public double getPixelToleranceAtZoom(int zoom) {
      return zoom == config.maxzoomForRendering() ? pixelToleranceAtMaxZoom :
        ZoomFunction.applyAsDoubleOrElse(pixelTolerance, zoom, defaultPixelTolerance);
    }
Returns the simplification tolerance for lines and polygons in tile pixels at {@code zoom}.
planetiler-core/src/main/java/com/onthegomap/planetiler/FeatureCollector.java