In [1]:
from poliastro.czml.extract_czml import CZMLExtractor
WARNING: AstropyDeprecationWarning: astropy.extern.six will be removed in 4.0, use the six module directly if it is still needed [astropy.extern.six]
In [2]:
from poliastro.examples import molniya
To initialize the extractor, you'll only need the starting and ending epoch of the time period you wish to visualize and the number of sample points. The larger the sample point size, the more accurate the trajectory and the bigger your packets. Finding that sweet spot between reasonable package size and visual accuracy depends on the specific orbit. Generally, you'll need a bigger sample for faster satellites. You could also "break" your orbit into different parts and define the sample size individually (for example, this could be useful when the satellite accelerates within a certain time interval).
For this specific example, we're only interested in a single orbital period.
In [3]:
start_epoch = molniya.epoch
end_epoch = molniya.epoch + molniya.period
N = 80
In [4]:
extractor = CZMLExtractor(
start_epoch,
end_epoch,
N
)
To add an orbit you can simply call add_orbit
and pass your Orbit
along with an optional precision parameter (rtol
). However, there are also many optional parameters you can pass to the extractor to specify the visual characteristics of your trajectory:
id_name
: The orbit id name
id_description
: The orbit's description
path_width
: The trajectorie's width. It's defined in pixels and defaults to 1.0
path_show
: Whether the trajectorie's path is visible (true by default)
path_color
: The trajectorie's color, a simple list with the rgba values (e.g. [45, 30, 50, 255]
)
label_text
: The label text; the text that appears besides the orbit.
label_show
: Whether the label is visible (true by default)
label_fill_color
: The fill color of the label , a simple list with the rgba values
label_outline_color
: The fill color of the label , a simple list with the rgba values
label_font
: The font properties (CSS syntax)
show_groundtrack
: Whether the groundtrack is visible (true by default)
groundtrack_lead_time
: The time the animation is ahead of the real-time groundtrack
groundtrack_trail_time
: The time the animation is behind the real-time groundtrack
groundtrack_width
: The groundtrack width
groundtrack_color
: The groundtrack color. By default, it is set to the trajectory's color
In [5]:
extractor.add_orbit(molniya,
id_name="MolniyaOrbit",
path_width=2,
label_text="Molniya",
label_fill_color=[125, 80, 120, 255]
)
You can now export the extractor packets by simply calling extractor.packets
and load it to the Cesium app as described here
In [6]:
extractor.packets
Out[6]:
[{
"id": "document",
"version": "1.0",
"name": "document_packet",
"clock": {
"interval": "2000-01-01T12:00:00.000/2000-01-01T23:59:35.108",
"currentTime": "2000-01-01T12:00:00.000",
"multiplier": 60,
"range": "LOOP_STOP",
"step": "SYSTEM_CLOCK_MULTIPLIER"
}
}, {
"id": "custom_properties",
"properties": {
"custom_attractor": true,
"ellipsoid": [
{
"array": [
6378136.6,
6378136.6,
6356751.9
]
}
],
"map_url": [
"https://upload.wikimedia.org/wikipedia/commons/c/c4/Earthmap1000x500compac.jpg"
],
"scene3D": true
}
}, {
"id": 0,
"name": "MolniyaOrbit",
"availability": "2000-01-01T12:00:00Z/2000-01-01T23:59:35Z",
"position": {
"epoch": "2000-01-01T12:00:00.000",
"interpolationAlgorithm": "LAGRANGE",
"interpolationDegree": 5,
"referenceFrame": "INERTIAL",
"cartesian": [
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},
"billboard": {
"show": true,
"image": "data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1BAACxjwv8YQUAAAAJcEhZcwAADsMAAA7DAcdvqGQAAADJSURBVDhPnZHRDcMgEEMZjVEYpaNklIzSEfLfD4qNnXAJSFWfhO7w2Zc0Tf9QG2rXrEzSUeZLOGm47WoH95x3Hl3jEgilvDgsOQUTqsNl68ezEwn1vae6lceSEEYvvWNT/Rxc4CXQNGadho1NXoJ+9iaqc2xi2xbt23PJCDIB6TQjOC6Bho/sDy3fBQT8PrVhibU7yBFcEPaRxOoeTwbwByCOYf9VGp1BYI1BA+EeHhmfzKbBoJEQwn1yzUZtyspIQUha85MpkNIXB7GizqDEECsAAAAASUVORK5CYII="
},
"label": {
"text": "Molniya",
"font": "11pt Lucida Console",
"style": "FILL",
"fillColor": {
"rgba": [
125,
80,
120,
255
]
},
"outlineColor": {
"rgba": [
255,
255,
0,
255
]
},
"outlineWidth": 1.0
},
"path": {
"width": 2,
"resolution": 120,
"material": {
"solidColor": {
"color": {
"rgba": [
255,
255,
0,
255
]
}
}
}
}
}]
In [7]:
from poliastro.bodies import Mars
Of course, when defining a new attractor you want to be able to identify something other than it's shape. For this reason, the extractor allows you to easily set the UV map by simply providing a valid URL.
In [8]:
mars_uv = "https://upload.wikimedia.org/wikipedia/commons/f/fd/Mars_2020_LandingSites_Final_8-full.jpg"
In [9]:
extractor = CZMLExtractor(
start_epoch,
end_epoch,
N,
attractor=Mars,
pr_map=mars_uv
)
WARNING: AstropyDeprecationWarning: The truth value of a Quantity is ambiguous. In the future this will raise a ValueError. [astropy.units.quantity]
In [10]:
extractor.packets
Out[10]:
[{
"id": "document",
"version": "1.0",
"name": "document_packet",
"clock": {
"interval": "2000-01-01T12:00:00.000/2000-01-01T23:59:35.108",
"currentTime": "2000-01-01T12:00:00.000",
"multiplier": 60,
"range": "LOOP_STOP",
"step": "SYSTEM_CLOCK_MULTIPLIER"
}
}, {
"id": "custom_properties",
"properties": {
"custom_attractor": true,
"ellipsoid": [
{
"array": [
3396190.0,
3396190.0,
3376220.0
]
}
],
"map_url": "https://upload.wikimedia.org/wikipedia/commons/f/fd/Mars_2020_LandingSites_Final_8-full.jpg",
"scene3D": true
}
}]
Instead of a 3D globe you may want to visualize your orbit as a 2D projection instead. In this case you can simply set scene3D
to false
and Cesium will automatically render the scene's orthographic projection. This can be of use when plotting animated groundtracks as we'll see in the next section
In [11]:
extractor = CZMLExtractor(
start_epoch,
end_epoch,
N,
scene3D=False
)
In [12]:
extractor.packets
Out[12]:
[{
"id": "document",
"version": "1.0",
"name": "document_packet",
"clock": {
"interval": "2000-01-01T12:00:00.000/2000-01-01T23:59:35.108",
"currentTime": "2000-01-01T12:00:00.000",
"multiplier": 60,
"range": "LOOP_STOP",
"step": "SYSTEM_CLOCK_MULTIPLIER"
}
}, {
"id": "custom_properties",
"properties": {
"custom_attractor": true,
"ellipsoid": [
{
"array": [
6378136.6,
6378136.6,
6356751.9
]
}
],
"map_url": [
"https://upload.wikimedia.org/wikipedia/commons/c/c4/Earthmap1000x500compac.jpg"
],
"scene3D": false
}
}]
In [13]:
extractor = CZMLExtractor(
start_epoch,
end_epoch,
N
)
In [14]:
extractor.add_orbit(molniya,
groundtrack_show=True,
groundtrack_lead_time=20,
groundtrack_trail_time=20
)
In [15]:
extractor.packets
Out[15]:
[{
"id": "document",
"version": "1.0",
"name": "document_packet",
"clock": {
"interval": "2000-01-01T12:00:00.000/2000-01-01T23:59:35.108",
"currentTime": "2000-01-01T12:00:00.000",
"multiplier": 60,
"range": "LOOP_STOP",
"step": "SYSTEM_CLOCK_MULTIPLIER"
}
}, {
"id": "custom_properties",
"properties": {
"custom_attractor": true,
"ellipsoid": [
{
"array": [
6378136.6,
6378136.6,
6356751.9
]
}
],
"map_url": [
"https://upload.wikimedia.org/wikipedia/commons/c/c4/Earthmap1000x500compac.jpg"
],
"scene3D": true
}
}, {
"id": 0,
"availability": "2000-01-01T12:00:00Z/2000-01-01T23:59:35Z",
"position": {
"epoch": "2000-01-01T12:00:00.000",
"interpolationAlgorithm": "LAGRANGE",
"interpolationDegree": 5,
"referenceFrame": "INERTIAL",
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In [ ]:
Content source: Juanlu001/poliastro
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