the transformation dynamically as it displays the image, so that it appears to align with other data in the desired coordinate system. The alternative method is rectification, in which the image is resampled to create a new raster grid that is natively tied to the coordinate system. Rectification was traditionally the only option, until the computing power became available for the intense calculations of dynamic coordinate transformations; even now, drawing and analysis performance is better with a rectified image. Sotware implementations Esri GIS software has had this capability for many years, including the Georeferencing tool in ArcGIS Pro. QGIS has a Georeferencer tool, originally developed as an add-on but now integrated into the software. Image Georeferencing and Rectification in ERDAS Imagine Image to Map Registration in ENVI See also References Further reading External links Discovering Location Indicators of Toponyms from News to Improve Gazetteer-Based Geo-Referencing - paper presented at Geoinfo 2008 Geographical referencing resources for social scientists online tutorial material from the University of Southampton, UK Geographic data and information