AI-generated Key Takeaways
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This function transforms raster images into vector features by grouping similar pixel regions.
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Each generated feature represents a segment in the image and includes calculated statistics or properties.
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Users can customize the analysis by specifying the reducer function, geometry type, and scale.
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Advanced options allow control over connectivity, labeling, projection, and memory management for complex processing.
Either the reducer must have one fewer inputs than the image has bands, or it must have a single input and will be repeated for each band.
| Usage | Returns |
|---|---|
Image.reduceToVectors(reducer, geometry, scale, geometryType, eightConnected, labelProperty, crs, crsTransform, bestEffort, maxPixels, tileScale, geometryInNativeProjection) | FeatureCollection |
| Argument | Type | Details |
|---|---|---|
this: image | Image | The input image. The first band is expected to be an integer type; adjacent pixels will be in the same segment if they have the same value in this band. |
reducer | Reducer, default: null | The reducer to apply. Its inputs will be taken from the image's bands after dropping the first band. Defaults to Reducer.countEvery(). |
geometry | Geometry, default: null | The region over which to reduce data. Defaults to the footprint of the image's first band. |
scale | Float, default: null | A nominal scale in meters of the projection to work in. |
geometryType | String, default: "polygon" | How to choose the geometry of each generated feature; one of 'polygon' (a polygon enclosing the pixels in the segment), 'bb' (a rectangle bounding the pixels), or 'centroid' (the centroid of the pixels). |
eightConnected | Boolean, default: true | If true, diagonally-connected pixels are considered adjacent; otherwise only pixels that share an edge are. |
labelProperty | String, default: "label" | If non-null, the value of the first band will be saved as the specified property of each feature. |
crs | Projection, default: null | The projection to work in. If unspecified, the projection of the image's first band is used. If specified in addition to scale, rescaled to the specified scale. |
crsTransform | List, default: null | The list of CRS transform values. This is a row-major ordering of the 3x2 transform matrix. This option is mutually exclusive with 'scale', and replaces any transform already set on the projection. |
bestEffort | Boolean, default: false | If the polygon would contain too many pixels at the given scale, compute and use a larger scale which would allow the operation to succeed. |
maxPixels | Long, default: 10000000 | The maximum number of pixels to reduce. |
tileScale | Float, default: 1 | A scaling factor used to reduce aggregation tile size; using a larger tileScale (e.g., 2 or 4) may enable computations that run out of memory with the default. |
geometryInNativeProjection | Boolean, default: false | Create geometries in the pixel projection, rather than EPSG:4326. |