Using SummaryStatistics for binning data representation.

[GIS_test]

Hi to everyone,

I have a data representation using bins (featureReduction/Type binning).

I would like to be able to use the summary statistics function to obtain the Min and Max values. The idea is to use them as STOPS in my representation.

I have tried the following code:

const featureLayer =

const featureReduction =

const map = new Map({
    basemap: "gray-vector",
    layers: [featureLayer]
    });

  const view = new MapView({
  container: "viewDiv",
  map: map,
  center: [2.333333,48.866667],
  scale: 144447,
  constraints: {
      snapToZoom: false
  }
  });
const my_stats = summaryStatistics({
    layer: featureLayer,
    view,
    field: "aggregate",
    forBinning: true
  });

How can I use the SummaryStatistics function before declaring the Map and View (as I have tried but without success)  ?

[KristianEkenes · Accepted solution]

You cannot use SummaryStatistics for binning before first creating the bins in a view. The binning implementation is purely client-side, so the bins must first be created before they can be queried for statistics. You can use SummaryStatistics to query a feature layer that hasn't yet been added to a map because the statistics query can be sent to the feature server. Because we don't have a server-side binning solution at the moment, the same cannot be done here.

If you're trying to query stats before bins display, I suggest you create the bins with a transparent symbol first, then issue the query and create the renderer and apply to the feature reduction object. That way you won't see flashing when the app starts up.

[GIS_test]

Thank you, it solved my problem well.

One last point that is still strange, I noticed that once the application is open in certain areas, the values ​​change when zooming in or out. Do you have any idea on how to make the display static and not dynamic ?