We have a great use case for using PostGIS with ArcGIS. The secret is connecting to PostGIS via a query layer. I connect to a view in PostGIS and ArcGIS figures it out just fine (maybe with a little help). Why PostGIS? Because the data is constantly changing. One layer is the current rainfall from our gauges and can change every 2 minutes. Another layer is predicted inundation from flooding. The PostGIS table has numerous areas at various flooding discharges but the view only shows what our models are predicting. This is all behind the scenes and ArcGIS just shows what we want. QGIS does it even better but nobody here uses it.
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