I Neema Alphonce, a mapper at Humanitarian OpenStreet Map Tanzania(HOT) and Open Map Development Tanzania (OMDTZ) . I started working since July, 2017as volunteer and participating in different projects such as Dar es Salaam Flood Resilience, Minigrid Tanzania, Zambia and still participating in Western Tanzania Roads project which is in progress. In January 2018 i became a mapper supervisor which i was responsible to provide training on how to map or digitize and to do validation to new mappers. So i gained much experience in digitization and validation of buildings and roads. For more information contact me on my email ( alphonceneema15@gmail.com ) thank you.