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I want to use ArcGIS to map my apartment. How can I create a projection file (with which parameters)?

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    Are you tying in to a monument or is it an arbitrary 1:1 scale? And what are you using to "map" your an apartment...a laser scanner, tape, total stations, etc... If you are using a tape and it's not tied to a monument don't use a projection just draw the thing. – risail Jan 28 '16 at 19:35
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    If you don't need it mapped in real-world space, then you don't need a projection - just draw it. – Midavalo Jan 28 '16 at 19:44
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    Just draw with no projection is not working. Area/length calcs can be affected. I'd say use any local projection, pick any point near the house and go from here – FelixIP Jan 28 '16 at 19:50
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    Just draw it with a "paint" like program and annotate the measurements..GIS software is the wrong tool to solve this problem. And if you are worried about dimensions being affected by the software then you are absolutely using the wrong tool for both the drafting and measuring. Any errors you have will be tied to the surveyor the software is the least of your concerns. – risail Jan 28 '16 at 19:54
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    Please use the edit button beneath your question to improve it with any requested clarifications. For example, it is not clear whether you are looking for someone to suggest a Projected Coordinate System to use or how to create a local coordinate system. – PolyGeo Jan 28 '16 at 21:51
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You do not need a projection if your coordinates are arbitrary. If you are going to use a basemap to pick a corner of the building provided by Arcmap then you are stuck with WGS84. Autocad offers free trial and complete student edition if you are a student. There are many open source drafting programs to choose from but your question does not state an OS so I can't make a recommendation...either way that's an easy search and I am sure it has been covered here.

You could also draw it in paint or some other drawing program and geo-rectify the image in arcmap using satellite imagery.

Here is something to keep in mind: GIS is a poor architectural drafting program and AutoCAD is a poor GIS program.

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    The reference to "WGS84" suggests some confusion between a datum and a coordinate system. – whuber Mar 3 '16 at 19:50
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If you haven't draw it yet...maybe create a map from this site https://www.scribblemaps.com/ .

This is free but if you want more than just free then there's a payment...

What you can do is just draw a polygon and then save the map. Then after that you can send it to kml to bring it up Google Earth Pro ..

Then send kml to ArcMap.

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