For global-scale visualizations (e.g., GDP distribution maps), complex tile services like WMTS/WMS are often unnecessary. ECharts-GL provides six high-quality static basemaps—including Earth and lunar datasets—that offer lightweight alternatives to conventional tile services. These pre-rendered images work seamlessly with Cesium, Leaflet, and other mapping frameworks.
Complementary resource: https://malagis.com/share-world-map-vector-data-shp-from-gaode-map.html