Transformer#

the cuproj.transformer module contains the Transformer class, which can perform 2D transformations between coordinate reference systems (CRS).

class cuproj.transformer.Transformer(crs_from, crs_to)#

Bases: object

A transformer object to transform coordinates from one CRS to another.

Notes

Currently only the EPSG authority is supported. Currently only projection from WGS84 to UTM (and vice versa) is supported.

Examples

>>> from cuproj import Transformer
>>> transformer = Transformer.from_crs("epsg:4326", "epsg:32631")
>>> transformer.transform(2, 49)
(500000.0, 5460836.5)
>>> transformer.transform(500000, 5460836.5, direction="INVERSE")
(2.0, 49.0)

Methods

`from_crs`(crs_from, crs_to)	Create a transformer from a source CRS to a target CRS.
`transform`(x, y[, direction])	Transform coordinates from one CRS to another.

static from_crs(crs_from, crs_to)#

Create a transformer from a source CRS to a target CRS.

Parameters

crs_fromCRS: The source CRS.
crs_toCRS: The target CRS.
Source and target CRS may be:
- An authority string [i.e. ‘epsg:4326’]
- An EPSG integer code [i.e. 4326]
- A tuple of (“auth_name”: “auth_code”) [i.e (‘epsg’, ‘4326’)]

Returns

Transformer: A transformer object to transform coordinates from one CRS to another.

Notes

Currently only the EPSG authority is supported.

transform(x, y, direction='FORWARD')#

Transform coordinates from one CRS to another.

If the input data is already in device memory, and the input implements __cuda_array_interface__ , the data will be used directly. If the data is in host memory, it will be copied to the device.

Parameters

xfloat or array_like: The x coordinate(s) to transform.
yfloat or array_like: The y coordinate(s) to transform.
directionstr, optional: The direction of the transformation. Either “FORWARD” or “INVERSE”. Default is “FORWARD”.

Returns

tuple: A tuple of transformed x and y coordinates as cupy (device) arrays.