Collection and Digital Libraries Guide

The “Collection and Digital Libraries Guide” (Guia de Bibliotecas Digitais e Acervos Online, Portuguese only), published by the State Government of São Paulo, Brazil, lists 76 collections and digital libraries with free contents, including images, for consulting and download on different topics. The indicated collections are maintained by important national and international institutions, constituting a wide repository of cultural collections that can contribute to the development of research and motivate the sharing of knowledge in various areas through the internet.


A map that reveals patterns of arrangement of buildings

A dataset containing 125,192,184 computer generated building footprints in all 50 US states is the source for a New York Times’s map of every building in America.

Published on 12th October, this map represents every building in the US by a black speck, reflecting the built legacy of the United States.

The dataset was publicly released by Microsoft early this year. The company’s computer engineers trained a neural network to analyze satellite imagery and then to trace the shapes of buildings across the country.

DNN architecture: The network foundation is ResNet34. The model is fully-convolutional, meaning that the model can be applied to an image of any size (constrained by GPU memory, 4096×4096 in the case).

The map reveals patterns in the arrangements of buildings. Traditional road maps highlight streets and highways; here they show up as a linear absence. As a result, “… you can read history in the transition from curving, paved-over cow paths in old downtowns to suburban sprawl; you can detect signals of wealth and poverty, sometimes almost next door to each other.”.

In the south of New Orleans, it’s possible to notice the layout of buildings along a narrow spit of land on either side of a Louisiana bayou, which may reflect the imprint of the region’s history under France: “… “long lot” development, which stretched skinny holdings laterally away from important waterways. Geography shapes settlement, but culture does, as well.”
Buildings along Louisiana bayou