![]() The data source must contain the coordinates natively. MAKEPOINT can't use the automatically generated latitude and longitude fields. If the optional argument is added, the inputs can be other projected geographic coordinates. Useful for building origin-destination maps.Ĭonverts data from and columns into spatial objects. Supported combinations: point/polygon, line/polygon, and polygon/polygon. Returns true or false indicating if two geometries overlap in space. This function can only be created with a live connection but will continue to work if the data source is converted to an extract. ![]() Returns the distance measurement between two points in the specified. Returns a polygon shape centered over a, with a radius determined by the and values.īUFFER(, 25, 'mi') BUFFER(MAKEPOINT(47.59, -122.32), 3, 'km')ĭISTANCE(SpatialPoint1, SpatialPoint2, 'units') Supported unit names (must be in quotation marks in the calculation, such as 'miles'): Spatial functions available in Tableau AREA Syntax You can use a spatial calculation to see what paths commuters are taking. For example, you might have a spreadsheet of public transportation data that tells you where commuters began and ended their trips. You can also create a line that connects two data points for origin-destination maps. ![]() You can use a spatial calculation when creating your data source to join these files and analyze which district takes the longest to repair potholes. For example, you might have a spatial file of city council districts, and a text file containing latitude and longitude coordinates of reported potholes. 5-digit FIPS County Code.Spatial functions allow you to perform advanced spatial analysis and combine spatial files with data in other formats like text files or spreadsheets. To set a field's geographic role to None, right-click the geographic field in the Data pane and select Geographic Role > None.Īdditional InformationFor more information about how to format postal codes, see Plotting U.S.To change a field into an attribute, right-click the field in the view and select Attribute.To keep the city field on Detail but plot the points in the zip code field, consider changing the city field into an attribute or set the geographic role of that field to None: When the city field is removed, the points in the view shift to show the points associated with the zip code field, because it is the next highest field on the list. Because the city field is higher on the list than the zip code field, Tableau plots the city data points in the view. When you place multiple geographic fields on Detail on the Marks card, Tableau plots the data points in the field with the highest geographic role on this list.įor example, suppose you have a view that uses both city and zip code fields on Detail. Tableau organizes the geographic roles in the following order: These geographic roles are defined by a geocoding database, comprised of latitude and longitude coordinates, that comes with Tableau Desktop. QuestionUnderstanding how geographic roles are defined by a geocoding database in Tableau.ĪnswerBy default, Tableau recognizes a set of geographic roles that can be used to geocode data to create a map view.
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