Jeff Moe
parent
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README.md
298
README.md
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@ -20,153 +20,6 @@ And render it in this application:
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# See Also
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## Spacecruft
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Spacecruft:
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* https://spacecruft.org/spacecruft/gnss-earth
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* https://spacecruft.org/spacecruft/celestia
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## Celestia
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Upstream Celestia:
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* https://celestia.space/
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* https://github.com/CelestiaProject/Celestia
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## TLE Conversion
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TLE Conversion Spreadsheet:
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* https://www.classe.cornell.edu/~seb/celestia/hutchison/spreadsheets.html
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* https://www.classe.cornell.edu/~seb/celestia/hutchison/tle-xls.zip
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## Solar System Catalog
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*"Solar System Catalog" files are primarily used to define the objects which
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can be found in a stellar system, such as planets, moons, asteroids, comets,
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and spacecraft. They also have four other uses: they can define alternative
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surface textures, locations on or near an object, and orbital reference points.
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An SSC file can also edit objects which have been defined in other SSC catalog files.*
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Info on `.ssc` files:
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* https://www.classe.cornell.edu/~seb/celestia/creating-ssc-files.html
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* https://en.wikibooks.org/wiki/Celestia/SSC_File
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In Celestia name "Galileo" is used for the *other* spacecraft, not
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for the EU GNSS. So the name used in development here adds `-gnss`,
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ala, `galileo-gnss.ssc`, whereas the other GNSS don't.
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Example `.ssc` file contents:
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```
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"1997-035A" "Sol/Earth" {
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Class "spacecraft"
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# Mesh
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Radius 0.005
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EllipticalOrbit {
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Epoch 2459718.94467728
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Period 0.49859567
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SemiMajorAxis 26560.345
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Eccentricity 0.0057297
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Inclination 55.5062
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AscendingNode 156.8049
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ArgOfPericenter 51.2220
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MeanAnomaly 309.3262
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}
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Obliquity 55.5062
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EquatorAscendingNode 156.8049
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RotationOffset 80.2289
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# Orientation [ ]
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}
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```
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## Galileo
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Galileo 3D models are from the ESA:
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* https://gssc.esa.int/education/galileo3d/
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## TLE Sources
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Beidou (China)
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* https://celestrak.com/NORAD/elements/beidou.txt
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Galileo (Europe)
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* https://celestrak.com/NORAD/elements/galileo.txt
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Glonass (Russia)
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* https://celestrak.com/NORAD/elements/glo-ops.txt
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GNSS (All)
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* https://celestrak.com/NORAD/elements/gnss.txt
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GPS (USA)
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* https://celestrak.com/NORAD/elements/gps-ops.txt
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## Spice
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Spice TLE:
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"Evaluate NORAD two-line element data for earth orbiting spacecraft."
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* https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/spicelib/evsgp4.html
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## SGP4
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SPG4
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* https://pypi.org/project/sgp4/
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## Skyfield
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Skyfield
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* https://rhodesmill.org/skyfield/earth-satellites.html
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# 3D Models
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Celestia uses an old 3D proprietary format from an old 3D application in
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`.3ds` format. It also has it's own format `.cmod`.
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## 3D Model Conversion
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Recent versions of Blender don't export `.3ds` format. But old versions
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of Blender, such as 2.79b do work. Get an old version here:
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* https://download.blender.org/release/Blender2.79/
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Launch `blender`, import, export.
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```
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# Go to https://gssc.esa.int/education/galileo3d/
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# and download the Galileo_3D.zip file.
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# It generates a unique URL, afaict.
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unzip Galileo_3D.zip
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# Get old Blender
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wget https://download.blender.org/release/Blender2.79/blender-2.79b-linux-glibc219-x86_64.tar.bz2
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tar xf blender-2.79b-linux-glibc219-x86_64.tar.bz2
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cd blender-2.79b-linux-glibc219-x86_64
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./blender
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```
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Blender creates a new file on launch.
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Go to `File --> Import --> Wavefront (.obj)`.
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Import the file, such as `galileo.obj`.
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Go to `File --> Export --> 3D Studio (.3ds)`.
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Save the file, such as `galileo-gnss.3ds`.
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The `galileo-gnss.3ds` file created this way didn't render in Celestia. `:(`
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# Install celestia-gnss
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Install thusly.
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@ -201,23 +54,154 @@ sudo cp -a extras/galileo-gnss/ /usr/share/celestia/extras-standard/
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```
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# Issues
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`pyorbital` doesn't support geostationary orbits.
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It gives the error:
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`Deep space calculations not supported`
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# See Also
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I thought that was what `pyorbital` was for. It is mentioned in a
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bug report, but not in the docs. Hmm.
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## Spacecruft
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Spacecruft:
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See issue:
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* https://spacecruft.org/spacecruft/gnss-earth
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* https://github.com/pytroll/pyorbital/issues/71
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* https://spacecruft.org/spacecruft/celestia
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## Celestia
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Upstream Celestia:
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* https://celestia.space/
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* https://github.com/CelestiaProject/Celestia
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## TLE Conversion
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TLE Conversion Spreadsheet by Grant Hutchison from July 2003.
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* https://www.classe.cornell.edu/~seb/celestia/hutchison/spreadsheets.html
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* https://www.classe.cornell.edu/~seb/celestia/hutchison/tle-xls.zip
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## Solar System Catalog
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*"Solar System Catalog" files are primarily used to define the objects which
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can be found in a stellar system, such as planets, moons, asteroids, comets,
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and spacecraft. They also have four other uses: they can define alternative
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surface textures, locations on or near an object, and orbital reference points.
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An SSC file can also edit objects which have been defined in other SSC catalog files.*
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Info on `.ssc` files:
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* https://www.classe.cornell.edu/~seb/celestia/creating-ssc-files.html
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* https://en.wikibooks.org/wiki/Celestia/SSC_File
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In Celestia name "Galileo" is used for the *other* spacecraft, not
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for the EU GNSS. So the name used in development here adds `-gnss`,
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ala, `galileo-gnss.ssc`, whereas the other GNSS don't.
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Example `.ssc` file contents:
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```
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I think the Deep space error comes when trying to use TLEs for computing
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geostationary or deep space orbits, with pyorbital doesn't support yet.
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"1997-035A" "Sol/Earth" {
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Class "spacecraft"
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# Mesh
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Radius 0.005
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EllipticalOrbit {
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Epoch 2459718.94467728
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Period 0.49859567
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SemiMajorAxis 26560.345
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Eccentricity 0.0057297
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Inclination 55.5062
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AscendingNode 156.8049
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ArgOfPericenter 51.2220
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MeanAnomaly 309.3262
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}
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Obliquity 55.5062
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EquatorAscendingNode 156.8049
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RotationOffset 80.2289
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# Orientation [ ]
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}
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```
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## TLE Sources
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Beidou (China)
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* https://celestrak.com/NORAD/elements/beidou.txt
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Galileo (Europe)
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* https://celestrak.com/NORAD/elements/galileo.txt
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Glonass (Russia)
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* https://celestrak.com/NORAD/elements/glo-ops.txt
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GNSS (All)
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* https://celestrak.com/NORAD/elements/gnss.txt
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GPS (USA)
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* https://celestrak.com/NORAD/elements/gps-ops.txt
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## Spice
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Spice TLE:
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"Evaluate NORAD two-line element data for earth orbiting spacecraft."
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* https://naif.jpl.nasa.gov/pub/naif/toolkit_docs/FORTRAN/spicelib/evsgp4.html
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## SGP4
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SPG4
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* https://pypi.org/project/sgp4/
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## Skyfield
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Skyfield
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* https://rhodesmill.org/skyfield/earth-satellites.html
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# 3D Models
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Celestia uses an old 3D proprietary format from an old 3D application in
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`.3ds` format. It also has it's own format `.cmod`.
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## Galileo
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Galileo 3D models are from the ESA:
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* https://gssc.esa.int/education/galileo3d/
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## 3D Model Conversion
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Recent versions of Blender don't export `.3ds` format. But old versions
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of Blender, such as 2.79b do work. Get an old version here:
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* https://download.blender.org/release/Blender2.79/
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Launch `blender`, import, export.
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```
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# Go to https://gssc.esa.int/education/galileo3d/
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# and download the Galileo_3D.zip file.
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# It generates a unique URL, afaict.
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unzip Galileo_3D.zip
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# Get old Blender
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wget https://download.blender.org/release/Blender2.79/blender-2.79b-linux-glibc219-x86_64.tar.bz2
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tar xf blender-2.79b-linux-glibc219-x86_64.tar.bz2
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cd blender-2.79b-linux-glibc219-x86_64
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./blender
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```
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Blender creates a new file on launch.
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Go to `File --> Import --> Wavefront (.obj)`.
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Import the file, such as `galileo.obj`.
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Go to `File --> Export --> 3D Studio (.3ds)`.
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Save the file, such as `galileo-gnss.3ds`.
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The `galileo-gnss.3ds` file created this way didn't render in Celestia. `:(`
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# Status
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Alpha, under development.
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# License / Copyright
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Upstream sources under their respective copyrights.
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