Tools to examine Land Use change

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Tools to examine Land Use change

• iGETT Project LU_2
• Barbara DuFrain

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Objective

• 1. Introduction to Landsat.
• 2. Open a Landsat scene file.
• 3. Display a gray Scale image.
• 4. Examine the header information.
• 5. Display an RGB and others.
• 6. Perform Image Enhancement.
• 7. Link Displays between two images.

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Objective 1What is happening in our World?
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What is happening locally to our environment?
Gulf of Mexico
Corpus Christi Bay
Corpus Christi
LandSat 7, Geocover 2000
Intercoastal
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Previous.
LandSat 7, Geocover 1990
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Another view
Landsat 7 Visible Color NLT
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What is Electromagnetic Spectrum
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Spectral sensitivity of Landsat 7 Bands.
Band Number Wavelength Interval Spectral Response
1 0.45-0.52 um Blue-Green
2 0.52-0.60 um Green
3 0.63-0.69 um Red
4 0.76-0.90 um Near IR
5 1.55-1.75 um Mid-IR
6 10.40-12.50 um Thermal IR
7 2.08-2.35 um Mid-IR
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Objective. (2) Open a landsat scene
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Open External FilegtLandsatgtGeoTIFF
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Select all files with .tif
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Objective (3) Display Gray ScaleAvailable Bands
List
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Three steps

• Select Band 1 _b10
• No display gt New display
• Load band.

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Example _b10
1.
3.
2
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Objective 4Display a gray scale image
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Area of StudyDisplay Gray scale image
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(No Transcript)
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Band 4
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B61.tif
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B62.tif
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_b70.tif
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_b10
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Objective 4.Look at the header information
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Map Info _b10
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Map Info _b61
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Map Info _b8
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Edit Envi Header
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Edit band 1
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2
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Results
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Step 2. Edit geographic attributes.
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Step 2. Geographic corners.
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Objective 5.Display an RGB Image

• Digital cameras
• Incoming visible light
• Color filters pass most of their own color

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Available bands list
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Bands 3, 2, 1
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Another Display RGB Image
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4,3,2 Bands
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Bands 7,4,2
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Bands 4, 5, 3
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Objective 6.Perform Image Enhancement Image GUI-
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Linear Stretch
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Linear 0-255
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Linear 2
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Objective 7. Link Displays

• 3,2,1

• 4,5,3

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Tools--gtLink--gtLink Displays
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Action GUI
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Move the red box around.
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Review

1. Introduced Landsat
2. Opened a Landsat scene
3. Displayed a gray Scale image?
4. Examined the header information?
5. Displayed an RGB and others
6. Perform Image Enhancement
7. Link Displays.