11.7.1 Average share of the built-up area of cities that is open space for public use for all
Data refer to 2020.
Interpretation
The indicator shows what share of the city's area is open spaces in public use for all, as well as what percentage of residents have access to these spaces within 400 m walking distance.
Public spaces available to everyone include open public spaces for rest and recreation (parks, squares, forests, playgrounds, other recreational areas), as well as land allocated to streets.
Here you can find a set of context indicators, the data for which come from official statistics of Statistics Poland. The purpose of context indicators is to complement the results of experimental SDG statistics, deepen information on the monitored phenomena and provide support in assessing progress in implementing sustainable development.
How did we calculate the indicator?
In order to calculate the indicator, the following stages were carried out:
1. The administrative boundaries of cities were determined from the PRG database (National Register of Boundaries).
2. Open public spaces located within city limits (parks, squares, forests, playgrounds, other recreational areas) were designated using OpenStreetMap.
3. The land allocated to streets was determined from the BDOT10k database.
4. The built-up areas of cities were determined using Sentinel-2 and Sentinel-1 satellite data.
5. Indicators of the availability of open spaces in public use for all in cities were determined (i.e. open public spaces and land allocated to streets). The value of the indicator 11.7.1 was calculated.
Detailed information on calculations based on the UN methodology can be found in the indicator metadata.
What sources were used to calculate the indicator?
The indicator was calculated based on the methodology proposed by the UN using data from five sources: Sentinel satellite data, Topographic Objects Database (BDOT10k) and National Register of Boundaries (PRG) databases maintained by Head Office of Geodesy and Cartography of Poland (GUGiK), and the WorldPop and OpenStreetMap databases.
Sentinel satellite data - data from the European Earth observation programme Copernicus. The indicators were calculated using data from the Sentinel-1 (radar data) and Sentinel-2 (optical data) satellites. Data resolution is 10x10 meters.
Topographic Objects Database (BDOT10k) is a vector database containing the spatial location of topographic objects along with their basic descriptive characteristics, corresponding in detail to a traditional topographic map on a scale of 1:10000. The database contains information about the type and category of roads, the type of road surface, as well as the width and length of the road.
National Register of Boundaries (PRG) is an official database providing basis for other spatial information systems. The PRG register collects data concerning area of the whole country, including: boundaries and areas of the units of the three-tier administrative division of Poland (i.e. voivodships, poviats, gminas).
The OpenStreetMap database is an internet community project aimed at creating a free, publicly available map of the globe. The data and maps created on their basis are published under the Open Database License.
Validation
Being prepared...
What is the meaning of the indicator for sustainable development?
Public space, as a place of particular importance in the structure of a city, can facilitate establishing relationships and building social bonds. A well-developed and properly designed network of urban public spaces promotes i.a. walking and social interaction. A system of open public spaces that can be accessed by all residents contributes to the development of social capital and enhances the quality of life in the city.
Applications for local government units
The indicator data provide information that may be useful in making decisions regarding land development, including allocating land for public spaces.