RTK network to support the georreferency of rural properties and survey methods

• Grant number: 16/07748-9
• Support Opportunities: Research Grants - Innovative Research in Small Business - PIPE
• Start date: November 01, 2016
• End date: October 31, 2017
• Field of knowledge: Physical Sciences and Mathematics - Geosciences - Geodesy
• Principal Investigator: Marcos Guandalini
• Grantee: Marcos Guandalini
• Company: GPS Agrimensora Eireli - EPP
• City: São Paulo
• Associated researchers: Danilo Aparecido Rodrigues

Abstract

According to INCRA (2010) the word "geo" means earth and to reference is the same as taking as reference point, locating, situating, in other words: georeference is to locate rural property on the Earth, it is to establish an "address" for this property on Earth, defining its shape, size and location through surveying methods describing its limits, characteristics and boundaries using descriptive survey method which should contain the coordinates of the defining vertexes regarding to the limits of the rural properties, georeferenced to Sistema Geodésico Brasileiro, (art. 176, § 4º, da Lei 6.015/75, according to law 10.267/01) The technology and GNSS positioning methods are the tools most used by cartography and topography professionals in the determination of limits of the rural properties in order to meet law 10267/01 demands and pre-established standards besides supply high precision data they allow georeferency to the SGB and UTM coordinates resulted in SIRGAS2000 datum. The georeferency of rural properties is divided into two phases; the first is known as coordinate transport and the second one the determination of perimetric points. Coordinate transportation consists in the definition of the vertex geodetic coordinates and/or particular place milestone, in this case a reference within rural property to be measured, using at least two known references and approved by IBGE. The NRTK of CEGAT service also includes the requested requirements through the Georeferency. In case of using NRTK, the first stage of georeferencing would be dismissed because the transportation of coordinates would not be necessary since NET and virtual base generated for GNSS receiver connection are still linked to the SGB. When working with RTK NET for any application, the great advantage is that it is not more necessary to use a pair of GNSS receivers, Base and Rover as the Base receiver's paper is made by CEGAT and its ERAs, so you can turn a pair of two mobile GNSS receiver and open two fronts. This enables to increase productivity and streamline all processes relating to surveying features on Earth's surface. In order to meet the service mentioned in areas without GSM coverage service; it was created the Virtual RINEX service. In this technique, data is determined by the same principle of RTK NET, however in offline mode. The data from the RTK NET is recorded to the central server and, from these, it is possible to create a raw data file GNSS in RINEX format to any location within the CEGAT coverage area, the user only have to inform the next coordinates of the area where conducted the survey. The data created can be used like a "Base" receiver for the correction of data collected by a mobile receiver that recorded raw data. Then the CEGAT proposal for georeferencing of Rural Property Law 10267/01 is to provide RINEX data to any position within the NRTK network coverage area. The choice to develop, implement and analyze this new methodology applied to the Georreferency is justified due to the fact that Brazil has only about 31,026 certificated rural properties which is less than 10% of existing throughout Brazil. This solution is not restrict to the georeferencing of Rural Property, but can be apply for any user which needs to take a position, independent of the application, like Environmental monitoring, watershed management and CAR (rural environmental registry). (AU)