Object Attributes🍋

`ObjectAttribute` 🍋

Bases: Entity

Base class holding elements information/meta-data defining object attributes. It does not hold the attribute data directly but simply points to the database to retrieve it dynamically so that the values are always up-to-date.

An attribute can be either static or dynamic, i-e its value will be recomputed according to the defined expression/condition each time. Therefore it is not valid to have a dynamic attribute without expression.

An ObjectAttribute requires a parent ObjectDB, it is therefore not advised to instantiate any descendant of this class directly. Object attribute creation should be done through the GeoRefObject instead.

Parameters:

Name	Type	Description	Default
`db`	`ObjectDB`	reference ObjectDB to get data from.	required
`name`	`str`	attribute name.	required
`expr`	`Optional[str]`	attribute is computed as a condition or expression of other attributes.	`None`
`dynamic`	`bool`	attributes values are recomputed each time the data is requested. expr must be defined if attribute is dynamic.	`False`
`read_only`	`bool`	attribute data is protected.	`False`

Raises:

Type	Description
`ValueError`	ObjectDB or name is not provided. Attribute is dynamic but expr is not provided.

Attributes:

Name	Type	Description
`name`	`str`	name of the attribute.
`expr`	`str`	expression or condition to compute the attribute data.
`dynamic`	`bool`	if True, data is recomputed by ObjectDB each time it is accessed.
`read_only`	`bool`	whether the attribute is considered read-only.

`dynamic: bool` `property` `writable` 🍋

Return whether the attribute is dynamic, i-e. its data is recomputed using the provided expression.

Returns:

Type	Description
`bool`	True if dynamic, False otherwise.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.dynamic

Output

False

`expr: str` `property` 🍋

Return the attribute expression if provided at creation, otherwise None.

Returns:

Type	Description
`str`	Attribute expression.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
point_cloud.set_property_expr('XYZ', 'X * Y * Z', False)
prop_xyz = point_cloud.property("XYZ")
prop_xyz.expr

Output

'X * Y * Z'

`name: str` `property` 🍋

Return the attribute name.

Returns:

Type	Description
`str`	Attribute name.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.name

Output

'X'

`read_only: bool` `property` `writable` 🍋

Return whether the attribute is read-only, i-e. its data is protected.

Returns:

Type	Description
`bool`	True if read-only, False otherwise.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.read_only

Output

False

`data(region=None)` 🍋

Return the data associated to this attribute. If dynamic, the data will be recomputed first according to its provided expression.

Parameters:

Name	Type	Description	Default
`region`	`str`	Region or condition to filter data.	`None`

Returns:

Type	Description
`ndarray`	Underlying attribute data array.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.data()

Output

array([ 0,  3,  6,  9, 12, 15, 18, 21, 24, 27])

`ObjectGISRepresentation` 🍋

Bases: ObjectDB

Geometrical database for spatially represented objects (see GISObject). This database is specific to handle spatial data (see geopandas.GeoDataFrame) and therefore must be provided when instantiating it.

`crs: CRS` `property` 🍋

Return CRS.

Returns:

Type	Description
`CRS`	Coordinate Reference System.

`overlay(other_gis_repr, **kwargs)` 🍋

Perform spatial overlay between two ObjectGISRepresentation.

Allowed kwargs are GeoPandas overlay function arguments. See GeoPandas - Overlay.

Parameters:

Name	Type	Description	Default
`other_gis_repr`	`ObjectGISRepresentation`	ObjectGISRepresentation.	required

Returns:

Type	Description
`GeoDataFrame`	New GeoDataFrame.

`plot(interactive_map=False, interactive_max_sample=5000, **kwargs)` 🍋

Display the data on a regular plot or an interactive map.

Notes

interactive map requires folium and mapclassify packages to be installed.
a CRS must be defined for the data to be properly plotted. If the data doesn't have a CRS, the Project CRS will be used by default. See Project.
interactive map works within a Jupyter Notebook context, please see folium for more information.

Parameters:

Name	Type	Description	Default
`interactive_map`	`bool`	if True, `folium` interactive map is used.	`False`
`interactive_max_sample`	`int`	maximum number of samples to display in interactive mode. Above 10 000 samples, loading time and interactivity will be impacted.	`5000`
`**kwargs`		extra arguments to pass to GeoPandas - Plot or GeoPandas - Explore.	`{}`

Returns:

Type	Description
`Union[Axes, Map]`	A folium Map in interactive mode, or an instance of Matplotlib Axes otherwise.

Raises:

Type	Description
`ValueError`	Packages are missing for interactive mode.

`set_crs(crs)` 🍋

Set the Coordinate Reference System (CRS) of the GISObject.

Parameters:

Name	Type	Description	Default
`crs`	`CRS`	PyProj CRS.	required

`to_geojson(filename)` 🍋

Export the geometry to a geojson.

Parameters:

Name	Type	Description	Default
`filename`	`str`	path to export the file to.	required

`to_shp(filename)` 🍋

Export the geometry to a shpfile.

Parameters:

Name	Type	Description	Default
`filename`	`str`	path to export the file to.	required

`ObjectProperty` 🍋

Bases: ObjectAttribute

Property attribute class. See ObjectAttribute for more information.

Parameters:

Name	Type	Description	Default
`db`	`ObjectDB`	reference ObjectDB to get data from.	required
`name`	`str`	property name.	required
`kind`	`Optional[PropertyKind]`	property kind, see PropertyKind enum for more available kind.	`None`
`unit`	`Optional[Unit]`	property unit, see Unit in pint for more information.	`None`
`expr`	`Optional[str]`	property is computed as an expression of other attributes.	`None`
`dynamic`	`bool`	attributes values are recomputed each time the data is requested. expr must be defined if property is dynamic.	`False`
`read_only`	`bool`	attribute data is protected.	`False`

Raises:

Type	Description
`ValueError`	ObjectDB or name is not provided. Property is dynamic but expr is not provided.

Attributes:

Name	Type	Description
`kind`	`PropertyKind`	property kind if defined, otherwise None.
`unit`	`Unit`	property unit if defined, otherwise None.

`kind: PropertyKind` `property` `writable` 🍋

Return the kind associated to the property if any, None otherwise.

Returns:

Type	Description
`PropertyKind`	Property kind.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.kind

Output

<PropertyKind.GEOMETRY: 'GEOMETRY'>

`unit: Unit` `property` `writable` 🍋

Return the unit associated to the property if any, None otherwise.

Returns:

Type	Description
`Unit`	Pint Unit.

Example

import geolime as geo
import numpy as np
xyz = np.arange(30).reshape(10, 3)
point_cloud = geo.PointCloud("MyPointCloud", xyz)
prop_x = point_cloud.property("X")
prop_x.unit

Output

<Unit('meter')>

`ObjectRegion` 🍋

Bases: ObjectAttribute

Region attribute class. See ObjectAttribute for more information.

Parameters:

Name	Type	Description	Default
`db`	`ObjectDB`	reference ObjectDB to get data from.	required
`name`	`str`	region name.	required
`condition`	`Optional[str]`	region is computed as a condition of other attributes.	`None`
`dynamic`	`bool`	attributes values are recomputed each time the data is requested. expr must be defined if property is dynamic.	`False`
`read_only`	`bool`	attribute data is protected.	`False`

Raises:

Type	Description
`ValueError`	ObjectDB or name is not provided. Region is dynamic but expr is not provided.

Last update: 2022-11-03

Object Attributes🍋