The cadastral survey team of Geocom has been working on DM.flex data model (Version 20181116-DM.flex-AV-CH.ILI) in the past weeks. The basis for this was a joint workshop with Claude Eisenhut (Eisenhut Informatik AG) and the focus on Interlis 2 and its relation to DM.flex.
The team worked through DM.flex in intensive detail, looking for any challenges that arose with regard to our cadastral survey solution and always discussing possible solutions immediately.
At the moment the team is working on the export of an federal cadastral survey dataset from GEONIS to DM.flex using FME. The purpose of this is to gain more extensive experience with Interlis 2. This process also shows the cadastral survey team what actually needs to be changed or added to the current data to ensure a smooth transition of the “current” cadastral survey data models in GEONIS to a future DM.flex basis.
Topics exported to date:
- Fixed-point category1
- Fixed point category2
- Fixed-point category3
Exports currently being implemented:
- Municipal boundaries
- Land cover
- Real estate
- Currently only the legally valid or the current state can be output, since neither DM.01 nor the GEONIS data model considered a historization.
- Changes to our current workflows are needed. However, our cadastral survey solution should not have to be “rewritten”. Probably the topic of an history will bring the probably biggest change.
- As an example of a change compared to DM.01, there are disputed municipality boundaries, which were previously only noted as attributes, but are now drawn with DM.flex as separate lines over valid municipality boundaries.
In addition, the cadastral survey team has already created a 1:1 database based on the DM.flex data model. Based on these, existing workflows in GEONIS are adapted or the database is extended. GEONIS Cadastral Survey should ultimately be available with DM.flex as the basic model and fulfil the processes of (future) cadastral surveying.