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Clamp vector geometry latitudes for Mercator projection #266

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Clamp vector geometry latitudes for Mercator projection #266

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Clamp vector geometry latitudes for Mercator projection
frewsxcv Mar 9, 2026
eb657e1
Merge remote-tracking branch 'origin/main' into fix/clamp-vector-geom…
frewsxcv Mar 10, 2026
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21 changes: 19 additions & 2 deletions rgis-transform/src/jobs.rs
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Original file line number Diff line number Diff line change
@@ -1,7 +1,10 @@
use std::sync::Arc;
use geo::MapCoords;
use geo_projected::CastTo;
use geodesy::prelude::Context;

const MERCATOR_LAT_LIMIT: f64 = 85.06;

pub struct ReprojectRasterExtentJob {
pub extent: geo::Rect<f64>,
pub layer_id: rgis_primitives::LayerId,
Expand Down Expand Up @@ -41,7 +44,6 @@ impl bevy_jobs::Job for ReprojectRasterExtentJob {
if source_is_geographic {
let target_is_mercator = self.target_crs.is_mercator();
if target_is_mercator {
const MERCATOR_LAT_LIMIT: f64 = 85.06;
min.y = min.y.max(-MERCATOR_LAT_LIMIT);
max.y = max.y.min(MERCATOR_LAT_LIMIT);
}
Expand Down Expand Up @@ -198,9 +200,24 @@ impl bevy_jobs::Job for ReprojectGeometryJob {
}

async fn perform(self, progress_sender: bevy_jobs::Context) -> Self::Outcome {
let feature_collection = Arc::unwrap_or_clone(self.feature_collection);
let mut feature_collection = Arc::unwrap_or_clone(self.feature_collection);
let total = feature_collection.features.len();

// If projecting geographic coordinates to Mercator, clamp latitudes to
// ±85.06° to prevent near-pole vertices from producing extreme Y values.
if self.source_crs.is_geographic() && self.target_crs.is_mercator() {
for feature in &mut feature_collection.features {
if let Some(ref mut geom) = feature.geometry {
*geom = geom.map_coords(|coord| geo::Coord {
x: coord.x,
y: geo_projected::UnprojectedScalar::new(
coord.y.0.clamp(-MERCATOR_LAT_LIMIT, MERCATOR_LAT_LIMIT),
),
});
}
}
}

let mut feature_collection = feature_collection.cast::<geo_projected::Projected>();

for (i, feature) in feature_collection.features.iter_mut().enumerate() {
Expand Down
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