Hi, I’m new to the forum and I am not sure if this is the right place to post…
I was wondering if there is any way to create openstreetmap-like map from scratch? For example if I want to make an openstreetmap (just for myself) of a video game map, is that possible? If yes what are the required tools?
Okay … then we need more information about your aims:
Is it a quite small area where you can store all objects that you create for your own “world” in a single OSM XML file? This is only suitable for an area that is one small city or one small island like Helgoland, Guernsey/Jersey, Hawaii …
or do you need a bigger area?
Then you need to replicate the whole OSM server infrastructure with an own database, API and webserver.
The map legend that you can see here is entirely fictional data that i created myself. One of the pieces of it lives in a file here that I created initially with JOSM and just later edited with a text editor (which in my case is easy because it’s just a grid of roads).
I didn’t upload it to OSM but I can use that .osm file just like any other extract of data from OSM to create maps with, in my case a process based on this. Depending on what sort of map you actually want (in a web browser? in an app? on a piece of paper?) that approach may or may not work for you.
that is because JOSM is primarily OSM editor. It can be repurposed to projects like making map of fictional area (good luck with it, have fun - sounds like an interesting project!), but it is not the primary or even secondary purpose of JOSM. So it is normal that it will require using some obscure features and it will be necessary to avoid some normal features (for example, avoid uploading it to OSM!).
or do not enter OpenStreetMap credentials in josm. You can have several parallel josm “users” by specifying different settings files on startup, so you could have a user for editing OpenStreetMap and another one for fictional stuff (which won’t ever authenticate with the OpenStreetMap servers)