- accuracy: String of integer meters; locations less accurate than this are ignored
- coordinates: String "true" if coordinates required in result
- image: String "true" if image file path required in result
- interval_meters: String of integer meters; new location less than this far away from the previous location will be ignored
- interval_millis: String of integer milliseconds; new location less than this much newer than previous location will be ignored
- area: String of double square meters; area of measured land
- perimeter: String of double meters; perimeter length of measured land
- coordinates: (may be absent) String of lat/lng doubles; perimeter coordinates of measured land
- image: (may be absent) String of file path: path to saved image of land map