Timeframe
A timeframe is a snapshot of a specific moment in a Grid Overlay's calculation.
The following Overlays support timefames for their results:
- Water Overlay
- Heat Stress Overlay
- Shadow Overlay
- Subsidence Overlay
- Traffic Density Overlay
- GeoTIFF Overlay (referencing multiple GeoTIFFs)
- WMS Overlay (using multiple layers)
The following Grid Overlays can have multiple timeframes when configured with a Prequel:
- Average Overlay
- Combo Overlay
- Distance Overlay
- Sight Distance Overlay
- Safety Distance Overlay
- Travel Distance Overlay
Progression over time
In most cases, the Grid Overlay performs a simulation of a certain phenomenon from an initial moment in time up to a certain final moment. The timeframes show intermediate results partway through the progression of the simulation, with the last timeframe showing the final result at the end of the simulation. In these cases, each simulation step depends on the preceding one.
For example: If a Water Overlay is configured to simulate 24 hours, and output 4 timeframes with default intervals, the results will show the amount of water at 6, 12, 18, and 24 hours since the start of the simulation respectively.
Separate results
Some Grid Overlays perform multiple calculations in parallel which are then all considered parts of the final dataset. Here, each timeframe uses a nearly independent set of parameters to determine its output.
For example: The Heat Stress Overlay can be configured to calculate the heat situations for 3 separate dates or times, each with their own temperature, wind, etc.