Great initiatives! All the best.  Replies inline:

> Questions:
>
> By using the OSM, can we place a tag for the location of PWD’s residence in
> the map?

You shouldn't do this.  OSM is open to all and even if you got consent
from the respective PWD to map their community, you shouldn't put
personal information into OSM.
You can of course collect them and manage data in your own internal DB.

> We are currently searching but currently having a hard time, how can we
> create a visual presentation using the data in OSM? Like creating a visual
> presentation of heights of buildings for flood map.

Desktop GIS.
Use QGIS and threejs plugin.
See for example:
https://wiki.openstreetmap.org/wiki/File:Quiapo_in_3D.png

Web tools
* https://osmbuildings.org/
* https://demo.f4map.com/

Or build your own:
https://twitter.com/maningsambale/status/822419508421861376

Code is in the tweet.

LMK how can I help.

-- 
cheers,
maning
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"Freedom is still the most radical idea of all" -N.Branden
https://epsg4253.wordpress.com/
http://twitter.com/maningsambale
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