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GeoSet Map Layer

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geoset-bot[bot] edited this page Apr 1, 2026 · 10 revisions

GeoSet Map Layer

The GeoSet Map Layer (deck_geoset_map_layer) is the core chart type for rendering geospatial data. It renders a single layer of geographic features on an interactive map and is the building block for GeoSet Multi Map.

Screenshot 2026-02-23 at 4 07 24 PM

Creating a Chart

  1. In Superset, go to Charts → + Chart
  2. Select your dataset and choose GeoSet Map Layer as the chart type
  3. In the Map Configuration panel, configure your layer
geoset-chart-selection geoset-layer-chart-builder

Map Configuration Controls

GeoJSON Column

Select the column in your dataset that contains GeoJSON geometry. This can be a geometry column (PostGIS) or a text column containing GeoJSON strings.

Layer Type

Type Description
Polygon Filled polygons with configurable stroke. Best for boundary/area data.
Point Individual points or icons at coordinate locations. Supports clustering.
Line Polylines and paths. Supports dashed/dotted styles.
Text Overlay Text labels rendered at feature locations. Requires a Text Label Column.
GeoJSON Raw GeoJSON — auto-detects geometry type from the data.

Row Limit

Maximum number of features to load. For large datasets, increase this or use server-side filtering with Filters.

Autozoom

When enabled, the map automatically fits its viewport to the extent of the loaded features on each query. When disabled, you control the viewport manually.

Viewport

Sets the initial map center, zoom, pitch, and bearing. Only visible when Autozoom is off.

  • Capture Map Viewport — click to snap the popover values to the current map position
  • Enable Static Viewport — locks the map to the saved viewport; panning and zooming will not change the saved position
  • Save — persists the viewport values
  • Close — reverts to the last saved viewport

Mapbox Style

Choose the base map style (streets, satellite, dark, light, etc.). Requires a valid Mapbox API key in your environment.

Min/Max Zoom Slider

Sets the zoom range at which this layer is visible. Useful for multi-layer maps where you want different levels of detail at different zoom levels.

Point Clustering

Only available for the Point layer type.

Control Description
Enable Clustering Groups nearby points into cluster circles
Cluster Radius Pixel radius for grouping points into a cluster
Cluster Max Zoom Zoom level at which clustering stops and individual points appear
Min Points per Cluster Minimum number of points required to form a cluster

Hover Data Columns

Columns to display in the tooltip when hovering over a feature.

Feature Info Columns

Columns to display in the click popup when a feature is clicked.

GeoJSON Config

The GeoJSON Config editor controls how features are styled and labeled. It accepts a JSON object with the following top-level keys.

globalColoring

Applies a single style to all features. Used when you don't need per-category or per-value coloring.

{
  "globalColoring": {
    "fillColor": [40, 147, 179, 255],
    "strokeColor": [0, 0, 0, 255],
    "strokeWidth": 2,
    "lineStyle": "solid",
    "fillPattern": "solid",
    "pointType": "circle"
  }
}
Field Type Description
fillColor [R, G, B, A] Fill color as RGBA (0–255)
strokeColor [R, G, B, A] Stroke/outline color as RGBA
strokeWidth number Stroke width in pixels
lineStyle string Line rendering style: "solid", "dashed", or "dotted". Optional, defaults to null.
fillPattern string "solid" (required)
pointType string Icon name for point layers: "circle", "point", "marker", "square", or "triangle". Optional, defaults to null (circle).

pointSize

Controls the size of point icons. This is a top-level key (not inside globalColoring). It accepts either a static number or a dynamic data-driven configuration object.

Static — a single pixel size applied to all points (1–200):

{
  "pointSize": 10
}

Dynamic — sizes points based on a numeric column value:

{
  "pointSize": {
    "valueColumn": "incident_size",
    "startSize": 4,
    "endSize": 30,
    "lowerBound": null,
    "upperBound": null
  }
}
Field Type Description
valueColumn string The numeric column to map to point size
startSize number Pixel size at the lower bound (1–200)
endSize number Pixel size at the upper bound (1–200, must be greater than startSize)
lowerBound number, string, or null Value that maps to startSize. A number sets an absolute value, a string like "25%" uses the 25th percentile of the data, and null uses the data minimum.
upperBound number, string, or null Value that maps to endSize. A number sets an absolute value, a string like "75%" uses the 75th percentile of the data, and null uses the data maximum.

colorByCategory

Colors features by a categorical column. Each category maps to a color and an optional legend label.

{
  "colorByCategory": {
    "dimension": "fire_cause",
    "categoricalColors": [
      {
        "Human": {
          "fillColor": [255, 100, 0, 255],
          "legend_entry_name": "Human Caused"
        }
      },
      {
        "Natural": {
          "fillColor": [0, 180, 80, 255],
          "legend_entry_name": "Natural"
        }
      }
    ],
    "defaultLegendName": ["Other"]
  }
}
Field Description
dimension The dataset column name to color by
categoricalColors Array of { category_value: { fillColor, legend_entry_name } } objects
defaultLegendName Label shown in the legend for values not in categoricalColors

colorByValue

Colors features using a gradient based on a numeric column value. Bounds and breakpoints accept both numeric values and percentile strings (e.g. "10%", "90%"), which are resolved against the actual data distribution on the frontend.

{
  "colorByValue": {
    "valueColumn": "max_wind_speed",
    "upperBound": 150,
    "lowerBound": 0,
    "startColor": [255, 255, 0, 255],
    "endColor": [255, 0, 0, 255],
    "breakpoints": []
  }
}
Field Description
valueColumn The numeric column to map to color
upperBound Value that maps to endColor. Number, percentage string (e.g. "90%"), or null for data maximum.
lowerBound Value that maps to startColor. Number, percentage string (e.g. "10%"), or null for data minimum.
startColor RGBA color for the lowest value
endColor RGBA color for the highest value
breakpoints Optional array of intermediate stops (numbers or percentage strings)

legend

Controls how this chart's layer appears in a multi-layer legend.

{
  "legend": {
    "title": "Storm Data",
    "name": "Storm Track Points"
  }
}
Field Description
title Group heading in the multi-layer legend
name Label for this specific layer within the group

textOverlayStyle

Controls the appearance of text annotations rendered on the map. Only applies when a Text Label Column is selected in the chart controls. Color is inherited from globalColoring.fillColor.

{
  "textOverlayStyle": {
    "fontFamily": "Arial, sans-serif",
    "fontSize": 14,
    "bold": false,
    "offset": [0, 0]
  }
}
Field Type Default Description
fontFamily string "Arial, sans-serif" CSS font family for text labels
fontSize integer 14 Font size in pixels (1–128)
bold boolean false Whether to render text in bold
offset [x, y] [0, 0] Pixel offset from the feature's anchor point

Lasso Select Tool

The lasso tool lets you draw a shape on the map to select features and export them. It works on both single-layer and GeoSet Multi Map maps.

Usage

  1. Click the lasso icon in the top-right map controls
  2. Choose a layer from the dropdown (single-layer maps auto-select the active layer)
  3. Pick a draw mode — Click-and-drag (freehand), Polygon, Circle, or Rectangle
  4. Draw your selection shape on the map
  5. A results bar appears showing the count of selected features
  6. Use the kebab menu on the results bar to export as CSV or Excel
  7. Press Escape or click the X on the results bar to clear the selection

Selection Behavior

Geometry Type How Selection Works
Point Selected if the point falls inside the lasso shape
Polygon/MultiPolygon Selected if at least 50% of the polygon's area overlaps the lasso shape
Line/MultiLine Selected if any segment of the line geometrically intersects the lasso shape

Selected features are highlighted with their original colors while unselected features are dimmed. The map can be panned and zoomed after drawing to inspect the selection.

Export Columns

Exported CSV and Excel files include the Hover Data and Feature Info columns configured on the layer, plus geometry metadata (type, longitude, latitude). Internal styling properties are excluded.

Per-Layer Configuration

In GeoSet Multi Map, each layer has a Lasso Selectable toggle in its settings popover. Disable it for layers that shouldn't appear in the lasso dropdown (e.g., boundary or reference layers).

Schema Versioning

The GeoJSON Config is validated on the backend through versioned Marshmallow schemas (V1, V2, V3, etc.). When you save a chart, the frontend includes a schema_version number. If a chart was saved with an older schema version, the backend can automatically upgrade it to the latest version via the /geoset_map/schema/<from>/<to> conversion endpoint. This means older chart configurations continue to work as new fields are added in later schema versions.

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