Green roofs
Green roofs - oases in the urban area
A green roof is a roof which is partially or entirely covered by vegetation and soil or growing substrate. Therefore, urban environments in particular, which contain a great deal of built-up concrete areas and have the minimum of greenery, are discovering the potential of green roofs as one possible measure to prevent the formazion of heat islands, i.e. places with a noticeably higher temperature. Another of the main advantages of green roofs is their retention capacity, with rainwater collecting and gradually evaporating.
The aim of the analysis conducted by the Data Platform Department was to determine the maximum possible capacity of suitable green roofs where the transformation would make sense under certain conditions. The data showed that Prague has great unused potential, where up to 143 ha of green roofs (a total of 812 buildings) could be installed just on buildings owned by the city and its boroughs (category I), which in terms of area is equivalent to approximately 2 Stromovka parks. If green roofs are installed on privately owned buildings, the potential is far higher. Another outcome of the analysis is a list and description of buildings on which green roofs would be installed. This data needs to be used in line with the processor’s needs, and so we publish this data in open format and make it freely available for use.
The procedure used to filter and divide up the data, including a description of the individual categories and limitations of the study, are described in more detail in the Green Roofs Analysis document, which can be downloaded below.
Function
- Retain rainwater and slows runoff
- Protect roof damp-proofing insulation
- Reduce temperature fluctuations
Benefits
- Produce oxygen and retains carbon dioxide
- Reduce dust and noise
- Improve the appearance of cities and the landscape
- Create a habitat for insects
- Serve a community purpose
Green Roofs Analysis
The Green Roofs analysis can be downloaded below.
Downloadable PDF document (689 kB)
Map of the potential of green roofs
Roofs which can be converted to greenery under certain conditions are divided up into 4 categories. The most suitable roofs for this transformation are in category I, followed by, according to suitability, categories II, III and IV. The data from these categories can be displayed in the visualization either individually, or the categories may be displayed.
| Category | Number of building | Area in ha |
|---|---|---|
| Category I | 812 | 143 |
| Category II | 2 679 | 364 |
| Category III | 10 633 | 1 179 |
| Category IV | 21 339 | 1 659 |
Zooming out of the map shows the maximum number of buildings in each individual category, including the size of the areas.
Roofs with greening potential
Map visualization of buildings in Carto.The visualization can also be opened in a new panel.
Comparision of the area of Prague´s parks and the potential of green roofs
Source: www.lhmp.czPollutant absorption potential
Annual pollutant absorption potential upon greening of Category I (143 ha size). Source: www.opatreni-adaptace.czRainfall intensity affect the degree of water retention
Water retention was only analysed for extensive greening (up to 4 cm). Source: www.researchgate.netData resources
Green roofs - map layers
GIS layers used for this analysis can be found at www.geoportalpraha.cz/cs/opendata
Potenciál zelených střech
Mapové podklady k analýze potenciálu zelených střech v Praze. Výstupy vychází z mapových podkladů o podlažnosti budov, vlastnictví a využití území od Institutu plánování a rozvoje hlavního města Prahy.
Datové soubory
| Name | Format | |||
|---|---|---|---|---|
| Budovy vhodné pro zelené střechy - GeoJSON | GeoJSON | STÁHNOUT | ||
| Budovy vhodné pro zelené střechy - Shapefile | SHP | STÁHNOUT |
Cataloging entry
| Label | Value |
|---|---|
| Periodicita aktualizace | bez aktualizace |
| Licence | Creative Commons CCZero |
| Poskytovatel dat | Operátor ICT a. s. |
| Odkaz do katalogu | http://opendata.praha.eu/dataset/potencial-zelenych-strech |
