Lab 4: Polynomial rectification

Introduction

In this lab you will learn how to georeference a satellite image in Erdas Imagine.  

Instructions

Read pages 325-356 of the Erdas Field Guide paying particular attention to pages 331-339 and 342-345. Open the lab book and skim Chapter 6. You can download the tutorial file (lab4.zip) here. You will need to unzip it. Complete the tutorial exercise and produce a map composition with two map windows, the reference image and the georeferenced image. Put your name on it with a text box and print it.  Answer the following questions.

1. What is a transformation matrix?
2. How many GCPs are necessary when doing a 1st order transformation and how do you calculate it?
3. What is the map projection of your rectified file?
4. Write one paragraph directed at the lay person explaining what georeferencing is all about and how you do it.