ESA - Eduspace EN - Global Change - Bardia Region Overview - Image processing

Coastal change

Danube Delta change detection Oil spills

Deforestation

Bardia National Park Congo River Basin Kameng-Sonitpur Elephant Reserve Kilimanjaro Rondonia Shillong and Guwahati

Ice

Antarctica 2003 Climate change and glaciers Glacier analysis using radar imagery Glacial retreat in the Alps Glacier Ice Flow Monitoring of glaciers in the Himalayas Remote sensing of ice and snow

Urbanisation

Cairo City of Kathmandu Córdoba Himalayas Kathmandu Valley Lagos

Vegetation

Annapurna Conservation Area Lost in the Andes Ngorongoro Conservation Area Niger Inland Delta Vegetation in South America

Bardia Region Overview - Image processing - Part 3

This excercise is divided into eight parts and requires the use of LEOWorks.

In a greyscale image, it is difficult to identify various Earth surface features with the human eye. It is therefore useful to combine 3 greyscale images into one RGB colour image to increase its interpretability.

In this exercise, three-band composite images will be created by using three Landsat spectral bands to control the amount of red, green and blue in a colour image. The nature of the features being investigated will determine which 3 bands out of the 7 are chosen to be displayed as red, green, and blue.

The true-colour combination requires the Red (band 3 - 0, 63 - 0, 69 µm), the Green (band 2 - 0, 52 - 0, 60 µm) and the Blue (band 1 - 0, 45 - 0, 52 µm) Landsat channels.

Open the LEOWorks programme. If you have not downloaded the images of Bardia yet, go to Download at the top of the Worksheet and follow the instructions.

If they are not on your screen yet, open:

Bardia_Landsat_2002_Band_1.tif
Bardia_Landsat_2002_Band_2.tif
Bardia_Landsat_2002_Band_3.tif

If you haven't done so already, use Interactive Stretching to enhance the contrast of the images.

Use Image>Combine from… to generate a colour image assigning band 3 to red, band 2 to blue, and band 1 to green.

The Karnali bridge of the Bardia National Park (2002)

1. Describe the image in general.

2. Why does enhancing improve the quality of an image?

3. Which features of Bardia can you identify in the Landsat true-colour image? Point to the Karnali bridge (NW corner of the image and the Park), the forests, clearances, agriculture, etc. Which features in the image are clearer?

4. Describe the image by dividing land cover into five groups: forests, grass lands, agricultural lands, rivers and river beds.

5. Why does this combination lead to an image closely resembling a colour photograph? What happens if you change the order? (e.g. Red = band 1, Blue = band 2 and Green = band 3)

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Bardia National Park

Introduction Location Geology and soil Weather and climate People and settlements

Exercises

Worksheet introduction Overview - working on paper prints Bardia Region Overview - Image processing Landscape and land cover dynamics in the Karnali Floodplain Habitat suitability evaluation for rhinoceros in Bardia

Eduspace - Software

LEOWorks 3 ArcExplorer

Eduspace - Download

bardia.zip bardia_paperprints.zip

Resources

Useful links