public SpatialPrefixTree(SpatialContext ctx, int maxLevels) {assert maxLevels > 0;this.ctx = ctx;this.maxLevels = maxLevels;}
public SpatialPrefixTree(SpatialContext ctx, int maxLevels){Debug.Assert(maxLevels > 0);this.m_ctx = ctx;this.m_maxLevels = maxLevels;}