GIS – 2

What is DATA and INFORMATION in GIS

    Many people think of a GIS as a computer mapping system, its functions are broader and more sophisticated than that. A GIS is a database that is specially designed to work with map data.

     For example, consider the accounting department of the local company. They maintain a large computer database of their customers, in which they store the name, address, phone number. This type of data is called as information or spatial data.

Data

Sample site Vegetation Types

1- Red Mangrove

2- Black mangrove

3-Coconut palm

4- Nut palm

5- Lime

6- Papaya

Information and Data

Collective vegetation types area interpretation vegetation zones

1- Red Mangrove

2- Black mangrove

3-Coconut palm

4- nut palm

5- Lime

6- Papaya

Categories

M – Mangrove

P – Palm

F - Fruit

SPATIAL DATA

        A GIS is a database that is specially designed to work with map data. This type of information is called SPATIAL DATA .  The geographic data in a project can consist of LOCATION, SHAPE and SIZE as spatial data and DESCRIPTIONS and ASSOCIATED DATA as nonspatial attributes.

Spatial data is classified as three main types:

• Point – A point feature is a spot or location that has no physical or actual spatial dimensions, but does have specific location.

• Line – A line is a one dimensional feature having only length, no width. It has a beginning and an end.

• Polygon – A polygon is an enclosed area, a 2D feature with at least three sides and that has area and perimeter, such as parcels of land, agricultural field or political districts.