International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences, Volume XXXIX-B3, 2012 
XXII ISPRS Congress, 25 August — 01 September 2012, Melbourne, Australia 
  
d) 
Figure 8: Estimated environment maps: a) Aggregation of sky pixels, b) Perez model and c) Aggregation of corrected sky pixels. 
The aggregation results are cut for angles close to the horizon, where there is no extracted data. d) Difference between aggregated 
environment maps with or without correction (different display parameters). The red deviation of artifacts is highlighted.