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LANDSAT SCENE FINDER 2.0
(LSF)
USER'S GUIDE
Prepared For
EARTH OBSERVATION SATELLITE COMPANY
Goddard Space Flight Center
Greenbelt, Maryland
By
COMPUTER SCIENCES CORPORATION
(CSC)
Under
Contract A10001
Modified Under
PO# E01220 12/20/88
March 1989
Prepared By: Approved By:
_______________________________ _______________________________
H. Henry Date T. Butschky Date
Software Developement Software Manager
SECTION 1 - INTRODUCTION
The Landsat Scene Finder (LSF) was developed to aid users of
Landsat data to find scenes that match a given set of criteria.
LSF allows the user to enter a point of interest either in
latitude/longitude or path/row coordinates, output graphically
for both the day and night scene, and the adjacent scenes for
that point of interest. Information can be displayed on the
screen in either text or graphic format.
SECTION 2 - HARDWARE AND SOFTWARE REQUIREMENTS
In order to use the LSF application, the following hardware and
software is required.
Required Equipment
o IBM PC (or a compatible) with a minimum of 640K of
memory and at least 1/2 Megabyte of available hard
disk storage
o EGA Compatible Color Monitor capable of 640 x 350
resolution
o EGA Compatible Color Graphics Adapter capable of
640 x 350 resolution
o Math Coprocessor
Required Software
o PC-DOS 3.0 or higher operating system.
Options
o Raster Type Hard Copy Device (equivalent to a
CALCOMP COLORMASTER)
SECTION 3 - OPERATIONAL PROCEDURES
The procedures contained herein assume that the LSF is properly
installed on the users hard disk.
3.1 STARTING UP THE LANDSAT SCENE FINDER
To start go to the directory where the LSF files are located. To
do this type "CD\LSF" and press [ENTER]. To load the system type
"LSF" and press [ENTER]. The program will then display the menu
screen (see Figure 3-1).
3.2 RUNNING THE LANDSAT SCENE FINDER
LSF will begin with a highlighted box in the latitude field. The
input fields available are Latitude, Longitude, Path, Row, and
Ground Correction fields (see Figure 3-2). To change input
fields, enter a valid value and press the [ENTER] key; use the
arrow keys, or [TAB] key to position the highlighted box to the
desired input field. If an error is detected in the input
values, LSF will sound an alarm and highlight the erroneous input
value to permit editing of this field. The numeric values can be
displayed by selecting the F8 function (see Section 3.15). The
graphic representation can be displayed by selecting the F9
function (refer Section 3.16).
NOTE: The LSF will use the LAST PAIR of input values;
therefore, if a valid pair of Latitude/Longitude
points are input followed by the input of a valid pair
of Path/Row points, LSF will use the Path/Row points
NOT the Latitude/Longitude pair.
3.2.1 EDITING INPUT FIELDS
If after entering a value in an input field the user desires to
alter a value, LSF will allow editing the field. The arrow keys
are used to move around in the field. The [INSERT] key will
allow input at the cursor location in the field; the [DELETE] key
will allow deleting of characters at the cursor location in the
field. The [HOME] key will position the cursor to the beginning
of the field, and the [END] key will position the cursor to the
end of the field.
3.3 ENTERING LATITUDE/LONGITUDE COORDINATES
To enter Latitude/Longitude coordinates, position the highlighted
box to the Latitude position on the screen. Enter the desired
Latitude followed by pressing the [ENTER] key. If LSF detects an
error, it will sound an alarm and allow the user to reenter or edit
the field (refer to Section 3.1.1). To enter Longitude move the
highlighted box to the Longitude position on the screen and input the
desired Longitude followed by pressing the [ENTER] key. If LSF
detects an error, it will sound an alarm and allow editing or
reentering of the field (refer to Section 3.2.1).
NOTE: If an incorrect value is entered twice in a row, LSF
will position the highlighted box to the next input
field. When trying to either Recalc (F8) or Toggle to
graphics display (F9), LSF will detect the error, sound
an alarm, and position the highlighted box to the
erroneous field.
3.4 ENTERING PATH/ROW COORDINATES
To enter Path/Row coordinates, position the highlighted box to
the Path position on the screen; enter the desired path (valid
paths are 1-223) followed by pressing the [ENTER] key. If LSF
detects an error, an alarm will sound and allow the user to
reenter or edit the field (refer to Section 3.2.1). To enter row
coordinates position the highlighted box to the Row position on
the screen; enter the desired row (valid rows are 1-245) followed
by pressing the [ENTER] key. Again, if LSF detects an error, it
will sound an alarm and allow the user to reenter or edit the
field (refer to Section 3.2.1).
NOTE: If an incorrect value is entered twice in a row, LSF
will position to the next input field. When either
the Recalc (F8) or the Toggle to graphics display
(F9) key is depressed, LSF will detect the error,
sound an alarm, and position the highlighted box to
the field where the error occurred.
3.5 ENTERING GROUND CORRECTION
To enter ground correction, position the highlighted box to the
ground correction position on the screen. Enter the desired ground
correction factor in kilometers. If LSF detects an error it will
sound an alarm and allow either editing or reentering of the
field (refer to Section 3.2.1).
WARNING: The ground correction input affects the way LSF
calculates scene positions, therefore, entering
any value other than 0.0 has an impact. LSF will
allow ground correction up to 20.00 kilometers;
however, the Landsat mission requirement for
spacecraft drift is +10.0 or -10.0 kilometers.
NOTE: If an incorrect value is entered twice in a row,
LSF will position to the next input field. When trying
to either Recalc (F8) or Toggle to graphics display
(F9), LSF will catch the error, sound an alarm, and
position the highlighted box to the field where the
error occurred.
3.6 TEXT DISPLAY PAGE
The text display page can be broken up into two parts: (1) the
user input data area (see Figure 3-2), and (2) the LSF output
area (see Figure 3-4). The user display area consists of items
that may be inputted to LSF. These items are as follows:
Path/Row or Latitude/Longitude, and Ground Correction. The LSF
output area (see Figure 3-3) can be split up into two parts.
These parts are descending (DAY) or ascending (NIGHT) areas.
After successfully entering the desired point (refer to Sections
3.2 or 3.3 and 3.4), LSF will calculate and fill in the Path/Row
and the upper left corner, upper right corner, lower left corner,
lower right corner, center of the scene and center points
between each corner in latitude, and longitude degrees for
both day and night scenes. If possible, it will also show the
Quad number the point resides in for both Day and Night
scenes.
3.7 GRAPHICS DISPLAY PAGE
When viewing the graphics screen, the numbers on the left are
latitude marks and the numbers on the bottom of the screen are
longitude marks. At the top of the screen just below the text
"LANDSAT SCENE FINDER" the point of interest is displayed in
degrees as is all Latitude and Longitude information on the
graphics screen. At the bottom of the graphics screen to the
left of the text Longitude if the NIGHT option is set to yes
the night path/row information will be displayed in blue text.
And to the right of the text Longitude if the DAY option is
set to yes the day path/row information will be displayed in
red. Day scenes are defined as "squares" which angle to the
right and night scenes are defined as "squares" which angle to
the left. The symbol "X" represents scene centers and also
the point of interest. Lines going through the center of the
"squares" indicate the spacecraft track. These lines also
have "arrows" showing which direction the spacecraft travels.
LSF on the development system shows the Day scene as green
"squares", Adjacent day scenes (green). The point of interest
is defined with a black "X" mark. Each of the scene's center
points are marked with the scenes surrounding color also using
an "X" to mark the scene's center point. It should be noted
that different monitors and graphic cards MAY display
different colors than the development system.
3.8 HELP FUNCTION (F1)
The Help function is only available when viewing the text screen
(see Figure 3-1). To obtain help on any of the LSF functions,
depress the [F1] key while viewing the text screen. A help
text window will appear on the middle of the text display. To
obtain help on a function of LSF, depress the function key help is
desired on. LSF will display the help window with the information
for the requested function.
3.9 DAY SCENE FUNCTION (F2)
The Day Scene function provides the ability to select whether or
not Day Scenes are to be drawn on the graphics display. The
current state of this function is displayed on the bottom of the
text screen in the status area of the display options (see Figure
3-4). ON = Day scenes are displayed; OFF = Day scenes are not
displayed.
3.10 NIGHT SCENE FUNCTION (F3)
The Night Scene function provides the ability to select whether
or not Night Scenes are to be drawn on the graphics display. The
current state of this function is displayed on the bottom of the
text screen in the status area (see Figure 3-4). ON = Night
scenes are displayed; OFF = Night scenes are not displayed.
3.11 ADJACENT SCENE FUNCTION (F4)
The Adjacent Scene function provides the ability to select
whether or not Adjacent Scenes (the scenes which fall to the
left and right of the scene of interest) are to be drawn on the
graphics screen. The current state of this function is displayed
on the bottom of the text screen in the status area (see Figure
3-4) as ON = Adjacent scenes will be drawn; or OFF = Adjacent
scenes will not be drawn.
3.12 QUAD FUNCTION (F5)
The Quad function provides the ability to select whether or not
Quad Boundaries within the scene of interst are to be displayed
on the graphics page. The current state of this function is
displayed on the bottom of the text screen in the status area
(see Figure 3-4) as ON = Quad boundaries will be drawn; or OFF =
Quad boundaries will not be drawn.
3.13 GRID FUNCTION (F6)
The Grid function provides the ability to select whether or not a
Grid is displayed on the graphics page. The Grid is drawn using
the latitude tick marks and projecting them horizontally and
using the longitude tick marks and projecting them vertically.
This provides the ability to exactly locate points on the
scene(s) view. The current state of this function is displayed
on the bottom of the text screen in the status area (see Figure
3-4) as ON = Grid to be drawn; or OFF = Grid will not be drawn.
3.14 PRINT FUNCTION (F7)
The Print function provides the ability to make a hardcopy of the
text screen. This report is a reformatted text page display
showing the point of interest for both day and night scenes; the
scene center, upper left, upper right, lower left, lower right
corners, and the midpoints between each of the corners.
3.14.1 MAKING COLOR HARDCOPIES
To make a color plot the user must have the screen dumping
utility installed (refer to hardware/software requirements in
Section 2) and depress both the [SHIFT] and [PRINT SCREEN] keys
together.
3.15 RECALC FUNCTION (F8)
The Recalc function instructs LSF to (re)calculate scene
coordinates using the last selected point of interest. Values for
the scene center, upper left, upper right, lower left, and lower
right corners, as well as midpoints between each corner are
computed and displayed for both Day and Night scenes
(see Figure 3-3).
3.16 TOGGLE TO GRAPHICS FUNCTION (F9)
The toggle to graphics function instructs LSF to graphically
display the requested scene information based upon which
functions that have been selected by the user (refer to functions
F2, F3, F4, F5, F6, and see Figure 3-4).
3.17 EXITING LSF (F10)
To exit LSF the user must depress the [F10] key while on the text
page.
3.18 UP/LOW (Shift_F1)
The show upper and lower scenes function will on the graphics screen
show the scenes above and below the requested area. The requested area
is defined by the user using the aforementioned functions. For example;
if the NIGHT function is set to No and both the ADJACENT scene function
and the Day scene funtion is set to Yes, when viewing the graphics
screen, the scene above and below the selected scene will be displayed
and the scene above and below each adjacent scene will be displayed.
╔═════════════════════════════════════════════════════════════════════════════╗
║ LANDSAT SCENE FINDER Version 2.0 ║
╠═════════════════════════════════════════════════════════════════════════════╣
║ Select Point of Interest: Latitude: Longitude: ║
║ or ║
║ Select Scene of Interest: Path: Row: ║
║ ║
║ If you want to correct for actual orbit, as opposed to theoretical orbit, ║
║ enter horizontal correction in kilometers: ║
╠═════════════════╤════════════════════════╤═════════════════╤════════════════╣
║Descending (Day) │ Left │ Center │ Right ║
║ Path: ppp │ Top: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Row: rrr │Center: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Quad: N/A │Bottom: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
╠═════════════════╪═══════════════════════════════════════════════════════════╣
║Ascending (Night)│ Left │ Center │ Right ║
║ Path: ppp │ Top: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Row: rrr │Center: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Quad: N/A │Bottom: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
╠═════════════════╧═══════════════════════════════════════════════════════════╣
║ F1-Help F8-Recalc F9-Toggle to Graphic Display F10-Exit ║
║ F7-Print Report ║
║ Display Options: F2-Day (Yes ) F3-Night (No) F4-Adjacent Scenes (No ) ║
║ F5-Quad (Yes ) F6-Grid (No) Shift_F1-Up/Low (Yes) ║
╚═════════════════════════════════════════════════════════════════════════════╝
Figure 3-1
(LSF Menu page)
╔═════════════════════════════════════════════════════════════════════════════╗
║ LANDSAT SCENE FINDER Version 2.0 ║
╠═════════════════════════════════════════════════════════════════════════════╣
║ Select Point of Interest: Latitude: Longitude: ║
║ or ║
║ Select Scene of Interest: Path: Row: ║
║ ║
║ If you want to correct for actual orbit, as opposed to theoretical orbit, ║
║ enter horizontal correction in kilometers: ║
╠═════════════════╤════════════════════════╤═════════════════╤════════════════╣
Figure 3-2
(LSF Input Area)
________________________________________________________________________________
║Descending (Day) │ Left │ Center │ Right ║
║ Path: ppp │ Top: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Row: rrr │Center: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Quad: N/A │Bottom: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
╠═════════════════╪═══════════════════════════════════════════════════════════╣
║Ascending (Night)│ Left │ Center │ Right ║
║ Path: ppp │ Top: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Row: rrr │Center: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
║ Quad: N/A │Bottom: lat.dd, long.dd │ lat.dd, long.dd │ lat.dd, long.dd║
╠═════════════════╧═══════════════════════════════════════════════════════════╣
Figure 3-3
(LSF Output Area)
╠═════════════════╧═══════════════════════════════════════════════════════════╣
║ F1-Help F8-Recalc F9-Toggle to Graphic Display F10-Exit ║
║ F7-Print Report ║
║ Display Options: F2-Day (Yes ) F3-Night (No) F4-Adjacent Scenes (No ) ║
║ F5-Quad (Yes ) F6-Grid (No) Shift_F1-Up/Low (Yes) ║
╚═════════════════════════════════════════════════════════════════════════════╝
Figure 3-4
(LSF Status Area)
ACRONYMS
CSC Computer Sciences Corporation
EGA Enhanced Graphics Adapter
EOSAT Earth Observation Satellite Comp[any
IBM International Business Machines Corporation
LSF Landsat Scene Finder