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- APT-VIEW Demo
- for
- IBM PC Compatibles (MS-DOS)
-
- Dr TS Kelso
- tkelso@afit.af.mil
-
- 20 May 1993
-
-
- To run this demo, you will need the files AV-DISK1.ZIP, AV-DISK2.ZIP, and
- PKUNZIP.EXE (this is Version 2.04g). Once you have these files, you will
- need to unpack each of the .ZIP files to separate 1.2MB or 1.44MB diskettes.
- Once you have done this, you are ready to begin the installation.
-
- To set up the program, put the first diskette in the drive, change to that
- drive, and type
-
- INSTALL {source drive} {destination drive}
-
- The source drive is the drive with the diskette in it; the destination drive
- is the drive you want to install the program on. If you were installing from
- the B: drive and wanted to install to your C: drive, you would type
-
- INSTALL B: C:
-
- You can install to any valid drive in your system, as long as it has
- sufficient space to hold the software and the one sample image. Installing
- the full system takes 2680k plus about a megabyte of working space for saving
- screen images; if you didn't want the capability to save screen images and
- generate either a GIF image or PostScript file, you would only need 1713k. Of
- the disk space required, 1126k is for the image, 407k is for the map files,
- and 95k is for orbital data. We plan on tailoring the map files to reduce
- storage requirements and processing time.
-
- The configuration file (APT-RVW3.CFG) is set up assuming your display is
- capable of handling 640 x 480 resolution with 256 colors. You can, however,
- change this resolution within the software file. You will be able to tell if
- your display will handle this resolution when you run the install program; the
- first thing it does is run a program called G-TEST to test your graphics
- capabilities. G-TEST will start off by checking your color text capabilities;
- you should see a full screen with ``Test'' written all over it with various
- foreground and background colors. After this screen has displayed, hit ENTER
- to go to the graphics test portion.
-
- In this portion, you will be allowed to test the various resolutions supported
- by the software. Please test each of them (by selecting the resolution with
- the up/down cursor keys and hitting ENTER). You should have no problem with
- the first choice and should see a yellow box bounding the screen with a
- message in the upper-left corner stating the resolution and showing a
- 256-color bar. As you go through each mode, you may see a message flash by
- stating that this mode is not supported by your graphics card, followed by a
- jumbled screen. Make note of the highest resolution your system will support.
-
- After running the tests and exiting G-TEST, the install program will begin
- unpacking the software to the directory \APT-RVW on the destination drive.
- Once that is completed, you will be asked to insert the data diskette; simply
- press ENTER once you have. The image will be copied to the subdirectory
- IMAGES. This sample image was taken from NOAA 11 on 23 August 1992 during the
- 2053 UTC pass and shows Hurricane Andrew passing through the Bahamas.
-
- The image was captured using a five-element crossed yagi antenna (~$70) with
- Yaesu rotors (~$500) which were controlled by a standalone satellite tracking
- rotor controller called SAT TRAK II (~$300). The signal was fed through a
- Wraase preamp into a Wraase receiver (~$1500) and the audio signal was fed
- into an A-to-D converter (~$300) inside a 386 PC. Similar results could have
- been obtained using a quadrafilar antenna (~$300) and eliminating the rotors
- and rotor controller. Total cost (not including the PC) for the first system
- is approximately $2,670; for the second system it's $2,100.
-
- Here is what's in the APT-RVW3.CFG file on the demo disk:
-
- 2 ;mselect - 640 x 480 x 256
- 0 ;offset_x
- 0 ;offset_y
- 1 ;delta_x
- 1 ;delta_y
- APT-RVW3.NAM
- % Default drive for data files
- \apt-rvw\images\ % Default directory for data files
- SAT.RSA
- % Default drive for work files
- Yes % Delete .RAW files (Yes or No)
-
- The first line specifies the screen resolution; choices are:
-
- Mode Resolution
- ---- ----------
- 0 320 x 200
- 1 640 x 400
- 2 640 x 480
- 3 800 x 600
- 4 1024 x 768
-
- The next five lines should not be changed. If you wanted to put your data
- files in another directory, you would need to specify a default drive and
- directory; the configuration is set up with the current drive as the default
- and \APT-RVW\IMAGES\ as the default directory. The only other line you might
- want to change would be the default directory for work files. If you
- installed to a hard disk, processing files to transform to GIF or PostScript
- may be slow; simply specify a RAM drive here and you will cut these times
- considerably. If you don't feel comfortable with changing these values, there
- really is no need to do so.
-
- After everything has been copied to the destination disk, you are ready to run
- APT-RVW3F; the install program will end by doing this for you. At the first
- screen, press ENTER. At the second screen, select the resolution you wish to
- use and then press ENTER for the x and y offsets and x and y deltas; the first
- two do work (if you want to change them) but the deltas do not. Next, an
- image time will be displayed. This time can be changed but this is STRONGLY
- DISCOURAGED! If you mess up this time, you will not be able to overlay the
- map information. Under some rare circumstances, it may be desirable to change
- the minute value, but adjusting the time to the nearest half second is
- normally done on the image. At least for the demo, just hit ENTER here, too.
-
- Now, the image should display on the screen. Ascending passes will display
- from bottom to top; descending passes from top to bottom. The first thing you
- will likely want to do is adjust the image contrast and brightness through the
- palette. Type P to enter the palette mode and ESC to exit when done. To
- toggle between a linear gray scale and logarithmic, type T. You can use the
- cursor keys (for fine adjustment) or PgUp/PgDn (for coarse adjustment) to set
- these values; up and down controls brightness and left and right controls the
- threshold below which everything is set black. If the image gets too messed
- up, toggling will return you to the next default palette. I recommend simply
- toggling to a logarithmic scale (and possibly hitting PgUp once) and then
- hitting ESC; the computer will beep indicating the mode has completed.
-
- The next thing you would normally do would be to adjust the image. This is
- done by typing A and moving the cursor (which is vertically centered over in
- the minute mark portion of the image) in the direction which the image loaded
- until it is lined up with the beginning of the minute mark. This feature is
- not well designed for easy explanation and will be changed. Once you are
- lined up, hit ENTER and the time will be updated; the image time will not be
- updated unless you type U (NOT recommended unless you're sure you know what
- you're doing). If you decide after typing A that you don't want to do the
- update, press ESC.
-
- Once the time is set, you can use the map registration features. Typing H
- will show the home location (currently Wright-Patterson AFB) if it's on the
- map. Typing M will display all map features in the .WDB and .PNT map data
- files; you can remove any/all of these and the program will still work. If
- you type G, a grid of latitude and longitude points will be displayed at one-
- degree intervals with plus signs at five-degree interval; the satellite ground
- track will also be shown. Typing L will place a cursor on the screen and
- allow you to move it to any location; pressing ENTER will show the point's
- latitude and longitude and ESC exits this mode. If the display gets too busy,
- you can redisplay the screen by pressing D. This, of course, wipes out
- everything except the palette and time changes.
-
- The final features available are to display a title at the top of the image
- (by typing T) which shows the satellite name, and the date and time of the
- image. There is also a zoom feature which allows some crude magnification;
- the box can be moved around the screen with the cursor keys. Finally, you can
- save the image produced by typing S. A raw data file will be written to the
- work disk and a batch file created. After exiting the program (by pressing
- ESC twice), you can run this batch file to generate a GIF image. This batch
- file could be easily modified to produce PostScript output, too (instead).
-