Production methodology

Considering the new land occupation needs of the main national users, who demand data with greater geometric, thematic and temporal detail, a new strategy has been developed in terms of production that is more focused on data integration than on photo-interpretation.

This new integration of various geospatial sources of high geometric, semantic and temporal detail, which we call High Resolution SIOSE, has as its main objective the integration, harmonisation and homogenisation of various official sources in order to continue to be a reference product in land occupation in Spain.

The first step is to create a basic scheme, on the date of the reference year (e.g. 2017), based on geometries from official sources that start or act as a backbone for the entire national territory and result in limits of areas or parcels that are considered "invariant" or with little capacity for change over time for the purposes of the project.

Geometric and/or thematic information from other key official sources of the territory is then integrated to obtain a geometric database with a multitude of thematic information from various sources:

• Cadastre
• First and second coverage of PNOA LiDAR data
• SIGPAC
• Information from the Farmers' Declaration
• Still photo of the Forest Map

 

Together with these, information from the SIOSE 2014, Hydrography and Transport Networks from the Geographic Reference Information is added, as well as the National Topographic Base 1:25.000 (BTN) and additional official sources from the Autonomous Communities.

In the case of the main sources (SIGPAC, Farmers' Declaration and Cadastre) the reference date chosen is the most coincident with the PNOA flights of the years corresponding to the SIOSE version, plus or minus one year. For example, 2017 ± 1. From the remaining sources, the most up-to-date data available are used.