I have read literature on the above topic, I wish to develop a practical 3D cadastre in 1000Ha piece of land.
What steps do I need to take, what combination of software can I best use? What are the expected challenges?
That depends on the purpose of the 3D cadastre. Let's say you just need a kind of 3D guide for an area (I'm assuming an urban area). You could use a 2D building shapes map and extrude the shapes to each of the buildings height.
This would give no detail on buildings and some structures like bridges and tunnels would not exist. From this point of view you may need more complex meshes (triangular for instance). Flexible meshes are much more detailed but you need to build (sculpt) a 3D model first and then put it in the correct location of a map (for each building). This can also be very costly computationally (depends on the level of detail and number of structures).
A possible procedure would be:
1) Build a topographical map of your area.
2) Plot building shapes and structures (roads and similars) over the surface.
3) Extrude all shapes to their correct height.
Know I have an extrude 3D model. From here:
1) Prioritized building or structure importance.
2) Start replacing each of the extruded shapes with a good 3D model.
Just a final note. Each of the 3D models should have several versions with little to a lot of detail. This will ensure you'll be able to run the 3D cadastre in a lot of different systems (a very heavy model won't run correctly on a normal pc for instance).
As for software you have a lot of them for 3D modelling. I've never used software specific for 3D cadastre but there are a few. Anyway some general purpose examples are:
- Skecthup (http://www.sketchup.com/)
- FreeCAD (free: http://www.freecadweb.org/)
- Wings3D (free: http://www.wings3d.com/)
- Blender (free: http://www.blender.org/)
More specific 3D cadastre examples are:
- 3D GIS (http://www.esri.com/products/technology-topics/3d-gis)
- Geoweb3D (http://www.geoweb3d.com/)
- Bently products (http://www.bentley.com/en-US/)
- Sivan design (http://www.sivandesign.com/products/3dgis)
- GRASS GIS (free: http://grass.osgeo.org/screenshots/3D/)
I hope it helps.
The cadastre is meant to cater for a record of interests in land , geometric description of land parcels linked to other records describing the nature of the interests, the ownership or control of those interests, and the value of the parcel and its improvements. Also for fiscal purposes, legal purposes in order to assist in the management of land and land use and enable sustainable development and environmental protection.
For a hundred hectares of land, I suppose the Land should be vacant, without building on it. Therefore, Use DGPS in RTK mode for you data captutre, then you can process the data using surfer software and also AutoCAD. That will suffice for the preparation of the Cadastre of the land. Well, one hundred hectares is not a small land, therefore the field work will take you like two or three days, pending at what interval you want to pick your height details.
As indicated by Kawuna you can use RTK-GPS for data collection. And also you need to correct for the geoid separation to reference the GPS height to the geoidal system. For 1000 Ha this may take a day or two.
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