Methods
static Cesium.Analysis.addAccessLines(viewer, from, to, id, material) → string
| Name |
Type |
Default |
Description |
viewer |
Object
|
|
The viewer instance. |
from |
Entity
|
Array.<Entity>
|
|
The starting entity or array of starting entities. |
to |
Entity
|
Array.<Entity>
|
|
The ending entity or array of ending entities. |
id |
string
|
Date.now().toString()
|
optional
The id for the group of lines. |
material |
Material
|
|
optional
An optional custom material. Defaults to lime green if not provided. |
Returns:
- The id of the created access line group.
static Cesium.Analysis.azEl2RaDec(azDeg, elDeg, latDeg, lonDeg, julianDate, useNoonEpoch) → Object
| Name |
Type |
Default |
Description |
azDeg |
number
|
|
Azimuth (clockwise from north) [degrees]. |
elDeg |
number
|
|
Elevation above horizon [degrees]. |
latDeg |
number
|
|
WGS84 latitude [degrees]. |
lonDeg |
number
|
|
WGS84 longitude [degrees], east positive. |
julianDate |
Object
|
|
UT1-based Julian Date object. |
useNoonEpoch |
boolean
|
true
|
optional
Use Vallado's noon-based GMST offsets if true. |
Returns:
Right ascension and declination [degrees].
static Cesium.Analysis.calculateAccess(fromEntity, toEntity, startDate, endDate, stepSize, highResolution) → Promise.<Array.<TimeInterval>>
| Name |
Type |
Default |
Description |
fromEntity |
Object
|
|
The source entity with a position property. |
toEntity |
Object
|
|
The target entity with a position property. |
startDate |
JulianDate
|
|
The start date of the access computation. |
endDate |
JulianDate
|
|
The end date of the access computation. |
stepSize |
number
|
|
The time step (in seconds) between each access computation. |
highResolution |
boolean
|
false
|
optional
If true, uses a higher resolution computation. |
Returns:
- A promise that resolves to an array of `TimeInterval` objects
representing the access windows.
Throws:
static Cesium.Analysis.calculateMeanElements(id, apogee, perigee, inclination, raan, argp, mean_anomaly, bstar, epoch) → Promise.<Object>
Calculates the mean orbital elements and validates them using the SGP4 model.
| Name |
Type |
Description |
id |
number
|
The unique identifier for the satellite. If not provided, the current timestamp will be used. |
apogee |
number
|
The apogee of the orbit in kilometers. |
perigee |
number
|
The perigee of the orbit in kilometers. |
inclination |
number
|
The inclination of the orbit in radians. |
raan |
number
|
The right ascension of the ascending node in radians. |
argp |
number
|
The argument of perigee in radians. |
mean_anomaly |
number
|
The mean anomaly in radians. |
bstar |
number
|
The drag term. |
epoch |
string
|
optional
The epoch time in ISO 8601 format. If not provided, the current time will be used. |
Returns:
- A promise that resolves to an object containing the mean orbital elements.
static Cesium.Analysis.computeGMST(julianDate, unit, useNoonEpoch) → number
| Name |
Type |
Default |
Description |
julianDate |
Object
|
|
An object with two properties: |
unit |
string
|
'seconds'
|
optional
The unit for the returned GMST.
Valid options:
- `"seconds"`: Returns GMST in [0, 86400).
- `"degrees"`: Returns GMST in [0, 360). |
useNoonEpoch |
boolean
|
false
|
optional
Whether to use the noon-based epoch. |
Returns:
GMST in the specified unit.
Properties:
| Name |
Type |
Description |
dayNumber |
number
|
The integer Julian day (often at midnight). |
secondsOfDay |
number
|
The number of seconds past `dayNumber`. |
static Cesium.Analysis.computeLST(julianDate, longitudeDegrees, unit, useNoonEpoch) → number
| Name |
Type |
Default |
Description |
julianDate |
Object
|
|
An object with two properties: |
longitudeDegrees |
number
|
|
The observer's longitude in degrees (east positive). |
unit |
string
|
'seconds'
|
optional
The unit of measure for the returned LST.
Valid options:
- `"seconds"`: Returns LST in the range [0, 86400).
- `"degrees"`: Returns LST in the range [0, 360). |
useNoonEpoch |
boolean
|
false
|
optional
Whether to use the noon-based epoch
for GMST calculations. |
Returns:
LST in the specified unit.
Properties:
| Name |
Type |
Description |
dayNumber |
number
|
The integer Julian day (often at midnight). |
secondsOfDay |
number
|
The number of seconds past `dayNumber`. |
| Name |
Type |
Description |
julianDate |
JulianDate
|
An object with two properties: |
Returns:
T_UT1, the number of Julian centuries since J2000.0 (UT1 basis).
Properties:
| Name |
Type |
Description |
dayNumber |
number
|
The integer Julian day (often at midnight). |
secondsOfDay |
number
|
The number of seconds past `dayNumber`. |
Returns:
static Cesium.Analysis.raDec2AzEl(raDeg, decDeg, latDeg, lonDeg, julianDate, useNoonEpoch) → Object
Converts right ascension/declination to azimuth/elevation, matching
Vallado's "algorithm 28":
LHA = LST - RA
el = asin( sin(lat)*sin(dec) + cos(lat)*cos(dec)*cos(LHA) )
az = atan2( -sin(LHA)*cos(dec)/cos(el), ( sin(dec)-sin(el)*sin(lat) ) / (cos(el)*cos(lat)) )
| Name |
Type |
Default |
Description |
raDeg |
number
|
|
Right ascension [degrees]. |
decDeg |
number
|
|
Declination [degrees]. |
latDeg |
number
|
|
WGS84 latitude [degrees]. |
lonDeg |
number
|
|
WGS84 longitude [degrees], east positive. |
julianDate |
Object
|
|
UT1-based Julian Date object. |
useNoonEpoch |
boolean
|
true
|
optional
Use Vallado's noon-based GMST offsets if true. |
Returns:
Azimuth [0..360), Elevation [−90..90].
| Name |
Type |
Description |
viewer |
Object
|
The viewer instance. |
id |
string
|
The id of the access line group to remove. |
Returns:
