Real data.
Short lessons with figures from the public registers — and about what the figures do not say. Every figure has its source and date, and every lesson ends with a quiz. No addresses: the houses are anonymous, and the places are public.
- 01 · Construction and installation
“The register says null”
The asbestos field in BBR (the Danish building register) is empty on almost every house. That does not mean the house is free of asbestos — only that nobody has written anything.
- 02 · All subjects and educations
Data quality: an empty register clears nobody
Two searches in the same register give two very different pictures. Learn to see what a figure counts.
- 03 · Construction and installation
BBR areas: built-up, total and residential
BBR has several areas for the same house, and each measures something different.
- 04 · Construction and installation
Two sources, two figures
The map's footprint and BBR's built-up area give two different figures for the same house. Both can be right.
- 05 · Construction and installation
The construction year gives away the hazardous substances
The environmental screening does not guess. It looks up the construction year in the Danish EPA's building atlas and gives a band per substance.
- 06 · Construction and installation
The atlas periods as a timeline
The building atlas divides construction years into periods. If you know the period, you know which substances to look for.
- 07 · Soil and landscaping · Construction and installation
Case: Østre Gasværk and B&W
Two old industrial sites in Copenhagen — and two ways of reading the soil contamination register.
- 08 · Construction and installation · Mathematics
The energy label: when does a proposal pay for itself?
The energy label gives proposals with an annual saving and sometimes an investment. The payback time is the investment divided by the saving.
- 09 · All subjects and educations
Source criticism: 503, 0 and null
Three answers that look like a no, but are not.
- 10 · Mathematics · Construction and installation · Soil and landscaping
Measure the plot
A land parcel is a polygon. With the corners' coordinates you can calculate area and perimeter yourself — and compare with the register.
- 11 · All subjects and educations
Cadastral districts are villages
The cadastre divides Denmark into cadastral districts (ejerlav). Many of them are the old villages.
- 12 · Soil and landscaping · Driving and transport · Mathematics
Fall profile: Himmelbjerget to Julsø
A terrain profile is a series of levels along a line. With the first and last level you calculate fall, gradient and angle.
- 13 · Construction and installation · Soil and landscaping
Building lines: which apply here?
Ten protection lines are looked up for one point. The answer says which ones the point lies inside and which act they come from — not whether you may build.