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”