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store the geopoint in three dimensions

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Tamo 2021-12-14 12:21:24 +01:00
parent 11a056d116
commit 98a365aaae
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5 changed files with 39 additions and 13 deletions
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17
milli/src/lib.rs
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@ -54,7 +54,11 @@ pub type FieldId = u16;
pub type Position = u32;
pub type RelativePosition = u16;
pub type FieldDistribution = BTreeMap<String, u64>;
pub type GeoPoint = rstar::primitives::GeomWithData<[f64; 2], DocumentId>;
/// A GeoPoint is a point in cartesian plan, called xyz_point in the code. Its metadata
/// is a tuple composed of 1. the DocumentId of the associated document and 2. the original point
/// expressed in term of latitude and longitude.
pub type GeoPoint = rstar::primitives::GeomWithData<[f64; 3], (DocumentId, [f64; 2])>;
pub const MAX_POSITION_PER_ATTRIBUTE: u32 = u16::MAX as u32 + 1;
@ -168,6 +172,17 @@ pub fn distance_between_two_points(a: &[f64; 2], b: &[f64; 2]) -> f64 {
a.haversine_distance_to(&b).meters()
}
/// Convert a point expressed in terms of latitude and longitude to a point in the
/// cartesian coordinate expressed in terms of x, y and z.
pub fn lat_lng_to_xyz(coord: &[f64; 2]) -> [f64; 3] {
let [lat, lng] = coord.map(|f| f.to_radians());
let x = lat.cos() * lng.cos();
let y = lat.cos() * lng.sin();
let z = lat.sin();
[x, y, z]
}
#[cfg(test)]
mod tests {
use serde_json::json;