WxGUI Map Swipe

Introduction

The Map Swipe is a GUI application which allows GRASS users to interactively compare two raster maps of the same area by revealing different parts of the raster maps. It is useful e.g. for comparing raster maps from different time periods.

The Map Swipe is available in GRASS 7 from the menu

File -> Map Swipe

and will be backported to GRASS 6 after some testing.

wxGUI Map Swipe

Implemented features:

• orientation of the swipe line can be changed (horizontal or vertical)
• zooming, panning
• maps are loaded automatically when opening Map Swipe with two selected raster maps in Layer Manager

Disaster analysis

The Map swipe tool is particularly interesting for pre and post disaster analysis of satellite or other images.

Screenshot of map comparison:

Pre and post disaster images of the tsunami in Japan in 2011. The upper MODIS image taken on February 26, 2011, shows the coastline under normal conditions while the lower MODIS image on March 13, 2011, shows a clear view of tsunami flooding along the coastline. Water, black and dark blue in these false-color images, still covers the ground as much as five kilometers (three miles) from the coast. Source: http://earthobservatory.nasa.gov/NaturalHazards/view.php?id=49634

Video tutorial

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