gis introduction
TRANSCRIPT
OVERVIEW & OVERVIEW & INTRODUCTION to GISINTRODUCTION to GIS
OVERVIEW & OVERVIEW & INTRODUCTION to GISINTRODUCTION to GIS
Ajaze Parvez KhanAjaze Parvez Khan
DehradunDehradun
• London cholera epidemic London cholera epidemic 18541854
Cholera deathCholera death
Water pumpWater pump
SohoSoho
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GIS concepts are not new!GIS concepts are not new!GIS concepts are not new!GIS concepts are not new!
This technology has This technology has developed from:developed from:– Digital cartography and CADDigital cartography and CAD– Data Base Management SystemsData Base Management Systems
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ATTRIBID X,Y1
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ID1
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CAD SystemCAD System Data Base Management SystemData Base Management System
GIS: historical backgroundGIS: historical backgroundGIS: historical backgroundGIS: historical background
GIS: a formal definitionGIS: a formal definition
“A system for capturing, storing, checking, integrating, manipulating, analysing and displaying data which are spatially referenced to the Earth. This is normally considered to involve a spatially referenced computer database and appropriate applications software”
GIS is a System of computer software, hardware and data, and personnel to help manipulate, analyze and present information that is tied to a spatial location –
• spatial location – usually a geographic location• information – visualization of analysis of data • system – linking software, hardware, data• personnel – a thinking explorer who is key to the power of GIS
Geographic Information Geographic Information
SystemsSystems
A Definition of GISA Definition of GIS
Geographic Information Geographic Information
SystemsSystems
A Definition of GISA Definition of GIS
Hardware +Software +Data ware +Human-ware = GIS
What consists “GIS”What consists “GIS”What consists “GIS”What consists “GIS”
What consists “GIS”What consists “GIS”What consists “GIS”What consists “GIS”
What is What is Not Not GIS GIS ??What is What is Not Not GIS GIS ??
• GPS – Global Positioning System
• A static map – paper or digital– Maps are often a “product” of a GIS
– A way to visualize the analysis
• A software package
First Step In GIS : Data For First Step In GIS : Data For GIS ApplicationsGIS Applications
First Step In GIS : Data For First Step In GIS : Data For GIS ApplicationsGIS Applications
• Remote Sensing & Aerial Photography
• Surveying• GPS – Global Positioning
System– accurate locations
• Digitized and Scanned Maps– purchased, donated, free
(Internet)– created by user
• Data Bases – Tables of data
• Raster FormatRaster Format
• Vector FormatVector Formatpoint
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2,5
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4,1
7,105,9
4,7
6,68,6
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line
polygon
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5 10
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as geometric objects:
points, lines, polygons
as image files
composed of grid-cells
(pixels)
Second Step In GIS Second Step In GIS Information/Geographic/Spatial data Information/Geographic/Spatial data
storagestorage
Second Step In GIS Second Step In GIS Information/Geographic/Spatial data Information/Geographic/Spatial data
storagestorage
RASTER - VECTOR Data ModelsRASTER - VECTOR Data ModelsRASTER - VECTOR Data ModelsRASTER - VECTOR Data Models
Geography-Spatial Geography-Spatial DataData
Geography-Spatial Geography-Spatial DataData
• Spatial data is data pertaining to the location and spatial dimensions of geographical entities
• Estimates are that 80% of all data has a spatial component– Data from most sciences can be
analyzed “spatially”
Place namePlace nameGrid co-ordinateGrid co-ordinate
PostcodePostcode
Distance & bearingDistance & bearingDescriptionDescription
Latitude / LongitudeLatitude / Longitude
Characteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial data
LocationLocation
• The shape of a The shape of a building or Citybuilding or City
• The course of a The course of a river, the route river, the route of a roadof a road
• The shape of The shape of the landscape, the landscape, reliefrelief
Characteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial data
GeometryGeometry
Connected toConnected to Within or NearWithin or Near Adjacent toAdjacent to
For e.g. DEALFor e.g. DEAL
Adarsh vihar or Saraswati viharAdarsh vihar or Saraswati vihar Raipur RoadRaipur Road Adjacent to Guru Nanak Academy SchoolAdjacent to Guru Nanak Academy School
Characteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial dataCharacteristics of spatial data
TopologyTopology
• Socio-economic dataSocio-economic data– Regional health dataRegional health data– Consumer / lifestyle profilesConsumer / lifestyle profiles
• Environmental dataEnvironmental data– Topographic dataTopographic data– Thematic data, soils, geologyThematic data, soils, geology
Spatial Data: examplesSpatial Data: examplesSpatial Data: examplesSpatial Data: examples
• Features
– Buildings– Road centrelines– Lamp columns– Road surfaces
Data Modelling - step 1Data Modelling - step 1
Point
Line
Polygon
Data Modelling - step 2Data Modelling - step 2
Feature : Building
Object: Polygon
Entity: Tourist
Information
Bureau
Data Modelling - step 3Data Modelling - step 3
Name : ROMA
Address: 5 Market Place
Town: Kingston
Owner: Ms X
Tel. No: 0181 547 1245
Floor space 1300 sq m
Attributes/ CharactersticsAttributes/ Characterstics
Database“Not Easy to Interpret”
Database“Not Easy to Interpret”
States
Five Data Layers “Alike” FeaturesFive Data Layers “Alike” Features
Roads
CapitalsRivers
Lakes
Visualization “A picture Worth a Thousand Words”
Visualization “A picture Worth a Thousand Words”
In the context of GIS, analysis is...“Deriving new information from existing data”
Some Techniques...
•Simple QuerySimple Query
•BufferingBuffering
•OverlaysOverlays
•Network AnalysisNetwork Analysis
•EtcEtc....
GIS - AnalysisGIS - Analysis
• The identification of objects and their attributes either by location or attribute query.
MapInfoMapInfo
Simple QuerySimple Query
• Creation of an area of interest around an object
Buffering/Proximity AnalysisBuffering/Proximity Analysis
Network AnalysisNetwork AnalysisNetwork AnalysisNetwork Analysis
Network analysis is used Network analysis is used for identifying the most for identifying the most efficient efficient routess or paths for or paths for allocation of services of services.
• Overlaying is superimposing two or more Overlaying is superimposing two or more map layers to produce a new map layer.map layers to produce a new map layer.
• Example:Example:• Roads on one layer(Line)Roads on one layer(Line)• Buildings on another layer(Point)Buildings on another layer(Point)• Parks on the third layer(Polygon)Parks on the third layer(Polygon)
OverlaysOverlays
1. ARCGIS
2. ILWIS
3. ERDAS IMAGINE
4. ERMAPPER
5. GEOMEDIA
6. GRASS (Open source)
7. JTMaps (India) &
8. Free software's (TNTMIPS/GRASS/ARCVIEW3.0
Proprietary S/W sProprietary S/W s
Open source S/WOpen source S/W
Free Software'sFree Software's
GIS SOFTWARESGIS SOFTWARES
Some Ways GIS is Some Ways GIS is UsedUsed
Some Ways GIS is Some Ways GIS is UsedUsed
• Emergency Services – Fire & Police • Environmental – Monitoring & Modeling
• Business – Site Location, Delivery Systems
• Industry – Transportation, Communication, Mining, Pipelines, Healthcare
• Government – Local, State, Federal, Military
• Education – Research, Teaching Tool, Administration
Wherever Spatial Data Analysis is Needed
3D Mine with Well Data3D Mine with Well Data3D Mine with Well Data3D Mine with Well Data
Environmental Monitoring Environmental Monitoring ofof
Toxic PlumeToxic Plume
Environmental Monitoring Environmental Monitoring ofof
Toxic PlumeToxic Plume
Oil Spill and Oil Spill and Contamination estimationContamination estimation
Oil Spill and Oil Spill and Contamination estimationContamination estimation
Modeling of Future TrendsModeling of Future Trends
Thank YouThank YouThank YouThank You