<b>Measurement of rural areas by using aerial photographs with nominal and medium scale compared with the topographical GPS receiver</b>

Abstract

The present work refers to the planimetric evaluation applied to the Boa Esperança farm, located in Botucatu city by using the Global Positioning System and comparing with the values obtained through aerial photographs. Measurement with a topographical GPS receiver over fifteen points that were considered important to delimit the farm borders correctly was initially made. The data were submitted to the Datageosis software and the area was calculated. After that, using aerial photographs in scales 1:6000 and 1:30000, the farm border area was located and was submitted to a measurement with and without scale correction by using the SPLAN, software that permits the electronic area integration. The results obtained according to the methodology used allowed to verify that an average scale of aerial photographs enabled a great improvement in the area values. The area resulted from average scale 1:30832 is nearest to the measurement made by using the topographical GPS receiver.