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ee.Feature.length
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返回指定要素的几何图形中线性部分的长度。多边形部分会被忽略。多几何图形的长度是其组成部分的长度之和。
用法 | 返回 |
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Feature.length(maxError, proj) | 浮点数 |
参数 | 类型 | 详细信息 |
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此:feature | 元素 | 从中获取几何图形的要素。 |
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。否则将以米为单位。 |
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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\u003eThis function calculates the total length of linear geometries within a given feature, excluding any polygonal parts.\u003c/p\u003e\n"],["\u003cp\u003eFor features with multiple geometries, the function sums the lengths of each individual component to determine the overall length.\u003c/p\u003e\n"],["\u003cp\u003eResults are given in meters by default, but can be specified in the units of a provided projection.\u003c/p\u003e\n"],["\u003cp\u003eAn optional error margin can be specified for handling reprojection, if needed.\u003c/p\u003e\n"]]],["The `Feature.length()` method calculates the total length of linear components within a feature's geometry, excluding polygonal parts. It returns a float value representing this length. The method accepts optional `maxError` and `proj` arguments. `maxError` defines the acceptable error during reprojection, and `proj` specifies the desired coordinate system for the output, defaulting to meters if unspecified. The feature itself is mandatory for which the length is calculated.\n"],null,["# ee.Feature.length\n\nReturns the length of the linear parts of the geometry of a given feature. Polygonal parts are ignored. The length of multi geometries is the sum of the lengths of their components.\n\n\u003cbr /\u003e\n\n| Usage | Returns |\n|-------------------------------------------|---------|\n| Feature.length`(`*maxError* `, `*proj*`)` | Float |\n\n| Argument | Type | Details |\n|-----------------|----------------------------|----------------------------------------------------------------------------------------------------------------------------|\n| this: `feature` | Element | The feature from which the geometry is taken. |\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 meters. |"]]