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Projection Support

You can specify Projection when you write to spatial formats via the Edit Projection dialog box. This feature is supported in these file formats:

  • MID/MIF

  • TAB

  • SHP

  • Oracle

  • ESRI Personal Geo-Database

Select a Projection

If you choose one of the mentioned spatial formats, Projection is visible in the Output Data tool Configuration options. If this box is blank, the default projection for both reading and writing in Alteryx is WGS84.

If you know the projection syntax, you can also enter it into the Projection field.

If you don't know the projection syntax, select the ellipsis icon to launch the Edit Projection dialog box. This dialog box is also available via the Create Points tool's Fields are Projected Floating Points setting.

  • Select Projection: Expand the data trees to expose supported projections and select your preferred projection

  • Find Projection: Enter a keyword related to the projection, then select Find.

  • Custom Projection (Well Known Name/Text): The custom settings for projection should accept the following different forms to define the preferred projection:

    • European Petroleum Survey Group (EPSG) Geodetic Parameter Dataset ID: EPSG:27700 same as British National Grid

    • Well Known Name: "WGS84": same as "EPSG:4326

    • Well Known Text (WKT), which uses at least 2 different dialects:

      • If the dialect is based on OpenGIS Coordinate Transformations specification, the definition does not require a prefix

      • If the dialect is ESRI, the definition has to be prefixed by the string ESRI::

      • The WKT definition could also be a path to file, which contains the WKT definition. If the content of the file is ESRI WKT, then the path has to be prefixed with ESRI::

        • ESRI::C:\projections\british_national_grid.prj

    • Web Map Service (WMS) auto projection: 'AUTO:proj_id, unit_id, lon0, lat0'

    • PROJ.4 - Cartographic Projections Library coordinate system definition: "+proj=utm +zone=11 +datum=WGS84"

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