DOC PREVIEW
CU-Boulder GEOG 5093 - Exploring Some ENVI Features

This preview shows page 1 out of 2 pages.

Save
View full document
View full document
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience
Premium Document
Do you want full access? Go Premium and unlock all 2 pages.
Access to all documents
Download any document
Ad free experience

Unformatted text preview:

1 Remote Sensing of the Environment GEOG/GEOL 4093 Fall Semester 2011 Exploring Some ENVI Features 12/02/2011, Due: 12/02/2011 The objective of this lab is to practice some other ENVI features. Part I Navigate to Z:\Geog Files\Hart\rs4093 and copy the folder “Lab_12_1” to “D:” drive 1) Open the files in D:/Lab_12_1 a. Open the aerial photos (40105A3NE.tif; 40105A3NW.tif; 40105A3SE.tif; 40105A3SW.tif) in ENVI. b. Open the Digital Elevation Model (DEM) file “Boulder.dem” using File>Open External File>USGS>DEM> USGS DEM Input Parameters window appears, select Output Result to Memory, and hit OK. 2) Mosaicking The photos represents 4 parts (NE, NW, SE, SW) of Boulder, to combine them in one image we can use the mosaicking feature in ENVI. The Georeferenced Mosaicking is used to automatically overlay multiple georeferenced images. Select Map (main ENVI menu)>Mosaicking>Georeferenced, Map Based Mosaic window appears, Select Import> Import Files, import the 4 photos one after another or all at once. To mosaic select File>Apply and add the image to Memory and load it into a separate window. 3) Associate Boulder image to Boulder.dem Select File (main ENVI menu)>Edit ENVI Header>Input File (Boulder mosaic image in memory), hit ok, Header Info window appears, from Edit Attributes select Associate DEM File> DEM Image. Display Boulder mosaic image. 4) Add color scheme to your image Select Tools>Color Mapping>ENVI Color Tables, select a color scheme that is suitable to identify the features in your image. 5) Display the colored image in 3 dimensions Display the image in 3 dimensions by selecting Tools>3D SurfaceView, 3D SurfaceView Input parameters window appears, check 512 and uncheck 64 and hit ok. In 3D SurfaceView window select Options>Surface Controls, make fun with different features (e.g. change vertical exaggeration, let it moves, etc…).2 Part II Navigate to Z:\Geog Files\Hart\rs4093 and copy the folder “Lab_12_2” to “D:” drive First open the aerial photos Boulder and Boulder_Geo in D:/Lab_12_2 in ENVI and display the two images. Registration Registration is used to reference images to geographic coordinates and/or correct them to match base image geometry. In this exercise we will georeference the Boulder mosaic aerial photo using the same georeferenced image (this is to make the exercise much easier, however you can use any other georeferenced image from the same sensor or any other one, or we can use a map). You have to select ground control points (GCPs) from Image windows. Please, follow the following instructions in order to Georeference Boulder image from Boulder_Geo image: a) Select Map (main ENVI menu)>Registration>Select GCPs: Image to Image (Image to Image Registration Window appears). b) Select Boulder_Geo Display for Base Image and Boulder Display for Warp Image and hit OK, the Ground Control Points Window Selection appears. c) Hit Show list, empty Image to Image GCP List appears (because we do not select any point yet). d) Select 4 GCPs, one after another (you have to select at least 4 GCPs in order to register an image), and hit Add Point, it appears on Image to Image GCP List Window, please Observe the Error and RMS. e) After you completed the selection of the 4 points, Select Options (Ground Control Points Selection)>Warp File Input Warp Image Window Appears, Select Boulder and hit OK, put the output image to Memory. f) Display the resulted image and discuss what happened? g) Add more 4 points and Warp the image again and put it to Memory. h) Discuss any differences (if any) between georeferencing using 4 points and 8 points, and also compare both of them to the original image? Overlay Grid Lines (Latitudes and Longitudes) Select Overlay (Image Window)> Grid Lines, Grid Line Parameters Window appears, turn off Pixel Grid (if not already) and Map Grid, and place 1 instead of 5 in Spacing of the Geographic Grid, and hit apply. Select Options (Grid Line Parameters)> Edit Geographic Grid Attributes, Turn Lines and Box on and play with it (Change the color of lines, Font of text,


View Full Document

CU-Boulder GEOG 5093 - Exploring Some ENVI Features

Download Exploring Some ENVI Features
Our administrator received your request to download this document. We will send you the file to your email shortly.
Loading Unlocking...
Login

Join to view Exploring Some ENVI Features and access 3M+ class-specific study document.

or
We will never post anything without your permission.
Don't have an account?
Sign Up

Join to view Exploring Some ENVI Features 2 2 and access 3M+ class-specific study document.

or

By creating an account you agree to our Privacy Policy and Terms Of Use

Already a member?