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Drive-time Isochrones from a single Shapefile using QGIS, PostGIS, and Pgrouting

This is a guest post by Chris Kohler @Chriskohler8.


This guide provides step-by-step instructions to produce drive-time isochrones using a single vector shapefile. The method described here involves building a routing network using a single vector shapefile of your roads data within a Virtual Box. 2,702 more words


Gestores de Base de Datos: PostgreSQL, MySQL, Oracle

Un Sistema de Gestión de Base de Datos -SGBD- (DBMS por sus siglas en inglés “DataBase Management System) es un software que permite definir, manipular y consultar una Base de Datos. 303 more words

Ciencias De La Información Y Computación

Code Organization, Sequelize and PostgreSQL...and Huh?

Week 7 project, called Gabble turned out to be one of the most challenging and confusing projects I have encountered. The purpose of Gabble was to build a social network for students where it contains users, public messages, and likes. 413 more words

How To Code


Just thought that I would start a blog along as motivation to document and create interesting content on my direct technological explorations into data and tools around it.  90 more words


Postgresql vs Oracle


While trying to learn to work with Postgresql I did a lot of reading from its online documentation, this is my notes on the differences and similarities between Oracle and PostgreSql databases. 1,762 more words


Why you should definitely learn SQL Window Functions

Follow @vlad_mihalcea


I found this question on the Hibernate forum, and it’s a very good opportunity to show why mastering Windows Functions is a very important skill for any backend software developer. 923 more words


The ultimate cheat sheet for web development

The large amount of information that you can find on the Internet about almost any topic has its downfalls. It’s very hard to summarize and extract all the relevant information from it. 408 more words