Geography 338 Remote Sensing

Goals and Background: The goal of this lab was to practice performing geometric correction on digital images. In this lab two types of geometric correction were performed. The following is terminology used throughout this lab Image to Map Rectification- This is when an images data pixel coordinates are transformed, or rectified using their counterpart coordinates on a map Image to Image Rectification- This is similar to Image to Map Rectification, however instead of a map an already corrected reference image is used Ground Control Points- Ground Control Points, or GCP's are paired measurement points used in geometric correction. The higher the distortion, the more GCPs are needed. Spatial Interpolation- When GCP pairs are used to establish a transformation that corrects the pixel value in the output image using the value of a pixel in the input image Intensity Interpolation - When Brightness values are extracted for an X,Y location in the reference image and place i...

Purpose:  The purpose of this lab was to gain basic knowledge of LiDAR data structure and processing. This was done in two distinct phases. The first phase involved the retrieval and processing of surface and terrain models. The second phase dealt with the processing and creation of intensity images and other products using Point Cloud data in LAS file format. The data for this lab was sourced from Eau Claire County and the 6th edition of Mastering ArcGIS by Margaret Price. Methods: The first portion of the lab involved retrieving and processing data for analysis. Because of the very large size of the data, a separate folder was created to store it. The next step was to create an LAS dataset in ArcMap. The dataset was created using Lidar Point Cloud data for the City of Eau Claire The data provided by the instructor was copied into a personal folder and an LAS dataset was created within the LAS folder under the ArcMap catalog. The dataset was renamed and the LAS files were ad...