)
        const tileData = TileData['mapzen'] // redfishUSA/World, mapzen, mapbox
        const terrainName = 'topo'

        // ================ create map with terrain & elevation ================

        const center = [35.67, -105.93]
        const Z = 10 // 10 11
        const map = L.map('map', {
            zoomDelta: 0.25, //0.1
            zoomSnap: 0,
            preferCanvas: true,
            // renderer: L.canvas()
        }).setView(center, Z)

        const terrainLayer = L.tileLayer(gis.tem