# ExtractMapMetadataFromAnchor

Source: https://www.nianticspatial.com/docs/api/unity/NianticSpatial.NSDK.AR.Mapping.DeviceMapAccessController.ExtractMapMetadataFromAnchor/

ExtractMapMetadataFromAnchor
Extract the metadata from a map relative to an anchor on the map.

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## Declaration

public bool ExtractMapMetadataFromAnchor(string anchorPayload, byte[] mapData, out Vector3[] points, out float[] errors)

#### Summary

Extract the metadata from a map relative to an anchor on the map.

#### Returns

True if successful, false otherwise.

> **Info:**
>
> **Notice**
>
> This is an experimental feature, and is subject to breaking changes or deprecation without notice

### Parameters

| Name | Type | Summary |
| --- | --- | --- |
| anchorPayload | string | The anchor payload as a byte array. The returned map metadata will be relative to this anchor. |
| mapData | byte[] | The map to extract the metadata from. |
| points | Vector3[] | The positions of the feature points in the map. |
| errors | float[] | The error metric for each of the points in the map. |

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