ESAEducationHomeWeather and ClimateGlobal ChangeNatural Disasters
Coastal change
Danube Delta change detectionOil spills
Bardia National ParkCongo River BasinKameng-Sonitpur Elephant ReserveKilimanjaroRondoniaShillong and Guwahati
Antarctica 2003Climate change and glaciersGlacier analysis using radar imageryGlacial retreat in the AlpsGlacier Ice FlowMonitoring of glaciers in the HimalayasRemote sensing of ice and snow
CairoCity of KathmanduCórdobaHimalayasKathmandu ValleyLagos
Annapurna Conservation AreaLost in the AndesNgorongoro Conservation AreaNiger Inland DeltaVegetation in South America
printer friendly page
Exercise 3: NDVI dynamics by biogeographical zones

The main objective of this exercise is to compare vegetation for each month of the year 2000 in five different biogeographical zones.

The images used in this exercise are twelve SPOT-NDVI images for the year 2000 in TIFF format. They are numbered 1 to 12: 1 corresponds to January, 2 to February and so on. For each image, you will create subsets for each biogeographical area. You will then calculate the mean NDVI value of each area for each month and create graphs to compare them over time.  
Part 1: Creating the subsets
In LEOWorks the origin of the image is in the top left corner (1, 1) and the end of the image in the bottom right corner (1568, 1703). The ‘X’ represents the latitude (or row) and the ‘Y’ represents the longitude (or column).

The areas we are going to analyse are representative of different types of vegetation and ecosystems, the so-called biogeographical zones.

You can find information on biogeographical zones in the background articles (see right).

The approximate coordinates of our areas of interest are the following:
ZonesMaximum latitudeMinimum latitudeMaximum longitudeMinimum longitude
Rainforest10° S0° S70° W60° W
Tropical dry forest20° S18° S62° W59° W
Temperate forest (broadleaf)41° S40° S73°38’ W72°51’ W
Savannah5° N7° N70° W68° W
Deserts30° S20° S70° W65° W
Dry steppe48° S45° S70° W68° W
Ice sheets52° S47° S74° W73° W



Vegetation in South America
Vegetation in South AmericaMain EcosystemsVegetation IndicesSPOT VEGETATION imageryThe MERIS sensor and the Globcover Project
Exercise 1: NDVI - Vegetation from spaceExercise 2 : NDVI Animation
Eduspace - Software
LEOWorks 3
Eduspace - Download
   Copyright 2000 - 2014 © European Space Agency. All rights reserved.