Using the TravelTime Search API to Generate an Isochrone

GIS Contributor

This step-by-step guide developed by staff at TravelTime shows how to draw a travel time polygon, filter points of interest by travel time and deliver A to B routing information all in one API call.

Map of global travel times.

4D GIS and Prediction

Mark Altaweel

For the last two decades, GIS technologies have increasingly been used to incorporate not only spatial relationships but also analyzing and visualizing space across time. Spatial-temporal GIS, or 4D GIS, has, in particular, become essential in areas where GIS is needed for predicting dimensions across time.

Sunset Over Arctic Ocean

Geography of Daylight Saving Time

Elizabeth Borneman

Not all countries observe Daylight Saving Time, which entails moving the clocks forward an hour in the spring and backward an hour in the fall.

The easiest way to show spatial change over time: side by side maps each showing a slice of time.

Time and GIS: Ways of Representing Time on a Map

Caitlin Dempsey

Spatialtemporal visualization are ways to illustrate changes in an area over time on a map. The famous geographer Immanuel Kant maintained that geography was the study of knowledge in a location, while history was the study of knowledge in time. This article explores different cartographic methods of showing changes in time over space on a map.