ENVI Experiment Tutorial (1) Familiar with the basic operations of ENVI remote sensing image processing

Experiment 1. Familiar with the basic operations of ENVI remote sensing image processing

1. Purpose of the experiment

1. Familiar with the user interface of ENVI software, including ENVI classic and ENVI5.3
2. Familiar with the basic functional modules of ENVI software.
3. Master ENVI basic data input, output, storage, display and other operations.
   2. Basic requirements of the experiment
4. Carefully read and master the content of this experiment.
5. Save and record the experimental results, and analyze and summarize.
   3. Experiment time and place
6. Place:
7. Time:
   4. Experimental conditions
8. Hardware: PC computer (Windows10 operating system)
9. Software: ENVI 5.3
10. Reference materials: Chapters 2 and 3 of "ENVI Remote Sensing Image Processing Method"
11. Data used: D: ENVI53\data\ qb_boulder_msi
    V. Experimental content
    [1] File system and storage
    [2] Common system configuration instructions
    [3] Menu commands and their functions
    [4] Data input and output
    [5] Data display operation
    6 , Precautions
    1. Install ENVI5.3 on your computer, and copy the CD-ROM data at the back of the textbook to the computer for storage.
    2. Before using the computer, back up the data required for the corresponding experiment with a removable disk for the experiment.
    7. Experimental process and results
    [1] File system and storage
    1. Edit raster header file
    To edit the header file of a file, you first need to open the header file editor. You can select /Raster Management/Edit ENVI Header in the Toolbox, and then select the data that needs to edit the header file.
    
    Raster file saving
    (1) The menu save function
    File->Save As can save the image as ENVI, NITF, TIFF and other format files, and the saved data is the original data without stretching.
    

File -> Chip View To -> File, you can save the image displayed in the current window as an image format such as NITF, ENVI, TIFF, JPEG, JPEG2000, which is equivalent to a screenshot.

File -> Chip View To -> PowerPoint, you can import the image in the current view window into a newly created PowerPoint file.
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(2) Results obtained by processing tools
The results obtained by processing tools in ENVI are all in ENVI standard raster format.

(3) Toolbox save function
Enter Save File As in the Toolbox search box to see the result as shown in the figure. These tools can be used to save files as ArcView Raster, ASCII, CADRG, and more.

[2] Common system configuration instructions
In order to improve the efficiency of ENVI computing, first start > ENVI5.1 > Tools > ENVI Classic, select File > Preferences > Miscollaneous. The cache size can be set to about 50-75% of the physical memory. The Image Tile Size should not exceed 4M in principle. If the memory of the 64-bit operating system is 8g, it can be set to 50-100M.
Open ENVI5.1 main module>File>Preferences, you can set ENVI system parameters.

3] Menu commands and their functions

[4] Data input and output
(1) Opening of common data
In ENVI5.3, use the File –> Open menu to open ENVI image files or binary image files in other known formats.

(2) Opening of specific data
Using the File > Open AS menu, ENVI can read several formats of some standard file types, including selected remote sensing formats, military formats, digital elevation model formats, image processing software formats, and general image formats.

[5] Data display operation

1. ENVI 5.1 Display
Concentrate layer management, image display, mouse information, toolbox, toolbar, etc. in one form

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2. ENVI Classic three-window display
When you open an image file, it will be in an ENVI three-window image display, including the main image window, zoom window and scroll window. The user can also select the menu Enhance in the Display window to stretch the display.

3. Choose a different stretching method in the toolbar, and at the same time, you can choose Custom or the icon on the right to customize the stretching.

4. Each opened file is displayed in the Layer Manager, ENVI will automatically load and display true color or single-band data, and the File>Data Manager list can complete the information of the file currently opened in ENVI or stored in the memory. You can also perform operations including: opening new files, closing files, and viewing metadata

8. Experimental summary and discussion
Preliminary understanding of the ENVI interface, the menu bar, tools, and image display user interface, data input and output, and data display operations.