SmartNode is a satellite relay simulation platform for space-based data backhaul, combining a Flask REST API backend with a Vue 3 frontend that visualizes satellite constellations on a Cesium 3D globe. It simulates LEO/MEO/GEO satellites, ground stations, and relay links, processing data transmission requests with configurable QoS, security, and value profiles. The backend implements orbital propagation (SGP4/TLE, Keplerian elements), ITU-R link budget models (rain attenuation, gaseous absorption, laser ISL), and scheduling strategies (GreedyMaxRate, QoS-aware admission control, handover with hysteresis). Results are persisted in SQLite and an append-only event log, with real-time updates pushed via SSE. The platform includes a full observability stack (Prometheus, Grafana, OpenTelemetry), containerized deployment, and extensive testing (unit, integration, property-based, golden regression, load). While primarily an application, it incorporates significant data/research components in orbital mechanics, communications, and scheduling algorithms, making it a hybrid but application-dominant project.
vue-cesium is a comprehensive Vue 3 component library that wraps CesiumJS, enabling developers to build 3D geospatial web applications using declarative Vue components. It provides a rich set of components for the Cesium viewer, imagery layers, terrain providers, entities, primitives, geometries, graphics, controls (compass, zoom, navigation, status bar, print), overlays (HTML, heatmap, ECharts, wind, dynamic, typhoon), drawing/measurement tools, analysis features (viewshed, flood), post-process effects, and a full UI kit (buttons, icons, tooltips, sliders, spinners, fab). The library follows a composable-based architecture where each Cesium object type has a corresponding composable managing its lifecycle, prop reactivity, and event bridging. It supports multiple map providers (Baidu, Tianditu, ArcGIS, etc.) with custom coordinate transformations for Chinese coordinate systems. The project is a monorepo with packages for components, composables, shared utilities, locale, theme, and directives. It includes a comprehensive documentation site built with Vitepress featuring live demos and bilingual support (en-US, zh-CN). The codebase demonstrates solid engineering practices with reusable composables, custom material extensions, and a consistent component pattern, though it has some technical debt such as bundled Cesium workers, global Cesium references, and deep watchers that may impact performance with large datasets.
This repository defines the quantized-mesh-1.0 terrain format, a specification for encoding and streaming terrain tiles in a multi-resolution quadtree pyramid. It includes detailed documentation of the binary tile structure (header, vertex data, index data, edge indices, and extensions) and the JSON manifest format (layer.json) with accompanying JSON schemas for validation. The format is used by CesiumJS for 3D terrain rendering and enables efficient sharing of terrain data. While the repository does not contain processing code, it provides a complete and reusable specification for producers and consumers of quantized-mesh tiles, including the schemas for layer manifests and availability rectangles.
This repository is a comprehensive gallery of self-contained demo examples for the VJMap (唯杰地图) SDK, a client-side WebGIS library specialized in rendering CAD drawings (DWG) and custom map formats using WebGL vector tiles. Each example is a standalone HTML page with embedded JavaScript that demonstrates a specific feature: map opening (vector/raster/memory), markers, overlays (circles, polygons, symbols, fill extrusion), animations, drawing tools, 3D integration with Three.js/deck.gl/L7, and interoperation with third-party mapping libraries (Leaflet, OpenLayers, MapTalks, Cesium). All demos connect to a hosted VJMap backend service via a hardcoded access token. The code is heavily duplicated across Chinese and English directories (src/src_en) and follows a repetitive boilerplate pattern. While the repository excels as an educational resource for the SDK, it is not a production application; its structure lacks modularity, contains hardcoded credentials, and relies on deprecated libraries in some examples. The primary value is as a reference for VJMap API usage, not as a reusable codebase.