During last week I made alot of boundary logs with site mate 6.8 and then imported them into farm site 6.8 For example the area (calc) in site mate was 20.3 ha, after importing into farm site and defining the object the same area was calculated as 19.79 ha. This might be a problem with the calibration of the orthophoto wich I use as backdrop. Being confused about this I uninstalled version 6.8 of both programs and reinstalled the formerly used version 6.52 of farm site and site mate. In this version of site mate the same log is calculated with 21.22 ha. In farm site the area remains 19.79 ha. All settings are metric. In need some information to handle this. Some knowlege about the reliabity of the calculated area is very imporant because it´s basic for the communication with our local authorities.