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Representation by Geo-Information

- tree tales -

120925|LAR33306

Ron van Lammeren

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Tree representation

PPS | National tree database, 2011 2/31

Point, Area Area, Volume Point, Simple Volume Point, Complex Volumes

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Geo-data everywhere

3/31Lammeren, 2011

Geo data ensembles

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Representation of real world phenomena

Geo-data is based on (purpose driven)

Spatial perception

Spatial description

(Geometric) Data structure

Tabular description (database)

geometric (coordinates)

thematic (attributes)

For example Maguire et al, 2010

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World and W

orld

Above Nasa-wind map

Below Eratosthenes world map

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Reflection on (solving) complex spatial-temporal problems with GIS andRemote Sensing approaches and techniques (Goodchild, 2004)

Where is what?

Where has what changed?

Where will what change?

inventory and status mapping

monitoring and change detection

scenario studies and prediction

Geo-information Science

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http://www.grontmij.nl/NR/rdonlyres/EDBC764B-DB35-461C-A74C-D5921044D1B1/1754/GeoVisuAll.JPG

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Real world Phenomena

7/31WU-GRS, Clevers et al, 2011

continuous phenomena

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Tactile and Virtual

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Cadaster NL, 2006

discrete phenomena

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Wageningen and Wageningen

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WUR-Geodesk, 2012

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Data and Graphics

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Student work GRS51306, 2010

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Data and Graphics

11/31Student work GRS51306, 2010

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Measured and Sketched

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Left, field sketch students GRS10306, 2011

Right, AHN2, 2011

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WUR|PPS National Tree Database, 2012

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Accuracy and Precision

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Left, Longley et al, 2011

Right, ESRI 2011

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Accuracy and Precision

16/31LAR thesis Joosten, 2012

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Generalisation

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Right: Longley et al, 2011

Under: Lammeren et al, 2007

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Static and Dynamic

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Top: Talentorganisatie, 2012

Under: WU-GRS/FEM thesis, Bergsma, 2011

spatio-temperal data

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Perception and context

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Weitkamp et al, 2009

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Globe and Plane

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Earth Spheroid Projected

Map

Map

Grid

Mathematical

Representation

Geo Datum

Map

Projection

Projection Plane

Orientation

Distortion

Reference / map scale

Transformation

Grid - units

(False) Origin

only Horizontalreference !!

Principal scale Local scale Map scale

Geographic coordinate system

Projected coordinate system

GRS10306, Lammeren et al, 2010

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Reference systems

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GRS10306, Lammeren et al, 2010

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Positional accuracy

GRS51306, Lammeren et al, 2011

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2D and 3D

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+ =

primitives

+ =

bit

plane

3D trees

GRS51306, Lammeren et al, 2010

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Map: UK ordnance survey, 2008; Photo: Lammeren, 2009

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Horizontal and Vertical

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GRS10306, Lammeren et al, 2011

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Context and Interest

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Right | GRS10306

Under | WUR_CGI, Kramer et al, 2012

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Standards and Cultures

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Conclusions on representation

of real world phenomena

Culture based

Context ! and interest of project / research

Perception based phenomena definition

Globe as a reference (horizontal and vertical )

Coordinate reference system ( 2D vs 3D georeferences, projection)

Geometrical definition ( generalization, precision, 2D vs 3D)

Accuracy (meaning and geometry)

Data type ( raster vs vector)

Graphical presentation (graphic attributes, 2D 3D , story to be told)

! Availability and accessibility !

BUT geodata ensembles are possible thanks to geographic coordinatesand the many geo-data handling options

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Google Earth | Kramer et al, 2011

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