QUERY AND NETWORK ANALYSIS IN GIS

1. GEOSPATIAL TECHNIQUES
(CE-645)
QUERYAND NETWORK ANALYSIS
Civil Engineering Department, M.Tech (Urban Planning), Semester-1
GUIDED BY:- SHRI. RAVIN TAILOR
PREPARED BY:- DEVANG D KAPADIA
ROLL NO. :- P15UP009

2. CONTENTS
1. INTRODUCTION
2. QUERY
3. NETWORK ANALYSIS
4. USE IN GIS
5. OBSERVATIONS
6. REFERENCE

3. INTRODUCTION
• What is GIS?
• What is QUERY?
• What is Network Analysis?

4. 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

5. 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”.

6. 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

7. 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

8. NETWORK ANALYSIS
• Rivers, Roadways, Telecommunication line, sewage,
rail route etc.
• Network classification based on route,
– Directed
– Undirected

9. NETWORK ANALYSIS
UNDIRECTED NETWORK
• Transportation network is undirected network
• User is free to take decision

10. NETWORK ANALYSIS
DIRECTED NETWORK
• Utility network is directed network
• It is not allowed to take different path than selected
path

11. MODELLING A NETWORK
• Data requirement for network analysis
1. Attribute data
2. Spatial data
• Network characteristics
1. Length
2. Direction
3. Connectivity
4. Pattern

12. MODEL OF ROAD NETWORK
Journal of Geographic Information and Decision Analysis, vol. 3

13. NETWORK ANALYSIS
• Types of operations in network analysis
– Shortest path analysis
– Best route
– Closest facility
– OD-cost matrix
– Network partitioning

14. 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

15. APPLICATION OF NETWORK ANALYSIS
• Routing
• Travelling salesperson problem
• Resource allocation
• Isochrones

16. ISOCHRONES

17. RESOURCE ALLOCATION

18. TRAVELLING SALESMAN PROBLEM

19. APPLICATION OF QUERY
• Retrieve data
• Data manipulation
• Hydrological modeling
• Buffer maps
• Cost maps

20. BUFFERING

21. 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.

22. REFERENCES
• Trodd_network analysis
www.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 data
Prachi 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”