Annotating WMS with XIMA How to scribble on your map

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Annotating WMS with XIMA(How to scribble on your
map)

• Ian Turton
• Centre for Computational Geography
• University of Leeds
• i.turton_at_geog.leeds.ac.uk

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Summary

• What?
• Why?
• How?

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What is Annotation?

• The act or process of furnishing critical
  commentary or explanatory notes.
• A critical or explanatory note a commentary.
• In geography often refers to adding a note to a
  map

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Why Annotate?

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

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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.

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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

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Xima history

• 2001 initial version
• OGC-01-019
• 2004 GML based version
• OGC-04-034
• 2005 GML in JPEG 2000 for Geographic Imagery
  (GMLJP2)
• OGC-05-047

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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.

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Annotated Map
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Types of Annotation version 2

• Label
• Point of Interest
• Region of Interest
• Feature of interest

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Label

• ltLabelgt
• ltgmlpositiongt
• ltgmlPoint srsName ..gt
• ltgmlposgt200 200lt/gmlposgt
• lt/gmlPointgt
• lt/gmlpositiongt
• ltlabelValuegtForest Fireslt/labelValuegt
• lt/Labelgt

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Point of Interest

• ltPointOfInterestgt
• ltgmlpositiongt
• ltgmlPointgt
• ltgmlposgt100 100lt/gmlposgt
• lt/gmlPointgt
• lt/gmlpositiongt
• ltlabelValuegtfire
• sourcelt/labelValuegt
• lt/PointOfInterestgt

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Region of Interest

• ltRegionOfInterestgt
• ltgmlextentOfgt
• ltgmlPolygon srsName"epsg4326"gt
• ltgmlexteriorgt
• ltgmlLinearRinggt
• ltgmlcoordinatesgt0,0 100,0 100,100
  0,100 0,0lt/gmlcoordinatesgt
• lt/gmlLinearRinggt
• lt/gmlexteriorgt
• lt/gmlPolygongt
• lt/gmlextentOfgt
• ltlabelValuegtfire impact regionlt/labelValuegt
• ltindicatedBygt
• ltArrowgt
• ltstartgt
• ltgmlPointgt
• ltgmlposgt-50 -50lt/gmlposgt
• lt/gmlPointgt
• lt/startgt
• ltendgt

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Feature of Interest

• ltFeatureOfInterestgt
• ltgmlpositiongt
• ltgmlPointgt
• ltgmlposgt155 160lt/gmlposgt
• lt/gmlPointgt
• lt/gmlpositiongt
• ltlabelValuegtforest roadlt/labelValuegt
• ltgmlfeatureMember xlinkhref"p1"/gt
• lt/FeatureOfInterestgt

Fire Access Road
Feature pointer
Feature Database (e.g. OGC WFS)
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Simpler implementation

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

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Annotation for jpeg2000

• Splits the annotation into
• Pointer
• A GML curve
• Content
• A label or image
• Annotates
• GML geometry

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Specialised Annotation elements

• PointOfInterest
• CurveOfInterest
• RegionOfInterest
• FeatureOfInterest
• Can be styled using gmldefaultStyle or SLD

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Conclusions

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