QUERY AND NETWORK ANALYSIS IN GIS
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Transcript of QUERY AND NETWORK ANALYSIS IN GIS
GEOSPATIAL TECHNIQUES(CE-645)
QUERY AND NETWORK ANALYSIS
Civil Engineering Department, M.Tech (Urban Planning), Semester-1
GUIDED BY:- SHRI. RAVIN TAILOR
PREPARED BY:- DEVANG D KAPADIA
ROLL NO. :- P15UP009
CONTENTS
1. INTRODUCTION2. QUERY3. NETWORK ANALYSIS4. USE IN GIS5. OBSERVATIONS6. REFERENCE
INTRODUCTION
• What is GIS?• What is QUERY?• What is Network Analysis?
QUERY
• It is one of the operation used in GIS to analyse data.• In analysis of Spatial data– Attribute query– Spatial query– Alteration of original data
ATTRIBUTE QUERY
• An attribute query is a way to search for and retrieve records of features in a set of data based on its attribute values.
• Like in a country’s map, name of states which contains “PRADESH”.
SPATIAL QUERY
• Involves selecting features based on location or spatial relationships, which require processing of spatial information• Like areas within some distance
• 3 broad categories of SPATIAL QUERY• DIRECTION• DISTANCE• TOPOLOGY
NETWORK ANALYSIS
• What is Network Analysis? Network analysis enables you to solve
problems, such as finding the most efficient travel route, generating travel directions, finding the closest facility, defining service areas based on travel time.
• Widely they are» Transportation network» Utility network
NETWORK ANALYSIS
• Rivers, Roadways, Telecommunication line, sewage, rail route etc.
• Network classification based on route,– Directed – Undirected
NETWORK ANALYSIS
UNDIRECTED NETWORK
• Transportation network is undirected network• User is free to take decision
NETWORK ANALYSIS
DIRECTED NETWORK• Utility network is directed network• It is not allowed to take different path than selected
path
MODELLING A NETWORK
• Data requirement for network analysis1. Attribute data2. Spatial data
• Network characteristics1. Length2. Direction3. Connectivity4. Pattern
MODEL OF ROAD NETWORK
Journal of Geographic Information and Decision Analysis, vol. 3
NETWORK ANALYSIS
• Types of operations in network analysis
– Shortest path analysis
– Best route
– Closest facility
– OD-cost matrix
– Network partitioning
NETWORK ANALYSIS
• Best route– Best route can be the quickest, shortest, or most scenic
route.– It depends on the Impedances chosen like Time, Distance.
• Shortest Route• The Dijkstra algorithm
APPLICATION OF NETWORK ANALYSIS
• Routing
• Travelling salesperson problem
• Resource allocation
• Isochrones
ISOCHRONES
RESOURCE ALLOCATION
TRAVELLING SALESMAN PROBLEM
APPLICATION OF QUERY
• Retrieve data
• Data manipulation
• Hydrological modeling
• Buffer maps
• Cost maps
BUFFERING
CONCLUSION
• From the study related to query and network analysis, we can
conclude that in field of urban planning there is a huge scope of
GIS-query and network analysis.
• We can able to find every detail about particular area as we
want (Spatial, Attribute).
• It reduces the work that we needed in absence of them by
manually doing so.
• By using these techniques we can avail more statistics as well as
detailed information about particulars related to GIS data.
REFERENCES
• Trodd_network analysiswww.gisknowledge.net/topic/spatial.../trodd_network_analysis_05.pdf
• Lecture notes
www.le.ac.uk/ar/arcgis/Downloads/Lecture_notes_2.pdf
• Spatial data analysis of vector and raster dataPrachi mishra sahoo
• http://egissolutions.co.uk/onewebmedia/Transportation%20%E2%80%93%20Rout
e%20Analysis.PNG • IIRS-2015 lecture notes
• Esri note on “BEGINNING ON SPATIAL DATA”