We proposed a method to compute photosynthesis in response to environmental factors, applying in stadia environment. We managed to visualize heterogeneity of photosynthesis level for turfgrasses used in football pitch. We can not only bring out spatial variation of photosynthesis according to the position on the pitch, but also follow the temporal evolution throughout the year. The gross photosynthesis is evaluated with a model taking into account air temperature, daylength, intercepted irradiance and leaf area index. With a resolution of 7140 surface units, we can obtain daily gross photosynthesis on the whole pitch. This cartography highlights parts of pitch with a deficit of photosynthesis for the plant, and pitch managers could take more attention to these areas.