Mathieu Cartoixa

Why a re-introduction? Because JavaScript has a reasonable claim to being the world's most misunderstood programming language. While often derided as a toy, beneath its deceptive simplicity lie some powerful language features. 2005 saw the launch of a number of high-profile JavaScript applications, showing that deeper knowledge of this technology is an important skill for any web developer. - Mathieu Cartoixa

Bing Maps provides a world map that users can directly manipulate to pan and zoom. To make this interaction as fast and responsive as possible, we chose to pre-render the map at many different levels of detail, and to cut each map into tiles for quick retrieval and display. This document describes the projection, coordinate systems, and addressing scheme of the map tiles, which collectively are called the Bing Maps Tile System. - Mathieu Cartoixa

I see a lot of people get confused or report problems when attempting to project spatial data to create raster images that line up with the base map layers used in Bing Maps / Google Maps. It’s not helped by the fact that there is a lot of misinformation on the net on the subject. I hope that this post goes someway to helping explain the confusion, and not adding to it… - Mathieu Cartoixa

…or why spherical coordinate systems are not flat! One of the most common ways the round world is displayed on a map is using the simplest projection we have: x = longitude, y = latitude. The name of this projection is “Plate Carree”, and is widely used because it is so simple. However we often seem to forget that we are talking about a projection. Therefore the spatial reference for this projection is very often (mis)referenced as a spherical coordinate system. - Mathieu Cartoixa

SQL Fiddle is a tool for database developers to test out their SQL queries - Mathieu Cartoixa