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Inspection of the images
 
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Satellite image of Ngorongoro, 25 October 2000
Satellite image (Band1_00) of Ngorongoro, 25 October 2000
We will first work with the images taken on 25 October 2000:
Band1_00
Band2_00
Band3_00
Band4_00
Band5_00
Band7_00

1) Open Band1_00 in LEOWorks.

The images are extracted from a Landsat 7 scene.
 
 
Satellite image of Ngorongoro, 25 October 2000
Satellite image (Band2_00) of Ngorongoro, 25 October 2000
Please use the 'zoom-out' tool to obtain an overview of the image.

2) The image looks grey without contrast. Therefore choose Enhance/Interactive Stretching to improve the contrast of the image. Move the blue and pink lines so that they encompass the area showing the distribution of the pixel values in the histogram.

Try to find the following landscape elements:

  • Almost circular crater
  • Lake in the crater
  • Steep edges around crater rim
  • Different vegetation zones
  • Clouds

3) Choose Image/Measure tool. Select Units/Meters in the Measure tool window.

Click on the start point and the end point and read the length of the segment. Right click to end measurements.

Find the diameter of the crater.

Find the diameter of the lake in the crater.

Draw a profile along the red line.

4) Draw a North South profile.

The height above sea level for the crater lake is 1700 metres, whereas it is of 2300 metres for the crater rim.

Using this information, as well as the satellite image here, draw a line from North to South on rough sketch paper. You will use this profile later.
 
 
Satellite image of Ngorongoro, 25 October 2000
Satellite image (Band3_00) of Ngorongoro, 25 October 2000
Natural colour image
 
5) Open Band2_00 and Band3_00 in LEOWorks and enhance these images using the Interactive stretching described above.

Compare the images. They look different because they are from different parts of the spectrum:

Band1_00 blue light
Band2_00 green light
Band3_00 red light

To make a colour image, select Image/Combine from.../(Red Green Blue).

Select a band combination as shown above and click OK.

Save the image with the name NGO321_00.

Inspect the image. Remember that the colours are the real colours. This means that vegetation shows up as green.

Briefly describe the distribution of vegetation.
 
 


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Ngorongoro Conservation Area
IntroductionBackground
Exercises
Links
The World Factbook - TanzaniaUnesco World Heritage ListUNESCO World Heritage List - Ngorongoro Conservation AreaMonitoring weather and climate from space
Eduspace - Software
LEOWorks 3
Eduspace - Download
Landsat images from 2000 (6.0 Mb)Landsat images from 2001 (6.0 Mb)Landsat images from 2000 and 2001 covering Western part of NCA (1.9 Mb)
 
 
 
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