What Are Layers?

What Are Layers

In the context of our Cesium UI, “layers” are individual data sources that are displayed on top of the virtual globe. Think of them like transparent sheets of information that can be stacked on one another to build a comprehensive view of a scene. Each layer can represent different types of data, from imagery and terrain to 3D models and geographic features.

Understanding how to use and combine different layers is key to effectively visualizing your data and generating unique and detailed scenes.

Layers can be manipulated using the Layers panel in the Scene Manager

We primarily categorize layers into two main types:

Base Layers

A base layer forms the foundation of your scene. It provides the initial visual context for the globe, typically consisting of satellite imagery and terrain data. You can only have one active base layer at a time. Changing the base layer will completely alter the fundamental appearance of the globe.

Examples of Base Layers You Might Use:

High-Resolution Satellite Imagery: For detailed visual inspection of land cover, urban areas, or specific geographical features. This is often the default and most commonly used base layer.

Terrain Data (with or without imagery): Provides the elevation model of the Earth, allowing for realistic representation of mountains, valleys, and other topographical features. You might use a terrain-only base layer if you want to apply your own custom imagery as an overlay.

Topographic Maps: Offers a more traditional map view with contour lines, roads, and place names, useful for navigation and general geographical understanding.

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Dark Basemap: A subtle, low-light basemap that allows your data to stand out more prominently, particularly useful when visualizing complex or brightly colored overlay layers.

Overlay Layers

Overlay layers are additional data sources that are displayed on top of the chosen base layer. You can have multiple overlay layers active simultaneously, allowing you to combine different types of information to create rich and informative visualizations.

Examples of Overlay Layers You Might Use in Cesium Scenes:

3D Buildings and Models: To visualize architectural structures, cityscapes, or specific assets in their real-world context.

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Geospatial Data (e.g., Points, Lines, Polygons): To highlight specific locations, pathways, or administrative boundaries.

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Weather Data Overlays: To visualize real-time or historical weather patterns, such as cloud cover, precipitation, or temperature maps.

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Sensor Data Visualizations: To display data collected from sensors, such as temperature readings, air quality measurements, or electromagnetic field strengths.

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Heatmaps: To represent the density or intensity of a particular phenomenon across a geographical area.

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Historical Imagery: To compare current conditions with past satellite views for change detection or historical analysis.

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Custom KML/GeoJSON Data: To import and display your own geographical data in various formats.

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By strategically combining different base and overlay layers, you can customize your Cesium view to highlight specific information and gain a deeper understanding of the geospatial data relevant to your needs.