GroundTrack
Description
GroundTrack
defines a ground track object belonging to a
satellite or a platform in a scenario.
Creation
You can create a GroundTrack
object using the groundTrack
object function
of the Satellite
or Platform
object.
Properties
LeadTime
— Period of ground track to be visualized
StartTime
to StopTime
or one
orbital period (default) | positive scalar
Period of the ground track to be visualized in the satellite scenario viewer, specified as
'LeadTime'
and a positive
scalar in seconds.
The default value is:
Satellite scenario
StartTime
toStopTime
whenOrbitPropagator
is set to'ephemeris'
Satellite scenario
StartTime
toStopTime
when the orbit is parabolic or hyperbolic andOrbitPropagator
is set to'numerical'
One orbital period, in all other cases.
TrailTime
— Period of ground track history to be visualized
StartTime
to StopTime
(default) | positive scalar
Period of the ground track history to be visualized in Viewer
, specified
as 'TrailTime'
and a positive scalar in
seconds.
The default value is:
Satellite scenario
StartTime
toStopTime
whenOrbitPropagator
is set to'ephemeris'
Satellite scenario
StartTime
toStopTime
when the orbit is parabolic or hyperbolic andOrbitPropagator
is set to'numerical'
One orbital period, in all other cases.
LineWidth
— Visual width of ground track
1
(default) | scalar in the range (0 10]
Visual width of the ground track in pixels, specified as 'LineWidth'
and
a scalar in the range (0 10].
The line width cannot be thinner than the width of a pixel. If you set the line width to a value that is less than the width of a pixel on your system, the line displays as one pixel wide.
LeadLineColor
— Color of future ground track line
[1 0 1]
(default) | RGB triplet | RGB triplet
| string scalar of color name
| character vector of color name
Color of the future ground track line, specified as 'LeadLineColor'
and
an RGB triplet, a hexadecimal color code, a color name, or a short name.
For a custom color, specify an RGB triplet or a hexadecimal color code.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
, for example,[0.4 0.6 0.7]
.A hexadecimal color code is a string scalar or character vector that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Therefore, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red"
|
"r"
|
[1 0 0]
|
"#FF0000"
|
|
"green"
|
"g"
|
[0 1 0]
|
"#00FF00"
|
|
"blue"
|
"b"
|
[0 0 1]
|
"#0000FF"
|
|
"cyan"
|
"c"
|
[0 1 1]
|
"#00FFFF"
|
|
"magenta"
|
"m"
|
[1 0 1]
|
"#FF00FF"
|
|
"yellow"
|
"y"
|
[1 1 0]
|
"#FFFF00"
|
|
"black"
|
"k"
|
[0 0 0]
|
"#000000"
|
|
"white"
|
"w"
|
[1 1 1]
|
"#FFFFFF"
|
|
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB® uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410]
|
"#0072BD"
|
|
[0.8500 0.3250 0.0980]
|
"#D95319"
|
|
[0.9290 0.6940 0.1250]
|
"#EDB120"
|
|
[0.4940 0.1840 0.5560]
|
"#7E2F8E"
|
|
[0.4660 0.6740 0.1880]
|
"#77AC30"
|
|
[0.3010 0.7450 0.9330]
|
"#4DBEEE"
|
|
[0.6350 0.0780 0.1840]
|
"#A2142F"
|
|
Example: 'blue'
Example: [0 0 1]
Example: '#0000FF'
TrailLineColor
— Color of ground track line history
[1 0.5 0]
(default) | RGB triplet | RGB triplet
| string scalar of color name
| character vector of color name
Color of the ground track line history, specified as 'TrailLineColor'
and
an RGB triplet, a hexadecimal color code, a color name, or a short name.
For a custom color, specify an RGB triplet or a hexadecimal color code.
An RGB triplet is a three-element row vector whose elements specify the intensities of the red, green, and blue components of the color. The intensities must be in the range
[0,1]
, for example,[0.4 0.6 0.7]
.A hexadecimal color code is a string scalar or character vector that starts with a hash symbol (
#
) followed by three or six hexadecimal digits, which can range from0
toF
. The values are not case sensitive. Therefore, the color codes"#FF8800"
,"#ff8800"
,"#F80"
, and"#f80"
are equivalent.
Alternatively, you can specify some common colors by name. This table lists the named color options, the equivalent RGB triplets, and hexadecimal color codes.
Color Name | Short Name | RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|---|---|
"red"
|
"r"
|
[1 0 0]
|
"#FF0000"
|
|
"green"
|
"g"
|
[0 1 0]
|
"#00FF00"
|
|
"blue"
|
"b"
|
[0 0 1]
|
"#0000FF"
|
|
"cyan"
|
"c"
|
[0 1 1]
|
"#00FFFF"
|
|
"magenta"
|
"m"
|
[1 0 1]
|
"#FF00FF"
|
|
"yellow"
|
"y"
|
[1 1 0]
|
"#FFFF00"
|
|
"black"
|
"k"
|
[0 0 0]
|
"#000000"
|
|
"white"
|
"w"
|
[1 1 1]
|
"#FFFFFF"
|
|
Here are the RGB triplets and hexadecimal color codes for the default colors MATLAB uses in many types of plots.
RGB Triplet | Hexadecimal Color Code | Appearance |
---|---|---|
[0 0.4470 0.7410]
|
"#0072BD"
|
|
[0.8500 0.3250 0.0980]
|
"#D95319"
|
|
[0.9290 0.6940 0.1250]
|
"#EDB120"
|
|
[0.4940 0.1840 0.5560]
|
"#7E2F8E"
|
|
[0.4660 0.6740 0.1880]
|
"#77AC30"
|
|
[0.3010 0.7450 0.9330]
|
"#4DBEEE"
|
|
[0.6350 0.0780 0.1840]
|
"#A2142F"
|
|
Example: 'blue'
Example: [0 0 1]
Example: '#0000FF'
VisibilityMode
— Visibility mode of ground track
'auto'
(default) | 'inherit'
| 'manual'
Visibility mode of the ground track, specified as either one of these values:
'inherit'
— Inherit visibility from the parent graphic. The visibility of the ground tack graphic matches that of the parent satellite or platform.'manual'
— Do not inherit visibility from the parent graphic. Visibility of the ground tack graphic is independent of that of the parent satellite or platform.'auto'
— Hidden by default in 3D viewers and visible by default in 2D viewers.
Object Functions
Examples
Add Ground Track to Satellite in Geosynchronous Orbit
Create a satellite scenario object.
startTime = datetime(2020,5,10);
stopTime = startTime + days(5);
sampleTime = 60; % seconds
sc = satelliteScenario(startTime,stopTime,sampleTime);
Calculate the semimajor axis of the geosynchronous satellite.
earthAngularVelocity = 0.0000729211585530; % rad/s orbitalPeriod = 2*pi/earthAngularVelocity; % seconds earthStandardGravitationalParameter = 398600.4418e9; % m^3/s^2 semiMajorAxis = (earthStandardGravitationalParameter*((orbitalPeriod/(2*pi))^2))^(1/3);
Define the remaining orbital elements of the geosynchronous satellite.
eccentricity = 0; inclination = 60; % degrees rightAscensionOfAscendingNode = 0; % degrees argumentOfPeriapsis = 0; % degrees trueAnomaly = 0; % degrees
Add the geosynchronous satellite to the scenario.
sat = satellite(sc,semiMajorAxis,eccentricity,inclination,rightAscensionOfAscendingNode,... argumentOfPeriapsis,trueAnomaly,"OrbitPropagator","two-body-keplerian","Name","GEO Sat");
Visualize the scenario using the Satellite Scenario Viewer.
v = satelliteScenarioViewer(sc);
Add a ground track of the satellite to the visualization and adjust how much of the future and history of the ground track to display.
leadTime = 2*24*3600; % seconds trailTime = leadTime; gt = groundTrack(sat,"LeadTime",leadTime,"TrailTime",trailTime)
gt = GroundTrack with properties: LeadTime: 172800 TrailTime: 172800 LineWidth: 1 LeadLineColor: [1 1 0.0670] TrailLineColor: [1 1 0.0670] VisibilityMode: 'inherit'
Visualize the satellite movement and its trace on the ground. The satellite covers the area around Japan during one half of the day and Australia during the other half.
play(sc);
Version History
Introduced in R2021a
See Also
Objects
Functions
show
|play
|groundStation
|access
|hide
|satellite
|platform
|groundTrack
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