Benefits of DIY site models

Thanks to advancements in BIM software, it is possible to build your own terrain models, based on 2D DWGs, which you will likely buy for Planning Applications anyway. These tools are handy for rough models, but can be time consuming if you aren’t a very advanced user. Highlights of this method include:

• Smaller initial costs (only need to pay for DWG)
• Experienced BIM users can build terrain models

Benefits of Cetopo

Having launched in the Nordics in 2020, and expanded to the UK and Netherlands in 2023, Cetopo comes backed by 1000s of happy users. It focuses on saving Architects time by automatically compiling information and providing users with all of the information they need, instantly, in one easy-to-use package. Highlights include:

• Instant access to combined models inc. terrain, buildings, roads, paths, trees
• Full native editability in all software
• Massive time savings
• Easy to use, no learning curve
• 2D DWGs included

A Cetopo model of the same area as above, in Revit

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So how do the workflows compare?

How can Architects use the models?

Editable: Models are designed to sit in your workflow, and are fully editable in all major architectural software. Buildings, roads, paths, terrain and trees, are all individual models grouped in layers for ease of use and editability.

Lightweight: Cetopo’s smart algorithm optimises models to run quickly in all design software, regardless of size. 

Rendering Optimised: Features include compatibility with Enscape assets, and ability to automatically replace tree models with Enscape trees (or .rfa trees in Revit)

How does accuracy compare?

Cetopo models are based on regularly updated data, and are very accurate. Detail levels vary per country, but here are the UK levels for example:

Terrain: Based on UK Gov LIDAR, accurate to +0.15m, continually updated.
Buildings: Based on OSMM and LIDAR, LOD2.
Roads: Based on OSMM, includes paths and pavements, updated every 6 weeks.
Trees: Based on LIDAR and UK Forestry, accurate in size and placement.

DIY models can vary massively in terms of accuracy, depending on the available information or skill levels, but could be something like:

Terrain: Based on 3D contours, accurate to contour spacing – typically 0.25m.
Buildings: Based on 2D footprints, photographs, and possibly 2D sections. Can be very prone to human error and guesswork.
Roads: Based on 2D plans.
Trees: Usually placed based on photographs, fairly inaccurate.

What does it cost?

Cetopo runs a subscription based service, with bulk discounts for more projects. Projects start at around €200 including access to all 3D and 2D data instantly, in as many formats as required. Customers can also download receipts for each project, allowing them to offset the cost to the client, or include it in their fee.

The DIY method may have less outset costs – you might only need to buy a 2D drawing, but could cost you up to a couple of days of one skilled person’s work time, and therefore incurs wasted salary costs. This cost will vary depending on the complexity and size of the project area. 

TLDR: Should I use Cetopo?

As described above, the decision whether or not to switch to an automated site modeller such as Cetopo depends largely on how much time you spend compiling and building models yourself. 

If you’re only working with very small sites, that you simply need as a backdrop to your design then DIY is maybe good enough for you. However, Architects who want to easily create stunning visualisations, work effortlessly with site models across modelling softwares and generally keep their fingers on the pulse might want to look a little closer at Cetopo.