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Charts overview

Charts are added per-layer from the Charts tab in the Data Sources section of the layer card. They render with Plotly and appear next to the layer in the APEx Geospatial Explorer when a user opens the info panel or selects a feature.

Add Chart Source dialog with the four data source types

Source types

A chart pulls data from one of four sources:

Type Use for Notes
Direct Connection A CSV at a known URL Simplest case; the URL is fetched at runtime.
From Service A configured backend service that returns CSV/JSON Pick a service registered in the Services tab.
Pixel Values Spectral signature from a multi-band COG Requires at least one COG data source on the layer. See Pixel values.
Field Values Counts/sums from GeoJSON or FlatGeoBuf properties Used for inline pie charts. See Field values.

Supported chart types

The visual editor currently supports Line, Area, and Bar for chartType: xy, plus Pie charts for the Field Values source. Histogram support exists in the schema but is not yet exposed in the editor UI.

  • Visual editor — building traces and styling them.
  • CSV data — date detection and numeric parsing rules.