Under Construction TopoExtract is currently under active development. Features, GIS datasets, and CAD tools are in preview mode.
UNDER CONSTRUCTION
3D TOPOGRAPHY CONTOURS & CAD EXPORTER

Instant 3D Topo Contours & Property Boundary Exports

Engineered for Land Surveyors, Civil Engineers, Architects, and Developers. Extract high-resolution elevation contours, align scanned boundary plats, and export 3D AutoCAD DXF & CSV matrices in seconds.

TopoExtract Interactive 3D Contour Map Interface
PostGIS Spatial Engine
26+ Million Contours Indexed
AutoCAD & Civil 3D DXF
State Plane Feet (EPSG:2273/2264)
Powerful Capabilities

Everything You Need for Site Planning & CAD Drafting

From initial property search to final 3D Civil 3D import, TopoExtract streamlines the entire terrain extraction pipeline.

3D AutoCAD & Civil 3D DXF Exports

Export native 3D polyline contours, major/minor layer annotations (`C-CONT-MAJR`, `C-CONT-MINR`), and property boundary vectors formatted specifically for AutoCAD and Civil 3D.

  • True 3D Elevation Coordinates (Z-Values in Feet)
  • Native State Plane Projection (SC EPSG:2273 / NC EPSG:2264)
  • Clean elevation matrix CSV files for terrain mesh creation
3D AutoCAD Contour Export

Aligned Property Survey Plat Overlay

Upload scanned paper plats, site plans, or PDF boundary surveys. Overlay and align them precisely onto satellite GIS parcel imagery using interactive Ground Control Points (GCPs), rotation, scale, and opacity controls.

  • 4-Point Ground Control Point (GCP) Pin Calibration
  • Live 3D rotation, scaling, and transparency controls
  • Combined DXF export with georeferenced survey overlay
Aligned Property Survey Overlay

High-Resolution GIS Topography Datasets

Access high-precision county contour datasets stored natively in PostGIS spatial databases. Real-time bounding box intersection delivers instant elevation matrix results.

  • Sub-second spatial queries for over 26 million contour lines
  • Direct integration with SC DNR and NC county contour databases
  • Interactive elevation color gradient & contour interval legend
High-Precision GIS Elevation Grid
Simple 3-Step Workflow

How TopoExtract Works

Get 3D CAD topographic contours in 3 easy steps.

1

Search Property or Address

Type any street address, parcel PIN, or click directly on the interactive map to locate the property boundary polygon.

2

Visualize 3D Topography

Instantly inspect 1ft elevation contours, elevation ranges, and align paper survey plats using ground control points.

3

Export to AutoCAD & Civil 3D

Download 3D DXF polylines, elevation matrix CSV files, and georeferenced survey packages directly into CAD software.

Video Tutorials & Walkthroughs

See TopoExtract in Action

Watch quick step-by-step video demonstrations of key features.

TopoExtract Overview Video Demo
03:15

Getting Started: Topo & DXF Workflow

Learn how to locate properties, inspect 3D contour lines, and export DXF drawings into AutoCAD.

Survey Alignment Video Demo
02:45

Aligning Paper Surveys to GIS Parcels

Step-by-step guide on using Ground Control Points (GCPs) and scale tools to align scanned survey plats.

Company Credits & Trial Video Demo
02:10

Shared Company Credits & Trial

How company administrators manage shared credits, team members, and toggle Unlimited Trial.

Flexible Credit System

Shared Company Credits & Trial

Unlock 3D CAD data once per property parcel — shared across your entire company.

$20 / Property Unlock

1 Credit unlocks 3D CAD DXF files, elevation matrix CSVs, and survey overlays for a property parcel. Once unlocked, all company team members have permanent access to download files anytime.