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ee.Geometry.Polygon.area
使用集合让一切井井有条
根据您的偏好保存内容并对其进行分类。
返回几何图形的面积。点和线串的面积为 0,而多重几何图形的面积是其组成部分的面积之和(相交的面积会多次计算)。
用法 | 返回 |
---|
Polygon.area(maxError, proj) | 浮点数 |
参数 | 类型 | 详细信息 |
---|
此:geometry | 几何图形 | 几何图形输入。 |
maxError | ErrorMargin,默认值:null | 执行任何必要的重新投影时可容忍的最大误差量。 |
proj | 投影,默认值:null | 如果指定,结果将采用相应投影的坐标系的单位。否则将以平方米为单位。 |
示例
代码编辑器 (JavaScript)
// Define a Polygon object.
var polygon = ee.Geometry.Polygon(
[[[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423]]]);
// Apply the area method to the Polygon object.
var polygonArea = polygon.area({'maxError': 1});
// Print the result to the console.
print('polygon.area(...) =', polygonArea);
// Display relevant geometries on the map.
Map.setCenter(-122.085, 37.422, 15);
Map.addLayer(polygon,
{'color': 'black'},
'Geometry [black]: polygon');
Python 设置
如需了解 Python API 和如何使用 geemap
进行交互式开发,请参阅
Python 环境页面。
import ee
import geemap.core as geemap
Colab (Python)
# Define a Polygon object.
polygon = ee.Geometry.Polygon([[
[-122.092, 37.424],
[-122.086, 37.418],
[-122.079, 37.425],
[-122.085, 37.423],
]])
# Apply the area method to the Polygon object.
polygon_area = polygon.area(maxError=1)
# Print the result.
display('polygon.area(...) =', polygon_area)
# Display relevant geometries on the map.
m = geemap.Map()
m.set_center(-122.085, 37.422, 15)
m.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')
m
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最后更新时间 (UTC):2025-07-26。
[null,null,["最后更新时间 (UTC):2025-07-26。"],[[["\u003cp\u003eCalculates the area of a given geometry, returning the result as a float.\u003c/p\u003e\n"],["\u003cp\u003ePoints and line strings have an area of 0, while the area of multi-geometries is the sum of their component areas.\u003c/p\u003e\n"],["\u003cp\u003eThe \u003ccode\u003emaxError\u003c/code\u003e argument controls the error tolerance during reprojection, and \u003ccode\u003eproj\u003c/code\u003e specifies the output projection for the area calculation.\u003c/p\u003e\n"],["\u003cp\u003eIf \u003ccode\u003eproj\u003c/code\u003e is not specified, the area is calculated in square meters.\u003c/p\u003e\n"]]],["The `area()` method calculates the area of a geometry, returning a float value. Points and line strings have an area of 0. Multi-geometries' areas are the sum of their component areas. The method accepts optional `maxError` for reprojection tolerance and `proj` to specify the output's coordinate system, defaulting to square meters. The provided examples demonstrate calculating and displaying the area of a polygon using both JavaScript and Python.\n"],null,["# ee.Geometry.Polygon.area\n\nReturns the area of the geometry. Area of points and line strings is 0 and the area of multi geometries is the sum of the areas of their components (intersecting areas are counted multiple times).\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-----------------------------------------|---------|\n| Polygon.area`(`*maxError* `, `*proj*`)` | Float |\n\n| Argument | Type | Details |\n|------------------|----------------------------|-----------------------------------------------------------------------------------------------------------------------------------|\n| this: `geometry` | Geometry | The geometry input. |\n| `maxError` | ErrorMargin, default: null | The maximum amount of error tolerated when performing any necessary reprojection. |\n| `proj` | Projection, default: null | If specified, the result will be in the units of the coordinate system of this projection. Otherwise it will be in square meters. |\n\nExamples\n--------\n\n### Code Editor (JavaScript)\n\n```javascript\n// Define a Polygon object.\nvar polygon = ee.Geometry.Polygon(\n [[[-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423]]]);\n\n// Apply the area method to the Polygon object.\nvar polygonArea = polygon.area({'maxError': 1});\n\n// Print the result to the console.\nprint('polygon.area(...) =', polygonArea);\n\n// Display relevant geometries on the map.\nMap.setCenter(-122.085, 37.422, 15);\nMap.addLayer(polygon,\n {'color': 'black'},\n 'Geometry [black]: polygon');\n```\nPython setup\n\nSee the [Python Environment](/earth-engine/guides/python_install) page for information on the Python API and using\n`geemap` for interactive development. \n\n```python\nimport ee\nimport geemap.core as geemap\n```\n\n### Colab (Python)\n\n```python\n# Define a Polygon object.\npolygon = ee.Geometry.Polygon([[\n [-122.092, 37.424],\n [-122.086, 37.418],\n [-122.079, 37.425],\n [-122.085, 37.423],\n]])\n\n# Apply the area method to the Polygon object.\npolygon_area = polygon.area(maxError=1)\n\n# Print the result.\ndisplay('polygon.area(...) =', polygon_area)\n\n# Display relevant geometries on the map.\nm = geemap.Map()\nm.set_center(-122.085, 37.422, 15)\nm.add_layer(polygon, {'color': 'black'}, 'Geometry [black]: polygon')\nm\n```"]]