Monday, January 29, 2018

Display CSV (with WKT geometry field) files on Google Maps with this Mapplet

If you want to display a Comma Separated Values (CSV) file with an embedded geometry field in Well Known Text (WKT) format with just an Internet browser, then this Mapplet may be useful to you. Just go to this url https://dominoc925-pages.appspot.com/mapplets/vcsvfile.html with any modern browser such as Chrome, or FireFox. All the processing is done within your browser, that is the CSV file is never uploaded to a server for processing.


  1. To load a CSV file, click on the Import CSV button (in blue color) as shown in the screenshot below. 



    The Import Comma Separated Values (CSV) file dialog box appears.

  2. To load in a CSV file from a local drive, click the Choose File button. Then browse and select a CSV file as shown below.



    Note: You can also copy and paste WKT text into the CSV file field's text area. Or click the Use Sample Data drop up button to load demo WKT data into the text area.

  3. Click Open.

    The file is read and displayed in the text area below the Choose File button. The WKT Geometry column button is populated with the header fields from the CSV file.


    Note: If necessary, choose an appropriate Coordinate System and projection.
  4. Click Start Import.

    The CSV file is loaded and rendered as overlays on the Google Maps backdrop. The name of the file is added to a CSV files combo box.

  5. Optional. Click on the CSV Command drop up button and choose a command to apply to the current CSV layer.


    Fit - Display the current CSV layer within the map
    Fit All - Display all loaded CSV layers within the map
    Toggle display - Toggle the CSV layer display on or off
    Display off - Don't display the current CSV layer
    Display on - Display the current CSV layer
    Remove layer - Unload the current CSV layer

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