Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Added sat:anx_start_offset and sat:anx_end_offset fields #9

Closed
wants to merge 1 commit into from
+49 −11
Closed

Added sat:anx_start_offset and sat:anx_end_offset fields #9

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Loading
Jump to
Jump to file
Failed to load files.
Loading
Diff view
Diff view
1 change: 1 addition & 0 deletions CHANGELOG.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -9,6 +9,7 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
### Added

- Added `orbit_cycle` field ([#6](https://github.com/stac-extensions/sat/issues/6))
- Added `sat:anx_start_offset` and `sat:anx_end_offset` fields

### Changed

Expand Down
18 changes: 11 additions & 7 deletions README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -21,17 +21,21 @@ It will often be combined with other extensions that describe the actual data, s

## Item Properties

| Field Name | Type | Description |
| ------------------------------------- | ------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| sat:platform_international_designator | string | The International Designator, also known as COSPAR ID, and NSSDCA ID |
| sat:orbit_state | string | The state of the orbit. Either `ascending` or `descending` for polar orbiting satellites, or `geostationary` for geosynchronous satellites |
| sat:absolute_orbit | integer | The absolute orbit number at the time of acquisition. |
| sat:relative_orbit | integer | The relative orbit number at the time of acquisition. |
| sat:anx_datetime | string | The [Ascending Node](https://en.wikipedia.org/wiki/Orbital_node) Crossing (ANX) time, in UTC. It is formatted according to [RFC 3339, section 5.6](https://tools.ietf.org/html/rfc3339#section-5.6). |
| Field Name | Type | Description |
| ------------------------------------- | ------- | ------------------------------------------------------------ |
| sat:platform_international_designator | string | The International Designator, also known as COSPAR ID, and NSSDCA ID |
| sat:orbit_state | string | The state of the orbit. Either `ascending` or `descending` for polar orbiting satellites, or `geostationary` for geosynchronous satellites |
| sat:absolute_orbit | integer | The absolute orbit number at the time of acquisition. |
| sat:relative_orbit | integer | The relative orbit number at the time of acquisition. |
| sat:orbit_cycle | integer | The number of repeat cycle done by the satellite at the time of the acquisition. [Repeat cycle](https://ltb.itc.utwente.nl/page/498/concept/81577) is the time between two successive identical orbits. |
| sat:anx_datetime | string | The [Ascending Node](https://en.wikipedia.org/wiki/Orbital_node) Crossing (ANX) time, in UTC. It is formatted according to [RFC 3339, section 5.6](https://tools.ietf.org/html/rfc3339#section-5.6). |
| sat:anx_start_offset | number | The time before the satellite reaches the ANX, in seconds. More fine-grained granularity can be expressed through additional decimal places. |
| sat:anx_end_offset | number | The time after the satellite crosses the ANX, in seconds. More fine-grained granularity can be expressed through additional decimal places. |

*At least one of the fields must be specified.*

`sat:anx_datetime` is required if `sat:anx_start_offset` and/or `sat:anx_end_offset` are provided.

### Additional Field Information

#### sat:platform_international_designator
Expand Down
41 changes: 37 additions & 4 deletions json-schema/schema.json
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -126,21 +126,54 @@
"type": "integer",
"minimum": 1
},
"sat:orbit_cycle": {
"type": "integer",
"minimum": 1
},
"sat:anx_datetime": {
"type": "string",
"format": "date-time"
},
"sat:orbit_cycle": {
"type": "integer",
"minimum": 1
"sat:anx_start_offset": {
"type": "number",
"minimum": 0
},
"sat:anx_end_offset": {
"type": "number",
"minimum": 0
}
},
"patternProperties": {
"^(?!sat:)": {
"$comment": "Do not allow unspecified fields prefixed with sat:"
}
},
"additionalProperties": false
"additionalProperties": false,
"if": {
"oneOf": [
{
"required": [
"sat:anx_start_offset"
],
"properties": {
"sat:anx_start_offset": {}
}
},
{
"required": [
"sat:anx_end_offset"
],
"properties": {
"sat:anx_end_offset": {}
}
}
]
},
"then": {
"required": [
"sat:anx_datetime"
]
}
}
}
}
Loading