GroundTrack
Description
GroundTrack
defines a ground track object belonging to a
satellite in a scenario.
Creation
You can create a GroundTrack
object using the groundTrack
object function
of the Satellite
object.
Properties
LeadTime
— Period of ground track to be visualized
StartTime
to StopTime
(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.
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.
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" | |
"none" | Not applicable | Not applicable | Not applicable | No color |
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" | |
"none" | Not applicable | Not applicable | Not applicable | No color |
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
'inherit'
(default) | 'manual'
Visibility mode of the ground track, specified as either one of these values:
'inherit'
— Visibility of the graphic matches that of the parent.'manual'
— Visibility of the graphic is not inherited and is independent of that of the parent.
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
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