Databases and web mapping the Open Source way

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Joanne Cook

Technology

Databases and Web Mapping the Open Source Way
Open Source GIS Masterclass, Lancaster University
January 2010

Jo Cook
OA Digital

j.cook@oadigital.net
01524 880212

$Databases + www.postgresql.org postgis.refractions.net ● Serverbased database (not like access) ● Enterpriselevel, with support for transactions and multiple users$

How to connect to a database

● HOST: localhost, 192.168.3.40, myserver.com
● DATABASE
● USERNAME
● PASSWORD
● PORT: Usually 5432

Getting spatial data into PostgreSQL

● OGR2OGR
● SHP2PGSQL
Syntax:
$shp2pgsql /location/of/file.shp tablename
s coordinate system W latin1 | psql d
database U username W h host p
port

Querying data
● SQL: Structured Query Language
SELECT some comma delimited columns
FROM your_table WHERE some
condition is met;
● Use PSQL from command line or
PgAdmin3

Spatial Querying

● Find out which county a point is in:
SELECT name_2 FROM tblcounties WHERE
st_within(geomfromtext('point(1.3 54.26)',
4326), the_geom);
● Find out which counties border
Lancashire:
SELECT a.name_2 FROM tblcounties a,
tblcounties b WHERE b.name_2='Lancashire'
AND a.the_geom && b.the_geom;

Types of Map Server

● Minnesota Map Server (aka Mapserver)
cgi program on a web server.
Configuration via text files
● Geoserver
javabased program. Configuration via
web interface

The Map File
MAP
    NAME "sample"
    STATUS ON
    SIZE 600 400
    EXTENT 180 90 180 90
    UNITS DD
    SHAPEPATH "../data"
    IMAGECOLOR 255 255 255
    WEB
        IMAGEPATH "/ms4w/tmp/ms_tmp/"
        IMAGEURL "/ms_tmp/"
    END
    LAYER
        NAME 'globalraster'
        TYPE RASTER
        STATUS DEFAULT
        DATA bluemarble.gif
    END
END

Checking the map file

● SHP2IMG
$shp2img m /location/of/mapfile.map o
/location/of/outputfile.png
● WITH THE BROWSER
http://yourserver.com/cgibin/mapserv?
map=/location/of/mapfile.map&mode=map

Connecting to PostgreSQL from Mapserver
LAYER
  NAME "province"
  STATUS ON
  TYPE POLYGON
  CONNECTIONTYPE POSTGIS
  CONNECTION "host=localhost port=5432 dbname=canada user=postgres
password=postgres"
  DATA "the_geom from province"
END

Structure of a web page

<html>

<head>
<title> My Home Page </title>
</head>

<body>
HELLO WORLD!
</body>

</html>

Scripting

● SERVERSIDE:
php, asp
● CLIENTSIDE:
javascript

$And finally...Web Mapping <html> <head> <script src="http://www.openlayers.org/api/OpenLayers.js"></script> <script type="text/javascript"> var map; function init() { map = new OpenLayers.Map('map'); mylayer = new OpenLayers.Layer.MapServer( "World Map", "http://localhost/cgibin/mapserv.exe", {map: 'C:/world_mapfile.map'}); map.addLayer(mylayer); map.zoomToMaxExtent(); } </script> </head> <body onload="init()"> <div id="map" style="width: 600px; height: 300px"></div> </body> </html>$

Base Mapping and Map Controls

● Can use base data from Google,
Microsoft, Yahoo, Openstreetmap etc,
but may need to reproject to EPSG
900913 (spherical mercator)
● Can add map controls such as layer
switchers, coordinates, reference maps
and so on

Beyond OpenLayers

•MapGuide Open Source http://mapguide.osgeo.org
•Mapfish http://mapfish.org/
•Mapchat http://mapchat.ca/
•Featureserver http://featureserver.org/

And Finally...

Open Source Web Mapping is Great Fun!!!

This work is licenced under the Creative Commons AttributionShare Alike 2.0 UK: England & Wales License.
To view a copy of this licence, visit http://creativecommons.org/licenses/bysa/2.0/uk/ or send a letter to Creative
Commons, 171 Second Street, Suite 300, San Francisco, California
94105, USA.

Jo Cook
OA Digital
http://oadigital.net
j.cook@oadigital.net
+44 (0)1524 880212

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Databases and web mapping the Open Source way

1. Databases and Web Mapping the Open Source Way Open Source GIS Masterclass, Lancaster University January 2010 Jo Cook OA Digital j.cook@oadigital.net 01524 880212

2. Introduction

3. Introduction 3 2 1

4. Databases + www.postgresql.org postgis.refractions.net ● Serverbased database (not like access) ● Enterpriselevel, with support for transactions and multiple users

5. How to connect to a database ● HOST: localhost, 192.168.3.40, myserver.com ● DATABASE ● USERNAME ● PASSWORD ● PORT: Usually 5432

6. Ways to connect

7. Getting spatial data into PostgreSQL ● OGR2OGR ● SHP2PGSQL Syntax: $shp2pgsql /location/of/file.shp tablename s coordinate system W latin1 | psql d database U username W h host p port

8. Querying data ● SQL: Structured Query Language SELECT some comma delimited columns FROM your_table WHERE some condition is met; ● Use PSQL from command line or PgAdmin3

9. Spatial Querying ● Find out which county a point is in: SELECT name_2 FROM tblcounties WHERE st_within(geomfromtext('point(1.3 54.26)', 4326), the_geom); ● Find out which counties border Lancashire: SELECT a.name_2 FROM tblcounties a, tblcounties b WHERE b.name_2='Lancashire' AND a.the_geom && b.the_geom;

10. Map Servers

11. Types of Map Server ● Minnesota Map Server (aka Mapserver) cgi program on a web server. Configuration via text files ● Geoserver javabased program. Configuration via web interface

12. The Map File MAP NAME "sample" STATUS ON SIZE 600 400 EXTENT 180 90 180 90 UNITS DD SHAPEPATH "../data" IMAGECOLOR 255 255 255 WEB IMAGEPATH "/ms4w/tmp/ms_tmp/" IMAGEURL "/ms_tmp/" END LAYER NAME 'globalraster' TYPE RASTER STATUS DEFAULT DATA bluemarble.gif END END

13. Checking the map file ● SHP2IMG $shp2img m /location/of/mapfile.map o /location/of/outputfile.png ● WITH THE BROWSER http://yourserver.com/cgibin/mapserv? map=/location/of/mapfile.map&mode=map

14. Connecting to PostgreSQL from Mapserver LAYER NAME "province" STATUS ON TYPE POLYGON CONNECTIONTYPE POSTGIS CONNECTION "host=localhost port=5432 dbname=canada user=postgres password=postgres" DATA "the_geom from province" END

15. Web Servers and Web Pages

16. Structure of a web page <html> <head> <title> My Home Page </title> </head> <body> HELLO WORLD! </body> </html>

17. Scripting ● SERVERSIDE: php, asp ● CLIENTSIDE: javascript

18. And finally...Web Mapping <html> <head> <script src="http://www.openlayers.org/api/OpenLayers.js"></script> <script type="text/javascript"> var map; function init() { map = new OpenLayers.Map('map'); mylayer = new OpenLayers.Layer.MapServer( "World Map", "http://localhost/cgibin/mapserv.exe", {map: 'C:/world_mapfile.map'}); map.addLayer(mylayer); map.zoomToMaxExtent(); } </script> </head> <body onload="init()"> <div id="map" style="width: 600px; height: 300px"></div> </body> </html>

19. Base Mapping and Map Controls ● Can use base data from Google, Microsoft, Yahoo, Openstreetmap etc, but may need to reproject to EPSG 900913 (spherical mercator) ● Can add map controls such as layer switchers, coordinates, reference maps and so on

20. Beyond OpenLayers •MapGuide Open Source http://mapguide.osgeo.org •Mapfish http://mapfish.org/ •Mapchat http://mapchat.ca/ •Featureserver http://featureserver.org/

21. And Finally... Open Source Web Mapping is Great Fun!!! This work is licenced under the Creative Commons AttributionShare Alike 2.0 UK: England & Wales License. To view a copy of this licence, visit http://creativecommons.org/licenses/bysa/2.0/uk/ or send a letter to Creative Commons, 171 Second Street, Suite 300, San Francisco, California 94105, USA. Jo Cook OA Digital http://oadigital.net j.cook@oadigital.net +44 (0)1524 880212

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