GIS mapping tool on detailed scale

I'm looking for good GIS solutions that work on a relatively smaller, detailed scale. Specifically, I was wondering what APIs or toolkits are available for mapping out spaces in a building (like rooms, hallways, shelves). This need not be a 3D solution, like one might envisage for architectural CAD-type drawings. Something relatively lightweight would be ideal.

I feel like ArcGIS is a bit of overkill for that, though I may very well be wrong.

Since it's mapping but not quite GPS/routing/distance/Earth/road-type mapping I'm 开发者_Go百科in a bit of a quandary.

Thanks in advance for your input!

The boundary between GIS and CAD softwares depends on the scale and level of detail of your data. GIS are said more suitable for topographic scales (less than 1:10000) with simplified 2D representations, and CAD softs for bigger scales (more then 1:10000) with very detailled representations, usually in 3D. Nevertheless, there is a convergence between both: GIS supports more and more 3D representations, and CAD softs provide some spatial analysis features.

If your purpose is to build a 3D model, I will suggest you a CAD software like blender. You can also have a look at sketchup or the tools used to build citygml data.

PostGIS is available for many solutions, just check wikipedia.