Development of Dynamic SLD and Understanding WCS Using Geo-server Supervisor Prof N.L Sarda Dept. of...
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Transcript of Development of Dynamic SLD and Understanding WCS Using Geo-server Supervisor Prof N.L Sarda Dept. of...
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