Mandi Assignment Analysis Procedure

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VAST Challenge 2017 MC 3

Introduction

Data Preparation

Data Exploration

Final Answer


Question 1: Lake Location

As there is no sensor artifacts in the image which is taken on 2016-09-06, I take this image to locate the position of Boonsong Lake.
First, let's find out where are the waterbody in the image then we can narrow the search area.

Map B4, B3, B2 to RGB in QGIS to generate the "false-color" image.
FalseC1.JPG

In this band combination, water is black. Hence, we can identify the main waterbody which have been highlighted with the yellow line in the preserve area as below.
Waterbody1.JPG BLake.jpg
Then we zoom the image in QGIS and compare the shape of these water area with the image of Boonsong Lake. The water area appears in the left bottom corner should be the Boonsong Lake as their shape are the same. The orientation of the supplied satellite image is also the same with the image of Boonsong Lake, which is oriented north-south.

Next, let's calculate the scale of the supplied satellite image.

Question 2: Features in the images

September Analysis

Clustering in Tableau

Question 3: Changes over time

Comparison in June

Comparison in September

Comparison in December