Peculiarities of the photospheric convection are investigated by means of reproduced spatio-time variations of the temperature and line of sight velocity. The investigations were performed by solving nonequilibrium inverse radiation transfer problem using the neutral iron line λ ≈ 523.4 nm profiles obtained with a high spatial and time resolution. In the middle and upper photosphere, the inversion of temperature fluctuations becomes apparent clearly in large granules and inter granules; for small granules the inversion is found seldom. The discovered large granules are generated by a few ascending flows, which interact between themself in the process of their development. Large granules reach the temperature minimum layers, but the granules of less sizes, that achieve these layers, are found too. The line of sight velocity decreases with height reaching zero in the layers not lower the temperature minimum. We detected sufficient horizontal shifts of the granules and intergranules (500...1000 km) with a velocity of 3 to 5 km/s; that is due to rise up of a new cell.