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Archives for July 2022

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July 21, 2022 - No Comments!

Technical assistance on site

At Nova Cartografía we start by carrying out isolated stakeout work and analyse the project in its geometric aspect. We also fit it into the ground and we monitor the execution of the work in terms of stakeouts and measurements.

We carry out the initial detailed topographic survey with the latest technology in GPS receivers and total laser scanner and drone stations. We will make sure that data collection meets the needs of our clients, with all the necessary data for a correct study of the needs of the work.

On-site technical assistance also encompasses all those interventions carried out during each phase of the project that are aimed at ensuring that everything is being done correctly, safely and taking into account the different geotechnical fields that affect the works to be carried out, solving all the unforeseen events that may occur. Technical assistance helps to intervene by minimizing errors and reducing costs in the final resolution of the project.

Checking the stakeout bases, both the precisions and their distribution, the work methodologies, the reference system used, performing precision tachymetric, geometric levelling, all kinds of checks, cubing for monthly certifications and auscultation in all types of works. The topographic bases of the project work are prepared taking into account the times and control of measurements, offering peace of mind in the minimization of errors.

The main services we offer at Nova Cartografia are mobile mapping, track trolley, track auscultation, laser scanner, drone mapping, and BIM, among others. Our services intervene in the construction process in all its stages: from construction to maintenance once the work has been completed.

Our experience covers linear works, structures, railway works, dams and channeling, urbanizations, deformation control, etc.

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July 18, 2022 - No Comments!

Laser scanner: versatility in data collection

Laser scanner technology offers high accuracy in measuring objects or surfaces located within a limited radius. It offers the opportunity to be able to transfer any object or terrain to a plan or model, with high precision. Laser scanner devices work by using laser waves that calculate the varying lengths of nearby objects, which can be observed on the scanned surface.

Initially, it is based on a detailed study of the type of work and its needs, the characteristics and dimensions are two fundamental factors to be able to prepare and calculate the field work properly.

Planning in the use of laser scanners is essential to improve productivity and work efficiency. At Nova Cartografía we have different types of laser scanners, and we evaluate which one is optimal for each project.

  • Optimal equipment and instruments
  • No. of scans and position
  • Time Spent Estimation
  • Georeferencing coordinates

When collecting data, we select the resolution according to the ambient light intensity and the desired quality. We position targets,  support targets that will serve as a reference to unify the different scans with higher precision. The laser scanner measures millions of points with high precision and in a short period of time. Sometimes you will need to make different captures from different stations or positions to ensure complete coverage.

The methodology followed by the use of laser scanners serves to collect information in the area of intervention, allowing important information to be seen between the points.

To talk about laser technology is to talk about millimetric precision. This quality guarantees its corresponding calibration:

-Point cloud in open format: they will provide the necessary information to later process the data.

-Delineation required at each step: with great precision it will allow the client in future consultations to access to be able to make new modifications in the project/work.

The objectives to be developed in a laser scanner job are based on anticipating conflicts, being an easy way to save on execution costs. The intervention has to be analysed using real models of alternatives, ensuring a survey of plans with high millimetric precision. The distinction in a high-precision technological service gives confidence to your customers and ensures greater efficiency in the service. The potential of the object allows the real object to be transformed into a virtual one and to be able to make certain changes to it by manipulating it until the desired result is obtained.

In the laser scanner there are two types of sensors, short and long range, depending on the size of the type of object; it is the scanner itself that calculates the distance from the object using its laser light beam.

The performance of the station helps to obtain measurements with the required accuracy, evaluating workflows and not just the speed of points per second.  Reconnaissance of the intervention area to collect information is essential to be able to organize the necessary sweeps of the surface to be analyzed.

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July 15, 2022 - No Comments!

Track assembly with track trolley

At Nova Cartografía we start from a study of the parameters of the track on which we start, certifying the necessary lifting and ripping of the track. The track trolley helps to avoid having to pass through the same point with the total station, since with the trolley we manage to obtain all the necessary parameters: level, width/cant and arrow handles. We continue with the control and analysis of the existing network, taking a reference system.

Then we go on to implement the network, obtaining the topographic and altimetry network, executing the works and subsequently monitoring  them.

The speed of the track carriage demonstrates a great ease to export graphs and tables of observed data, giving the tamping machine real-time data on the track condition and also export the data to provide it without edits. All this together with a smaller mesh pitch without having to reduce productivity. Various  phases are included in track assembly:

  • Ballast spreading        

 

 

 

 

 

  • Sleepers placement on track

  • Rail distribution and track assembly

  • Leveling and stabilization

  • Railroad Qualification

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July 13, 2022 - No Comments!

Precision photogrammetry: value to information

It is one of the techniques with the greatest precision and with which we manage to provide value to information. The photogrammetry technique can be performed both on the ground and in the air. In the latter case, we have a minimum cost budget, since little infrastructure is required to take photographs.

 

During drone photogrammetry:

  • Capturing aerial photographs
  • Processing using specific programs to obtain 3D models and orthomosaics, obtaining accuracies of around 1 cm in planimetry
  • We obtain digital cartography and orthophotos of maximum precision, especially in areas of difficult access, avoiding endangering field personnel

Among the most outstanding standards, we highlight the ease of obtaining a large amount of graphic information of the area where the survey has taken place, the efficiency when representing the surface with points and the final cartography obtained. By using this technique, we obtain quantifiable information from the terrain and physical objects, reconstructing the environment digitally through georeferencing and high-resolution aerial photographs, using the superimposition of photos to generate 2D and 3D products. Using drones to map large areas, compared to terrestrial surveying, results up to 80% faster in surveying operations.

Photogrammetry helps to obtain high-resolution orthomosaics and 3D models with a very high level of detail in areas where detailed information is not available. They are executed quickly with precision and accuracy, providing much more detailed information.

Work site monitoring is also carried out to certify earth movement, obtaining the digital model of the terrain of inaccessible areas and even  360º photos.

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July 6, 2022 - No Comments!

Topographic network: infrastructure design

The distribution of topographic networks is an essential element in planning activities at any level

Topographic networks are the great basis for being able to execute all kinds of infrastructures based on preliminary studies and to be able to define the quality of the observations, the most suitable and appropriate action methodology for the achievement of the expected results.

The distribution of topographic networks is an essential element to give high precision to topography and cartography, on which the various activities that take place on the territory are projected, such as planning at any level. Network observation is carried out using the topographic network to densify the geodetic network. It is essential to create geodetic reference systems, designed in the pre-selection of vertices in the work area. The design created depends on:

  • The work to be done
  • The land where it is going to be carried out
  • The cost

The previous design of the topographic network must be checked in the field. Observed angles are corrected, giving different horizon turns in each station and the reduction of eccentric stations.

Once all the data has been compiled, the offsets must be made, which provide three-dimensional Cartesian coordinates or geodetic coordinates. The measurements must be organized by assessing the number of satellites, the geometry, among others.

Also noteworthy is the N.A.P (High Precision Leveling Network) through which the geodesic network can be linked to provide a greater height adjustment and improve its altimetry accuracy. In this way, the vertices of our topographic network can be designed, materialized and coordinated, constituting the bases of support among large multitudes of works. The great usefulness of topographic networks lies in the amount of information they offer about the territory, in addition to the value they provide.

At Nova Cartografia we are specialists in the materialization, observation and calculation of geodetic networks of the highest precision for large linear projects where reliability and accuracy are essential for their correct execution. Contact our team for more information.