This section documents API usage specific to this template, so for an introduction we suggest you refer to the generic API documentation instead.

Template data

There are three different formats in which you can supply data to this template. The most convenient for you to use likely depends on the source of your data, as described below.

1. Array of arrays, and a bindings object

You can supply arrays of arrays to opts.data, which might look like:

{
    data: {
        choropleth: [
            [ "ChoroplethColumn1Value1", "ChoroplethColumn2Value1",
            [ "ChoroplethColumn1Value2", "ChoroplethColumn2Value2",
            [ "ChoroplethColumn1Value3", "ChoroplethColumn2Value3",
            ...
        ],
        points: [
            [ "PointsColumn1Value1", "PointsColumn2Value1",
            [ "PointsColumn1Value2", "PointsColumn2Value2",
            [ "PointsColumn1Value3", "PointsColumn2Value3",
            ...
        ]
    }
}

where each array of arrays represents the rows in a data sheet.

To tell the API how the values from each column should be associated with the keys that the template is expecting, you must also supply an object attached to opts.bindings. (The meanings of the keys in the bindings object are documented below.) The minimal bindings you can supply for this template are as shown in this example:

{
    template: "@flourish/projection-map",
    version: "2",
    bindings: {
        choropleth: {
            
        },
        points: {
            
        }
    },
    data: {
        choropleth: [
            [ "ChoroplethColumn1Value1", "ChoroplethColumn2Value1",
            [ "ChoroplethColumn1Value2", "ChoroplethColumn2Value2",
            [ "ChoroplethColumn1Value3", "ChoroplethColumn2Value3",
            ...
        ],
        points: [
            [ "PointsColumn1Value1", "PointsColumn2Value1",
            [ "PointsColumn1Value2", "PointsColumn2Value2",
            [ "PointsColumn1Value3", "PointsColumn2Value3",
            ...
        ]
    }
}

All possible bindings that you can supply are shown in this example:

{
    template: "@flourish/projection-map",
    version: "2",
    bindings: {
        choropleth: {
            geometry: 0, // index of a column in your data
            name: 1, // index of a column in your data
            value: [2, 3, ...], // index(es) of column(s) in your data
            metadata: [4, 5, ...], // index(es) of column(s) in your data
        },
        points: {
            name: 0, // index of a column in your data
            lon: 1, // index of a column in your data
            lat: 2, // index of a column in your data
            color: 3, // index of a column in your data
            value: 4, // index of a column in your data
            metadata: [5, 6, ...], // index(es) of column(s) in your data
        }
    },
    data: {
        choropleth: [
            [ "ChoroplethColumn1Value1", "ChoroplethColumn2Value1",
            [ "ChoroplethColumn1Value2", "ChoroplethColumn2Value2",
            [ "ChoroplethColumn1Value3", "ChoroplethColumn2Value3",
            ...
        ],
        points: [
            [ "PointsColumn1Value1", "PointsColumn2Value1",
            [ "PointsColumn1Value2", "PointsColumn2Value2",
            [ "PointsColumn1Value3", "PointsColumn2Value3",
            ...
        ]
    }
}

2. Array of objects with arbitrary keys, and a bindings object

This format is most likely useful when you have data from an external source, such as CSV data loaded from d3-dsv. You should supply this attached to the opts.data, which might look like:

{
        choropleth: [
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            ...
        ],
        points: [
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            ...
        ]
    }

... but with the keys being the column headers from your source data instead. You must also supply an object attached to opts.bindings. The minimal bindings you can supply for this template are as shown in this example:

{
    template: "@flourish/projection-map",
    version: "2",
    bindings: {
        choropleth: {
            
        },
        points: {
            
        }
    },
    data: {
        choropleth: [
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            ...
        ],
        points: [
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            ...
        ]
    }
}

All possible bindings that you can supply are shown in this example:

{
    template: "@flourish/projection-map",
    version: "2",
    bindings: {
        choropleth: {
            geometry: "ChoroplethHeader1",
            name: "ChoroplethHeader2",
            value: ["ChoroplethHeader3", "ChoroplethHeader4", ...],
            metadata: ["ChoroplethHeader5", "ChoroplethHeader6", ...],
        },
        points: {
            name: "PointsHeader1",
            lon: "PointsHeader2",
            lat: "PointsHeader3",
            color: "PointsHeader4",
            value: "PointsHeader5",
            metadata: ["PointsHeader6", "PointsHeader7", ...],
        }
    },
    data: {
        choropleth: [
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            { "ChoroplethHeader1": ..., "ChoroplethHeader2": ..., ... },
            ...
        ],
        points: [
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            { "PointsHeader1": ..., "PointsHeader2": ..., ... },
            ...
        ]
    }
}

(As before, the keys containing "Header" would be replaced by column names from your data source.)

3. Array of objects with template-defined keys

There is an alternative format you can use, which is likely to be easier to use if your data is not from a spreadsheet source. With this alternative format you supply your data to the template as an array of objects, attached to opts.data, where the keys must be those used by the template, as documented below. In this case there is no need to supply a bindings object, since the key names are already those expected by the template. The required properties in the data object are as follows (scroll down for a description of what each property is):

{
    template: "@flourish/projection-map",
    version: "2",
    data: {
    choropleth: [
        {
            value: [...],
            metadata: [...]
        },
        ...
    ],
    points: [
        {
            metadata: [...]
        },
        ...
    ]
},
    ...
}

And the full list of all possible properties is as follows:

{
    template: "@flourish/projection-map",
    version: "2",
    data: {
    choropleth: [
        {
            geometry: ...,
            name: ...,
            value: [...],
            metadata: [...]
        },
        ...
    ],
    points: [
        {
            name: ...,
            lon: ...,
            lat: ...,
            color: ...,
            value: ...,
            metadata: [...]
        },
        ...
    ]
},
    ...
}

Meanings of the template data keys:

• choropleth.geometry: geometry
• choropleth.name: name
• choropleth.value: value
• choropleth.metadata: metadata
• points.name: name
• points.lon: lon
• points.lat: lat
• points.color: color
• points.value: value
• points.metadata: metadata

Template settings

Options for opts.state.

Projection

projection string

Projection.

fit string

Bounds.

centering string

min_area number

Minimum area. In km². Polygons representing areas below this size won't be considered when fitting the map. Setting is ignored if no polygons are bigger than the specified minimum area.

longitude number

Centre long..

latitude number

Centre lat..

roll number

Rotation.

padding number

Padding (%). Padding added to map (as percentage of smaller of width and height)

zoom number

Zoom. 1 to show whole world, > 1 to zoom in.

aspect number

Aspect ratio. Width divided by height. If left blank will use aspect ratio of projection for whole world.

Points layer

point_show boolean

point_min_radius number

Minimum radius. Any smaller circles will be scaled up to the specified level. (Ignored if greater than the “Maximum radius” setting.)

point_max_radius number

Maximum radius.

point_max_value number

Maximum value. Values bigger than this maximum will have a radius equal to the maximum radius. Leave blank to use the maximum in the dataset

point_default_radius number

Radius.

point_opacity number

Opacity.

point_fill color

Default fill.

point_categorical_colors.palette colors

Palette.

point_categorical_colors.extend boolean

Auto-extend. Automatically generate additional colours when needed to avoid the palette colours being used more than once. Added colours are based on the average lightness and chroma values of the palette. This works best if the palette’s colours do not have very high or low saturation.

point_categorical_colors.advanced boolean

Fine tune. Fine tune how additional colours are added to the palette.

point_categorical_colors.hue_rotation_angle number

Hue rotation for added colours. Angle, in degrees in HCL colourspace, between one generated colour and the next. The default value, ~360/(Golden ratio), ensures adjacent hues are not too similar.

point_categorical_colors.custom_palette text

Custom overrides. Type the name of the entity whose colour you want to set, a colon and then a colour (using a name, hex-code or rgb declaration). Multiple colours can be set using multiple lines. For example:

---

Party 1: red
Party 2: #4455AA
Party 3: rgb(30,168,26)

point_sort boolean

Place smaller points above. If checked the smallest points are drawn last so they're always visible and hoverable. If not checked then points at the top of the data sheet are drawn first

legend_show boolean

Colour legend.

legend_interaction boolean

Click legend swatch to hides/show points.

scale_legend_show boolean

Size legend.

scale_legend_color color

Color.

point_formatting.prefix string

Prefix. Text to place in front of number

point_formatting.suffix string

Suffix. Text to place after number

point_formatting.n_dec number

Decimal places. Use negative integers to round to positive powers of ten (eg -2 rounds to the nearest 100)

point_formatting.strip_zeros boolean

Remove trailing zeros.

point_formatting.strip_separator boolean

Hide thousands separator below 10,000. Turn off if you want four-digit numbers to include a separator, e.g. “1,234” rather than “1234”.

point_formatting.transform_labels boolean

Multiply/divide values.

point_formatting.transform string

point_formatting.multiply_divide_constant number

point_formatting.exponentiate_constant number

point_show_popup boolean

Show popup on hover.

point_hide_popup_pointer boolean

Hide pointer.

point_search boolean

Enable search.

Regions layer

map_show boolean

map_fill color

Fill. Ignored for regions with values.

map_fill_opacity number

Fill opacity.

map_show_stroke boolean

map_stroke color

Colour.

map_stroke_width number

Width.

map_stroke_opacity number

Opacity.

map_highlight_stroke_inner color

Inner stroke.

map_highlight_stroke_outer color

Outer stroke.

map_highlight_stroke_width number

Stroke width.

map_scale_type string

Type.

map_numeric_type string

sequential_palette string

Palette.

diverging_palette string

Palette.

reverse_scale_colors boolean

Reverse colours.

underflow_value number

Gradient start. Defaults to a value close to the minimum of the data.

midpoint_value number

Gradient midpoint. Defaults to the value halfway between the start and end points.

overflow_value number

Gradient end. Defaults to value close to the maximum of the data.

discrete_mode string

Mode.

n_bins number

Number of bins.

custom_thresholds string

Thresholds. List numeric thresholds, separated by semi-colons.

map_categorical_colors.palette colors

Palette.

map_categorical_colors.extend boolean

Auto-extend. Automatically generate additional colours when needed to avoid the palette colours being used more than once. Added colours are based on the average lightness and chroma values of the palette. This works best if the palette’s colours do not have very high or low saturation.

map_categorical_colors.advanced boolean

Fine tune. Fine tune how additional colours are added to the palette.

map_categorical_colors.hue_rotation_angle number

Hue rotation for added colours. Angle, in degrees in HCL colourspace, between one generated colour and the next. The default value, ~360/(Golden ratio), ensures adjacent hues are not too similar.

map_categorical_colors.custom_palette text

Custom overrides. Type the name of the entity whose colour you want to set, a colon and then a colour (using a name, hex-code or rgb declaration). Multiple colours can be set using multiple lines. For example:

---

Party 1: red
Party 2: #4455AA
Party 3: rgb(30,168,26)

choropleth_missing_values string

Action.

missing_pattern_opacity number

Opacity. This value is multiplied by the Fill opacity value.

missing_pattern_size number

Square size.

missing_pattern_color_1 color

Colour 1.

missing_pattern_color_2 color

Colour 2.

choropleth_legend_show boolean

Categorical legend will always be hidden if there are over 100 categories

legend_min number

Min. Leave blank to autofit based on data and colour scales. Value is ignored if not less than the legend maximum.

legend_max number

Max. Leave blank to autofit based on data and colour scales. Value is ignored if not greater than the legend minimum.

legend_labels string

Label.

n_nice_ticks number

Aproximate number of labels.

legend_labels_custom string

Labels. List numeric values, separated by semi-colons.

legend_enhancement string

Enhancement.

strip_style string

Appearance.

strip_marker_opacity_type string

Marker opacity.

strip_marker_opacity number

Value.

region_controls.type string

Data type.

region_controls.temporal_format string

Date/time format in data. The date/time format in your data sheet. Used only to sort the data, if required. If your format isn’t in the list, you can enter a custom format using d3-time-format syntax. See npmjs.com/package/d3-time-format for details.

region_controls.sort boolean

Sort menu.

region_controls.control string

Control.

region_controls.width number

Menu width.

region_controls.play_button boolean

Include play button.

region_controls.step_time number

Time between steps when playing. Measured in seconds, positive values move the slider left to right, negative values move the slider right to left.

region_controls.loop boolean

Loop on play.

region_controls.restart_pause number

Pause before loop restarts. Measured in seconds and in addition to the regular step time displayed above.

region_controls.dropdown_icon_color color

Icon color.

region_controls.slider_handle_color color

Handle and button color.

region_controls.slider_track_color color

Track and label color.

map_formatting.prefix string

Prefix. Text to place in front of number

map_formatting.suffix string

Suffix. Text to place after number

map_formatting.n_dec number

Decimal places. Use negative integers to round to positive powers of ten (eg -2 rounds to the nearest 100)

map_formatting.strip_zeros boolean

Remove trailing zeros.

map_formatting.strip_separator boolean

Hide thousands separator below 10,000. Turn off if you want four-digit numbers to include a separator, e.g. “1,234” rather than “1234”.

map_formatting.transform_labels boolean

Multiply/divide values.

map_formatting.transform string

map_formatting.multiply_divide_constant number

map_formatting.exponentiate_constant number

map_show_popup boolean

Show popup on hover.

map_hide_popup_pointer boolean

Hide pointer.

map_search boolean

Enable search.

map_shadow boolean

Add shadow.

map_shadow_offset_x number

Horizontal offset.

map_shadow_offset_y number

Vertical offset.

map_shadow_blur number

Blur.

map_shadow_color color

Colour.

map_shadow_opacity number

Opacity.

Graticule layer

graticule_show boolean

graticule_color color

Colour.

graticule_width number

Width.

graticule_opacity number

Opacity.

graticule_separation_longitude number

Longitude separation (°).

graticule_separation_latitude number

Latitude separation (°).

Globe layer

globe_show boolean

globe_color color

Globe colour.

Zoom

zoom_on boolean

zoom_animation_duration number

Animation duration (in seconds). Used when changing slides in stories

zoom_scaling_mode string

Scaling of points and outlines.

zoom_message_key string

Zoom message (key). {{KEY}} is a special name that will be replaced by 'Ctrl' on Windows and '⌘' on Apple computers

zoom_message_touch string

Zoom message (touch).

Number styles

localization.input_decimal_separator string

Decimal separator in data sheet. Used for interpreting your data. Only change if data is not displaying on the chart as expected.

localization.output_separators string

Number format to display. How the numbers should appear on chart labels

Layout

layout.body_font font

Font.

layout.max_width number

Maximum width. Leave blank to stretch to container width

layout.margin number

Margin.

layout.background_color_enabled boolean

Color.

layout.background_image_enabled boolean

Image.

layout.background_color color

Color.

layout.background_image_src url

Image URL.

layout.background_image_size string

Size.

layout.background_image_position string

Position.

layout.layout_order string

Layout order.

layout.space_between_sections string

Space between sections.

layout.space_between_sections_custom number

Custom.

Header

layout.header_align string

Alignment.

layout.title string

layout.title_styling boolean

Change title styles.

layout.title_size string

Size.

layout.title_size_custom number

Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3

layout.title_weight string

Weight.

layout.title_color color

Color.

layout.title_line_height number

Line height.

layout.subtitle string

layout.subtitle_styling boolean

Change subtitle styles.

layout.subtitle_size string

Size.

layout.subtitle_size_custom number

Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3

layout.subtitle_weight string

Weight.

layout.subtitle_color color

Color.

layout.subtitle_line_height number

Line height.

layout.subtitle_space_above string

Space above.

layout.subtitle_space_above_custom number

Custom.

layout.text string

layout.text_styling boolean

Change text styles.

layout.text_size string

Size.

layout.text_size_custom number

Custom. Specify a custom responsive font size. Best results will be with values between 1.2 and 3

layout.text_weight string

Weight.

layout.text_color color

Color.

layout.text_line_height number

Line height.

layout.text_space_above string

Space above.

layout.text_space_above_custom number

Custom.

Footer

layout.source_name string

Source name.

layout.source_url string

Source url.

layout.multiple_sources boolean

Multiple sources.

layout.source_name_2 string

Source name.

layout.source_url_2 string

Source url.

layout.source_name_3 string

Source name.

layout.source_url_3 string

Source url.

layout.source_label string

Source label.

layout.note string

Note.

layout.size number

Size.

layout.color color

Color.

layout.footer_align string

Alignment.

layout.logo_url url

Image.

layout.logo_link_url string

Link.

layout.logo_height number

Height.

layout.logo_margin number

Margin.

layout.logo_order string

Position.

layout.footer_align_vertical string

V. align.

State documentation

hovered_feature hidden

Selected feature. Region or point which is highlighted and which the popup should point to. If nothing is highlighted then this should be null. Otherwise it should be a string of the form -, where is either "regions" or "points" and index is the corresponding (0-based) row index. For example "regions-0" or "points-134". When this value is not null, the sticky_hover property should usually be true.

sticky_hover hidden

Is the popup and highlighting fixed to the hovered_feature (true) or should moving the mouse over other features change which feature is highlighted?.

filter hidden

Points filter. An object whose keys are names of the colour categories (for points) that should be filtered out and whose values are (usually) something truthy.

zoom_transform hidden

Zoom transformation. An object specifying the transformation to zoom the map in on a region. It has five properties. k is the zoom level (k = 1 for no zoom, k > 1 for zoomed in). x and y are the negatives of the horizontal and vertical coordinates (0, 0 is the top left corner) the zoom is centred on. width and height specify the width and height (in pixels) of the map on which the transform is performed.