---
title: "CoveringTilesOptionsInternal | JavaScript maps SDK"
description: "Documentation for MapTiler SDK"
---

> For AI agents: a documentation index is available at [/llms.txt](https://docs.maptiler.com/llms.txt). Markdown versions of all pages are available by appending .md to any URL.

# Type Alias CoveringTilesOptionsInternal

CoveringTilesOptionsInternal: [CoveringTilesOptions](https://docs.maptiler.com/sdk-js/api-reference/types/CoveringTilesOptions/) & {  
    calculateTileZoom?: [CalculateTileZoomFunction](https://docs.maptiler.com/sdk-js/api-reference/types/CalculateTileZoomFunction/);  
    reparseOverscaled?: boolean;  
    terrain?: [Terrain](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.Terrain/);  
}

#### Type Declaration

-   ##### `Optional`calculateTileZoom?: [CalculateTileZoomFunction](https://docs.maptiler.com/sdk-js/api-reference/types/CalculateTileZoomFunction/)
    
    Optional function to redefine how tiles are loaded at high pitch angles.
    
-   ##### `Optional`reparseOverscaled?: boolean
    
    `true` if tiles should be sent back to the worker for each overzoomed zoom level, `false` if not. Fill this option when computing covering tiles for a source. When true, any tile at `maxzoom` level that should be overscaled to a greater zoom will have its zoom set to the overscaled greater zoom. When false, such tiles will have zoom set to `maxzoom`.
    
-   ##### `Optional`terrain?: [Terrain](https://docs.maptiler.com/sdk-js/api-reference/classes/Externals.Terrain/)
    
    When terrain is present, tile visibility will be computed in regards to the min and max elevations for each tile.