Bigas Sequential Gis Software

28.12.2020

1.1 What is a GIS?

A Geographic Information System is a multi-component environment used to create, manage, visualize and analyze data and its spatial counterpart. It’s important to note that most datasets you will encounter in your lifetime can all be assigned a spatial location whether on the earth’s surface or within some arbitrary coordinate system (such as a soccer field or a gridded petri dish). So in essence, any dataset can be represented in a GIS: the question then becomes “does it need to be analyzed in a GIS environment?” The answer to this question depends on the purpose of the analysis. If, for example, we are interested in identifying the ten African countries with the highest conflict index scores for the 1966-78 period, a simple table listing those scores by country is all that is needed.

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Gis
Table 1.1: Index of total African conflict for the 1966-78 period (Anselin and O’Loughlin 1992).
CountryConflictsCountryConflicts
EGYPT5246LIBERIA980
SUDAN4751SENEGAL933
UGANDA3134CHAD895
ZAIRE3087TOGO848
TANZANIA2881GABON824
LIBYA2355MAURITANIA811
KENYA2273ZIMBABWE795
SOMALIA2122MOZAMBIQUE792
ETHIOPIA1878IVORY COAST758
SOUTH AFRICA1875MALAWI629
MOROCCO1861CENTRAL AFRICAN REPUBLIC618
ZAMBIA1554CAMEROON604
ANGOLA1528BURUNDI604
ALGERIA1421RWANDA487
TUNISIA1363SIERRA LEONE423
BOTSWANA1266LESOTHO363
CONGO1142NIGER358
NIGERIA1130BURKINA FASO347
GHANA1090MALI299
GUINEA1015THE GAMBIA241
BENIN998SWAZILAND147

Data source: Anselin, L. and John O’Loughlin. Fik shun dance video download. 1992. Geography of international conflict and cooperation: spatial dependence and regional context in Africa. In The New Geopolitics, ed. Reseter printer canon pixma mp258. M. Ward, pp. 39-75.

A simple sort on the Conflict column reveals that EGYPT, SUDAN, UGANDA, ZAIRE, TANZANIA, LIBYA, KENYA, SOMALIA, ETHIOPIA, SOUTH AFRICA are the top ten countries.

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What if we are interested in knowing whether countries with a high conflict index score are geographically clustered, does the above table provide us with enough information to help answer this question? The answer, of course, is no. We need additional data pertaining to the geographic location and shape of each country. A map of the countries would be helpful.

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Figure 1.1: Choropleth representation of African conflict index scores. Countries for which a score was not available are not mapped.

Maps are ubiquitous: available online and in various print medium. But we seldom ask how the boundaries of the map features are encoded in a computing environment? After all, if we expect software to assist us in the analysis, the spatial elements of our data should be readily accessible in a digital form. Spending a few minutes thinking through this question will make you realize that simple tables or spreadsheets are not up to this task. A more complex data storage mechanism is required. This is the core of a GIS environment: a spatial database that facilitates the storage and retrieval of data that define the spatial boundaries, lines or points of the entities we are studying. This may seem trivial, but without a spatial database, most spatial data exploration and analysis would not be possible!

1.1.1 GIS software

Many GIS software applications are available–both commercial and open source. Two popular applications are ArcGIS and QGIS.

1.1.1.1 ArcGIS

A popular commercial GIS software is ArcGIS developed by ESRI (ESRI, pronounced ez-ree),was once a small land-use consulting firm which did not start developing GIS software until the mid 1970s. The ArcGIS desktop environment encompasses a suite of applications which include ArcMap, ArcCatalog, ArcScene and ArcGlobe. ArcGIS comes in three different license levels (basic, standard and advanced) and can be purchased with additional add-on packages. As such, a single license can range from a few thousand dollars to well over ten thousand dollars. In addition to software licensing costs, ArcGIS is only available for Windows operating systems; so if your workplace is a Mac only environment, the purchase of a Windows PC would add to the expense.

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1.1.2 QGIS

A very capable open source (free) GIS software is QGIS. It encompasses most of the functionality included in ArcGIS. If you are looking for a GIS application for your Mac or Linux environment, QGIS is a wonderful choice given its multi-platform support. Built into the current versions of QGIS are functions from another open source software: GRASS. GRASS has been around since the 1980’s and has many advanced GIS data manipulation functions however, its use is not as intuitive as that of QGIS or ArcGIS (hence the preferred QGIS alternative).