ISSS608 2016-17 T3 Assign ZHANG YANRONG Visualization

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Page.jpg VAST Challenge 2017 MC3

Background

Data Preparation

Visualization

Answer

Reference

Feedback

 


Please view Visualization for MC3 on Tableau Public

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Background Knowledge

Spectral Bands

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Derived Measurement

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Visualization Tool

Tableau

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Graphs

Choropleth Graph

  • A choropleth chart is a thematic chart in which areas are shaded or patterned in proportion to the measurement of the statistical variable being displayed on the graph.
  • Since we have many measurements such as NDVI, NDWI, NDMI, BSI and AVI, we use Choropleth to represent these measurements on the graph.
  • In order to relate each measurement with its actual meaning, we select appropriate color to show on the Graph.
  • For example, NDVI represent the health of plants so we choose to use Divergence of Orange and Green.
  • Blue for Water, brown for soil, so on and so forth.

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Line Graph

  • Each of the lines in the line graph shown below represent the factor making up the relevant measurement and their average value by month.
  • In this case, we choose NDVI as measurement and the formula of NDVI is (B4-B3)/(B4+B3). Therefore the two factors of NDVI are B4 and B3.
  • From the graph, we can see that there is little difference between B4 and B3 on February, March, November and December.
  • In order to get a clear and obvious outcome, we need to analyze data on other months which differentiate the factors.

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Area Graph

  • The X-axis of Area Graph is the bin of measurement such as NDVI and the Y-axis is the number of pixels in the image.
  • By looking at the Area Graph, the area with high NDVI value can more or less reflect the health condition of the plant on particular date.
  • By comparing two Area Graphs in the same coordinates, we can tell whether the overall health condition of the plant is getting better or not.
  • We can use Plant Region as filter to focus our analysis on the Plant Region.
  • In this graph, the main area with high NDVI value is shifting left from 2014-08-24 to 2015-09-12, which means that health condition of plant is getting worse from 2014 to 2015.

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Histogram

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Dashboard

Home Page

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Introduction

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Main Features

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Determine Features

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Band Distribution

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Boonsong Lake

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Analysis&Insights

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NDVI Comparison

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Interactive Techniques

Name User Interface Description
Single Value List
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Single Value Dropdown List
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Multiple Value Dropdown List
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Value Range Slider
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Hover Highlight Action

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Select Filter Action

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Story

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QGIS

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Image Processing

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Creating feature layer