Introduction
The urban building cadastre of Belo Horizonte City is part of the cartography update contract started in 2007 and totalize 85000 real state units visited, which are spread in several sectors and neighborhoods of the city of Belo Horizonte. The process of identification for the units to be visited was performed by the city hall, based on the differences of area, from the existing database information to the new areas obtained by photogrammetric acquisition.
Planning
Due to the characteristic of this property evaluation, the use of electronic data loggers was chosen, since the cadastre is performed for the bigger building block area, task simplified by the use of a drawing module in the data capture software.
Taking as reference the City’s Cadastre Information Bulletin (BIC), a routine was developed inside the software for the storage of the buildings construction characteristics information.
Execution
The city hall turned available the real estate database for the units of their concern per sectors, each sector containing neighborhoods and the lots of concern, all identified for their Tax Identification Number.
Regarding to activities as drawings, building attributes evaluation, building presentation and positioning, the cadastre technicians profile was oriented to professionals and technicians from exact sciences areas, as engineering, architecture, topography, geography, geology and others related courses.
The first trainings were performed by the City Hall Technicians, these trainings used to last a month, four days for theory and the rest for practice. Field activities helped the trainees to better comprehend the city typical construction characteristics.
The data capture software was developed to accomplish most cadastre situations, including area summation by floors, new units insertion and facades photographic record, leading activities and crossing information to conclude each unit cadastre with no lack of information.
Material Preparation
In order to insert the existing information into the data loggers, it was necessary to cut and input the city blocks and the lots of concern, as well as their existing information provided by the City Hall, such as Tax Identification Number, property address, owner’s name and year of construction. This preparation was performed by a two people team, charged to upload data into data loggers, download field data from the data loggers and turn it available for end products generation.
Quality Control
A team composed by 06 people was in charge of quality control of field information, such as facades photographs, properties sketches and construction characteristics information. Based on the first city hall evaluations a bigger control was performed, considering more representative information for the cadastre: construction type, facade photograph scope, year of construction and building area.
Measurements were taken considering the eaves and calculating only built area (wall to wall), these measurements were performed by laser measuring tapes up to 50m.
For each team of 8 cadastre technicians a supervisor was appointed. The supervisor was tasked to elucidate cadastre doubts, to plan and distribute teams to their work zones, to solve problems related to the owners, to control productivity and so on.
For each owner was delivered a letter explaining the reason for the activities, signed by the Secretary of the Municipal Treasury, and the contact number for further information.
Our cadastre technicians were identified by the use of the company uniform and the badge, being oriented to never go to the field without them. They also were trained how to introduce themselves, clarifying the objective of their work, avoiding any conflict with the owner.
Recycling The Teams
Due to service characteristics there was a frequent exchange of personnel, greater than normal, for that reason Esteio kept a training program for new technicians along all the service time, which was executed by experienced Esteio’s technicians. For these trainings many sample images were used, showing construction characteristics such as: roof type; facades; metal frames; fence walls; paving; special equipments (automatic gates, pools, elevators…), and others.
End Products
The end product for each property, delivered to the City Hall, consisted of “pdf” files containing a sketch of the lot, the building measurements, the areas and the photographs, as well as the same information of the cadastre information bulletin (BIC). Considering the entire service, all the units visited, a “txt” file and an “xls” file containing information of the up-to-date data-base.