GIS for Starters: Encapsulated basics

Geographic Information System (GIS) is a computer based information system used to digitally represent and analyse various parameters of the globe. Popular use of GIS began in late 1970s and was initiated by Environmental System Research Institute Incorporation (ESRI) of Canada. Much of the credit for the early development of GIS goes to Roger Tomilson, a Canadian GIS specialist.

You may be aware that the earth’s surface not only comprises of spatial attributes, but has non-spatial attributes, which are non-graphic. To put it simply, map features can be quantified in terms of data, such as contours. This is a spatial data.

However when the information provides description about the characteristics of a map and also includes qualitative features, it is categorised as non-spatial. Well, parameters of the globe may have become clear to you, but what does digitally mean? Digitisation is nothing but the conversion of smooth lines, boundaries and so on, into a digital form to allow the computer to read it.

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GIS is a computer-assisted system devised to store, retrieve, analyse and display spatial data arranged in a systematic manner. It can also be defined as a computer based system that provides the following sets of capabilities to handle geo-referenced data: –

  • Data Input
  • Data Management (data storage and retrieval)
  • Manipulation and analysis
  • Data Output
Geo-Reference

In some online mapping service, you may have seen satellite imagery. When these images are captured from a satellite or an airplane, they are just plain images, like photographs. But to display these images on a map, they need to be associated with map coordinates. This process is called Geo-Referencing. Once the image is associated with the map coordinates it can be overlaid on top of street maps.

Geo-Coding

When you type an address or a place name in the search box and in return the map shows a marker at the place. The process of associating an address or a place name with coordinates on the map is called Geo-Coding. In a spatial database this is done as a point layer with name of the place as an attribute to the point location. This is one way of Geo-Coding.

For addresses, the associated coordinates are not saved in a database directly, but computed using a method called linear referencing. The start and end addresses along a line segment are saved and intermediate addresses are interpolated and the coordinates are calculated.

With the knowledge of Geo-Referencing and Geo-Coding, it is now possible to link it to a database, which is nothing but a collection of information about spatial and non-spatial data and their relationship to each other.

figure-2

Software

The software module is the core of GIS and should be application specific. It must be chosen according to the requirement. The functions of GIS software include storage, analysis and display of geographic information. QGIS – Formerly Quantum GIS, gVSIG, Whitebox GAT and SAGA GIS are some of the well-used free GIS softwares.

Map Creation

There are various techniques used for map creation for further usage in planning for a project. The map creation can be done by either an automated raster to vector creator, using vectorisation packages which convert directly from raster to vector, or manually vectorising, using the scanned images. These digital maps may be products of a survey agency or the result of satellite imagery.

GIS’s broad applications work in tandem with various fields from cadastral mapping, which is a map showing ownership of land-usually large in scale to accurately depict individual landholdings, to utility networks, topographic mapping, thematic cartography, surveying and photogrammetry remote sensing, image processing, computer science, rural and urban planning, earth sciences and geography.

It helps in urban planning, housing, transportation planning, architectural conservation, urban design and managing landscapes. Networking and Disaster Management is also its forte.


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  • Context:-

    At the recently concluded Leaders’ Summit on Climate in April 2021, Lowering Emissions by Accelerating Forest Finance (LEAF) Coalition, a collective of the United States, United Kingdom and Norway governments, came up with a $1 billion fund plan that shall be offered to countries committed to arrest the decline of their tropical forests by 2030.

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    What is LEAF Coalition?

    • Lowering Emissions by Accelerating Forest Finance (LEAF) Coalition, a collective of the United States, United Kingdom and Norway governments, came up with a $1 billion fund.
    • LEAF is supported by transnational corporations (TNCs) like Unilever plc, Amazon.com, Inc, Nestle, Airbnb, Inc as well as Emergent, a US-based non-profit.

    Why LEAF Coalition?

    • The world lost more than 10 million hectares of primary tropical forest cover last year, an area roughly the size of Switzerland.
    • Ending tropical and subtropical forest loss by 2030 is a crucial part of meeting global climate, biodiversity and sustainable development goals. Protecting tropical forests offers one of the biggest opportunities for climate action in the coming decade.
    • Tropical forests are massive carbon sinks and by investing in their protection, public and private players are likely to stock up on their carbon credits.
    • The LEAF coalition initiative is a step towards concretising the aims and objectives of the Reducing Emissions from Deforestation and Forest Degradation (REDD+) mechanism.
    • REDD+ was created by the United Nations Framework Convention on Climate Change (UNFCCC). It monetised the value of carbon locked up in the tropical forests of most developing countries, thereby propelling these countries to help mitigate climate change.
    • It is a unique initiative as it seeks to help developing countries in battling the double-edged sword of development versus ecological commitment. 
    • The initiative comes at a crucial time. The tropics have lost close to 12.2 million hectares (mha) of tree cover last year according to global estimates released by Global Forest Watch.
    • Of this, a loss of 4.2 mha occurred within humid tropical primary forests alone. It should come as no surprise that most of these lost forests were located in the developing countries of Latin America, Africa and South Asia.
    • Brazil has fared dismally on the parameter of ‘annual primary forest loss’ among all countries. It has lost 1.7 mha of primary forests that are rich storehouse of carbon. India’s estimated loss in 2020 stands at 20.8 kilo hectares.

    Brazil & India 

    • Between 2002-2020, Brazil’s total area of humid primary forest reduced by 7.7 per cent while India’s reduced by 3.4 per cent.
    • Although the loss in India is not as drastic as in Brazil, its position is nevertheless precarious. For India, this loss is equivalent to 951 metric tonnes worth carbon dioxide emissions released in the atmosphere.
    • It is important to draw comparisons between Brazil and India as both countries have adopted a rather lackadaisical attitude towards deforestation-induced climate change. The Brazilian government hardly did anything to control the massive fires that gutted the Amazon rainforest in 2019.
    • It is mostly around May that forest fires peak in India. However, this year India, witnessed massive forest fires in early March in states like Odisha, Uttarakhand, Madhya Pradesh and Mizoram among others.
    • The European Union’s Copernicus Atmospheric Monitoring Service claimed that 0.2 metric tonnes of carbon was emitted in the Uttarakhand forest fires.

    According to the UN-REDD programme, after the energy sector, deforestation accounts for massive carbon emissions — close to 11 per cent — in the atmosphere. Rapid urbanisation and commercialisation of forest produce are the main causes behind rampant deforestation across tropical forests.

    Tribes, Forests and Government

    Disregarding climate change as a valid excuse for the fires, Indian government officials were quick to lay the blame for deforestation on activities of forest dwellers and even labelled them “mischievous elements” and “unwanted elements”.

    Policy makers around the world have emphasised the role of indigenous tribes and local communities in checking deforestation. These communities depend on forests for their survival as well as livelihood. Hence, they understand the need to protect forests. However, by posing legitimate environmental concerns as obstacles to real development, governments of developing countries swiftly avoid protection of forests and rights of forest dwellers.

    For instance, the Government of India has not been forthcoming in recognising the socio-economic, civil, political or even cultural rights of forest dwellers. According to data from the Union Ministry of Tribal Affairs in December, 2020 over 55 per cent of this population has still not been granted either individual or community ownership of their lands.  

    To make matters worse, the government has undertaken systematic and sustained measures to render the landmark Scheduled Tribes and Other Traditional Forest Dwellers (Recognition of Forest Rights) Act, 2006 ineffective in its implementation. The Act had sought to legitimise claims of forest dwellers on occupied forest land.

    Various government decisions have seriously undermined the position of indigenous people within India. These include proposing amendments to the obsolete Indian Forest Act, 1927 that give forest officials the power to take away forest dwellers’ rights and to even use firearms with impunity.

    There is also the Supreme Court’s order of February, 2019 directing state governments to evict illegal encroachers of forest land or millions of forest dwellers inhabiting forests since generations as a measure to conserve wildlife. Finally, there is the lack of data on novel coronavirus disease (COVID-19) deaths among the forest dwelling population;

    Tardy administration, insufficient supervision, apathetic attitude and a lack of political intent defeat the cause of forest dwelling populations in India, thereby directly affecting efforts at arresting deforestation.

    Way Forward

    • Implementation of the LEAF Coalition plan will help pump in fresh rigour among developing countries like India, that are reluctant to recognise the contributions of their forest dwelling populations in mitigating climate change.
    • With the deadline for proposal submission fast approaching, India needs to act swiftly on a revised strategy.
    • Although India has pledged to carry out its REDD+ commitments, it is impossible to do so without seeking knowledge from its forest dwelling population.

    Tuntiak Katan, a global indigenous leader from Ecuador and general coordinator of the Global Alliance of Territorial Communities, aptly indicated the next steps at the Climate Summit:

    “The first step is recognition of land rights. The second step is the recognition of the contributions of local communities and indigenous communities, meaning the contributions of indigenous peoples.We also need recognition of traditional knowledge practices in order to fight climate change”

    Perhaps India can begin by taking the first step.