F11.IMG and select the same file
41. Click on OK to display on the viewer
42. Right Click and select IMAGE FIT TO WINDOW Option
43. Click on OPEN from the FILE Menu
44. Select RASTER LAYER option
45. Then Browse for the File SUBSET_Image_99-59_F12.IMG and select the same file
46. Click on OK to display on the viewer
47. Right Click the mouse button and select IMAGE FIT TO WINDOW Option
48. Then you may observe that a small portion of the two-subset images is overlapped.