Need to edit data with no coordinate system. Is this possible?

[RandyMcGregor_BMcD]

I have some feature classes that are not in a coordinate system, and can't be for reasons I won't go into unless it becomes important. Is there any way to overrride the requirement to have a coordinate system for editing?

Thank you,

Randy McGregor.

[JonathanDawe_BAS]

Ahh, noticed that I was in the wrong forum. apologies, my post was not relevant!

[Robert_LeClair]

It feels strange to suggest this workflow, but yes, you can.  Just not using ArcGIS Pro it seems.  Pro wants the user to have a coordinate system always defined for the Map and the layer it seems.  BUT in ArcMap (and I just tested this), you can have a undefined feature class created using the Create Feature Class GP tool and leaving the Coordinate System parameter blank, add it to an undefined Data Frame and create new features.  It works.  But that also begets the question, do you have ArcMap on your PC?

[CalvinHarmin]

I had a use case for this:

I created a 'virtual' unit-less space of sorts to be able to plop down points on a building construction plan view (raster) to represent where our IT department wanted to put in WIFI access points, power outlets, ethernet ports, cameras, etc. For some projects there are multiple floors or buildings, so we could display them all in one building plan (raster) image so it could all be seen at a glance. 

Editing was done through a web map with editing templates for each type of 'thing' that might need to be added to the plan. This could be shared easily internally and with contractors so they could see the plans, and we could easily update and modify, etc.

I did a small presentation on this for fun at some point (attached). 

[RandyMcGregor_BMcD]

Thank you. I knew I had done this before, and that must have been in ArcMap 🙂 We do have it, but I need to develop an ArcPro workflow. I gave the data an erroneous coordinate system, and kept getting 'out of bounds errors.' I used UTM, zone 15 and it worked, so I'll just work with this going forward. What ArcPro needs is a 'Cartesian' coordinate system - 1 to 1 x vs y . Thanks for your input.

[Robert_LeClair]

So I searched the ArcGIS Pro Idea community and found a great read for an Idea plus learned one can set an Unknown coordinate system for the Map View!  The link to the idea is How to clear\define the coordinate system of a par... - Esri Community - and to set the Map View to an Unknown Coordinate system, right-click on the Map view, select properties.  In the Map Properties, click the Coordinate System tab on the left and in the center of the UI, there is the word <Unknown>.  So one item addressed.  But the problem remains, ArcGIS Pro will not let you create a new feature and has the message "no editable layers" - grrrrrr...

[RandyMcGregor_BMcD]

It's the editability that is the issue. Just flat out won't let you do it. Turns out using a phony coordinate system works - Just have the map in that coordinate system and your feature class in that coordinate system. It's a hack, but it works. A straight 'cartesian' coordinate system (like graph paper, no distortion, x = 1,2,3,4, y = 1,2,3,4, etc...) would be awesome.