1 Laboratory on Geoinformatics and Cartography 4. VIEW PROCESSES, PREVIEW OF DISCOVERED SPATIAL DATA 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 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 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 Watermark Degradation of the image quality Even required registration 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 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 2 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 • http://inspire.ec.europa.eu/index.cfm/pageid/5 Legislation background Laboratory on Geoinformatics and Cartography • Type in http://inspiregeoportal.ec.europa.eu/discovery/ or http://geoportal.gov.cz/web/guest/map/ Let’s make it simple…a use case with Web browser Laboratory on Geoinformatics and Cartography • Sure, all this is again originating from INSPIRE legislation Legislation background 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 Discovery 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? 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 Laboratory on Geoinformatics and Cartography Get Map • Type http://heis.vuv.cz/data/webmap/isapi.dll?SERVICE=WMS&LANG=CS- CZ&LAYERS=wms_chopav&TRANSPARENT=TRUE&FORMAT=image%2Fpng&EXCEPTION S=XML&VERSION=1.3.0&STYLES=inspire_common%3ADEFAULT&CRS=EPSG%3A102067 &OWSSERVICE=WMS&FROMCRS=EPSG%3A102067&REQUEST=GetMap&BBOX=- 920000,-1200000,-319000,-960000&WIDTH=1200&HEIGHT=500 into a Web browser 3 Laboratory on Geoinformatics and Cartography Thick client – a GIS platform Laboratory on Geoinformatics and Cartography server client Chaining of catalogues (through Link View Service Operation) server server server Adopted from: http://www.dbstephens.com 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 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