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How to build a shopping mall map for Android

I want to create an Android application for a shopping center, so that the user can navigate the map that represents each floor in the shopping center, and calculate the shortest path between its position and the chosen location, a shopping center located in the Middle East, I heard about Google indoor maps but I think I can’t use it, what I need to do for this mall, can I make it 3-D? Any suggestion or articles about this may help.

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This is not a good answer to your question, but I think it will save you some work. The application you are describing will encounter some problems. Basically, if you want to show the user's location on the map of the shopping center and calculate the shortest distance from it. If your shopping center is located indoors, how are you going to get the user's location? GPS is not very reliable indoors, if not everywhere. In addition, you will need a three-dimensional correction to find out what floor it is on.

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