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Intro_RS_Assignment2.md

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Shaun Levick GEARS - Geospatial Ecology and Remote Sensing lab - https://www.gears-lab.com

Introduction to Remote Sensing of the Environment

Assessment Item 2 - Spectral properties and indices

The objective of this assessment is to reinforce your knowledge of spectral properties and indices through practical application. The skills required have been covered in Labs 1-3, but some further exploration and independent research will be required on your part. Talk to your classmates and use the Discussion board if you get stuck.

Location

The area of interest for this assignment is the area between berry Springs and Manton Dam in the Northern Territory. The corner coordinates of the area of interest (AOI) are:

1: [130.887,-12.669] 2: [130.887,-12.927] 3: [131.156,-12.927] 4: [131.156,-12.669]

Imagery

Two Sentinel-2 scenes need to be used for your analysis. One collected on 25 April 2018, and one collected on 24 June 2018.

Tasks

  1. Explore the area in the April image and take note of the different landcover types and land-uses within the AOI.
  2. Visually identify the following 7 landcover classes:
    • water
    • savanna woodland
    • monsoon forest
    • mangroves
    • mango orchard
    • sports field
    • cleared paddock
  3. Plot the spectral response curve for each of the 7 classes for the April image
  4. Plot the spectral response curve for each of the 7 classes for June images
  5. Discuss how the spectral response changes with season for each classes
  6. Produce a map of NDVI and NDWI for April and June over the AOI. Use a brown>yellow>green colour scale for the NDVI map, and a white>purple>blue colour scale for NDWI. Discuss the changes that you observe in NDVI and NDWI between April and June.
  7. Calculate the Normalised Burn Ratio (NBR) for April and June. Use the following equation to calculate deltaNBR, which is an estimate of fire severity:

deltaNBR = prefireNBR - postfireNBR

  1. Produce a map of deltaNBR for the AOI with a colour scale from green>yellow>red.
  2. Examine the spectral response curves for some areas with a high deltaNBR and discuss why these changes occur after fire.

Assignment format

Due date : 05 May 2019

Submission format : Single PDF document submitted via in Learnline

Filename format : Lastname_Assessment2_ENVXXX.pdf

Your short report should include:

  • your name
  • your course code
  • title
  • answers in neat paragraphs under appropriate sub-headings
  • clearly captioned figures

Mark allocations

  • Spectral response curve plots and discussion (10 marks)
  • NDVI and NDWI maps and discussion (10 marks)
  • deltaNBR map and discussion (15 marks)

Remember that recorded videos of previous tutorials can be found on my YouTube Channel's Introduction to Remote Sensing of the Environment Playlist.

Kind regards, Shaun R Levick