Shape_length and Shape_Area

[SylvainKerdreux]

Using Json to get back layer's description I do not have shape_length or shape_area :

http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5?...

However if I did a query on this layer :

http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Census_USA/MapServer/5/...

I have two "hidden" fields :
Shape_Length: 34.5280654146724
Shape_Area: 45.1343021062329

so is there any other field which are not present in layer's description but present in a query layer ?

[SergeyMalgin]

Hello!

Shape_Length and Shape_Area are generated by when the data is uploaded into a database. Users do not create these fields.

These fields will be returned only when query asks for a geometry.

As far as I know, there are no other 'hidden' fields.