Carlson Civil Road Site and Land Development Design Software

Carlson Civil for road site and land development design

Carlson Civil is professional CAD-based civil engineering software for designing roads, sites, subdivisions, grading and other land-development projects. It combines terrain modelling with road geometry, profiles, cross-sections, lot design, earthwork and site-grading tools so engineers can move from existing survey information to a complete proposed design within one CAD environment.

The software is designed for civil engineers, engineering technicians, survey engineering firms, land developers and construction professionals who need to create buildable site geometry rather than simply draft lines on a plan. Design information can remain connected through surfaces, alignments and grading workflows, making it easier to evaluate how a change to one part of the project affects the surrounding site.

Design complete road networks

Road design is one of the main applications of Carlson Civil. Road Network allows engineers to combine alignments, vertical profiles and road templates into connected street and highway designs that can include intersections, cul-de-sacs and other roadway geometry.

Instead of treating every road as an isolated corridor, roads can be processed as part of a wider network. This is particularly useful for subdivisions, residential developments, industrial sites and business parks where several roads and intersections need to work together.

The resulting design can be represented in plan, profile, cross-section and 3D form. Surface information created from the road design can then be used for quantities, grading coordination, construction data preparation and further civil engineering work.

Work with horizontal alignments profiles and templates

A road is defined by more than its position on a plan. Carlson Civil provides tools for creating and managing horizontal alignments, vertical profiles and road templates so that the complete three-dimensional geometry can be developed from the centreline outward.

Existing-ground profiles can be extracted from terrain models and compared with proposed vertical designs. Templates define the road cross-section, including the geometry needed to represent lanes, kerbs, shoulders, sidewalks, ditches and other design components.

These elements can then be processed together to build the final road surface and cross-sections. For engineering teams, this provides a direct connection between the design geometry and the drawings or models used later in the project.

Design intersections cul-de-sacs and complex road layouts

Carlson Civil is built for road networks rather than only simple single alignments. Intersections can be incorporated into Road Network and coordinated with the connected roads, helping designers manage transitions between different alignments and templates.

Cul-de-sacs, traffic circles and other roadway arrangements can also form part of the design. Current Carlson 2026 tools extend Road Network with functions for designing and grading median traffic islands and for generating coloured TIN surfaces from the resulting road design.

These capabilities are particularly relevant to residential subdivisions, commercial developments and larger infrastructure projects where the road geometry needs to respond to several connected site features.

Quick driveway grading from roads to building pads

Current Carlson Civil tools include a driveway routine that grades a connection from a road to an elevated building pad. This addresses a common land-development task where individual properties, buildings or parking areas need practical access to the surrounding road network.

Rather than designing every driveway as an unrelated grading exercise, the road and pad elevations can form the basis of the connection. This can speed up preliminary site design and helps designers see how access requirements interact with the surrounding grading.

Create and manage terrain surfaces

Surface modelling is central to Carlson Civil. Existing survey points and 3D drawing information can be used to create triangulated terrain models, while proposed roads, pads and grading can form new design surfaces.

Contours can be generated from the surface, and the model can be inspected or edited before it is used for design calculations. Breaklines allow important terrain features such as kerbs, ridges, ditches and slope changes to be represented more accurately than a surface built from random points alone.

For engineers working from GNSS, total station, drone or LiDAR-derived survey information, this makes the surface model the connection between measured existing conditions and the proposed design.

Analyse existing and proposed ground

Once existing and proposed surfaces are available, Carlson Civil can compare them to determine where material needs to be excavated or filled. Cut and fill information can be calculated for complete sites or selected design areas.

This is useful during both design and construction planning. An engineer can use the information to assess whether a grading concept is practical, while a contractor or estimator can use the resulting terrain data as part of an earthwork workflow.

Cut and fill visualisation also makes it easier to identify areas where the proposed design creates excessive excavation or fill. The grading can then be adjusted before the project progresses further.

Balance earthwork across a site

Earthwork balance can have a major effect on the cost and logistics of a development. Carlson Civil includes tools for calculating and adjusting cut and fill so designers can assess whether material excavated on one part of a site can be reused elsewhere.

Site-volume balancing and cut/fill centroid tools can help evaluate the relationship between excavation and fill areas. In practical terms, this can support grading decisions intended to reduce unnecessary material import, export or movement around the site.

The final construction strategy still depends on soil conditions and project requirements, but having quantities available during the design stage gives engineers a better basis for evaluating different grading options.

SiteNET for grading quantities and site modelling

SiteNET is Carlson Civil’s layer-based workflow for site modelling and quantity calculations. It can automate parts of surface generation, subgrade design, material takeoff and earthwork analysis using drawing information organised according to the project setup.

This makes SiteNET useful for projects such as car parks, residential developments, commercial sites and industrial areas where several types of proposed features contribute to the finished terrain model.

The same site model can also support construction data preparation. Carlson specifically positions SiteNET as a route from civil design and quantity work into GNSS-assisted machine-control workflows, allowing finished design surfaces to continue toward the construction stage rather than being recreated from scratch.

Grade building pads parking areas and drainage basins

The Design Pad Template tools provide another practical grading workflow within Carlson Civil. They can be used for features such as building pads, parking areas, drainage basins and other defined site features that need to tie into surrounding terrain at controlled slopes.

For a building project, an engineer can establish the required pad elevation and then calculate the slopes needed to connect it to the existing or proposed ground. Similar methods can be used around parking areas, ponds and other site features.

This is useful where simple contour editing would not provide enough control over slope geometry, tie-ins and earthwork quantities.

Design residential and commercial subdivisions with LotNET

LotNET is Carlson’s subdivision and parcel-layout workflow. It can generate lots using an outer boundary, rights-of-way or centre lines together with design rules defined for the project.

This allows planners and engineers to test different subdivision layouts without manually redrawing every parcel after a road or boundary changes. Building footprints and setback requirements can also form part of the planning process.

Current Carlson 2026 improvements add custom setbacks for situations such as unusual setback requirements and corner lots, along with additional control over parcel edges. This gives land-development professionals more flexibility when a development does not fit a simple repeated lot pattern.

Link road lot and site design

The value of Carlson Civil becomes clearer when Road Network, LotNET and SiteNET are used together. A subdivision layout can define parcels and road rights-of-way, the road network can provide design elevations, and the surrounding site grading can then respond to those roads and development areas.

If a road alignment or elevation changes, related parts of the design can be updated rather than every drawing element being reconstructed manually. Carlson’s Civil workflow is designed around this type of dynamic relationship while continuing to use standard CAD entities rather than proprietary custom drawing objects.

For projects that go through many design revisions, this can make it easier to explore alternatives while still producing ordinary CAD-based deliverables.

Create profiles and cross-sections

Profiles and cross-sections provide the vertical information needed to check roads, terrain and other linear design features. Carlson Civil includes tools for creating and managing profiles from terrain surfaces and proposed geometry as well as producing cross-sections along alignments.

Existing and proposed ground can be compared to understand how the design changes along a road or corridor. Cross-sections can also support earthwork quantities and show how the proposed template relates to surrounding ground.

These outputs are useful both during design and when preparing drawings for review, tendering or construction.

Prepare civil designs for field layout and machine control

Civil engineering designs eventually need to leave the office. Surfaces, alignments, points and other construction information created in Carlson Civil can form part of the data-preparation workflow for field staking and GNSS-assisted construction systems.

This is useful for contractors and surveyors who need to transfer road and site designs into field software or machine-control workflows. By starting with the actual civil design model, the construction team can avoid rebuilding the same proposed terrain from printed drawings.

As with any machine-control or stakeout project, the final data should be checked against the approved construction drawings, coordinate system and project control before use in the field.

Useful for road and highway projects

For road designers, Carlson Civil combines horizontal geometry, vertical profiles, templates, intersections, cross-sections, surfaces and quantities in one environment. It can be used for local streets, subdivision roads, access roads and larger roadway design tasks.

The ability to model both the proposed roadway and the surrounding terrain also helps users evaluate cut and fill, side slopes, intersections and other transitions rather than concentrating only on the centreline.

Useful for site and commercial development

Commercial and industrial sites often combine roads, parking areas, building pads, access routes and complex grading in a relatively small area. Carlson Civil provides several tools for handling these different features within the same design model.

SiteNET and Design Pad Template can help develop the finished terrain, while Road Network can handle access roads and connected roadway geometry. Surface comparison then provides earthwork information for the overall site.

This makes the software useful for office parks, industrial developments, retail sites, warehouses, residential developments and other projects where finished grading needs to coordinate with buildings and access infrastructure.

Support for DWG DXF DGN and LandXML

Carlson Civil works with common engineering and CAD data formats including DWG, DXF, DGN and LandXML. This is important on multidisciplinary projects where surveyors, engineers, architects and contractors may not all use the same design software.

LandXML is especially useful for transferring civil information such as surfaces, alignments and related design data between compatible applications. Standard CAD formats provide additional flexibility when only drawing geometry needs to be exchanged.

Keeping project information in established industry formats can also make it easier to hand design data to survey and construction teams after the engineering work is complete.

IntelliCAD or AutoCAD working environment

Carlson Civil can run using the CAD platform supplied with Carlson or with a supported AutoCAD installation. The current Carlson 2026 installer includes IntelliCAD 12.1 and 13.1 and supports AutoCAD, AutoCAD Map and Civil 3D versions from 2019 through 2026.

Companies that do not already maintain an AutoCAD installation can therefore use the included IntelliCAD environment. Engineering offices that already standardise on a supported AutoCAD product can instead use Carlson Civil within that existing CAD environment.

Available individually or as part of Carlson Civil Suite

Carlson Civil can be purchased as an individual design module. It is also one of the four modules in Carlson Civil Suite together with Carlson Survey, Carlson Hydrology and Carlson GIS.

The suite is useful for organisations handling a wider project cycle. Carlson Survey provides survey-processing functions, Carlson Civil handles roads, sites and grading, Carlson Hydrology adds stormwater and drainage design, and Carlson GIS manages geospatial attributes and GIS exchange.

Because these modules operate within the same Carlson CAD environment, data can move between surveying, design, drainage and GIS work without every department rebuilding the project in a different software structure.

Who is Carlson Civil for?

Carlson Civil is primarily intended for civil engineers, civil engineering technicians, land-development consultants, road designers, survey engineering companies, construction data-preparation specialists and other professionals responsible for turning survey and terrain information into buildable infrastructure.

It is particularly suitable for companies working on roads, subdivisions, commercial developments, industrial sites, earthworks and other projects where surfaces, grading and quantities need to remain connected to the CAD design.

Carlson Civil from Global GPS Systems

Global GPS Systems can help determine whether Carlson Civil on its own provides the functionality required for your projects or whether Carlson Civil Suite is a better fit when survey processing, hydrology or GIS functions are also needed.

For businesses that collect existing-ground information with RTK GNSS, total stations, drones or LiDAR and then prepare design data for construction layout or machine control, Global GPS Systems can also help connect the field hardware and Carlson office software into a practical end-to-end workflow.