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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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Presentation on theme: "1 Grids and GeoStatistics Vilni Verner Holst Bloch MSc. landscape ecology and natural resources Statistics Norway Otervegen 23 N - 2225 Kongsvinger Tel."— Presentation transcript:

1 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 : vvh@ssb.no Routines for delivering products to the national spatial data interest/infrastructure community 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

2 2 Overview of the presentation Background – introduction Defining the grid Making guidelines for geostatistics Standards and metadata Confidentiality and quality Further work and deliveries

3 3 Background Statistics Norway Registers on address level Population Buildings Ground Properties Sport facilities Farms Businesses And many more Partnership in Norway Digital (obligations) Expressed needs from partners

4 4 Background Download page for Norway Digital partners

5 5 Background Formalising a national grid for geostatistics Internal drive within Statistics Norway (coming censuses, preparations for a geodatabase)

6 6 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.

7 7 Defining the grid Grid nameCell size Number of cells SSB100m (1)0.01 km2Approx. 35 000 000 cells SSB250m (1)0.0625 km2Approx. 5 600 000 cells SSB500m (1)0.25 km2Approx. 1 400 000 cells SSB1km1 km2Approx. 350 000 cells SSB5km25 km2Approx. 15 000 cells SSB10km100 km2Approx. 15 000 cells SSB25km (2)625 km2Approx. 500 cells SSB50km (2)2 500 km2Approx. 150 cells SSB100km (2)10 000 km2Approx. 40 cells SSB250km (2)62 500 km2Approx. 10 cells SSB500km (2)250 000 km2Approx. 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

8 8 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: Defining the grid

9 9

10 10 Defining the grid

11 11 Defining the grid Projection and datum All SSBgrids are defined in UTM33/EUREF89. Extention SSBgrids have no definite extention. Exchange format SSBgrids have no particular exchange format.

12 12 Organisation – responsibility and contact points S320 Population statistics Paul Inge Severeide (Head of division) Gjermund Nygårdseter (GIS contact 62 88 52 25) S410 Enterprise register Jan Ole Furseth (Head of division) Beate Bartsch (GIS contact 62 88 50 38) S430 Agricultural statistics Ole Osvald Moss (Head of division) Anne Snellingen Bye (GIS contact 62 88 52 39) S460 Construction and services statistics Roger Jensen (Head of division) Birgit Bjørnsgard (GIS contact 62 88 50 97)

13 13 Quality checks Units with coordinates# records in original file # grid cellsDif. (n)Dif.(%) Enterprises 200835 96035 86199 0,28 Population 200055 74955 65397 0,17 Population 200155 99255 797196 0,35 Population 200255 94655 812134 0,24 Population 200356 82956 74387 0,15 Population 200455 80555 72185 0,15 Population 200555 67255 58885 0,15 Population 200655 70355 61688 0,16 Population 200755 57255 48953 0,10 Population 200855 54655 46780 0,14 Buildings 2006115 801115 370434 0,37 Buildings 2007116 170115 738435 0,37 Buildings 2008116 509116 130382 0,33 Farms 199933 40633 30998 0,29 Farms 200626 99326 90984 0,31

14 14 Confidentiality rules Population by 1 square kilometre grid. Finnmark county. 1.1.2008. EnterprisesNo lower limit Population1 – 9 => 5 BuildingsNo lower limit FarmsNo lower limit

15 15 Metadata Task: To transfer existing metadata to an xml-document

16 16 Metadata Lots of standards and tools

17 17 Metadata editor – INSPIRE online

18 18 Metadata editor – ESRI ArcGIS

19 19 Metadata editor – ESRI ArcGIS

20 20 Metadata editor – OS MapWindow GIS

21 21 Example : UML modell for adm. boundaries Metadata

22 22 Are people blue in Java?

23 23 … and red in Japan?

24 24 Example: Identification of residents within a distance from a hospital. Use Presentation Delimitations Interpretation Making guidelines Article in print

25 25 From noise to information

26 26 Preliminary suggestions Topography Population Bathymetry Employees Buildings

27 27 Possible future deliveries Households Dwellings Income Migration Education Agricultural statistics Historical statistics

28 28 Further work and cooperation Products developed in cooperation with users Enhanced metadata Improve quality checks and measures Make guidelines for use of products System for exchange of data Thank you


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