topic Handling GeoEvents with null values in ArcGIS GeoEvent Server Questions

Handling GeoEvents with null values

BjarkeThormann — Mon, 26 Oct 2020 13:51:40 GMT

I have a field calculator processor for converting x,y-fields to geometries. The expression is: '{' + ' "x":' + POINT_X + ',' + ' "y":' + POINT_Y + ',' + ' "spatialReference":{"wkid":3021} }'

However for some GeoEvents the x,y values are null and and error is thrown in the log, see below.

How can I convert the null values to 0.0?

Preferably all events would have a position, but they don't, and I get so many errors in the log that other important information is hard to find, so it would be better to change the null values to 0.0.

Expression ['{' + ' "x":' + POINT_X + ',' + ' "y":' + POINT_Y + ',' + ' "spatialReference":{"wkid":3021} }'] evaluation failed: operator+(arg0:[NonGroup], arg1:[NonGroup]) evaluation failed because of GeoEvent field 'POINT_X' of type [Double] and value 'null' cannot be used as an argument arg1:[NonGroup]

Re: Handling GeoEvents with null values

Stefan_Jung — Tue, 27 Oct 2020 07:43:40 GMT

Hi Bjarke Thormann‌,

in this case I think using two filters is the easiest option. Maybe it it not the most elegant way, cause you need a positive and a negative filter but it is going to solve your problem.

Positive Filter is just checking if you have a valid geometry and is processing the field calculator like you described. Negative Filter would check if no geometry is available, in this case you could use a copy of you field calculator that is using hardcoded coordinates (0.0./0.0) instead of X/Y.

Like I mentioned, its not so elegant but will work.

Best,

Stefan

Re: Handling GeoEvents with null values

BjarkeThormann — Tue, 27 Oct 2020 10:19:06 GMT

Thank you! I guess that's how to do it.

Confidentiality: C2 - Internal

Från: Stefan P. Jung <geonet@esri.com>

Skickat: den 27 oktober 2020 08:45

Till: Thormann Bjarke (YRD) <bjarke.thormann@vattenfall.com>

Ämne: Re: - Re: Handling GeoEvents with null values

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Re: Handling GeoEvents with null values

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