GEOPOI SVG API WEB MAPPING

Transcription

1 GEOPOI SVG API WEB MAPPING Presenter: RELATORE: Fabrizio Minuti October

2 Agenda About Sogei About Geopoi Database creation Private data loading Web Server SVG Client Vector vs Raster 2

4 About Sogei 1 The Ministry of Economy and Finance (MEF), through the Department of finance, holds Sogei; Sogei develops into an integral part of the tax system with the role of partner in the ICT sector to ensure: Optimization of economic and human resources; Support in driving forward the modernization of administrative branches and integration with other public administrations. The Ministry of economy and finance becomes the sole shareholder (2008). Balance Sheet 2008 Extra MEF Relationships DDF Service Contract Agreement Operational Agreements within Automation Technical Plans 100% Shareholder MEF SOGEI Operational Contracts Tax Agencies and other Centers Pay roll: Turnover: 335 Mil Profit: 25 Mil The background of an Italian success story 4 MEF: Minister of economy and finance DDF: Department of finance

5 About Sogei 2: users and services TAXPAYERS 40.5 million individual 1.9 million companies (partnerships and joint stock companies) 5.6 million registered V.A.T. holders RETURNS AND PAYMENTS 32 million income tax returns, 3.7 million V.A.T. communications, 7 million Registry Deeds 90 million on line payments REAL ESTATE 54 million Real Estate units, 82 million land parcels 39 million Real Estate owners, 26 million landowners CUSTOMS 9 million waybills (import and export) 2.2 million declarations 60,000 lab analysis and 400,000 excise documents GAMES over 21,000 football pod betting outlets Approx. 1,900 betting concessionaires 284,000 gaming machines with money prizes linked up by network approx 250,000 registered gaming machines without money prizes ,000 Tax Preparers 30 million Citizens 600 Tax Assistance Centres ,000 Land Surveyors & Architects Bank of Italy 1,800 Tax Offices SOGEI 5 million VAT payers 1,900 betting concessionaires Other data bases ,000 Notaries 30,000 Customs operators 20 Regions ,000 Municipalities Work Insurance Institute The background of an Italian success story 5

7 About Geopoi Geopoi is a product belonging to the Location Based Services (LBS) sector and is the result of the Innovation, Research & Development department initiative driven forward by Sogei. The most groundbreaking feature of Geopoi is that it provides the opportunity to operate in the area of cartographic navigation on simplified cartographic all vector maps, developed using commercial road network data (by Navteq). Public end-users can locate their own (administrative) points/polygons of interest over the Italian territory, in order to match them with appropriate hyperlinks that trigger specific products and services. Geopoi is actually used by a large number of Italian Government organisations that can share own data to creates an Institutional Community. 7

9 Database creation 1: Data Source data: Navteq Navstreets for Oracle NOT optimized to be directly used by Geopoi! Ellipsoidal geodetic Datum of geometry data Too many tables Deep normalization of data No directly usable structures for geocoding No simplified layers for reduceddetail views 9

10 Database creation 2: Creation Geopoi s Database creations tasks 1. Geometry data is transformed in a proprietary yet documented Datum and UTM projection 2. Creation of tables and structures for fast and accurate geocoding 3. Creation of layers of simplified geometries for reduced-detail views 4. Creation of just one table containing every non-street geometry 5. Creation of just one table for static text labels 6. Creation of tables for POIs 10

11 Database creation 3: Explication Geopoi s Database - Explication 1. Geometry data is transformed in UTM projection centered in meridian 12 east Greenwich, northern hemisphere, which maximize accuracy in interest s area (Italian country) 2. Geocoding includes streets address numbers, zip codes, etc, is developed trying to reduce to zero the numbers of false-positive by using a large set of heuristics and returns also the accuracy of the geolocation. I.E. if an address is found, customer can be sure that is the right one. 3. The layers of simplified geometries are useful when the client ask for a low-scale (i.e. zoomout) view 4. Every non-street geometry, i.e. administrative boundaries, parks, building, lakes, rivers, railroads, etc, is merged in one table. Additional attributes are included to add decoration, z- order, etc. 5. Static text labels include the city names and the names generated for parks, buildings, lakes, rivers, etc. These labels will be rendered by the client together with dynamic text labels (more on this next) 6. Every POI (and its associated web links) is stored in the server: the client is never allowed to add any POI. This is a strategic decision that allows to give a guarantee that the information come from a trusted source. 11

12 Agenda About Geopoi Database creation Private data loading Web Server SVG Client Vector vs Raster 12

13 Private data loading Geopoi does NOT allow customers to add private data directly in the client via APIs. Everything have to be loaded in advance into Geopoi s database. This way Geopoi s users can be sure that informations they see are verified and approved. Loading customer s private POIs and polygon is made as simple as possible. Authenticated users can, using a simple HTML interface, view, insert, update and delete own data into Geopoi s database. A web-service is available to allow automatic updates. Massive load is possible by uploading a file that can be created in several different formats: XPOI (native Geopoi s format, XML based, very easy to manipulate), Microsoft Excel (following a given template file) or CSV. Export of data is possible in XPOI, Microsoft Excel and also in Google s KML. 13

14 Private data loading and vectorial cartographic data Vectorial cartography allows the customer to have for free additional information upon own data: 1. Linking of POIs on street nodes to improve reverse geocoding and/or route calculation 2. Associating every POI to the right administrative boundary (municipality, province, region) and calculate statistical distribution of data over the territory, visible graphically in Geopoi Vectorial cartography allows, also, to build areal polygons by selecting streets to use as boundaries, i.e. a restricted traffic zone can be created easily. 14

16 Web Server The Web Server runs Apache + PHP 5 It does as few work as possible including: User authentication Geometric query building, to fetch only necessary data, based upon user identification and client viewbox. This include (if available) the selection of the correct layer of generalization. No user is allowed to see data without the right permissions. Optimization and caching of data The software is developed using an extensible and modular architecture. Every geometric layer (i.e. streets, POIs, administrative boundaries) is mapped to a php-class that can be extended and configured easily (by specifying how to construct query, user authorizations needed, etc) 16

18 SVG Client 1: Introduction The Geopoi s SVG Client is the core of the product. It creates the map, displays the user interface and allows the user to navigate over the cartography (directly via pan and zoom, topography search, etc or via API requests) and to view POIs and Polygons of interest. 18

19 SVG Client 2: Examples Everything in the map is vectorial and is context-aware. Virtually every point displayed can carry its own information. Private layers (POIs and polygons) can have associated any number of web-links. 19

20 SVG Client 3: Static text labels Static text labels taken from Database 20

21 SVG Client 4: Dynamic text labels Dynamic text labels drawn by the SVG Client along the paths. Labels are drawn without any intersection between characters. 21

22 SVG Client 5: Dynamic text labels Dynamic text labels drawn by the SVG Client on highways 22

23 SVG Client 6: Optimization In order to reduce to minimum the waiting time of every new map request, several strategies are adopted: 1. the request is split in multiple chunks that are determined by the current map scale (zoom level) and user selection of Private POIs layers 2. geometry data received can be a full geometry (i.e. a <path> node) or a reference geometry (i.e. a <use> node) that is loaded only once per client session 3. when everything is received, the client enhances the quality of the map by adding dynamic text labels, improving streets, railroads rendering, etc 4. some geometries are pre-loaded in background at start-up (i.e. regional administrative boundaries, etc) 23

24 SVG Client 7: New map request & creation flowchart 24

25 SVG Client 8: Private Layers examples Polygonal layer of private data with custom actions and links associated Private POIs in Milan 25

26 SVG Client 9: Private Layers sample data Cadastral cartography in Rome Javascript + SVG near realtime 3D-projection experiment of cadastral data in Florence 26

27 SVG Client 10: Route and POI distribution examples Route drawn is context-aware and gives maneuvers info on mouse-over Municipality boundaries 27

28 SVG Client 11: API Examples <script type="text/javascript src=" <script type="text/javascript" > var mygeopoi= GEOPOI.create( divcontainer,{options}); mygeopoi.setcenter(lat,lon,zoom); mygeopoi.search("roma", Piazza del Colosseo, callback_function); //callback is called when done and for multiple/not founds mygeopoi.addlistener( click,my_local_function); //the function is called with appropriate data mygeopoi.pan(-3.2,2); 28

29 SVG Client 12: HTML embedded Geopoi 29

31 Vector vs Raster 1: Why Vector Vector pros: Virtually infinite zoom levels and views Everything in the map is clickable and can carry information Ease of integration of custom private polygons and POIs Real-time update of data: changes in database are immediately seen in the client (i.e. street names, one-ways, etc) Relatively little space needed for the Database Geometries can be re-projected in every known coordinate-system Vector cons: Much more processing power needed in both client and server Low efficiency of caching strategies, due to infinite views Not mobile-ready (maybe a lite version) Needs a fully SVG compliant browser or plug-in (in fact, actually only the discontinued Adobe SVG plug-in can afford the application without any problem) 31

32 Vector vs Raster 2: Why Raster Raster pros: More eye-pleasant (textures, much more pre-processing effort, etc) Faster client response even on old computers Works in every modern browser Less server resources are needed Mobile ready. Raster cons: More difficult to update cartography data Lot of disk space needed on server No coordinate-system reprojection is possible in a simple way Harder to accommodate for customer s requests 32

33 Thank You! Thank You for your attention! 33