Survey mapped 4 areas between Minas Gerais and Bahia to clarify doubts about the border between the states
A team from IBGE (Brazilian Institute of Geography and Statistics) made, from February 3 to 15, the 1st external work using the area mapping between states, developed by the coordinations of cartography and territorial structures and the management of geodetic and cartographic surveys of the Geoscience Board. The work aimed to carry out the aerophotogrammetric survey of 4 areas located between Minas Gerais and Bahia, to clarify doubts about the border between the states.
It took about 3h45min of flight time to survey the areas, which added 9.3 km², and yielded almost 6,000 photos. The processing of images and production of products consumed 60h, performed on high performance computer.
IBGE currently has 3 drones for mapping, located in state superintendencies in Ceará and Bahia, in addition to the DGC in Rio de Janeiro, which will be used in the areas of geosciences, such as cartography, territorial structures, and environment.
“Using drone helps to gain speed and speed and have a better accuracy of the data. It is a very powerful tool because it allows you to present numerous high quality products for managers of a particular area to do various analysis to assist decision making. This work has the ability to collaborate to improve the management of territorial limits in various areas of the Brazilian territory ”said the manager of geoinformation solutions, Fernando Barroso.
During 2024, drone surveys were conducted together at UFRRJ (Federal Rural University of Rio de Janeiro) and at the IBGE unit in Parada de Lucas. According to the Cartographer and Technologist in Geographic and Statistics Technologist, Luiz Antonio Xavier, the differential of this work now was the use of the drone for a specialized mapping survey to define state limit.
“Now, in addition to mapping and orthomous generation, it has the primary issue of generating digital ground models to define state or municipal limits”he said.
IBGE is not responsible for defining territorial limits, but acts as a mediator and technical consultant providing state managers for the methodology for the treatment of state and municipal territorial issues developed by IBGE and cartographic inputs so that states can later update their limits.
Drone mapping work between Minas Gerais and Bahia was carried out in support of the dealings between the ongoing states in the judgment of Ordinary Civil Action No. 3,609, in process in the Federal Supreme Court.
Drone worked in Rio de Janeiro in 2020
In 2020, some activities with drone use in Sapucaia, Rio de Janeiro (RJ) were carried out. There was an aerophotogrammetric coverage gap in an area of 4 km² and it was necessary to use the drone to complete the coverage of the RJ25 project.
According to Leonardo Scharth, a cartographer and technologist in geographical and statistics, the drone used in these types of works is different from that used in journalistic coverage, for example. It is larger and has a specialized camera to make high resolution image mappings.
“Drone operation brings a new possibility of obtaining data, is another source of information so that we can fulfill the mission of IBGE, which is to portray the country,” stated.
For the use of the drone, it is necessary to register at ANAC (National Civil Aviation Agency), to have an accredited pilot, a flight authorization provided by the Brazilian Air Force Airspace Control Department, informing the place where the flight will be made, make a flight planning before going to the field, and, after the flight, do the processing of the images raised in specific software. Drones used in IBGE field work are used to produce high resolution and accurate mappings from aerophotogrammetric techniques.
The Geoinformation Solutions Manager, Fernando Barroso, received training to operate the drone, and said that “The equipment IBGE has acquired is more for mapping area and can also be used for the environment because, in addition to the RGB camera, which generates colorful images, it also has a multispectral camera, ie it can see other aspects of the image. This multispectral camera can be used, for example, in agriculture, in a region to determine the health quality of a plantation ”.
Jose Henrique da Silva, manager of the Brazilian Territorial Division, pointed out that, in the past, the photography survey was conducted with a conventional aircraft and nowadays the work was facilitated with the use of the drone. “The more sophisticated the drone camera, the better the resolution, and allows you to see more details in the image generated, this results in a better quality product”.
Among the possibilities of drone use in geoscience activities are the production of images of the antennas of the Brazilian continuous monitoring network of GNSS systems to assist in the maintenance of active stations; the elaboration of a three -dimensional image of maregraphic stations; the detailed imaging for the continuous cartographic base; among others.
With information from.
