AI-generated Key Takeaways
-
The centroid method returns a point at the center of the highest-dimension components of a geometry, ignoring lower-dimensional components.
-
The
LineString.centroid()method returns a Geometry. -
The
maxErrorargument specifies the maximum error tolerated during reprojection, and theprojargument specifies the output projection. -
Examples are provided in both JavaScript and Python for calculating and displaying the centroid of a LineString.
| Usage | Returns |
|---|---|
LineString.
centroid
( maxError
, proj
)
|
Geometry |
| Argument | Type | Details |
|---|---|---|
|
this:
geometry
|
Geometry | Calculates the centroid of this geometry. |
maxError
|
ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |
proj
|
Projection, default: null | If specified, the result will be in this projection. Otherwise it will be in EPSG:4326. |
Examples
Code Editor (JavaScript)
// Define a LineString object. var lineString = ee . Geometry . LineString ([[ - 122.09 , 37.42 ], [ - 122.08 , 37.43 ]]); // Apply the centroid method to the LineString object. var lineStringCentroid = lineString . centroid ({ 'maxError' : 1 }); // Print the result to the console. print ( 'lineString.centroid(...) =' , lineStringCentroid ); // Display relevant geometries on the map. Map . setCenter ( - 122.085 , 37.422 , 15 ); Map . addLayer ( lineString , { 'color' : 'black' }, 'Geometry [black]: lineString' ); Map . addLayer ( lineStringCentroid , { 'color' : 'red' }, 'Result [red]: lineString.centroid' );
import ee import geemap.core as geemap
Colab (Python)
# Define a LineString object. linestring = ee . Geometry . LineString ([[ - 122.09 , 37.42 ], [ - 122.08 , 37.43 ]]) # Apply the centroid method to the LineString object. linestring_centroid = linestring . centroid ( maxError = 1 ) # Print the result. display ( 'linestring.centroid(...) =' , linestring_centroid ) # Display relevant geometries on the map. m = geemap . Map () m . set_center ( - 122.085 , 37.422 , 15 ) m . add_layer ( linestring , { 'color' : 'black' }, 'Geometry [black]: linestring' ) m . add_layer ( linestring_centroid , { 'color' : 'red' }, 'Result [red]: linestring.centroid' ) m
