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well come to all

Govardhan LodhaB.Sc.(Ag.) Final YearJ. N. Agriculture University, Jabalpur College of Agriculture, Tikamgarh (M.P.)

J.N.Agriculture University,Jabalpur College of Agriculture,Tikamgarh (M.P.)1

GIS Operation and Data Formation in GIS Image: NASA 2005GOVARDHAN LODHAAKASH SONKUSALESUBMITTED TO :-Dr. M. L. KewatAssociate Professor PRESENTED BY :-PRESENTATION ONJAWAHARLAL NEHRU KRISHI VISHWA VIDHYALAYA JABALPUR M.P.College of Agriculture, Jabalpur

Slides IntroductionGIS OperationsHow does GIS work?Types of data Data Representation Working with GISAn overview of GIS Image

What is GIS?1

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Geographic Information SystemGeographic 80% of government data collected is associated with some location in space

Information - attributes, or thecharacteristics (data), can be used to symbolize and provide further insight into a given location

System a seamless operation linking the information to the geography which requires hardware, networks, software, data, and operational procedures

not just software! not just for making maps!

Many More to ComeEnvironmental impact assessmentResource managementLand use planningTax MappingWater and Sanitation MappingTransportation routingAnd many more ...GIS Operations -

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How does a GIS work?GIS data has a spatial/geographic reference

This might be a reference that describes a feature on the earth using:

a latitude & longitudea national coordinate systeman addressa districta wetland identifiera road name

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Types of dataTwo types of data are stored for each item in the database1. Attribute data:Says what a feature isEg. statistics, text, images, sound, etc.

2. Spatial data:Says where the feature is This also of two types - Vector dataRaster data:

Types of Spatial dataVector For discrete data represented asPointsLinesPolygons (zones or areas)A series of x y coordinates Raster Grid and cellsFor continuous data such as elevation, slope, surfaces

A Desktop GIS should be able to handle both types of data effectively!

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Raster Vector Real WorldData Representation

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A GIS stores information about the world as a collection of thematic layers that can be linked together by geography

Polygon3 Scrub17Very highClayGeography and Databases

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GIS provides Data Integration

VectorsTopologyNetworksTerrainSurveysImagesCADDrawings

AnnotationAddresses

27 Main St.

Attributes

ABC

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3D ObjectsDimensions Roads Land Parcels Population Utilities Land Mines Hospitals Refugee Camps Wells Sanitation

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Working with GIS

Data formation in GIS Capturing data Scanning: all of map converted into raster data Digitising: individual features selected from map as points, lines or polygons Geo-referencing Initial scanning digitising gives co-ordinates in inches from bottom left corner of digitiser/scanner Real-world co-ordinates are found for few registration points on the captured data These are used to convert the entire map onto a real-world co-ordinate system

Generate Image of Real world - Data on different themes are stored in separate layers.

As each layer is geo-referenced layers from different sources can easily be integrated using location.

This can be used to build up complex models of the real world from widely disparate sources.

An overview of a GIS 3D image -

Questions

Thank You !