Gis

G♯ (G-sharp) or sol dièse is the ninth semitone of the solfège. In the German pitch nomenclature, it is known as gis. It lies a chromatic semitone above G and a diatonic semitone below A, thus being enharmonic to la bémol or A♭ (A-flat).

A Geographic Information System (GIS) is a computer system that analyzes and displays geographically referenced information. It uses data that is attached to a unique location. Most of the information we have about our world contains a location reference: Where are USGS streamgages located?

Geographic information systems allow organizations of all sizes and in almost every industry to better visualize, question, study, interpret and understand the relationships, patterns, and trends in their data.

A working GIS integrates five key components: hardware, software, data, people, and methods. Hardware is the computer on which a GIS operates. Today, GIS software runs on a wide range of hardware types, from centralized computer servers to desktop computers used in stand-alone or networked configurations.

With GIS technology, people can compare the locations of different things in order to discover how they relate to each other. For example, using GIS, a single map could include sites that produce pollution, such as factories, and sites that are sensitive to pollution, such as wetlands and rivers.

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There are different definitions for Geographic Information System, each developed from a different perspective or disciplinary origin. Some focus on the map connection, some stress the database or the software tool kit and others emphasis applications such as decision support.

Roger Tomlinson While digital GIS dates to the mid-1960s, when Roger Tomlinson first coined the phrase "geographic information system", many of the geographic concepts and methods that GIS automates date back decades earlier.

GIS stands for geographic information system, which is a tool that creates, manages, gathers, analyses and maps all types of data. With GIS, you can visualise different types and layers of mapping data to see trends and monitor changes within an area.

Functions of GIS include: data entry, data display, data management, information retrieval and analysis. A more comprehensive and easy way to define GIS is the one that looks at the disposition, in layers (Figure 1), of its data sets.

GIS requires storing of attributes of spatial objects. DBMS are required to handle these data. DBMS functionality can be coded within GIS software or external commercial DBMS may be utilized by GIS. For example, ILWIS software itself handles its attribute data.

Types of GIS Imagery Imagery that is used in GIS can include aerial photos, satellite images, thermal images, digital elevation models (DEMs), scanned maps, land classification maps and surfaces created from a previous analysis that are saved as an image (Managing Imagery with ArcGIS 10).