MalaGIS

Sharing GIS Technologies, Resources and News.

Author: An anonymous GIS professional specializing in astronomy, geography, remote sensing, and geomancy.

Tianditu (National Platform for Common Geospatial Information Services), hosted by the Ministry of Natural Resources, provides public online geospatial services and promotes geospatial data sharing. For GIS professionals, a common requirement is loading various online basemaps. Tianditu offers convenient services for desktop software like ArcMap and QGIS. While QGIS has mature plugins, this guide focuses on ArcMap users.

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Following our guide on https://malagis.com/qucik-build-a-cesium-study-example.html, this article addresses limitations of Cesium Ion—particularly accessibility challenges for Chinese users—by demonstrating alternative basemap integration methods.

Understanding ImageryLayers

The ImageryLayers class manages map imagery display in CesiumJS, enabling:

• Multi-layer overlays (satellite imagery, custom maps)
• Layer ordering control
• Transparency/visibility adjustments

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In follow-up to our tutorial on Creating Dynamic Marathon Route Visualizations with MapPlus: A No-Code GIS Solution, we compiled a comprehensive dataset of Chinese marathons through automated data processing. This article documents the methodology and technical implementation.

Marathon distribution heatmap in QGIS

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While reviewing flood reports, an unusual phenomenon caught my attention: Vietnamese ducks carried by floodwaters into Guangxi, China. This initially seemed geographically counterintuitive—Vietnam lies south of China, so why would floodwaters flow northward? Further investigation revealed fascinating hydrological realities.

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