Development of Dynamic SLD

and Understanding WCS

Using Geo-server

Supervisor

Prof N.L Sarda

Dept. of Computer Science & Engg.

IIT-Bombay

Bharti

M.Tech (CS)

GISE Advanced Research Lab

IIT-Bombay

Contents_________________________________________

Open Geo-spatial Consortium (OGC)

Styled Layer Descriptor (SLD)

Introduction

About Geo-server

Need for Dynamic SLD

Scope

Styling

Labeling

Approach Used

Results

Further Work

Open Geo-spatial Consortium_________________________________________

Open Geo-spatial Consortium (OGC) is a global, non-for- profit organization of more than 400 companies.

The OGC baseline comprises more than 30 standards, including:

Web Map Service (WMS) : provides map images.

Web Feature Service (WFS) : for retrieving or altering feature description.

Styled layer Descriptor (SLD) : for user defined symbolization.

Styled Layer Descriptor_________________________________________

Maps exposed as WMS services can be symbolized using (SLD), an XML based

markup language.

SLD enables to create advanced rules for cartographic visualization of geospatial

data.

It can also be used with filters in order to define custom classes and categories for

creating thematic maps.

Introduction_________________________________________

The Web Map Service (WMS) Encoding Standard defines an encoding that

extends the WMS standard to allow user-defined symbolization and coloring of

geographic feature.

About Geoserver_________________________________________

It is a Java-based software that allows users to view and edit geospatial data.

It allows you to display spatial information to the world.

OpenLayers, a free mapping library is integrated into Geoserver making map

generation quick and easy.

Geoserver Login

Geoserver Main Page

Openlayers showing map from Geoserver

Need for Dynamic SLD_________________________________________

For creating dynamic and user-oriented web maps.

Two basic ways of styling

The simplest one is to color all features the same way.

To style features of the data differently dependent on some attributes.

Scope_________________________________________

Phase 1:

Run-time generation of SLD for better visualization

• Styling

• Geo-ext Styler

• Labeling

Phase 2 :

Understanding WCS Standard

• Geoserver

Styling_________________________________________

Geospatial data has no intrinsic visual components.

In order to see data, it must be styled. This means to specify color, thickness and

other visible attributes.

Data that Geoserver can serve consists of three classes of shapes: Points, Lines

and Polygon.

Points___________________________________________________________________

Simple Point

Simple Point with stroke

Rotated Square

Transparent Triangle

Point as Graphic

Lines____________________________________________________________________

Simple Line

Line with Border

Dashed Line

Polygon____________________________________________________________________

Simple Polygon

Simple polygon with stroke

Labeling______________________________________________________________

Defines the most basic way of controlling placement

Geoserver fully supports SLD specification plus adds a few extra parameters so

you can make pretty maps.

Point Labeling______________________________________________________________

Point with default label

Point with styled label

Point with rotated label

Line Labeling_________________________________________________________________

line with default label

label following line

Polygon Labeling_________________________________________________________________

polygon with default label

Approach Used_________________________________________

Open-layers provides a powerful foundation for web mapping applications.

Geo-ext Styler: An interactive styling application for geospatial data.

Geo-Ext Styler______________________________________________________________

It is built on open standards, using the Styled Layer Descriptor (SLD) XML

language.

Rendered with the Web Map Service (WMS) standard, which has extensions to

remote SLDs, and uses REST calls to persist styles to servers.

Results:: 1.Symbology1.1 Single Symbol (Point Layer)_________________________________________________________________

Selected Point layer Symbol as Star

Selecting the Color

Selecting the Style as Solid

The Final Result is

Line layer______________________________________________________________

Selecting a line layer

Selecting the color for line

The result is

Polygon Layer_____________________________________________________________

Selecting the fill color for polygon layer

Selecting the style as solid

Selecting the stroke color

The result is

1.2 Graduated1.2.1 Equal Interval_________________________________________________________________

Selecting the Column value as Shape_Leng

Selecting the classes as 4

Selecting the Mode as Equal Interval

The result is

1.2.2 Quantile_______________________________________________________________

Selecting the column vales as Shape_Area

Selecting the classes as 6

Selecting the Mode as Quantile

The result is

2. Labeling_________________________________________________________________

Selecting the Label tab

Selecting the label values

The Result of labeling is

Future Work______________________________________________________________

WCS provides a standard interface for how to request the raster source of a

geospatial image.

The results of a WCS can be used for complex modeling and analysis, as it

often contains more information.

It also allows more complex querying - clients can extract just the portion of

the coverage that they need.

References____________________________________________________________________

http://www.opengeospatial.org

http://opengeo.org/

http://opengeo.org/technology/openlayers/

http://opengeo.org/technology/postgis/

http://opengeo.org/technology/geoext/

http://geoserver.org/

http://docs.geoserver.org/stable/en/user/extensions/

http://docs.geoserver.org/trunk/en/user/styling/sld

http://opengeo.org/technology/geoext/coredevelopment/uniquethematic/

https://github.com/mbasa/GeoThematics /

Publications___________________________________________________________________

Dynamic and interactive thematic cartography with webmappin

applications by Kern, H.F. , Von Nathusius, V. in 2010

Using Web Map Service (WMS) With Styled Layer Descriptor (SLD) For

Creating Dynamic And User-Oriented Maps by BURDZIEJ J. Nicolaus Copernicus University, Torun, Poland

Thank You