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astronomy-1.0.0.yaml
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id: asdf://asdf-format.org/astronomy/manifests/astronomy-1.0.0
extension_uri: asdf://asdf-format.org/astronomy/extensions/astronomy-1.0.0
title: ASDF astronomy extension 1.0.0
description: Astronomy related (non-core) ASDF objects
asdf_standard_requirement:
gte: 1.6.0
tags:
- tag_uri: tag:stsci.edu:asdf/table/column-1.1.0
schema_uri: http://stsci.edu/schemas/asdf/table/column-1.1.0
title: A column in a table.
description: |-
Each column contains a name and an array of data, and an optional description
and unit.
- tag_uri: tag:stsci.edu:asdf/unit/defunit-1.0.0
schema_uri: http://stsci.edu/schemas/asdf/unit/defunit-1.0.0
title: Define a new physical unit.
description: |-
Defines a new unit. It can be used to either:
- Define a new base unit.
- Create a new unit name that is a equivalent to a given unit.
The new unit must be defined before any unit tags that use it.
- tag_uri: tag:stsci.edu:asdf/fits/fits-1.1.0
schema_uri: http://stsci.edu/schemas/asdf/fits/fits-1.1.0
title: A FITS file inside of an ASDF file.
description: |-
This schema is useful for distributing ASDF files that can
automatically be converted to FITS files by specifying the exact
content of the resulting FITS file.
Not all kinds of data in FITS are directly representable in ASDF.
For example, applying an offset and scale to the data using the
`BZERO` and `BSCALE` keywords. In these cases, it will not be
possible to store the data in the native format from FITS and also
be accessible in its proper form in the ASDF file.
Only image and binary table extensions are supported.
- tag_uri: tag:stsci.edu:asdf/unit/quantity-1.2.0
schema_uri: http://stsci.edu/schemas/asdf/unit/quantity-1.2.0
title: Represents a Quantity object from astropy
description: |-
A Quantity object represents a value that has some unit
associated with the number.
- tag_uri: tag:stsci.edu:asdf/table/table-1.1.0
schema_uri: http://stsci.edu/schemas/asdf/table/table-1.1.0
title: A table.
description: |-
A table is represented as a list of columns, where each entry is a
[column](ref:table/column-1.1.0)
object, containing the data and some additional information.
The data itself may be stored inline as text, or in binary in either
row- or column-major order by use of the `strides` property on the
individual column arrays.
Each column in the table must have the same first (slowest moving)
dimension.
- tag_uri: tag:stsci.edu:asdf/time/time-1.2.0
schema_uri: http://stsci.edu/schemas/asdf/time/time-1.2.0
title: Represents an instance in time.
description: |-
A "time" is a single instant in time. It may explicitly specify the
way time is represented (the "format") and the "scale" which
specifies the offset and scaling relation of the unit of time.
Specific emphasis is placed on supporting time scales (e.g. UTC,
TAI, UT1, TDB) and time representations (e.g. JD, MJD, ISO 8601)
that are used in astronomy and required to calculate, e.g., sidereal
times and barycentric corrections.
Times may be represented as one of the following:
- an object, with explicit `value`, and optional `format`, `scale`
and `location`.
- a string, in which case the format is guessed from across
the unambiguous options (`iso`, `byear`, `jyear`, `yday`), and the
scale is hardcoded to `UTC`.
In either case, a single time tag may be used to represent an
n-dimensional array of times, using either an `ndarray` tag or
inline as (possibly nested) YAML lists. If YAML lists, the same
format must be used for all time values.
The precision of the numeric formats should only be assumed to be as
good as an IEEE-754 double precision (float64) value. If
higher-precision is required, the `iso` or `yday` format should be
used.
- tag_uri: tag:stsci.edu:asdf/unit/unit-1.0.0
schema_uri: http://stsci.edu/schemas/asdf/unit/unit-1.0.0
title: Physical unit.
description: |-
This represents a physical unit, in [VOUnit syntax, Version 1.0](http://www.ivoa.net/documents/VOUnits/index.html).
Where units are not explicitly tagged, they are assumed to be in VOUnit syntax.