We can create after and before maps easily using freely available map data and tools. In this post we will learn to make after before slider for OpenStreetMap using tools Maperative, Leaflet and Github pages. We will use the Maperative to create map tiles for older OSM data and Leaflet side by side control to create a before after slider. We will then host the tiles and the before after maps using github pages. We will be making the after and before map of Nepal using the current OSM data of Nepal and the January 1st, 2015 older data of Nepal. We will be using ubuntu 16.04 as our operating system for the tutorial but the tools can be used in other operating systems as well.

World Bank Bhutan in consultation with the Thimphu Thromde partnered with Kathmandu Living Labs(KLL) and Humanitarian OpenStreetMap(HOT) team to start the OpenStreetMap(OSM) movement in Bhutan. The plan was to sensitize the government officials and build their capacity to create and use map data using open source platforms like OpenStreetMap and QGIS. We also had planned on training students from Royal Thimphu College(RTC) on crowdsource gis and mapping in OSM.

A devastating magnitude 7.8 earthquake struck Nepal on April 25, 2015, killing more than 9,000 people, injuring thousands more, and leaving an additional 3 million homeless.