LanguageValues and typesStandard typesGeospatial
Crs
On this page
A coordinate reference system, by its EPSG code: EPSG:27700.
Use it to record which map system a set of coordinates is in, as EastingNorthing does. Point is always in EPSG:4326, so it needs no Crs.
Shape
One value, held as text in one set form, with no parts: EPSG:3857.
Example
Crs("EPSG:27700")Crs(raw) checks the text, and text that isn't one breaks the format rule.
text.parse(raw, as: Crs) reads one from text that comes from outside. Text that isn't one at all fails malformed, such as epsg:4326, EPSG: or EPSG:04326.
Good to know
EPSGis in capitals, with no space.==tells you whether two are the same.<andlist.sort_bydon't take it.
In JSON
A string, in a request, a response or json.write:
"EPSG:4326""EPSG:27700""EPSG:3857"
Details
Text form, storage, how it is shown, and operations
Crs is in the group Geospatial, and has been in Jadpo since 0.1.0.
Text form
text.from writes one standard text form, the same form text.parse reads back: EPSG:4326, EPSG:27700 and EPSG:3857.
How it is stored
It is stored in one column named for the field, of type text. EPSG:27700 is stored as 'EPSG:27700'.
How it is shown to people
text.format(value, locale:) shows it to people in their locale.
With locale: Locale.en_gb:
| Value | Shown |
|---|---|
EPSG:4326 |
EPSG:4326 |
EPSG:27700 |
EPSG:27700 |
EPSG:3857 |
EPSG:3857 |
Operations
It also takes text.parse, text.from, text.format, json.read, json.write and ==. How every standard type behaves says how they work.
Markdown for agents: /docs/types/type-crs.md.Built from Jadpo main at aee2e8f.