MalaGIS

Sharing GIS Technologies, Resources and News.

This afternoon, while I was browsing the Mala GIS group, a user named @zheer discovered a pop-up demanding unpaid wages in an open-source Cesium examples project. This immediately piqued my interest, so I opened it to explore. The project summarizes common effects in Cesium development with over 200 demos, and also includes over 100 demos developed with ThreeJS. It's lamentable that such a talented developer had to resort to using an open-source project to plead for their wages, which is quite disheartening.

Open-source project address: https://jiawanlong.github.io/

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Last year, our team introduced how to load lunar datasets in Cesium. Now, one year later, Cesium has officially begun supporting the Mars dataset—Cesium Mars. Cesium Mars is a 3D Tileset designed to enable developers and researchers to quickly create visualizations and simulations of Mars. The dataset integrates laser altimeter data (MOLA) from NASA's Mars Global Surveyor (MGS), high-resolution stereo camera imagery (HRSC) from ESA's Mars Express, and color satellite image rendering, realistically recreating the visual appearance of Mars.

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In a previous article "Maptalks: An Open-Source Alternative to Cesium for Geospatial Visualization", we introduced maptalks as an alternative framework to Cesium. Recently, we discovered another open-source 2D/3D engine: three-tile. Designed for lightweight implementation with ongoing functional improvements, it already meets significant development demands. Here is a brief introduction.

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The recent sale of 43 global ports by Li Ka-shing—including two along the Panama Canal—has drawn international attention. I attempted to develop an interactive Cesium visualization showing these ports' geographic distribution, but news reports only mentioned quantities without specific coordinates. This required manual data collection.

PS: Video demonstration available on MalaGIS Video Channel.

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When creating thematic maps in ArcGIS or QGIS, thematic coloring (choropleth mapping) is a common technique where different regions are colored according to their data values, revealing spatial patterns. Recently, our management requested integrating this functionality into our business system. While we could publish pre-rendered maps from ArcGIS/QGIS through servers like GeoServer, this lightweight feature doesn't warrant heavy infrastructure. Instead, I explored coloring GeoJSON features directly and discovered colormap - an elegant solution.

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Since U.S. President Donald Trump's executive order on his first day in office renamed the Gulf of Mexico to the "Gulf of America," the ripple effects have begun to spread. Recent reports indicate that major map service providers like Google Maps have already followed suit. But how does this change affect GIS professionals in China, and how should we respond? This article provides a brief analysis.

Updates from International Map Services

After reviewing services like Google Maps, Bing Maps, OpenStreetMap, and Cesium, here’s a summary of how each platform is handling the name change.

Google Maps

Google Maps was one of the first to react. Here's how it looks now:

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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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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

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When integrating Cesium into a legacy UMI3-based WebGIS project, Node version compatibility issues arose due to Cesium's requirement for Node ≥18.18.0. Direct Node upgrade would trigger extensive regression testing, making alternative deployment approaches necessary.

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When deploying CesiumJS projects, the library's substantial size (~100MB) often slows CI builds. This analysis evaluates domestic CDN options for external Cesium loading to optimize deployment efficiency without compromising functionality.

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