MODIFICATIONS TO WEB PROCESSING SERVICE STANDARD FOR CLIENT-SIDE GEOPROCESSING Evgeny Panidi, Eduard Kazakov, Anton Terekhov, Evgeny Kapralov panidi@yandex.ru.

MODIFICATIONS TO WEB PROCESSING SERVICE STANDARD

FOR CLIENT-SIDE GEOPROCESSING

Evgeny Panidi, Eduard Kazakov, Anton Terekhov, Evgeny Kapralov

panidi@yandex.ru

Saint-Petersburg State UniversityInstitute of Earth Sciences

Department of Cartography and Geoinformatics

The study was partially supported by Russian Foundation for Basic Research (RFBR), research project No. 13-05-12079 ofi_m.

Problem• All of the current geospatial standards for Web are the

server-oriented standards.

• Web Processing Service gives the data, not the tool.

• Implementation of the IoT and Fog Computing concepts into WebGIS is at the early beginning stage.

• Client-side resources are not in use.

2Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Idea• User’s point of view:

• Large data amounts on the client side;• Unstable communication channels;• Data transfer restrictions;• Growing computational facilities.

• SDI’s point of view:• Distributed data!• Distributed services and tools?

3Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Idea• User’s point of view:

• Large data amounts on the client side;• Unstable communication channels;• Data transfer restrictions;• Growing computational facilities.

• SDI’s point of view:• Distributed data!• Distributed services and tools?

• The obvious way is to transmit the tool instead of the data.

4Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Objectives

• Open source approach implementation;

• Server-side and client-side processing using single code;

• Backward compatibility with OGC WPS standard;

• Abstract specification – different implementations.

5Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Solution

6

getProcess method for the executable code transmitting to the client computer (in case of WPS 1.0.0):

Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Our Implementation• Python

• PSFL license;

• Interpreted language executable in different environments and on different software platforms;

• Libraries for geospatial data processing;

• De facto standard language for GIS add-ons.

• Python code + PyWPS + HGWS Server + Client-Side RE = Hybrid Geoprocessing Web Service

7Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

General Schema• Server-side processing is WPS-

like.

• Client-side processing: getting list of executable files with getProces request.

• Executable code:• fModules are the containers for

processing algorithms (script files, DLLs, bytecode files etc.) – the client-side Runtime Environment is needed;

• ExtraApps are active software components that can be executed directly or through RE.

8Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

HGWS Architecture

9Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Chain of Requests• Step by step receiving of

processes list, selected process metadata and selected process components.

• getProcess GET example:http://some.host/server?

Request=getProcess&

Service=HGWS&

Version=x.0.0&

Platform=Win32&

Identifier=Process_name 10Modifications to Web Processing Service Standard for Client-Side Geoprocessing

Free and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Current Results

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Geoportal prototype for HGWSs publication and access Client-side RE application

http://195.70.211.131

Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

Future Work

• Unification and standardization.

• Atomization and orchestration.

• Security problems.

• Discussion on findings.

12Modifications to Web Processing Service Standard for Client-Side GeoprocessingFree and Open Source Software for Geospatial Conference (FOSS4G 2015), 14–19 September 2015, Seoul, South Korea © Evgeny Panidi (panidi@yandex.ru)

THANK YOU!

panidi@yandex.ru