Spanish Cadastre/Buildings Import
|Proposal||Data Conversion||Software||Validation||Import Guide|
Buildings Import describes a proposal being developed to import data provided by the INSPIRE Services of Cadastral Cartography of the General Directorate of Cadastre in Spain. If you want to participate actively go to the import guide. If you want to know all the details of the proposal, read on.
This project aims to manually conflate buildings and addresses imported from the INSPIRE Services of Cadastral Cartography of the General Directorate of Cadastre.
Data to import
The Directorate General of Cadastre, following the European Directive INSPIRE (Directive 2007/2/CE, Infrastructure for Spatial Information in the European Community), provides the INSPIRE Cadastral Cartography Services that allow the download of predefined geographic data sets using ATOM technology.
Among the geographical data that the Directive requires to harmonize is the Addresses (AD) and Buildings (BU), object of this importation.
These services allow the complete download by municipalities of the different INSPIRE datasets, which are updated twice a year.
Data source site
The links of the ATOM services are:
License of access and use
The license of access and use of the INSPIRE Services of Cadastral Cartography (PDF 100.5 kB, English version) allows the data offered by these services to be used to improve OSM. In summary:
Regarding the photos of facades accessible through links in the information service of buildings, the General Directorate of Cadastre authorizes its use to check house numbers citing the source.
Size of the data set
The data published in September 2017 contains 12 million buildings. With the data obtained during the validation of the conversion process, it can be estimated that the import would have a size of 177.8 million nodes, 33.2 million ways and 1.0 million relations. The OSM objects would comprise 15.5 million buildings (in 3D) and 770 thousand swimming pools. These are statistical and potential values, which would not be incorporated at once into the database, but will be divided into several phases according to the work plan.
This appendix shows the geographical distribution of the data.
The procedures to download the data, their full description, tagging plans for the data and the changesets, data reduction and transformation are described in this page: data conversion.
Some sample files are available in this repository. Files in .osm.gz format are the direct result of the process after executing the conversion tool. The files in .osm format are the result after having made a manual validation.
This is the strategy to avoid conflicts with existing data:
As we have detected some issues that require some editing, we plan to do a manual import reviewing each object to import. The import comprises two interrelated stages with two participant profiles:
The amount of data is huge and is updated twice per year. The time needed for reviewing and import all the data will be considerable. For this reason, we don't plan to transform and publish all the data in a centralised way, but split the work by zones and create projects in different phases following this work plan:
Work team profile
As described in the work plan, we propose a team approach that includes the participation of all types of collaborators, with profiles ranging from the "on the ground" to the desktop mapper, from the most experienced to the newbie, promoting the community and learning of new skills.
This import is intended to incorporate data to OSM with the highest possible quality, so we will carry checks before and after uploading the data.
Cadastre data is updated twice a year. We will developed a feature in the data conversion tool to compare two sets of data and generate files with the differences between them. The users responsible for each zone to be imported will be in charge of keeping the Cadastre files used to make the comparison later, and of periodically updating those changes that occur.
If necessary, the changes will be undone using the JOSM/Plugins/Reverter plugin.
Check on this page the progress of the import jobs.