Explain Longitude and Latitude in tableau?

When you assign a geographic role to a field, Tableau adds two fields to the Measures area of the Data pane: Latitude (generated) and Longitude (generated). These fields contain latitude and longitude values and are assigned the Latitude and Longitude geographic roles.

Longitude and Latitude (generated) fields are associated with the geographical detail present in the data. The dataset should consist of geographic information like City, Country, or State.

The longitude and latitude values are auto-generated in Tableau. These fields can be used to build maps in Tableau.

Assign a geographic role to a field

Assigning a geographic role based on the type of location (such as state versus postcode) helps insure that your data is plotted correctly on your map view. For example, you can assign the City geographic role to a field that contains a list of city names.

When a field is assigned a geographic role, Tableau creates a map view when you add the field to Detail on the Marks card. In other words, Tableau geocodes the information in that field.

To assign a geographic role to a field:

  • In the Data pane, click the data type icon next to the field, select Geographic Role, and then select the geographic role you want to assign to the field.

When you assign a geographic role to a field, Tableau adds two fields to the Measures area of the Data pane: Latitude (generated) and Longitude (generated).

These fields contain latitude and longitude values and are assigned the Latitude and Longitude geographic roles. If you double-click each of these fields, Tableau adds them to the Columns and Rows shelves and creates a map view using the Tableau background map.

Types of geographic roles in Tableau

The following table describes the geographic roles available in Tableau. Many of the roles are international, but some are limited to the U.S. only.

You can assign geographic roles to your fields based on the type of geographic data they contain. For example, you can assign the Airport geographic role to a field that contains International Air Transport Association (IATA) codes.

If your location data does not fit into one of these roles, you may have to import custom geocoding to plot the data on a map. For more information, see Geocode Locations Tableau Does Not Recognize and Plot Them on a Map(Link opens in a new window).

Geographic Role Assign this role to a field if it contains:
Airport International Air Transport Association (IATA) or International Civil Aviation Organization (ICAO) airport codes.
Area Code (U.S.) U.S. telephone area codes; numbers only.
CBSA/MSA (U.S.) U.S. Core Based Statistical Areas (CBSA), which includes Metropolitan Statistical Areas (MSA), as defined by the U.S. Office of Management and Budget. CBSA/MSA Codes and Names are recognized.
City Worldwide cities with population of 15,000 or more. Names are in English (UK or US), French, German, Spanish, Brazilian-Portuguese, Japanese, Korean, and Chinese (Simplified and Traditional).
Congressional District (U.S.) U.S. congressional districts.
Country/Region Worldwide countries, regions, and territories. Names are in English (UK or US), French, German, Spanish, Brazilian-Portuguese, Japanese, Korean, and Chinese (Simplified and Traditional). Tableau also recognizes, FIPS 10, ISO 3166-1 alpha 2, and ISO 3166-1 alpha 3. Names are included in various forms, including long, short, and various abbreviations.
County Second-level administrative divisions for select countries. For example, U.S. counties, French d├ępartements, German kriese, etc.

Note: Second-level administrative division definitions vary by country. In Tableau, all second-level administrative divisions are geocoded with the County geographic role. For more information, see the Location Data that Tableau Supports for Building Map Views section.|
|NUTS Europe|NUTS (Nomenclature of Territorial Units for Statistics) levels 1 - 3 codes. Codes and names, including synonyms, are supported.|
|Latitude|Latitude in decimal degrees. Only available for numeric fields.|
|Longitude|Longitude in decimal degrees. Only available for numeric fields.|
|State/Province|Worldwide state, province, and other first-level administrative divisions. Names are in English (UK or US), French, German, Spanish, Brazilian-Portuguese, Japanese, Korean, and Chinese (Simplified and Traditional). Note: Some names are available only in their local form.|
|ZIP Code/Postcode|ZIP codes and postcodes for select countries. For example, U.S. five-digit zip codes, Australian four-digit postcodes, German five-digit postcodes, etc. For more information, see the Location Data that Tableau Supports for Building Map Views(Link opens in a new window) section.|