traffic_density
Retrieve vessel traffic density as grid cells showing distinct vessels and total position counts for a region or bounding box over a chosen time window.
Instructions
Where vessels have actually been, as a grid of counts.
Read this as coverage as much as traffic. It shows where positions were received, so an empty cell means either that no ship went there or that nothing was listening. Port Klang reads as empty on this map and it is one of the busiest ports in the world.
Each cell reports distinct vessels and total positions separately, because they answer different questions: one ship anchored for two days makes hundreds of positions in a single cell, which is a fact about that ship and not about how busy the cell is.
Input Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| bbox | No | Area to report instead, as 'south,west,north,east'. | |
| days | No | How far back to include, in days, up to the 90 day retention window. | |
| region | No | Region key to report, for example 'malacca-strait'. Call list_regions for the keys. Ignored when bbox is given. | |
| cell_degrees | No | Grid cell size in degrees. 0.02 is about 1.2 nautical miles. Smaller resolves more and costs more. |
Output Schema
TableJSON Schema
| Name | Required | Description | Default |
|---|---|---|---|
| result | Yes |