Annotating WMS with XIMA (How to scribble on your map) Ian Turton Centre for Computational Geography University of Leeds

Summary What? Why? How?

What is Annotation? 1.The act or process of furnishing critical commentary or explanatory notes. 2.A critical or explanatory note; a commentary. In geography often refers to adding a note to a map

Why Annotate? Draw attention to a point of interest Communicate Collaborate Summarise Highlight patterns, similarities /differences

Open Standards Availability –Open Standards are available for all to read and implement. Maximize End-User Choice –Open Standards create a fair, competitive market for implementations of the standard. They do not lock the customer in to a particular vendor or group.

Requirements Annotations… –Are independent features –Must annotate something –Often point to a spatial subset of an image –May link to many maps or images –May have different shapes on different maps –May have rich content –May have properties

Xima history 2001 – initial version –OGC – GML based version –OGC – GML in JPEG 2000 for Geographic Imagery (GMLJP2) –OGC

Xml IMage Annotation (XIMA) version 1 Allows users to draw points, lines and polygons on to an image (WMS maps are images). User can attach text, images, video, URLs to the geometry. The xima representation can be stored on a server and passed to other users. A xima aware client can allow users to access the content of the annotations.

Annotated Map

Types of Annotation version 2 Label Point of Interest Region of Interest Feature of interest

Label Forest Fires

Point of Interest fire source Fire Source

Region of Interest 0,0 100,0 100,100 0,100 0,0 fire impact region Fire Impact Area June 2003

Feature of Interest forest road Feature Database (e.g. OGC WFS) Feature pointer Fire Access Road

Simpler implementation No need for specialist clients or servers GML features stored in transactional WFS Any WFS client can now display annotations.

Annotation for jpeg2000 Splits the annotation into –Pointer A GML curve –Content A label or image –Annotates GML geometry

Specialised Annotation elements PointOfInterest CurveOfInterest RegionOfInterest FeatureOfInterest Can be styled using gml:defaultStyle or SLD

Conclusions Annotating maps and images is a good thing. XIMA is not yet a standard but its getting there. Watch this space.