What is Georeferencing
Georeferencing is a Coordinate system of a digital map to a ground system of Geographic Coordinates. A Georeferenced image has been to a known Earth Coordinate system, that is Latitude (Y) and Longitude (X).
Online Georeferencer Tool
In this lesson, learn how to Georeference online, without any software. In this tutorial, I use the Georeferencer site to perform free online Georeferencing.
Online Georeferencing Tutorial
STEP- I : In the Google search engine, search georeferencer.com
STEP- III : On the Homepage, upload unreferenced image or open IIIF (International Image Interoperability Framework).
STEP- IV : Open a map (ex. mexico_city), and collect points (minimum 4) at the same location for both images. (You can also move or cut the point)
STEP- V : Once you have completed the all points, save the image. Click the Save button, appears new pop-up, choose you are like one – i) View this map ii) Compare & Overlay
STEP- VI : Select compare & overlay, and check the accuracy label of this georeferenced image.
One most important drawback of this free online Georeferencing plan, you can’t export ‘GeoTIFF‘ file.