Checking a SpatialReference is WGS84

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03-30-2020 11:23 AM
AbelPerez
Occasional Contributor II

What is the proper way to check if a SpatialReference is WGS84?

I have tried

Dim sr as SpatialReference = MapView.Active.Camera.SpatialReference

If sr = SpatialReferences.WGS84 Then IsWGS4=True 'doesnt work

If sr Is SpatialReferences.WGS84 Then IsWGS4=True 'doesnt work

If If sr.Name = "GCS_WGS_1984" Then IsWGS4=True 'this works

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AnnetteLocke
Esri Contributor

The easiest way is to check the well-known id.

if (sr.Wkid == SpatialReferences.WGS84.Wkid)

  IsWGS84 = true;

or you could use the hard-coded wkid = 4326. 

if (sr.Wkid == 4326) ... but occasionally these wkids are changed by EPSG so the first way is safer.

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AnnetteLocke
Esri Contributor

The easiest way is to check the well-known id.

if (sr.Wkid == SpatialReferences.WGS84.Wkid)

  IsWGS84 = true;

or you could use the hard-coded wkid = 4326. 

if (sr.Wkid == 4326) ... but occasionally these wkids are changed by EPSG so the first way is safer.

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AbelPerez
Occasional Contributor II

Thanks for the tip.

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