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Landmarks in Odelouca

Official designation of the project: Delimitation and placement of Landmarks in Odelouca

Start date: February 22, 2021
Completion date: August 22, 2021

Detailed description: The Land Registry is one of the thematic areas that require the use of topographic data, and during the year 2021 LS Engenharia Geográfica was involved in a wide range of activities in the Land Registry domain. Due to its size, we can highlight the stake out of the perimeter of the Odelouca dam, located in the district of Faro, owned by the company Águas do Algarve, S.A.

The public contract foresaw, in its specifications, the acquisition of services for the delimitation, supply and placement of landmarks belonging to the Odelouca reservoir.

In this sense, and during the 6 months of execution of this project, the two work teams involved used satellite positioning techniques (GNSS) to accurately determine the geolocation of boundaries, in a territory occupied by what is the second largest embankment dam in Portugal.

Given the positioning accuracy required for the execution of this type of work, it was necessary to always guarantee the quality and intensity of the GNSS signal reception, through the installation of emitting bases, via radio, for the GNSS receivers in motion.

According to the rules of the Direcção Geral do Território, the maximum admissible uncertainty for the execution of the Land Registry is equal to or less than 0.40 meters, so the bases installed in elevated areas and in places with known coordinates, transmitted daily the differential corrections in the official geodetic system, essential for positioning operations in RTK mode (Real Time Kinematic), thus ensuring an instantaneous precision that is always superior to what is required.

In a region characterized by rugged relief and dense vegetation cover, as well as by the high temperatures that are felt during spring and summer, different strategies were adopted in day-to-day work, from cutting vegetation to progressing in the terrain, to the use of small nautical means, either as means of transport inside the dam or as transport of material and various equipment.

By the end of July 2021, 1250 concrete marks had been placed on the ground, definitively contributing to the correct identification of the plots and the resolution of conflicts regarding their ownership.

Challenges: Rough terrain conditions with very steep slopes and high density of vegetation.

Advantages: Contribution to the correct delimitation and identification of parcels, leading to the resolution of conflicts related to their ownership.

Areas of Intervention: Topographic Surveys and Land Registry

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