Geometries

All geometries are specified in WGS84 (EPSG:4326) with coordinates in [longitude, latitude] order.

Point Geometry

{
  "type": "Point",
  "coordinates": [-0.13, 51.51],
  "radius": 500
}

Field	Type	Required	Description
`type`	`"Point"`	Yes	Fixed value
`coordinates`	`[lon, lat]`	Yes	Longitude (-180 to 180), latitude (-90 to 90)
`radius`	`float`	No	Buffer radius in meters. Must be non-negative

Point Behaviors

How a point is handled depends on radius:

Radius	Raster Behavior	Vector Behavior
Omitted or `null`	Samples the single pixel under the point	`touch` mode: unweighted stats on features at the point
`0`	Samples the single pixel under the point	`touch` mode: unweighted stats on features at the point
`> 0`	Buffers to polygon, runs zonal stats	`intersect` mode: area-weighted stats within the circle

Buffering

The buffer is computed in the appropriate UTM zone for the point's location, then transformed back to WGS84. This ensures accurate circular buffers in meters.

Polygon Geometry

{
  "type": "Polygon",
  "coordinates": [
    [[-0.16, 51.5], [-0.11, 51.5], [-0.11, 51.52], [-0.16, 51.52], [-0.16, 51.5]]
  ]
}

Field	Type	Required	Description
`type`	`"Polygon"`	Yes	Fixed value
`coordinates`	`float[][][]`	Yes	Array of linear rings. Outer ring required, holes optional

Rules

At least 3 distinct points per ring
The ring must be closed -- the first and last coordinate must be identical
Polygons always use intersect mode for vector queries (area-weighted)