Getting The Best Performance For GeoJSON Map Visualizations: PostGIS Vs CouchDB Backend
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Getting The Best Performance For GeoJSON Map Visualizations: PostGIS Vs CouchDB Backend
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Title 
Getting The Best Performance For GeoJSON Map Visualizations: PostGIS Vs CouchDB Backend

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License 
CC Attribution  ShareAlike 3.0 Unported:
You are free to use, adapt and copy, distribute and transmit the work or content in adapted or unchanged form for any legal and noncommercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor and the work or content is shared also in adapted form only under the conditions of this license. 
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Release Date 
2013

Language 
English

Production Place 
Nottingham

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Subject Area  
Abstract 
In order to deliver rich user experience to user, features (attribute data and geometries) have to be sent to the client for mouseover visual effects, synchronization between charts, tables and maps, and onthefly classifications. GeoJSON is one of the most popular encodings for the transfer of features for clientside map visualization. The performance of client visualizations depends on a number of factors: message size, client memory allocation, bandwidth, and the speed of the database backend amongst the main ones. Large GeoJSONencoded datasets can substantially slow down loading and stylization times, and also crash the browser when too many geometries are requested. A combination of techniques can be used to reduce the size of the data (polygon generalization, compression, etc). The choice of an opensource DBMS for geospatial applications used to be easy: PostGIS is powerful, wellsupported, robust and fast RDBMS ? On the other hand, unstructured data, such as (Geo)JSON, may be better served by documentoriented DBMS such as Apache CouchDB. The performance of PostGIS and CouchDB in producing GeoJSON polygons with different combination of factors that are known to affect performance was tested: compression of GeoJSON (zip) to reduce transmission times, different levels of geometry generalization (reducing the number of vertices in transferred geometries), precision reduction (the reduction of numbers of decimal digits encoding coordinates), and the use of a topological JSON encoding of geometries (TopoJSON) to avoid redundancy of edges transferred. We present the results of a benchmark exercise testing the performance of an OpenLayers interface backed by a persistence layer implemented using PostGIS and CouchD. Test data were collected using an automated test application based on Selenium, which allowed to gather repeated observations for every combination of factors and build statistical models of performance. These statistical models help to pick the best combination of techniques and DBMS, and to gauge the relative contribution of every technique to the overall performance.

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Melting
Personal identification number
Mapping
Video game
Computer animation
Presentation of a group
Blog
Multiplication sign
Web browser
00:26
Web page
Metropolitan area network
Building
Personal identification number
Mapping
Projective plane
Core dump
Web browser
Mereology
Local Group
Power (physics)
Local Group
Sign (mathematics)
Process (computing)
Computer animation
Quicksort
Physical system
Reverse engineering
Physical system
02:00
Torus
Point (geometry)
Area
Polygon
Set (mathematics)
Server (computing)
Visual system
File format
Client (computing)
Division (mathematics)
Table (information)
Sound effect
Partition (number theory)
CAN bus
Mathematics
Computer animation
Vector space
Statement (computer science)
Statistics
Electronic visual display
03:34
Point (geometry)
Topological vector space
Complex (psychology)
Context awareness
Divisor
State of matter
Line (geometry)
Graph (mathematics)
Decision theory
Covering space
File format
Mass
Average
Number
Wave packet
Factor analysis
Data compression
Band matrix
Dependent and independent variables
Process (computing)
Divisor
Communications protocol
Logic gate
Sanitary sewer
Service (economics)
Overhead (computing)
Graph (mathematics)
Server (computing)
Computer file
Complex (psychology)
Client (computing)
Bit
Web browser
Graph (mathematics)
Process (computing)
Computer animation
Factory (trading post)
Dependent and independent variables
Encryption
Game theory
Film editing
06:52
Point (geometry)
Polygon
Boss Corporation
Graph (mathematics)
Spacetime
Key (cryptography)
Algorithm
Graph (mathematics)
Point (geometry)
Ripping
Shape (magazine)
Thresholding (image processing)
Functional (mathematics)
Thresholding (image processing)
Distance
Preprocessor
Subject indexing
Digital photography
Computer animation
Network topology
Dependent and independent variables
Arc (geometry)
Reading (process)
09:17
Statistical hypothesis testing
Group action
Divisor
Structural load
Demo (music)
Überlastkontrolle
Mathematical analysis
Graph (mathematics)
Sound effect
Voting
Degree (graph theory)
Sic
Roundness (object)
Testdaten
Data compression
Database
Energy level
Divisor
Metre
Theory of relativity
Hoax
Structural load
Length
Uniform convergence
Weight
Group action
Statistical hypothesis testing
Graph (mathematics)
Statistical hypothesis testing
Maxima and minima
Singleprecision floatingpoint format
Computer animation
Personal area network
Energy level
Separation axiom
11:06
Point (geometry)
Email
State observer
Set (mathematics)
Multiplication sign
Cloud computing
Firstorder logic
Graph (mathematics)
Area
Statistical hypothesis testing
Number
Factor analysis
Personal digital assistant
Dependent and independent variables
Website
Subtraction
Statistical dispersion
Decision theory
Real number
Point (geometry)
Client (computing)
Mereology
Control flow
Statistical hypothesis testing
Web browser
Statistical hypothesis testing
Band matrix
Number
Computer animation
Network topology
Noise
Condition number
Decimal
Game theory
Units of measurement
Window
Resultant
12:42
Polygon mesh
Distribution (mathematics)
Multiplication sign
Scientific modelling
Physical law
File format
Mereology
Variable (mathematics)
Number
Factor analysis
Frequency
Population density
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Sample (statistics)
Computer animation
Network topology
Database
Queue (abstract data type)
Cycle (graph theory)
Subtraction
14:18
Polygon
Query language
Set (mathematics)
Multiplication sign
3 (number)
Bit error rate
19 (number)
Summation
Subject indexing
Divisor
World Wide Web Consortium
Geometry
View (database)
Server (computing)
Bit
Mereology
Functional (mathematics)
Singleprecision floatingpoint format
Number
Computer animation
Database
Personal digital assistant
Function (mathematics)
Cuboid
Physical system
15:30
Point (geometry)
Polygon
Freeware
Linear regression
Graph (mathematics)
Decision theory
Scientific modelling
File format
Statistical hypothesis testing
Number
Data model
Factor analysis
Dependent and independent variables
Bus (computing)
Divisor
Logic gate
Zoom lens
Inheritance (objectoriented programming)
Geometry
Server (computing)
Point (geometry)
Theory
Set (mathematics)
Quantile
Graph (mathematics)
Dean number
Number
Computer animation
Database
Energy level
Figurate number
Procedural programming
Resultant
17:29
Geometry
Divisor
Graph (mathematics)
Line (geometry)
Scientific modelling
View (database)
Geometry
Mathematical analysis
Graph (mathematics)
Table (information)
Number
Sound effect
Data model
Factor analysis
Network topology
Dependent and independent variables
Zoom lens
Graph (mathematics)
Geometry
Sound effect
Usability
Prediction
Graph (mathematics)
Computer animation
Pi
Personal digital assistant
Energy level
19:06
Boss Corporation
Multitier architecture
Random number
Graph (mathematics)
Geometry
Set (mathematics)
Video game
Route of administration
Area
Variable (mathematics)
Graph (mathematics)
Data model
Number
Type theory
Computer animation
Thermal fluctuations
Data compression
Computer network
Data compression
Compilation album
Noise
Communications protocol
Bounded variation
Communications protocol
19:37
Point (geometry)
Geometry
Divisor
Numerical digit
State of matter
Graph (mathematics)
Dot product
Multiplication sign
Average
Formal language
Number
2 (number)
Statistical hypothesis testing
Sound effect
Data model
Prediction
Data compression
Average
Dependent and independent variables
Multiplication sign
Graph (mathematics)
Geometry
Point (geometry)
Projective plane
Prediction
Process (computing)
Computer animation
Network topology
Integrated development environment
Computer network
Data compression
Quicksort
Procedural programming
Reading (process)
22:33
Numerical digit
Logistic distribution
Graph (mathematics)
View (database)
File format
Online help
Mathematical analysis
Average
Total S.A.
Data model
Factor analysis
Dependent and independent variables
Authorization
output
Communications protocol
Physical system
Prolog
Graph (mathematics)
Statistical dispersion
Geometry
Point (geometry)
Physical law
Prediction
Greatest element
Statistical hypothesis testing
Graph (mathematics)
Number
Computer animation
Network topology
Database
Data compression
Pressure
00:01
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