GIS DATA

CONTENT

1. Meaning of GIS Data
2. Sources of Data

Meaning of GIS Data

GIS data are the geographic information used for geographical analysis. GIS stands for geographic information systems.

Sources of Data

There are various sources of data in GIS. They are: land survey, remote sensing, map digitizing, map scanning, field investigation, tabular data, etc.

1. Land Survey:

This is a source of geographic data that is derived from the use of survey instrument using a technique called coordinate geometry. For example, Global Positioning System (GPS) is one of the survey instruments used in capturing data.

2. Remote Sensing:

This is the perception and recording of phenomena by devices which are not in contact with them. That is, it means obtaining information about land, water, or an object without physical contact between the sensor and the object of analysis. Also, it is the collection of data by instruments carried abroad aircraft or satellite. Remote sensing system is commonly used to survey, map and monitor the resources and environment of earth.