Selecting many EJscreen layers on your survey's participant map or a mapping question will result in no layer data showing up on the map.

Notice for example, no layers being seen on the map behind the modal with four layers chosen:

This is because of the large amount of data contained in each layer for large populations, and the fact that Google Maps has a limitation of 10 MB.

Try selecting fewer EJscreen layers, reducing the data points to display. Notice in our example above what happens when we uncheck one of the layers - that data now shows on the map:

Try selecting other layers to see more data populating:

If you need to display various layers of EJscreen data, you can make multiple maps for layer comparisons, or add a single EJscreen layer and then add the map image to a report for visual comparison.

You can also add other non-EJscreen .kml/.kmz files – county lines, city limits, districts, or pin points of landmarks or project locations, etc. – to your map. However, the more additional .kml files you add the less data space you have to add multiple EJscreen data layers, especially at the largest percentiles. IT's recommended with this method to start with your EJ layers first.

See also:

Upload KML or KMZ layers to a map question

How to load KML or KMZ files to an interactive map question

How to download map pin data from an Interactive Map question

Exporting your map responses to a GIS application

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