PowerPoint-Prsentation

Mapping, GIS and Geolocating data in Java

Using open source software

Joachim Van der Auwera / Geosparc nv

AGENDA

GIS basics

Data and data formats

Database options

Java libraries

Java servers and frameworks

GIS basics

Maps, layers, tiles and features

Geometries

Spatial operations and queries

Projections and Coordinate Reference Systems

Location?

Layers

Handling complexity

Data is split

Overlays

Transparency

Tiles

Handling size

Data is split

Stitched together at joins

Fixed size

WMTS

Eases cacheability

Features

Represents a real-world phenomenon

Has geometry, linking to location on earth

Has attributes, e.g. maximum depth for a lake

Geometry

Point, multi-

Linestring, multi-

Linear ring, multi-

Polygon, multi-

Usually only one type per layer

Constraints on allowed shapes

Spatial queries

Distance, buffers, joins, intersections

CQL, ECQL

Coordinate Reference Systems

Coordinate notation

Spherical or ellipsoid approximationWhich ellipsoid

Origin: (Meridian, Greenwich)?

Unit: degrees, meters,...

Influence of time

WGS84 : global, used by GPS(lat,lon) or (lon,lat)

Many local variants

Projections

The world is not flat

But a screen/paper is

Approximate using a sphere

Approximate using an ellipsoid

Some optionsCylindrical

Start from a point (azimuthal)

Conical

Projections, always a compromise

Conformal

Equal-area

Equidistant

e.gMercator

Winkel Tripel

Lambert cyl

Equirectangular

Sinusoidal

Molleweide

Waterman to the rescue?

Coordinate Reference Systems

EPSG database

http://www.epsg-registry.org/

EPSG:4326 is WGS84

EPSG:3857 is Mercator

Google Mercator (originally 900913, then 3785, now gone?)

DuplicatesEPSG:4326 (lat-lon or lon-lat)

urn:x-ogc:def:crs:EPSG:6.11.2:4326

WG:84

CRS, SRS, SRID

Coordinate Reference System (CRS)often expressed as Well Known Text (WKT)

SRS, Spatial Reference CodeEPSG:54019

SRID, Spatial Reference ID54019

Depends on authority!

Usually EPSG

Projecting raster images?

Aereal images need corrections

Image affected byHeight of camera

Projection + location (e.g. Mercator!)

Angle of photo + height of surface

Precision

Precision allows aligning coordinates on a gridCan skew results on spatial operations

CRS transformations

Transformations can be inaccurate as lines turn into curves

Location

Where am I?

In browser, HTML5, based on IP, GPS, GSM signal

Where is ?Mostly through geocoder web-servicesGeonames (http://www.geonames.org/)

Nominatim (http://nominatim.openstreetmap.org/)

Google API, Mappy, Yahoo! PlaceFinder

Data and data formats

OGC Standards: WMS, WFS, WMST

Raster formats: GeoTiff, JPEG2000, ...

Vector formats: GeoJSON, KML, shape, ...

Free data: OpenStreetMap, Natural Earth, local data

Open Geospatial Consortium

Home to most of the GIS related standards

http://www.opengeospatial.org/

WMS, Web Map Service

WFS, Web Feature Service

WMTS, Web Map Tile Service

WKT, Well Known Text

GML, Geographic Markup Language

KML, Keyhole Markup Language (Google)

SLD, Styled Layer Description

WPS, Web Processing Service

WCS, Web Coverage Service

...

Other raster formats

GeoTIFF

JPEG2000

MrSID

Erdas Imagine

SDTS

ECW

DTED

NITF

NASA ELAS

GRASS rasters

ESRI grid

NetCDF

...

Other vector formats

Shape file (ESRI), very common

GeoJSON

TIGER

DXF (AutoCad)

SDF (Autodesk, MapGuide)

Open / free data

OpenStreetMap, community built map

http://www.openstreetmap.org/

Natural Earth

http://www.naturalearthdata.com/

Local data

Database options

Why a spatial database?Spatial operations

OGC Simple Features for SQL support

WHERE ST_Intersection(roads.geom, city.geom)

Spatial indexes

RelationalPostGis

GeoDB / H2

NoSQLNeo4j

GeoCouch / CouchDB

PostGIS

Spatial PostgreSQL

PostgreSQL 8.3+

(non-Java)

High Performance

Data Integrity

Complete supportAll spatial operations

Coordinate transformations

n-dimensional

projectPostGis

version1.5.3

sitehttp://postgis.refractions.net/

licenseGPL (JDBC driver is BSD)

GeoDB

Spatial H2

In-memory DBideal for junit testing

Does not support all methods, but can easily be extended

projectGeoDB

version0.4

sitehttps://github.com/jdeolive/geodb/wiki

licenseBSD-like

Neo4j

NoSQL, graph database

geographic features stored as graphs

Great OpenStreetMap support (import etc)

Not all spatial operations (e.g. buffer)

projectNeo4j spatial

version0.6

sitewiki.neo4j.org/content/Neo4j_Spatial

licenseAGPL

Java Libraries

JTS

GeoTools

Hibernate Spatial

GeoToolkit

Proj4j

GeoLatte

OpenLayers ?

Google, Bing!, Yahoo! Maps ?

JTS

JTS Topology Suite

Geometric model

Geometric operations

Spatial structures and algorithms

I/O capabilitiesWKT, WKB, GML

projectJTS

version1.12

sitehttp://tsusiatsoftware.net/jts/main.html

licenseLGPL

GeoTools

GIS tools covering a widerange of topics

projectGeoTools

version2.7.3

sitehttp://www.geotools.org/

licenseLGPL

Many modulesReferencing (CRS, transformations,...)

Filtering (CQL, ECQL)

Rendering

Coverage (raster images in many formats)

Data access (DB, WFS, raster, shape,...)

ExtensionsSchema

Graph

WMS client

Validation

projectGeoTools

Hibernate
Spatial

Spatial extension forHibernate

Register your data provider

hibernate.dialect=org.hibernatespatial.postgis.PostgisDialect

Special type for storing a Geometry

@Column(name = "geom")@Type(type = "org.hibernatespatial.GeometryUserType")private Geometry geometry;

Spatial queries, also using Criteria

DB support: PostGis, Oracle10i, MySQL, MSSQL, GeoDB (H2)

projectHibernate Spatial

version1.1

sitehttp://www.hibernatespatial.org/

licenseLGPL

GeoToolkit

GIS tools covering a
wide range of topics

Module basedReferencing

Coverage

Display (swing)

Analytics

Originally a fork of (part of) GeoTools but with cleanup and refactoring, and Java6 only

projectGeoToolkit

version3.19

sitehttp://www.geotoolkit.org/

licenseLGPL

Proj4J

Java version of Proj4

CRS handling

transformations

projectProj4J

version0.1 (-snapshot)

sitehttp://trac.osgeo.org/proj4j/

licenseMIT?

GeoLatte

Reusable GIS components

ModulesBase: transformations, filtering, GeoJSON

Featureserver: access data through Hibernate spatial

Graph

Mapserver

Maprenderer

projectGeoLatte

version?

sitehttp://www.geolatte.org/

licenseLGPL

Notable non-Java projects

OpenLayersJavaScript

Powerful

Popular

Not open sourceGoogle maps / Bing / Yahoo! mapsFree/open?

Data +/-

Java servers and frameworks

GeoServer

Deegree

uDig

gvSig

Puzzle-GIS

OpenJUMP

GeoKettle

GeoNetwork

SEXTANTE

Geomajas

GeoServer

Share and edit
geospatial data

Render data to WMS

WFS interface to your data

Integrated OpenLayers as default viewing engine

Built on GeoTools

Integrate with ArcGIS, Google Maps/Earth; Yahoo! Maps, MS Virtual Earth

projectGeoServer

version2.1.2

sitehttp://geoserver.org/

licenseGPL

projectGeoServer

deegree

supplies building
blocks for
Spatial Data Infrastructure

Implements OGC and ISO/TC 211 standards

Building blocksWeb services (WMS, WFS, WPS, WCS, Gazetteer,...)

iGeoPortal

iGeoSecurity

iGeo3D

iGeoDesktop

projectdeegree

version3.0.4 Celcius

sitehttp://www.deegree.org/

licenseLGPL

projectdeegree

uDig

Desktop GIS

Based on Eclipse RCP, JTS,
GeoTools

View, edit and print GIS data

Can be extended/customized using plug-insJgrass, Eurobios, DEWS

projectuDig

version1.2.2

sitehttp://udig.refractions.net/

licenseLGPL

projectuDIG

gvSig

Desktop GIS

Same view local and remote(through OGC standards)

Extensible

GvSig Mobile

Remote sensing

3D support

projectgvSig

version1.11

sitehttp://www.gvsig.org/

licenseGPL

projectgvSIG

Puzzle-GIS

Desktop GIS

Based on NetBeans platformand GeoToolkit

Multi-screen, multi-project at same time

Clear separation source/map/view

projectPuzzle-GIS

version.07

sitehttp://puzzle-gis.codehaus.org/

licenseLGPL

projectPuzzle-GIS

OpenJUMP

Desktop GIS

Save, edit-analyze GIS data

Flexible plug-ins

projectOpenJUMP

version1.4.2

sitehttp://www.openjump.org/

licenseGPL

projectOpenJUMP

GeoKettle

Spatial extension of Kettle(Pentaho Data Integration)

ETL tool, build spatialdata warehouse

Builds on GeoMondrian, spatial extension of Mondrian

Extract also from spatial data sources

Transform also spatial operations (project, geocode,...)

projectGeoKettle

version2.0

sitewww.spatialytics.org/projects/geokettle/

licenseLGPL

projectGeoKettle

GeoNetwork

Catalog application to
manage spatial resources

Metadata editing

Search functions

Embeds GeoServer (optional)

projectGeoNetwork

version2.6.4

sitehttp://geonetwork-opensource.org/

licenseGPL

projectGeoNetwork

SEXTANTE

Spatial data analysis library

+300 geo-algorithms for raster and vector data processing

Graphical components to run and use those algorithmsIncluding graphical modeler

Integrates with many GIS toolsgvSig, OpenJUMP, uDIG

Split of from gvSig

projectSEXTANTE

version0.6

sitehttp://sextante.forge.osor.eu/

licenseMIT

projectSEXTANTE

projectSEXTANTE

Geomajas

Integrate, transform
and secure GIS data

(web) application framework / Spatial Application Server

Built on GeoTools, JTS, Spring, GWT, Hibernate Spatial

Faces for front-end/clientsGWT, SmartGWT, GeoJSON

Generic layers for data accessWMS, WFS, GeoTools data source, Hibernate Spatial

Plug-ins for extensionCaching and rasterization, printing/PDF, security services, geocoder

projectGeomajas

version1.9.0

sitehttp://www.geomajas.org/

licenseAGPL

projectGeomajas

Thin client

Server for heavy-liftingAllows security

Data transformation

Integration with
back-end processes

projectGeomajas

projectGeomajas

Q & A

Joachim Van der Auwerahttp://blog.progs.be/
Geosparcjoachim@geosparc.com
@joachimvda
http://geosparc.com/