LiDAR has brought it back

On the same day in 979 that Hisham II became Caliph of Córdoba, Muhammad ibn Abi Amir (Almazor), his most faithful servant, began the construction of Medina Alzahira, the ‘shining city’, a magnificent palace-city to the east of the city and on the right bank of the river. For 20 years, while the Caliph lived locked up in Medina Azahara, the entire peninsula revolved around that small palatial villa. But power is a voracious monster and, more often than not, it ends up devouring oneself. Thus, on February 15, 1009, the people of Córdoba, raised in arms, expelled the weak Caliph, invaded the city of the Amirids, looted its treasures and vandalized it with infinite fury. Shortly after and to ingratiate himself with the masses, the new caliph (Muhammad II) ordered it to be razed, burned completely, forgotten. And boy did he forget. The glow that never goes out completely Torres Balbas explained that the ruin of Alzahira that was so complete that it left no echo of its name in local tradition, nor memory of the place it occupied. According to the historian Juan Quilesthe last historical mention of the ruins of the city is dated June 12, 1172. We had to wait until 1772, when a doctor and writer named Bartolomé Sánchez de Feria recovered the memory of the city and published a hypothesis about its location. There began an incessant search that has not borne fruit in the last two and a half centuries. Progressively, as Professor Quiles explains“the settlement of the Resplendent City has been moving, as if it were a spiral, from the center of the medina to its western end, to then pass along the banks of the river and head towards the east of the caliphal capital.” Now, the University of Córdoba is convinced that the search is over. One thing beneath the surface Antonio Monterroso Checa, a UCO researcher, has just found something near Alcolea, in an area called Cabezos de Las Pendolillas, about 12 kilometers from the city’s Mosque. For this, has reviewed more than 120 hectares in that area thanks to the data of the third LiDAR coverage of the Mining Geographic Institute. And it makes sense. A priori, there are not many more buried structures (compatible with architecture and urban fabric) that could have those dimensions in that area of ​​the river. However, as the authors themselves point outidentifying LiDAR-only structures is unlikely without field verification and is reminiscent of other hypotheses that have ultimately been discarded. A fight revealed There have been no shortage of voices against these findings. Many linked to other of those living hypotheses (such as those of Arenal/Fuensanta), which say that it is hasty to give too much credit to LiDAR without field work. And they are right: it is true that the data provided cannot confirm that the city is down there. However, it should not be ignored that, as they say from the UCO“this is the only proposal, of the twenty-two so far existing on the argument, that adduces certain and verifiable physical data” But it would be naive not to understand that what is at stake here is much more than the location of some stones: the discovery of such a site would be an injection of resources and work for the municipality (and the area). And that, of course, also counts. Image | Sergio Guardiola Farrier In Xataka | We have discovered two “Machu Picchu” lost in Uzbekistan. And that tells us a lot about the Silk Road.

Volvo has equipped its electric SUV with a very potent lidar. So much that the risk of frying the camera of your mobile is real

Volvo has among its ranks a SUV up to technology, the Ex90. Presented in 2023, it is the electrical alternative to the classic XC90, presuming systems such as the Autonomous Level 3 SAE driving or the equipment of a radar Lidar to detect elements of your environment. What perhaps they had not told you is that, precisely, the lidar sensors of greater capabilities are the archNiene of our usual partner: the smartphone. You can leave you the fried camera. Volvo warns him in his own Support page: Lidar light waves can damage external cameras. The technical explanation is brief, but the message is clear. “Do not point a camera directly when Lidar. Lidar, being a laser -based system, uses infrared light waves that can cause damage to certain camera devices. This can include smartphones or phones equipped with a camera.” Although it sounds like a warning, perhaps something alarming, there are already those who have shown in real time how a lidar can instantly disintegrate the pixels of a mobile sensor. They are not color. They are supposedly fried pixels after burning when aiming at a lidar. The lucky one. In Volvo’s subform in Reddit A video has been viralized in which it can be seen how, when recording the lidar of this electric car, the sensor pixels are gradually burned. Reddit is Reddit and no one can ensure the authenticity of the video, but if we understand the theory behind that a lidar can disintegrate a camera, all the pieces begin to fit perfectly. Your camera sensor. Smartphones use sensors that not only capture visible light (spectrum of 380 to 750 Nm), they are also especially sensitive to near infrared (750 to 1100 nm). In fact, they usually come equipped with an infrared cutting filter in charge of mitigating this light and preventing it from affecting the final result. These filters usually block most infrared light, but they are not perfect. An easy test to do at home is to aim with a TV command to the camera of your mobile. That purple flash that you see is proof that smartphones cameras let infrared light. Destroying pixels. The infrared light emitted by a command has barely power, is emitted in a standard frequency of between 850 and 950 nanometers. What happens to the Lidar del Volvo Ex90? That emits pulsed lasers of 1550 nma wavelength in the middle infrared. This is still invisible to the human eye, but it is a considerable power. If a lidar laser with enough power points directly to a CMOS sensor, it can end up saturating the pixels of it. In other words, it can cause permanent damage and load the pixels that have received their emission of light. A phenomenon studied. Although the Lidar del Volvo Ex90 has put this problem on the table, this is a problem that we have been dragging for more than 20 years. In 2004, studies such as “Lase-Induced Damage Thresholds in Cmos and CCD Sensors ” The destruction of both individual pixels and complete columns after being exposed to compact laser systems was shown. It was highlighted how in wavelengths between 800 and 1,600 Nm (just the latter is the one that caresses Volvo), the damage is irreversible and there is no possible physical defense for infrared protection filters. Lidar in the Volvo Ex90 Volvo is not the only one who warns. Smartphones are not the only devices in using CMOS sensors: the vast majority of consumption miral cameras use this technology. Any manual warnsbefore even starting to explain how the camera works, not directly notice with a laser to the sensor. “When you make Tomas backwards, keep the sun sufficiently far from the viewing angle. Always maintain intense light sources, such as sun, laser or artificial light sources, outside and far from the image area. The concentrated strong light could produce smoke or damage the image sensor or other internal components.” At the moment, Volvo is one of the few companies that, together with Luminar (the company behind its Lidar technology) has detailed the emission of laser pulses in this type of radars. It is expected, however, with the democratization of the Lidar (especially in future cars that will come from China), we have to get used to these power figures. Image | Volvo In Xataka | In the war cameras vs lidar, Tesla has a lot to learn from an unexpected product: the Chinese aspiring robot

In the war cameras vs lidar, Tesla has a lot to learn from an unexpected product: the Chinese aspiring robot

Light detection and ranging. Or, what is the same, detection and measurement of light. These are the words behind Lidar. This technology uses light pulses to map the environment and discover each and every corner of a stay or an open space almost in real time, as well as to recreate 3D environments with enormous precision. To understand how a lidar radar works, I recommend watching Mark Rober’s video in which it tells the differences between a car equipped with this system and its tesla, which exclusively uses cameras to detect the obstacles that you can find along its path. Beyond the controversy arising in relation to the tests that Rober does, the video explains well Why Lidar is such a complete system. In a simple way, the system takes advantage of the speed of light to emit infrared pulses. These bounce in the object in question and the system calculates how far that object is using the time that the pulse of light has taken to go and return. As light pulses have a very small size and, as we said, it takes advantage of that very high speed of light transmission, can map the objects almost in real time. In recent days, after Mark Rober’s video, the controversy of whether it is better to use an LIDAR or one system that exclusively use cameras and recreations by software is better or worse to guarantee the best behavior in terms of autonomous driving. A controversy that has left people trying launch your tesla against a wall With a road painted in the purest shyesty style. And it is a long time since it made it clear that I would bet everything on the use of cameras for manage your driving aid systems Or, in the future, completely autonomous driving with the robotaxis that wants to put in the streets. At the time, home vacuum robots also lived this moment of indecision. And along the way, Irobot who was the leading market leader has ended up giving millionaire losses and has seen how Chinese manufacturers have eaten much of the market. The secret of the latter: they use lidar instead of trusting everything to the cameras. What can you learn from a vacuum cleaner “We have substantial doubts”, with these words Irobot owners responded to the question of whether they could move forward with their operations. My partner Javier Pastor explained A few months ago when Amazon raised the purchase of Irobot in 2022 (which fell into regulatory terms) The company had a value of 1.2 billion dollars. In the third quarter of 2024, the calculation was about 200 million dollars. Shortly after, The situation has not improved a lot. In 2024, Irobot lost more than 145 million dollars. However, they had reduced their losses by 52%. The company faced a perfect storm. After spending the worst of pandemic, spending on home robots and other products (such as computers) They collapsed. That coincided with the launch of new Chinese products that were faster and faster than Irobot’s: they used the lidar sensor. This system is ideal for improving the capacities of a vacuum robot. It detects better obstacles, mapping the house more precisely and that translates into faster and more effective work. The result is especially good if it is combined with the cameras and artificial intelligence systems to discover smaller obstacles that can go unnoticed or create confusion. In recent years, that has been the trend of the market in cleaning the home. The combination of this system with a more attractive price He has triggered the sales of Chinese aspiring robots, to the detriment of an Irobot that accumulated more than 60% market share. The comparison with Tesla and the electricity car market is evident. The latter are using Lidar sensors in their cars and offer a product equal to or better than Europeans and Elon Musk’s for a fraction of their price. He Xiaomi Su7 and its wide reception He is being a good example of this. Tesla has long since defends that Lidar are not necessary to improve autonomous driving systems but studies say that, as in the case of vacuum robots, the best performance is signed When both technologies are combinedLidar and cameras. In the case of Xiaomi, the videos shown from How your total autonomous driving system operates They are impressive, with very human behavior and managing the smallest spaces very well. This is possible because, among other things, A lidar is better when calculating distances And suffer less when the light falls. Neither does the risk of the camera be dazzled, At least not intentionallygenerating Ghostly brakes. So far, everything indicates that Tesla does not seem willing to return to anything other than the “All Chamber” To save costs. At the moment it has worked but you have to demonstrate that it is as effective as more advanced systems. And there is also the largest electric car market in the world. In China, where foreigners are suffering from the local product, Tesla is hitting a good batacazo in 2025. Photo | Tesla and Irobot In Xataka | “It’s like living millions of lives”: Tesla trusts their own drivers to advance Waymo and Cruise and shoot their value

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