How can I reload KML file and its updated data every 5 seconds - so it will be reflected on the TerriaMaps view.

[eliadd]

Hi,

I am experimenting with the TerriaJS & TerriaMaps solutions.
In my POC I have a KML file with cars that are dynamically changed and therefore the number of cars need to be changed on the TerriaMaps view.

Still, I can only see the initial state of the first KML data and later changes on the KML file are not reflected in the TerriaMaps view.

So my Q - how can I reload the KML file and its new data every 5 seconds - so it will be reflected on the TerriaMaps view.

If you have any other approach to solve this issue - please feel free to elaborate.

Thanks,

[na9da]

Hi @eliadd,

Terria has an auto-refresh feature that works for some catalog items, eg: CSV, CZML - this is currently not implemented for KML.

A simple implementation would be to reload the whole item at specific intervals, but this would be expensive and causes a flicker like in the screencast below.

The underlying Cesium datasource supports an update method which allows updating the network links in a KML file. When used with an appropriate refreshInterval it might be possible to refresh more efficiently (without reloading the whole dataset).

Does your KML use network links? If so are you able to share a sample for testing?

[eliadd]

<refreshMode>onChange</refreshMode>
<viewRefreshMode>onStop</viewRefreshMode>
<viewRefreshTime>7</viewRefreshTime>

[eliadd]

-> I also tried the following configuration on the KML NT link :

[na9da]

@eliadd, I think some of your messages might have got clipped.

From the Cesium code for KmlDataSource, it looks like some of these properties are not supported. You should see a warning in the console for the unsupported ones.

Also, regarding the great feature of TerriaMap story (crating snapshots from TerriaMap view) - how can I save the story I created? - once refreashed - the story is being deleted.

After you have created the story, you can create as share link for it, which will serialize all the inputs - open the share link in another tab to see if it works.

Note that if you added local files to your story, they wont be part of the share link.

You can also optionally enable URL shortening for share links by configuring an s3 bucket in your serverconfig.json to save the share links.

[eliadd]

Thx a lot Nanda!

You have a great product & great support!

Eliad.