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Map: Regions
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Region Map renders data that contains latitude and longitude information, but instead of placing icons, the Region Map plots geometric shapes (which represent regions) using GeoJSON. 

Region Map Configuration Steps

  1. Base Map
  2. Regions
  3. Labels & Markers
  4. Optional Layers
  5. Preview

Step 1: Base Map

Base Map configuration for a Region Map is similar to an Icon Map.

Visualization Name

A symbolic name used to represent this Visualization. This is the name that will show up in choosers when adding a Visualization to a page.

Tile Provider

The Tile Provider controls what the map looks like. Each tile set provides its own look and feel, as well as min and max zoom ranges. These ranges are included on the right hand side of the pull-down.

Refer to the Map Tiles and Overlays section for more information.

Default Zoom Levels

Yes Use the minimum and maximum zoom levels that the tile provider supports.
No Specify zoom levels to support, along with the center latitude and longitude. This option is good for limiting a map to a specific region.

Minimum Zoom

Choose the minimum zoom level that the map is allowed to show. This option is only enabled when you choose No for Default Zoom Levels.

Min 1
Max 22

Maximum Zoom

Choose the maximum zoom level that the map is allowed to show. This option is only enabled when you choose No for Default Zoom Levels.

Min 1
Max 22

Auto Zoom & Center

Yes Let the Visualization auto zoom the map to fit all the map markers into view.
No Provide your own custom center point and zoom level to start the map on.

Zoom Level

This sets the default zoom level for the map. 

  • Only visible when Auto Zoom & Center = No. 
  • The Default Zoom Level should be set to a value within the supported range specified by the Tile Provider. 
Min 1
Max 22

Latitude

This sets the Latitude for the center point of the map.

  • Only visible when Auto Zoom & Center = No.
  • Value is expected in decimal format.

Longitude

This sets the Longitude for the center point of the map.

  • Only visible when Auto Zoom & Center = No.
  • Value is expected in decimal format.

Zoom Control

Determines the placement of the zoom control on the map.  Options are:

  • Bottom Left
  • Bottom Right
  • None
  • Top Left
  • Top Right

Enable Geocoding

Enables options for looking up current location based off an address.

Yes Turn on a search field for entering addresses to find on the map. Also adds a “Show my location” button to center the map on your current location.
No Will not add a search field or “Show my location” button to the map.

Step 2:  Regions

This is where a Region Map starts to differ from an Icon Map. Instead of placing icons, the Region Map plots geometric shapes. It uses GeoJSON to define these regions.  

GeoJSON File Attribute

The Attribute in the data source that contains GeoJSON file names. For example, the data source attribute File has U.S. states GeoJSON file names to be used in conjunction with “GeoJSON File URI”.

See the “Working with GeoJSON Files” section below.

GeoJSON File URI

Enter a relative URI to the GeoJSON files specified in the “GeoJSON File Attribute”. It will start from /custom which is file system location /static-web of the edgeCore deployment. 

Example:

regionjsons/USA

The example above translates to the following web URI:

 /custom/regionjsons/USA

The web URI will point at the following directory on the server:

static-web/regionjsons/USA

Fill

Determines how the fill color of the regions is determined.

Static  Statically defines the fill colors of all regions.
Derived Determines a region’s fill color based on values in the data. The color will change based upon a set of rules. Refer to Rule Sets.

A “Static” Fill

The “Static” fill option applies the same static color to all regions.

Color

Determines a static fill color for all regions.

Alpha

Determines the alpha for all regions. The Alpha value allows underlying map detail to show through the region.

Min 0
Max 1

Border Width

Determines the border size to use for all regions.

Min 0
Max 9

Border Opacity

Determines the alpha value for the border. The alpha value allows underlying map detail to show through the border.

Min 0
Max 1

A “Derived” Fill

The “Derived” fill option determines a region’s color based on values in the data. This options allows fill color to change based upon a set of rules. 

Rule Set

This is the only property required for a derived fill. The individual rules within this rule set are what will determine the fill color of a region.

See the Rule Sets section for more information.

Additional Adornments

Show Label

Determines whether to show a textual label in the center of each region.

Yes Shows a label in the center of each region.
No Text Labels are not displayed for regions.

Show Marker

Determines whether to show an icon in the center of each region.

Yes Shows an icon in the center of each region.
No Icons are not displayed for regions.

For a Region Map that uses “FeatureCollection”, marker/label settings do not apply. FeatureCollection is used for complex regions containing multiple polygons. Because there is an array of polygons defining a region, edgeCore is unable to determine which polygon to use when calculating marker and label placement.

Step 3: Labels & Markers

A Label and Marker tab will appear if either “Show Label” or “Show Marker” is set to Yes on the previous step.

Marker Properties

Marker properties will appear if “Show Marker” is set to Yes on the previous step. 

See Icon Renderer for more information.

Label Properties  

Label properties will appear if “Show Label” is set to Yes on the previous step. Otherwise, the position of the label will be centered in the region.

Derive from Attribute

Choose an attribute from the data that contains values to be used as a label.

Formatter

Configure a formatter for the label.

Position

This section determines how the “Marker” and “Label” are positioned, relative to one another. This option is only available if “Show Marker” is also set to Yes on the previous step. Otherwise, the position of the label will be centered in the region.

Determines where the label is positioned within a region.

Bottom Place the label centered and below the marker.
Left Place the label to the left of the marker.
Right Place the label to the right of the marker.
Top Place the label centered and above the marker.

Step 4: Legend

This is will appear on the “Base Map” step of the wizard if:

  • “Fill” is set to Derived From.
  • “Show Marker” is set to Yes and its Formatter Type is set to Derived From. 

The legend’s colors and labels will be rendered from the derived rules’ color and label, see Rule Sets for more detail. If both cases are true, then the rule values from Fill will be used.

Property Description
Position The location of Legend box on the map.Bottom LeftBottom RightNone: turn off legend.Top LeftTop Right
Title Optional title for the legend box.
Text Color Determines the text color of the legend’s title and key labels.

Step 5: Optional Layers

The Region Map is limited to only a weather layer. For information on other layers, refer to Icon Map.

Weather?

Yes Show a translucent weather layer above the map. Choosing Yes will add another step to the wizard to configure the Weather layer.
No Do not add a weather layer to the map.

Step 5a: Weather

If weather is enabled, an additional wizard step is revealed providing an administrator additional configuration options.

Step 6: Preview

This step previews the end result based on the configuration choices made.

Working with GeoJSON Files

GeoJSON is a format for encoding a variety of geographic data structures. This Visualization uses one file per area to represent the desired regions for display. An area can be a country, state, continent, or any other shape on a map. A way to generate the GeoJSON files is to search for the region by name here:

https://www.openstreetmap.org/

For example, a search for “Texas” there will return a list of entities with matching names. The top item in the resulting list is “State Boundary Texas, United States of America“. Click on that link to go to that page. At the top of the page it says “Relation: Texas (114690)“.

The number in the parentheses is the entity ID. To find the GeoJSON to download for the searched area, enter its ID number into the field labeled “Id of relation” on this page:

http://polygons.openstreetmap.fr/index.py

When submitted, the site returns a list of available polygons for the ID that was provided. The top (or only) row lists the full resolution polygon and the number of points constituting it. For the Texas example, the number of points is over 38k – excessive for use in the Visualization. There is an option to generate a simplified version of the geometry below. Adjust the X, Y and Z fields and submit to generate the reduced version. It is recommended to accept the defaults for Y and Z, but to set X to zero so that neighboring areas do not overlap. For Texas, this produces an object with approximately 800 points. From that entry in the list, download the GeoJSON link, saving it with a .json file extension.

To make GeoJSON files available to the Region Map Visualization, place the generated GeoJSON files into the /custom directory, which is located in the /static-web directory of the edgeCore deployment. You can create the /custom directory if it does not already exist in the /static-web directory.

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