How Mapping, Cadastral and Land Registry organizations in developing countries can cost-effectively assure the quality and reliability of their Spatial Data Infrastructure (SDI)
Assuring quality and reliability of spatial services
1. 1
Assuring Quality &
Reliability
of Spatial Services in
Developing Countries
Fabio Bittencourt
22nd March 2018
WBLP Conferencewww.spatineo.com
2. ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
Communication
with Users
Trends Affecting
the Services
Meters/Indicators
Actual QoS
Delivered
Impact of
Improvements
Quality of Service QoS Conclusions
Limits/Alerts
Validate with
Standards
Volume of Data vs Reliability
Criteria for
QoS
3. VOLUME OF DATA VS
RELIABILITY
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
The volume of spatial data collected increases rapidly with
ever more powerful ways to simulate the environ and
human behavior
A good SDI allows you to find, filter, acquire and interact
with spatial data required for a particular use in a reliable,
efficient and easy-to-use manner
National Mapping, Cadaster and Land Registry are good
examples of this environ and the challenges involved in
providing a reliable platform of services
4. QUALITY OF SERVICE - QoS
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
Wikipedia:
Quality of service (QoS) is the description
or measurement of the overall performance of
a service, such as a telephony or computer
network or a cloud computing service,
particularly the performance seen by the
users of the network.
5. ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
CRITERIA FOR
QUALITY OF SERVICE
CRITERIA FOR QoS
AVAILABILITY PERFORMANCE CAPACITY
Examples with information to illustrate
quality criteria extracted from geospatial
services provided by:
• CONDER Bahia (Brazil)
• Neuquén Region (Argentina)
6. ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
CRITERIA FOR QoS - AVAILABILITY
The most used service in CONDER
7. CRITERIA FOR QoS -
PERFORMANCE
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
8. CRITERIA FOR QoS -
CAPACITY
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
9. CRITERIA FOR QoS -
CAPACITY
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
10. Actual QoS DELIVERED
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
Monitoring the monthly variation on service interruption records and the respective blocked requests
due to these interruptions, helps defining what is the actual level of service (not) delivered to users
13. TRENDS AFFECTING
THE SERVICES
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
Combining the information of the most popular services with those with biggest changes in speed in
the same period, let us do correlations that help making more effective decisions by identifying the
most likely origin of the performance issues
16. METERS/INDICATORS
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
The limit values of error % and response time for a service are shown through an indicator. The
indicators take the information produced by a meter and and aufere the value of the current status of
QoS for a service, based on the results of the monitoring produced by the meter
17. LIMITS/ALERTS
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
When an indicator change the status of the
QoS from Ok to “Warning” or “Error”, it
creates an alert and records the alert in the
monitoring database
18. IMPACT OF IMPROVEMENTS
ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
A key measurement is the impact of the
amount of time saved or spent by users.
Graph shows the variation in an specific
month against the average over the previous
6 months (it’s based on the response time
multiplied by the number of monthly
requests).
How much less (or more) time the users
are spending to access the same
information?
What’s the financial impact in the society?
19. ASSURING QUALITY & RELIABILITY OF SPATIAL SERVICES
CONCLUSIONS
Without a high level of availability of services, the effort made to build
an SDI has low value
Data driven impact assessment to track the progress reveals how
successful the implementation is
Assure availability, performance and capacity levels, while optimizing
investments in the infrastructure
Intelligence analysis with good visualization of indicators aligned with
the strategy is key to succeed
By proving the value of spatial services you are promoting
development
A lot is said about the quality of the spatial data, but not much is discussed regarding the quality of the services delivered. Here, we show how Spatial Data Platforms can assure the quality of their services.
CONDER – Urban Development Company of Bahia State
Neuquén departments: Cadaster, Hydrocarbon, Mining & Energy, Transportation, Tourism, etc..
The only way to assure a certain level of performance is by following closely the realistic response time of the service.
YOU CAN DETERMINE THE CAPACITY OF THE SERVICES USING THE SAME MONITORING AGENT TECHNOLOGY USED FOR A DIFFERENT PURPOSE: A LOAD TEST
It’s a consistent way of determining the real capacity of the service BEFORE publishing
Once stablished the criteria for QoS, the availability information can be used and shared. Anouncements of maintenance and interruptions can be exhibited.
What’s the level of availability defined for a service or group of services?
Mention the Water Map case.
Validation of metadata of the services for technical especifications of OGC: WMS 1.3 e WMTS 1.0.0. Metadata in the Capabilities document are checked against the Technical Implementation Guidelines.
The more available a service needs to be, the more restricted these limits to alerts should be.
Further calculations can be made and we have done that, for measuring the financial impact of it
