Paulo

São Paulo city seen from Pico do Jaraguá, its highest point, on a day of temperature inversion during winter. Blue sky contrasts with dense pollution near ground level. Credit: Regina Maura de Miranda/USP People who live in São Paulo city in Brazil certainly recall an event that occurred on August 19, 2019, when dark clouds covered the sky and day turned into night. The phenomenon was not caused by local pollution or emissions…

The Camanducaia is one of the rivers in the PCJ Basin. Credit: Cassiana Carolina Montagner/UNICAMP The Piracicaba, Capivari and Jundiaí (PCJ) River Basin comprises 76 municipalities in São Paulo state, Brazil, with more than 5.8 million inhabitants and a drainage area of more than 14,000 square kilometers. These three rivers and their tributaries are essential sources of drinking water, energy, irrigation for agriculture, and…

The “Surprise Songs” segment for Taylor Swift’s Eras Tour is the gift that keeps on giving. For her second night in São Paulo, Swift unearthed “Safe & Sound,” from the Hunger Games soundtrack, and “Untouchable,” from her album Fearless. It is the first time she has performed either song in over a decade.  “Both songs I am playing tonight I have never, ever played on this tour, so I’m excited” Swift told the crowd on Saturday night, who nevertheless knew every word. “It’s been ages since I’ve played both of…

Singer also dusts off Speak Now's "Innocent" for the first time since the 2010 MTV Video Music Awards Taylor Swift’s The Eras Tour continued its South American leg Friday in São Paulo, Brazil, where the singer performed another pair of deep cuts in the Surprise Songs segment of the show. First, Swift went to her most recent release — 1989 (Taylor’s Version) — for the debut performance of “Now That We Don’t Talk,” one of the vault tracks from the rerelease LP. “I’ve never performed this one…

Paulo Coelho calls Shah Rukh ‘king’, ‘legend’; SRK replies ( Photo Credit – Instagram ; Movie Still ) As the Shah Rukh Khan-starrer ‘Pathaan’ continues to set new records at the box office, the Badshah of Bollywood received praise from acclaimed author Paulo Coelho, who recently took to Twitter and spoke about his ‘king’ friend while calling him a ‘legend’ in the same breath. Paulo Coelho posted a tweet from SRK, which has a video of fans swarming outside his Mannat residence in Mumbai, with the caption, “King.…

Triangles have mighty properties for geospatial queriesPhoto by Pawel Czerwinski on UnsplashTriangles are shapes with many practical geometric properties. In this article, I illustrate using such properties when performing opportunistic optimizations while solving a particular geospatial problem: the recovery of missing map-matched information.I started exploring the Extended Vehicle Energy Dataset¹ (EVED) a while ago to search for compelling geospatial data analysis opportunities in a city road network context. This…

How can we quickly find overlapping trajectories?Photo by Jens Lelie on UnsplashWhile traveling through space, an object describes a trajectory. We can think about a trajectory as a function of time that outputs positions in space. Conceptually, trajectories are continuous functions, although we pragmatically use their discrete versions. A discrete trajectory is a time-ordered collection of points in space where we implicitly assume a linear interpolation between each point. This representation makes storing discrete…

This article explains how to use optimization to perform stratified K-Fold cross-validation on a grouped datasetPhoto by Nicolas COMTE on UnsplashCross-validation is a common resampling technique to get more mileage from your dataset. The procedure involves taking repeated independent samples from the original dataset and fitting them to the desired model. Cross-validation is helpful for model selection, as it provides better generalization performance estimates than the holdout method. The resampling process ensures that…

This article explains how to estimate travel times using known speed vectors indexed by quadkeysPhoto by Dino Reichmuth on UnsplashHow long is your road trip going to last? If you are like me, you go to Google maps or Here maps and query the route directly. You will not only get the fastest or shortest paths, but you will also get estimates of your travel times. These services report the most common speeds according to the learned time patterns and live traffic information and do so for the typical vehicles on the…

Uber (NYSE: UBER ) will start testing this week in the city of São Paulo a function that allows you to record journeys on video. The tool, available through Grip Mobility’s Sentinel partner app, allows drivers to use their cell phone camera to record video and audio from inside the vehicle throughout the journey. This feature is being tested by Uber only in Brazil, and since February it has been available to a limited number of drivers in smaller cities, “where it is possible to analyze the results more…