Discussion: Data Protection

Call for a European Guideline on Thresholds

(Rules of Confidentiality / Disclosure Control / Number Suppression / …)

Ingrid KamingerKartographie und GISSTATISTIK AUSTRIAGuglgasse 131110 WienTel : ++43 / 1-71128-7773 Fax : ++43 / 1-71128-7053 E-mail : Ingrid.Kaminger@statistik.gv.at

Data Protection

• necessary to avoid misuse

• fundamental right of each person

• regulation, law

-> Aim: common guideline to allow cross border projects

Various Solutions (1)

• Manipulating data (Sweden)

• Just classes – no numbers (Switzerland)

• Suppressing numbers (Austria, Denmark, Finnland, Norway, Slovenia)

-> Problem: numbers do not sum up to actual totals

Population(1km grid)

1 - 30> 30 UTM 33

Austria and Slovenia

Various Solutions (2)

• Aggregation with neighbouring cells

• Hierarchical Aggregation

• Individual Clustering

• Spatial Disaggregation

-> Sums are correct, but loss in detail

Hierarchical Aggregation

Current Thresholds 2006Population/ Households

Buildings Dwellings

Total Attr. Total Attr. Total Attr. Austria 0 >30 0 >3 0 >3 Denmark 0 >=20 Hh 0 Estonia >=3 >=3 cell >=3 >=3 cell >=3 >=3 cell Finland 0 >=10 >1 >1 >1 >1 France N/A N/A N/A Ireland N/A N/A N/A Latvia N/A N/A N/A Netherlands 0 0 N/A 0 5 Norway >3 >3 Poland N/A N/A N/A Slovak Rep N/A N/A N/A Slovenia >50 >50 Sweden >=3 >=3 cell 0 >=3 cell N/A Switzerland >3 >3

Thank you for your

• Contributions now

• Contributions later

• Attention