Avaliação de desempenho de um sistema híbrido de GPS incorporado a dispositivos móveis para a obtenção de levantamentos planimétricos com fins agrícolas

Abstract

Sometimes it is necessary know the area of a given plot for decision-making purposes in the short term, as calculations of the amount of inputs, seeds, machine calibration or estimate the productivity of a given culture. In this sense, tools available for smartphones can be useful by not requiring high level of knowledge or hiring services for this purpose, requiring only mobile internet signal available in the region where the area to be measured is located, and that the device has basic configuration required for the installation of a planimetry application. The objective of this study is to evaluate the accuracy and precision of mobile devices equipped with Hybrid GPS system (A-GPS) as an alternative tool to perform planimetric surveys the field in agricultural purposes. For this, will be conducted experiments evaluating four planimetric survey devices: topographic L1 GPS receivers (receiver A) and navigation (receiver B), and smartphones with Android ™ platform (receiver C) and iOS platform (receiver D), equipped with Planimeter application and 3G internet. With experimental design in a factorial 4x5 (4 devices x 5 areas) with three repetitions, totaling 60 observations. There will also be reviews through the static positioning method, evaluating accuracy and precision of three receivers: B, C e D. With experimental design in a factorial 3x8 (3 devices x 8 vertices) with three repetitions, totaling 72 observations. Satisfactory results were obtained, reaching precisions of up to 2,32 meters and accuracy of 2,07 meters, validating their use as a tool for collecting planimetric data in various agricultural activities.