First the simple version: We work with local people as reporters from the communities and the trees. In Cambodia these are employed directly by us, In Uganda they are staff of our partner, CIDI. They are often somebody with long NGO experience and always somebody well respected in the home area. We then supply them with smartphones, onto which we have installed (open source, free) recording software. This software allows the phone to send the pictures taken (and text recorded, if any) to our server. The server has software that can read the gps coordinates of the pictures, and load them onto Google maps and which also read the recorded text and put it into an Excel file (or similar). The text can be from questionnaires we have designed.
In tech-language: Our ICT specialist (Mr. Lonh Samdy) in Cambodia has built a data transfer API from Android SmartPhones (with the data-recording software) to Google Maps by using KML mapping language. Later, the FUTURIFY company in Vietnam has tailormade a plugin for wordpress that allows us to show maps of our sites, with pictures and other ifnformation on this website (trodaco.com) and also websites of our partners, if they wish.