@PierreA Whats your ideia ? Develop a opensource program, or a comercial one ? How are you developing your program, using Qt & c++ ? Is your target a desktop program or a mobile / tablet application for work on land field ? I'm asking these because some years ago I had started a similar project.

Initially I has developing a cad clone for desktop with Qt widget, but I soon change it to a mobile application (qml & opengl). My main goal was to develop something with a decent touch interface that could be used especifically for land surveying, or cad editing in meetings outside office. I figured that there's already to much cad clones for desktop, where there's a great gap for good touch applications for work outside the office. Problem is that I'm eletronic engineer, I know my ways in eletric plants projects but I dont have knoledge of land surveys.