Fortaleza/PMF Buildings Import
|Proposal||Work Plan||Data Conversion||Import Guide||Corrections||Progress|
Buildings Import describes a proposal being developed to import data provided by the Fortaleza in Maps platform of the Fortaleza City Council in Brazil. If you want to participate actively go to the import guide. If you want to know all the details of the proposal, read on.
It is important to note that this import is semi-automated, due to the nature of the available data, that is, it is not possible to import the data all at once. This requires a higher user experience, taking more time to perform the import and the necessary adjustments for OSM upload.
This project aims to manually conflate buildings imported from the Fortaleza in Maps platform provided by city council.
Data to import
The data is provided by the Fortaleza City Council, through its open data platform called Fortaleza in Maps. The data comes from an aerophotogrammetric survey carried out in July 2010, being then a little outdated, and it is in SHP format. The data contains only the geometry information of the buildings and their height.
The data can be accessed on the Fortaleza in Maps platform (in Portuguese), through the following procedure:
License of access and use
The City Council created the Municipal Open Data Infrastructure of Fortaleza through Decree No. 13,474, of December 23, 2014 (in Portuguese). The Fortaleza in Maps website, also created by the city council on December 28, 2016, "... is accessible to population, being the main target audience professionals linked to the area of urbanism, economics and sociology, public agents and academia. One of the main objectives of the site is to expand access to information. In addition to the visualization of the maps, raw information is also available for download in multiple formats that can serve as an object of research or studies for the production of knowledge.".
For even more clarification, the user narceliodesa (on osm, edits, contrib, heatmap, chngset com.) contacted Iplanfor, the institute responsible for Fortaleza in Maps, and obtained authorization to data usage.
Size of the data set
The downloaded data is compressed in a ZIP file, occupying a space of 92 MB compressed, and 334 MB after decompression. According to QGIS, the file has 1,210,876 polygons.
This is the strategy to avoid conflicts with existing data:
A more detailed tutorial is available on the Import Guide tab.
However, given that there may be problems with imported data that require manual intervention, a manual import is planned with a review of each object to be imported.
The volume of data to be imported is very large. Therefore, it is proposed to carry out the work by regions, starting from the smallest to the largest. It is thought to carry out the division by neighborhoods, using the number of buildings as a parameter. In larger neighborhoods, work can be divided into blocks, if it is of interest to the volunteers. More details are shown in the Work Plan tab.
If necessary, the changes will be undone using the JOSM/Plugins/Reverter plugin.