Lesson 1, Topic 2
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Mapping urban areas with the Global Human Settlement Layer (GHSL)

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Introduction

Let’s move to the first use case. You will learn how to correctly assess the changes in built-up areas using the Global Human Settlement Layer (GHSL). Before you can start with the hands-on exercise you’ll be shortly introduced to GHSL just to acquire the basic necessary knowledge which will be required in the exercise.

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Data and background

First steps

To start your Analysis, the first step will be to import the right datasets to the code editor in the google earth engine. Some basic code lines later you will be able to get a detailed view of it. After this, you can already visualize your dataset and also refine your first result – just using view simple additional lines of code.

You can find the code used in this video below or by following this GEE Link:

https://code.earthengine.google.com/90a00c0c8e9a55be5f6909c2c221383f

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Exploring the dataset

Code used in this topic:

var dataset = ee.Image('JRC/GHSL/P2016/BUILT_LDSMT_GLOBE_V1');
var builtUpMultitemporal = dataset.select('built');
var visParams = {
  min: 1.0,
  max: 6.0,
  palette: ['0c1d60', '000000', '448564', '70daa4', '83ffbf', 'ffffff'],
};


var builtUp2000 = dataset.select('built').gt(3);
Map.addLayer(builtUp2000, {min: 0, max:1, palette:["white","red"]}, "recent buield up")


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