1 Grids and GeoStatistics Vilni Verner Holst Bloch MSc. landscape ecology and natural resources Statistics Norway Otervegen 23 N - 2225 Kongsvinger Tel : ++47 / 62 88 50 62 Fax : ++47 / 62 88 50 97 E-mail : [email protected]Routines for delivering products to the ational spatial data interest/infrastructure commun http://www.stat.si/forumGs/ The European Forum for Geostatistics workshop in Bled, Slovenia 1rst – 3rd October 2008 The next step towards an integration of statistics and geography for sustainable development Session 2: Concept for an integrated web solution / An infrastructure for geostatistics. (The Subproject 3) A work in process
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1 Grids and GeoStatistics Vilni Verner Holst Bloch MSc. landscape ecology and natural resources Statistics Norway Otervegen 23 N - 2225 Kongsvinger Tel.
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Registers on address levelPopulationBuildingsGround PropertiesSport facilitiesFarmsBusinesses
And many more
• Partnership in Norway Digital (obligations)
• Expressed needs from partners
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BackgroundDownload page for Norway Digital partners
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Background
• Formalising a national grid for geostatistics
• Internal drive within Statistics Norway (coming censuses, preparations for a geodatabase)
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Defining the grid
SSBgrid is an open-ended definition of a family of spatial tessellation models for use in Norway.
The models are all built with quadratic grid cells.
The naming convention of the grids is to use the grid cell size, measured as the length of a side of a grid cell in meters or kilometers concatenated to the capital letters ‘SSB.
cell size is also denoted K, and with either m or km to indicate length measure.
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Defining the grid
Grid name Cell size Number of cellsSSB100m (1) 0.01 km2 Approx. 35 000 000 cellsSSB250m (1) 0.0625 km2 Approx. 5 600 000 cellsSSB500m (1) 0.25 km2 Approx. 1 400 000 cellsSSB1km 1 km2 Approx. 350 000 cellsSSB5km 25 km2 Approx. 15 000 cellsSSB10km 100 km2 Approx. 15 000 cellsSSB25km (2) 625 km2 Approx. 500 cellsSSB50km (2) 2 500 km2 Approx. 150 cellsSSB100km (2) 10 000 km2 Approx. 40 cellsSSB250km (2) 62 500 km2 Approx. 10 cellsSSB500km (2) 250 000 km2 Approx. 4 cells
(1) Because of limitations in many software packages and for practical use, these grids are recommended as grids with a county coverage.
(2) These grids might also cover sea territories. Number of cells refers to coverage of Norwegian mainland. One has however to be aware of deviations in grid cell areas for regions remote from the Norwegian mainland and Svalbard.
A system of standard grids
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Identification
• The identification (ID) of a grid cell with its southwestern corner at [XC,YC] in an SSBgrid with grid cell size K is
Computational efficiency
• Since a false easting is needed to compute XC and YC for locations along the western coast of Norway, the false easting used in the ID should be also used for this purpose when the ID is calculated directly from point coordinates:
KK
YTruncK
K
XTruncID
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10102
CC YXID 713 10102
Defining the grid
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Defining the grid
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Defining the grid
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Defining the grid
Projection and datumAll SSBgrids are defined in UTM33/EUREF89.
ExtentionSSBgrids have no definite extention.
Exchange format
SSBgrids have no particular exchange format.
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Organisation – responsibility and contact points
• S320 Population statistics Paul Inge Severeide (Head of division)Gjermund Nygårdseter (GIS contact 62 88 52 25)
• S410 Enterprise registerJan Ole Furseth (Head of division)Beate Bartsch (GIS contact 62 88 50 38)