Photogrammetry - 3D Model and Point Cloud

Photogrammetry - 3D Model and Point Cloud

Advantages of carrying out a photogrammetric project of large areas of land

Photogrammetry - 3D Model and Point Cloud

We carry out a study with the collection of aerial images to obtain a small 3D model and a cloud of points.

What is photogrammetry?

On some occasions we have defined photogrammetry as measuring on photographs. And it is that photogrammetry is a technique whose objective is the study and the precise definition of the shape, dimensions and/or position in space of an object, through the data obtained from one or several photographs.

One of the main applications of photogrammetry is surveying since it allows measuring coordinates in three dimensions and also results in the complex representation of an object in an easy-to-use document. To this is added the instantaneous nature of the record, with the consequent agility to process the information compared to the classic topography.




There are many advantages of photogrammetry over classic topography. How is the agility and speed in data collection. It is also possible to access terrain that is difficult to access and more so today, in which the use of drones in photogrammetry allows reaching all kinds of places.

In addition, the weather conditions do not influence it. In the photographs obtained, all the details of the terrain are recorded continuously, while in the classical topography only points measured in the coordinates are obtained.

There are two types of photogrammetry, terrestrial and aerial:

  • In terrestrial photogrammetry there is a fixed point of view and therefore its coordinates and focus orientation are known.
  • Regarding aerial photogrammetry, the point of view is mobile and provides a wide range of capture, but the position of the camera or its orientation at the moment of shooting are not known, although technology and digitalization of processes can solve these problems.




The method used to obtain these images is as follows:


  • Object photography. To do this, you must first plan the flight (if you are going to opt for aerial photogrammetry) and take pictures so that everything is well programmed and in the necessary conditions. In addition, the survey of ground control points should also be planned using ground photogrammetry.
  • Image processing. Once the photographs are obtained, they must be processed.
  • Orientation of the images. The frames must be placed in the proper position with their trust marks and in the same position as the photographic capture order. To reconstruct and form the model, two systems can be chosen: by restitution or by rectification. When doing it by restitution, the turns, translations and scales are applied. In this way, a coordinate model of the terrain is obtained and the scaling of the object is included to work with real measurements. In the case of doing it by rectification, after the orientation of the light beam (interior and exterior) the intersection between that light and the digital terrain model (DTM) of the space to be determined is achieved.

The applications of photogrammetry are multiple. It can not only be applied in topography, digital cartography, orthophotography, environment and agriculture. It also offers great advantages for other sectors such as archeology and heritage conservation, architecture. In recent times it is also being used a lot in video games or movies, since it is a method that offers great realism.

+34 608 06 34 95 +34 608 06 34 95
This website uses proprietary and third-party cookies to improve the browsing experience as well as for analysis. By continuing browsing, we understand that you agree the use of cookies

What are cookies?

A cookie is a small file stored on the user's computer that allows us to recognize it. The set of cookies help us improve the quality of our website, allowing us to monitor which pages are useful to the website users or and which are not.

Cookies are essential for the operation of the Internet, providing innumerable advantages in the provision of interactive services, providing us with the navigation and usability of our website. Please note that cookies can not harm your computer and, if enabled, they help us identify and resolve errors.

What kind of cookies are used in this site?

Propietary cookies: those that are sent to the user's computer from a computer or domain managed by the publisher and from which provides the service requested by the user.

Third party cookies:those that are sent to the user's computer from a computer or domain not managed by the publisher but by another entity that analyzes the data collected. .

Persisting cookies: a type of cookie in which data are still stored in the terminal and can be accessed and processed by the cookie's responsible.

Analytics cookies: using web analytics to get information on the number of users accessing the site, number of pages viewed, and repetition frequency of visits, the duration, the browser used, operator who provides the service, the language used by the terminal or the city to which is assigned the IP address. Information that allows a better and more appropriate service by this website.

Accept the use of cookies.

We assume that you accept cookies. However, you can restrict, block or erase cookies from this site or any page from the browser settings.

Next you can find the main browsers help pages: