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Laboratory on Geoinformatics and Cartography
4. VIEW PROCESSES, PREVIEW OF DISCOVERED SPATIAL DATA

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Laboratory on Geoinformatics and Cartography
•“View services making it possible, as a minimum, to display, navigate, zoom in/out, pan, or
overlay viewable spatial data sets and to display legend information and any relevant content of
metadata.”(Article 11 of the INSPIRE directive)
•Sounds that familiar to you?
–Sure, same functionality as Google Maps, Mapy.cz,…
The concept of preview in ESDI

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Laboratory on Geoinformatics and Cartography
•“Experience in the Member States has shown that it is important, for the successful implementation
of an infrastructure for spatial information, that a minimum number of services be made available
to the public free of charge. Member States should therefore make available, as a minimum and free
of charge, the services for discovering and, subject to certain specific conditions, viewing
spatial data sets.” (Paragraph 19)
–
The concept of preview in ESDI

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Laboratory on Geoinformatics and Cartography
•“Data made available through the view services may be in a form preventing their re-use for
commercial purposes.” (Article 14)
The concept of preview in ESDI
qWatermark
q
qDegradation of the image quality
qEven required registration

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Laboratory on Geoinformatics and Cartography
•Equals to ISO 19128
–ISO 19128 equals to OGC Web Map Service 1.3.0
•Only version 1.3.0!
INSPIRE View service

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Laboratory on Geoinformatics and Cartography
1.Through a “thin” client
–typically a Web browser…really like Google Maps
–
–
–
–
2.Through a “thick” client
–e.g. a map client, typically GIS
•
Two possibilities of connecting to a view service

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Laboratory on Geoinformatics and Cartography
•Again, all this is originating from INSPIRE legislation (the same as for discovery services)
•
•
•
•
•
•COMMISSION REGULATION (EC) No 976/2009 of 19 October 2009 implementing Directive 2007/2/EC of the
European Parliament and of the Council as regards the Network Services
•https://eur-lex.europa.eu/legal-content/EN/ALL/?uri=CELEX%3A32009R0976
•
Legislation background

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Laboratory on Geoinformatics and Cartography
•Type in http://inspire-geoportal.ec.europa.eu/discovery/ or
http://geoportal.gov.cz/web/guest/map/
•
Let’s make it simple…a use case with Web browser

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Laboratory on Geoinformatics and Cartography
•Sure, all this is again originating from INSPIRE legislation
•
Legislation background

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Laboratory on Geoinformatics and Cartography
•Get View Service Metadata
–i.e. GetCapabilities according to the OGC
•Get Map
–i.e. GetMap according to the OGC
•Link View service
–an equivalent of service chaining according to the OGC
•
•Note: OGC GetFeatureInfo is not intended under the INSPIRE standardization framework
Operations of an INSPIRE view service
Aren’t you missing anything?

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Laboratory on Geoinformatics and Cartography
•Intended for “thick” clients
•Not applicable for an ordinary user with a Web browser
Get View Service Metadata
catalogue
client
http://heis.vuv.cz/data/webmap/isapi.dll?SERVICE=WMS&REQUEST=GetCapabilities
Title
Hydroecological information system – map server OpenGIS WMS
Service type
INSPIRE View Service (WMS – Web Map Service according to the OGC)
Service version
1.3.0
Supported languages
Czech, English
Fees
Free of charge
Responsible Party
VÚV TGM, v.v.i.
E-mail
info@cenia.cz
Supported operations
Get View Service Metadata
Get Map
Link View service
GetFeatureInfo

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Laboratory on Geoinformatics and Cartography
Get Map
•Type
https://geoportal.mzcr.cz/server/services/VerejneAplikace/KoupaciVody/MapServer/WmsServer?LAYERS=0&
TRANSPARENT=TRUE&FORMAT=image%2Fpng&EXCEPTIONS=XML&VERSION=1.3.0&INFO_FORMAT=application%2Fvnd.esri
.wms_featureinfo_xml&STYLES=default&CRS=EPSG%3A102067&OWSSERVICE=WMS&FROMCRS=EPSG%3A102067&SERVICE=
WMS&REQUEST=GetMap&BBOX=-1032528.9369344,-1412694.1139342,-117471.06306564,-768005.88606581&WIDTH=1
787&HEIGHT=1259 into a Web browser

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Laboratory on Geoinformatics and Cartography
Thick client – a GIS platform

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Laboratory on Geoinformatics and Cartography
http://www.dbstephens.com/uploads/images/GIS_NM_stackup.png
server
client
Chaining of catalogues (through Link View Service Operation)
server
server
server
Adopted from: http://www.dbstephens.com

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Laboratory on Geoinformatics and Cartography
•Again defined in legislation
•For a 470 Kilobytes image (e.g. 800 × 600 pixels with a colour depth of 8 bits), the response time
for sending the initial response to a Get Map Request to a view service shall be maximum 5 seconds
in normal situation. Normal situation represents periods out of peak load. It is set at 90 % of the
time. •The minimum number of served simultaneous requests to a view service according to the
performance quality of service shall be 20 per second. •The probability of a Network Service to be
available shall be 99 % of the time.
Quality of service

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Laboratory on Geoinformatics and Cartography
Quality of service…still the same
Uptime [%]
Maximum downtime
Per week
Per month
Per year
95
8.4 hours
36.00 hours
18.25 days
98
3.4 hours
14.40 hours
7.30 days
99
1.7 hours
7.27 hours
3.63 days
99.9
10 minutes
0.73 hours
8.76 hours