home *** CD-ROM | disk | FTP | other *** search
- text line 20 sample 1 'Welcome to a demonstration of'.
- text line 45 sample 1 'digital orthophotographic imagery.'.
- text line 150 sample 50 'Just sit back and enjoy !!!'.
- text line 250 sample 50 'Produced by Bob Gurda'.
- text line 275 sample 80 'Wis. State Cartographer's Office'.
- text line 300 sample 110 ' April, 1991'
- text line 375 sample 1 'Press the ENTER key to start.'.
- cursor
- erase
- text line 20 sample 1 'An orthophotograph is much like an'.
- text line 45 sample 1 'aerial photograph, but with one'.
- text line 70 sample 1 'important difference: the various'.
- text line 95 sample 1 'types of distortions normally found'.
- text line 120 sample 1 'in the aerial photograph have been'.
- text line 145 sample 1 'removed by a special process. The'.
- text line 170 sample 1 'result is a photographic image that'.
- text line 195 sample 1 'can be used as a map---for measuring'.
- text line 220 sample 1 'distances, angles, and areas'.
- text line 265 sample 1 'An orthophotograph can be printed on'.
- text line 290 sample 1 'paper or photo film. Or it can be'.
- text line 320 sample 1 'scanned into computerized form'.
- text line 380 sample 50 'Press the ENTER key to continue'.
- cursor
- erase
- text line 20 sample 1 'A digital image is based on a computer'.
- text line 45 sample 1 'file that represents a grid of cells.'.
- text line 90 sample 1 'The image you'll be seeing in this demo'.
- text line 115 sample 1 'is made of 1 million cells. The cells'.
- text line 140 sample 1 'are arranged as 1000 rows, each row'.
- text line 165 sample 1 'containing 1000 cells. Since each cell'.
- text line 190 sample 1 'represents an area about 4 X 4 meters on'.
- text line 215 sample 1 'the ground, the area shown is about 4 X 4'.
- text line 240 sample 1 'kilometers, or about 6 square miles.'.
- text line 320 sample 50 'Press the ENTER key to continue.'.
- cursor
- erase
- set dn lo 0 hi 191
- text line 20 sample 1 'First we'll look at the entire image'.
- text line 60 sample 1 'Since it won't fit on a VGA screen at'.
- text line 85 sample 20 'full resolution, we'll only be seeing'.
- text line 110 sample 20 'every third cell in every third row'.
- text line 250 sample 50 'Press the ENTER key for the display'.
- text line 350 sample 1 '(Note: do not press the ENTER key while'.
- text line 375 sample 1'images are being drawn on the screen.
- Doing'.
- text line 400 sample 1 'so will cause this demo program to stop).'.
- cursor
- erase
- disp sub 3
- text line 20 sample 350 'This scene shows the'.
- text line 45 sample 350 'area near the village'.
- text line 70 sample 350 'of Black Earth, WI.'
- text line 360 sample 1 'Use the arrow keys to position the cursor'.
- text line 385 sample 20 'over a place that looks interesting'.
- text line 410 sample 50 '...then press the ENTER key to continue'.
- cursor
- erase
- text line 20 sample 1 'Next you'll see some of the cells that'.
- text line 45 sample 1 'make up the image. Each cell has a'.
- text line 70 sample 1 'gray level value between 0-255.'
- text line 360 sample 50 '...press the ENTER key to continue'.
- cursor
- erase
- disp center zoom 4
- text line 410 sample 50 '...Press the ENTER key to continue.'
- cursor
- erase
- text line 20 sample 1 'You will next see an enlarged area'.
- text line 45 sample 1 'around the image point you selected'.
- text line 80 sample 1 'This will be shown at full resolution.'.
- text line 250 sample 50 'Press the ENTER key to proceed'.
- cursor
- erase
- disp center zoom 2
- text line 330 sample 50 'Press the ENTER key to continue'.
- cursor
- erase
- text line 20 sample 1 'The final part of this demo shows how'.
- text line 45 sample 1 'the 256 levels of gray encoded in the'.
- text line 70 sample 1 'digital image file can be selectively'.
- text line 95 sample 1 'displayed. Since a VGA computer monitor'.
- text line 120 sample 1 'can only show 16 levels of gray, we'.
- text line 145 sample 1 'have to compress, or categorize'.
- text line 170 sample 1 'ranges of grays in the digital file when'.
- text line 195 sample 1 'we want to view the entire range of grays'.
- text line 220 sample 1 'In doing so, useful information may not'.
- text line 245 sample 1 'be visible on the screen. The solution'.
- text line 270 sample 1 'to this problem is to "slice" the image'.
- text line 295 sample 1 'into gray ranges, and view each slice '.
- text line 320 sample 1 'separately.'
- text line 390 sample 50 '...Press the ENTER key to continue'.
- cursor
- erase
- text line 20 sample 1 'In the following set of images, notice'.
- text line 45 sample 1 'that some features (woods, fields, '.
- text line 70 sample 1 'roads, streams, roofs) appear in some'.
- text line 95 sample 1 'of the gray level slices, but not in'.
- text line 120 sample 1 'others. This is because these different'.
- text line 145 sample 1 'objects have different ranges of gray,'.
- text line 170 sample 1 'as seen by the camera in the airplane.'
- text line 330 sample 50 '...Press the ENTER key to continue.'
- cursor
- erase
- set dn lo 0 hi 31
- disp center
- set dn lo 15 hi 47
- disp center
- set dn lo 31 hi 63
- disp center
- set dn lo 47 hi 79
- disp center
- set dn lo 63 hi 95
- disp center
- set dn lo 79 hi 111
- disp center
- set dn lo 95 hi 127
- disp center
- set dn lo 111 hi 143
- disp center
- set dn lo 127 hi 159
- disp center
- set dn lo 0 hi 191
- disp center
- text line 400 sample 50 '...Press the ENTER key to continue'
- cursor
- erase
- text line 20 sample 1 'This completes the demo.'.
- text line 60 sample 1 'To run this demo again, wait until'.
- text line 85 sample 1 'the last image is displayed. Then'.
- text line 110 sample 1 'Press the ENTER key to repeat.'.
- text line 160 sample 1 'To leave this demo without the repeat,'.
- text line 185 sample 1 'Press the ENTER key while the last'.
- text line 210 sample 1 'image is being drawn.'
- text line 330 sample 50 '...Press the ENTER key to continue'.
- cursor
- erase
- disp sub 3
- batch demo4k.bat