THINK OPEN, THINK FUTURE

Transcription

1 THINK OPEN, THINK FUTURE How to open polygons and doors using Python Marco

2 Marco Bernasocchi MSc in UNIZH Developer, Consultant, Teacher & foremost Geek Skier, Climber, Diver marco@opengis.ch

3 This Talk Open What?? Open Source! Does that do polygons also? I want it! I want it NOW Python, really!? Discussion & questions Download from

4 Closed Source

5 Closed Source

6 Free/Libre Open Source Software Free to: Use, Learn, Change, Share free software is a matter of liberty, not price. To understand the concept, you should think of free as in free speech, not as in free beer.

7 You say who does that? Let me show you...

8 UBUNTU LINUX

9 GIMP

10 INKSCAPE

11 LIBRE OFFICE

12 FIREFOX

13 VLC

14 RHYTHMBOX

15 PYCHARM

16 APACHE/WORDPRESS

17 QGIS/InaSAFE

18 Impossible Business Model!? NOPE!

19 What about my polygons? They will be in the best hands with thanks to: Open Source Geospatial Foundation (OSGeo.org) Many passionated contributors Companies that do OS dev

20 OSGeo.org Is the reference organization (Live DVD/USB stick) whit many GIS related open source software Guarantees Quality and Long term Commitment Official and In Incubation Projects

21 (F)OSS GIS users NASA, ESA United Nations IGN (France), BKG (Germany) US Postal Service European Weather Forecast Centre (ECMWF) OpenStreetMap and Wikipedia Google, Microsoft and Apple GIS software vendors: ESRI, Autodesk Telcos: NTT (Japan)

22 Why FOSSGIS? Flexibility Speed of Development Ability to influence a project Cost sharing Scalability: No per-seat licensing costs Reuse instead of re-inventing the wheel More interesting and rewarding jobs

23 New Aspects with FOSSGIS Project versus product Different support channels Power users should invest financially in their key projects they use Quality assurance issues (testing) FOSS-GIS users have more responsibilities than consumers of a commercial product

24 OSGEO.ORG official projects Databases: Postgis, SpatiaLite, Rasdaman, etc. Geospatial Libraries: GDAL, OGR, PROJ4, GEOS, FDO, etc. Web Mapping Server: UMN Mapserver, Geoserver, MapGuide, QGIS Server, deegree Web Mapping Clients: OpenLayers, MapGuide, GeoExt, MapFish, MapBender, QGIS Webclient

25 OSGEO.ORG official projects Desktop GIS: GRASS GIS, Quantum GIS, gvsig Geospatial Toolboxes und ETL-Tools: SEXTANTE, OTB, Geokettle, SAGA Metadata Catalog: GeoNetwork Other Projects: Public Geospatial Data (OpenStreetmap, NaturalEarth), Education and Curriculum

26 Relationship-Diagram Foss4G

27 Real Example: QGIS Quantum GIS (QGIS) is a user friendly Open Source GIS. QGIS is an official project of the Open Source Geospatial Foundation (OSGeo). It runs on Linux, Unix, Mac OSX, Windows and Android and supports numerous vector, raster, and database formats and functionalities. QGIS Desktop QGIS Server QGIS Web Client QGIS on Android

28 Real Example: Msc Thesis

29 Real Example: GsoC ECTS 6000$ Eternal Glory ;)

30 Real Example: GIS in Uster Mixed Environment (FOSSGIS, commercial) Many different applications and databases (Postgis, Oracle, MySQL, SQL-Server) Usage of FME and OGR for data-transfer New Desktop-GIS and Webgis implemented with QGIS

31 FOSSGIS in Uster

32 QGIS in Uster QGIS-Server and Webclient for all webgis topics Wastewater and GEP topics Underground cadastre (Leitungskataster) Greenspace cadastre Nature and environment topics Denkmalschutzkataster Pupil assignments (Schülerzuteilung) Accident statistics (Unfallstatistik)

33 QGIS wastewater management

34 QGIS wastewater viewer

35 QA Database synchronisation

36 Simplified City Model with Buildings

37 Live Population Statistics

38 Live Population Statistics

39 Live Population Statistics Google Earth

40 Common Challenges Combination and integration with existing databases and applications Quality assurance of basic data Data exchange with National and regional gov GIS project management Missing cooperation and lack of comprehension for the big picture

41 I want it NOW! Get INVOLVED: TRY existing projects CONTRIBUTE to existing projects CREATE a new project SHARE your existing project

42 TRY Google open source whatever you need osalt.com - Find Open Source Alternatives to commercial software Github.com find source of thousends of projects ohloh.net statistics about OS projects

43 Contribute Testing/Bug reports Writing/Documentation Support Tutorials Start a group Share Remix Graphics/Design Programming

44 Who to ask? MAINTAINERS who manage the project you're interested in WEBSITES for the project may have a "get involved" section PROFESSORS may let you make your projects open source and guide you in getting involved EMPLOYERS because Open Source team experience IS 21st century employment

45 What about my bills? Summer-of-Codes (Google SOC, Ruby SOC, etc.) Internships at OS-friendly companies (Red Hat, Mozilla, Untangle, Canonical, etc.) Kickstarter Join (or start!) a company that uses open source

46 Ok, how do I make my project Open Source? Attach a license Share the code with others Use some social media for marketing

47 License, WTF!?!? Lots of licenses to choose from... to protect your work GPL Is now, and will forever be free BSD Is free, but new versions don't have to be free too Apache Similar to BSD Lots and lots more: IBM, Intel, MIT, Mozilla, Python, Microsoft Sun,...

48 And for the Data? Does wikipedia.org sound familiar? Creative Commons!

49 Ahh! now I get the opening doors in the title Open Source Opportunity Open Source Employment Open Source Involvement Open Source Social responsibility

50 Good, good, and now lets Snake Snake, not snack... Lets introduce a member of a family of nonvenomous snakes (some of which are some of the largest snakes in the world) found in Africa, Asia and Australia.

51 Behold the mighty Python

52 Or the geek friendly version of it...

53 What is Python? (adapted from Guido van Rossum, BDFL) O-O rapid prototyping language Not just a scripting language Not just another Perl Easy to learn, read, use Extensible (add new modules) C/C++/Fortran/whatever Java (through Jython) Embeddable in applications

54 Touchy-feely properties Open Source (OSI Certified) Mature (23 years old) Supportive user community copyrighted but use not restricted no "viral" license owned by independent non-profit, PSF plenty of good books, too Simple design, easy to learn reads like pseudo-code Suitable as first language Suitable as last language :-)

55 High-level properties Extremely portable Compiles to interpreted byte code Unix/Linux, Windows, Mac, PalmOS, WindowsCE, RiscOS, VxWorks, QNX, OS/2, OS/390, AS/400, PlayStation, Sharp Zaurus, BeOS, VMS compilation is implicit and automatic Memory management automatic reference counting for most situations GC added for cycle detection Safe : no core dumps due to your bugs

56 What is it used for? rapid prototyping web programming (client and server side) ad hoc programming ("scripting") steering scientific applications extension language XML processing database applications GUI applications education

57 Who is using it? Google (various projects) NASA (several projects) NYSE (one of only three languages "on the floor") Industrial Light & Magic (everything) Yahoo! (Yahoo mail & groups) RealNetworks (function and load testing) RedHat (Linux installation tools) LLNL, Fermilab (steering scientific applications) Zope Corporation (content management) ObjectDomain (embedded Jython in UML tool) Alice project at CMU (accessible 3D graphics) More success stories at

58 Language properties Everything is an object Packages, modules, classes, functions Exception handling Dynamic typing, polymorphism Static scoping Operator overloading Indentation for block structure Otherwise conventional syntax

59 High-level data types Numbers: int, long, float, complex Strings, Unicode: immutable Lists and dictionaries: containers Other types for e.g. binary data, regular expressions, introspection Extension modules can define new built-in data types

60 Interfaces to... XML DOM, expat XMLRPC, SOAP, Web Services Relational databases MySQL, PostgreSQL, Oracle, ODBC, Sybase, Informix Java (via Jython) Objective C COM, DCOM (.NET too) Many GUI libraries cross-platform platform-specific Tk, wxwindows, GTK, Qt MFC, Mac (classic, Cocoa), X11

61 Compared to Java Code up to 5 times shorter and more readable Dynamic typing Multiple inheritance, operator overloading Quicker development no compilation phase less typing Yes, it may run a bit slower but development is much faster and Python uses less memory (studies show) Similar (but more so) for C/C++

62 Example function def gcd(a, b): "greatest common divisor" while a!= 0: a, b = b%a, a return b # parallel assignment

63 Example class class Stack: "A well-known data structure" def init (self): # doc string # constructor self.items = [] def push(self, x): self.items.append(x) # the sky is the limit def pop(self): x = self.items[-1] # what happens if it s empty? del self.items[-1] return x def empty(self): return len(self.items) == 0

64 References and plugs Links: ex.html

65 Questions & Discussion Thank you for the attention

66 And action... Open terminal and type python or better ipython