SOME ASPECTS IN PREPARATION OF TRANSPORT AND FIELD OPERATIONS ON LARGE BULGARIAN FARMS BY USING GPS AND GOOGLE EARTH.

Some problems in preparation of transport and field operations on large Bulgarian farms by using GPS and Google earth are discussed. The experimental investigations were carried out in experimental fields of the Institute of Agriculture and Seed Sciences (IASS) "Obraztsov chiflik" - Rousse. Hardware configuration - single Ashtec12 GPS receiver, GPS antenna, notebook computer, Garmin 205 GPS receiver; software configuration - system software GEOSURF SIZE1000 and Google earth software were used. The method of field experiment includes the next basic steps: measurement the point coordinate of 4 corners of the field, introduction of the work width of the work machine, distance between the GPS - work machine, outline of the field, work course, calculating the distance and route choice between the field and the farmyard, calculating the time for travelling and idle time. In the result of the field experiment a map for realization of transport and field operations in the IASS "Obraztsov chiflik" - Rousse is designed. [ABSTRACT FROM AUTHOR]