SIGDEM → IGS · Windows

Convert SIGDEM to IGS

Convert SIGDEM to IGS without installing QGIS or writing ogr2ogr commands. reaConverter reads GIS data directly and works through whole folders in one pass.

reaConverter transforms SIGDEM files to IGS quickly and reliably. Drag in folders, set your options, click Convert, done. No cloud accounts, no file uploads, no complicated setup. Just install and start converting. Surveyors and planners use it to pass GIS data to colleagues who work in other software.

DownloadSIGDEM to IGS ConverterConvert
SIGDEM to IGS
Online
.sigdem.IGS
4.8

Converting files since 2001

Runs offline — nothing uploaded

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How to Convert Multiple .sigdem Files to .igs?

1. Download and Install reaConverter

reaConverter installs quickly on any Windows PC. No dependencies, no bloatware — just a clean setup that's ready to use immediately.

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Install reaConverter

2. Load your SIGDEM files

Load your SIGDEM files into reaConverter. You can add individual files or point to folders, and the software will queue everything automatically.

Select SIGDEMs from a folder or drag-and-drop them directly into the reaConverter window.

Load your SIGDEM files into reaConverter

3. Select IGS as output format

Pick IGS as output format and choose the destination folder where you want to save new .igs files.

Select IGS as output format

4. Start SIGDEM to IGS conversion

Press the Convert button and reaConverter takes care of the rest. Processing time depends on file size and volume.

Start Conversion

After processing, find all your new .igs files in the output location. The log shows details for each conversion.

Step by step

How It Works

reaConverter offers the fastest, simplest solution for converting your SIGDEM files into IGS without GIS software - all files processed on your PC for maximum privacy and speed.

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Technical note

SIGDEM to IGS: what to expect from the conversion

Geospatial coordinates are absolute positions on the earth, and they are large: a projected easting runs to six or seven digits, while latitude and longitude are small decimals. IGS expects a drawing laid out near its own origin in millimetres or inches. The geometry itself converts correctly, but it can land tens of kilometres from 0,0, or arrive at a scale where an entire county is forty units across. Zoom to extents first, then measure one known distance before dimensioning anything. SIGDEM is made of pixels and IGS stores geometry, so the conversion traces the image into real lines, arcs and polylines. The result is editable in CAD: entities can be selected, snapped to and measured, rather than a bitmap wrapped inside an IGS container, which is what a viewer or a lightweight converter usually produces. It is still derived geometry, so expect contours rather than a structured drawing. Dimensions, blocks and meaningful layer names were never in the SIGDEM to begin with.

Map Data Workflow

From map data to a working drawing

Site plans, utility routes and parcel boundaries often start out as SIGDEM and end up in IGS. reaConverter turns the layers into drawing entities in batch, so a full project folder moves across in one run.

  • Convert every layer in a folder to IGS with the same settings
  • Go the other way too, from DWG to Shapefile, when the GIS team needs the drawings back
  • Render the same data to PDF for a quick review copy
  • Pick up new data automatically with Watch Folders, or script the job from the command line

Everything runs on your PC, which matters for cadastral, utility and client data that should not pass through an upload form.

GIS data conversion

User reviews

What people say after the first batch

Average User Rating:4.8
Last updated on September 13, 2026
5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs.
J. Mitchell
J. Mitchell
Satisfied Customer
reaConverter is pure gold! Rock-solid performance with zero crashes. No internet needed—perfect for travel or low-connectivity work. The ultimate offline alternative to sketchy web converters. Plus, the desktop version keeps sensitive files secure since nothing ever gets uploaded to the cloud.
Malik T. Martin
Malik T. Martin
Satisfied Customer
I was skeptical at first, but reaConverter exceeded my expectations. The interface is intuitive, and the advanced settings let me tweak outputs perfectly. Plus, the customer support is fantastic!
Sarah Lane
Sarah Lane
Satisfied Customer
An ultra-fast solution for minimizing file sizes. The entire conversion process takes just 3 minutes!
Logan B.
Logan B.
Satisfied Customer
I use the online converter — it’s quick and hassle-free!
Jian Wong
Jian Wong
Happy Online User
Working in a print studio means constantly juggling obscure file formats. I used to waste hours Googling converters or installing random software — until reaConverter became my Swiss Army knife. Install it once, and you're set forever. No internet? No problem!
Helen Evans
Helen Evans
Satisfied Customer

FAQ

SIGDEM to IGS Conversion

What are SIGDEM files?

SIGDEM (Scaled Integer Gridded Digital Elevation Model) is a compact binary format for storing a grid of terrain heights. Instead of saving each height as a bulky decimal number, it records a whole number together with a scale and an offset, from which the true height is calculated, and this keeps the files small while retaining the accuracy needed for mapping work. A file of this type holds exactly one layer and begins with a short header that gives the position of the grid, the cell size, the scale factors, and the coordinate system, which is usually specified by its EPSG number. Files can also be packed with gzip or zip and keep the same extension in front. The format is open, and its specification is published on GitHub.

What are IGS files?

The IGS (Initial Graphics Exchange Specification) file format is a standardized CAD data exchange format used to transfer 2D and 3D model data between different CAD systems. Developed in the 1980s, IGES ensures compatibility across various engineering and design software by storing geometric data, annotations, and structure in a neutral ASCII or binary format.

Can reaConverter convert SIGDEM to IGS?

Yes! reaConverter instantly converts .sigdem to .igs with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

What is reaConverter used for?

reaConverter is a Windows converter for 800+ formats, GIS data among them. For SIGDEM to IGS it replaces the usual detour through QGIS, ArcGIS or ogr2ogr: add the files, pick the output format, and the whole batch converts offline. Surveyors, planners and engineering teams use it to pass data between GIS, CAD and everyday document formats.

Why choose offline conversion with reaConverter?

reaConverter is a software program that is used for offline files conversion. Your proprietary documents never leave your computer – essential for architects, engineers, healthcare and government contractors handling classified projects. Meets GDPR, HIPAA, CCPA, and corporate security policies by ensuring files never cross borders or third-party systems.

Can I convert SIGDEM to IGS online?

If you only need to convert a few SIGDEM files to IGS format, feel free to try our free online free online SIGDEM to IGS converter — perfect for small batches with no installation needed!

How can I turn SIGDEM files into IGS on my computer?

The best way to change SIGDEMs to IGSs on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from SIGDEM to IGS.

How can I automate SIGDEM to IGS files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert SIGDEM files to IGS using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line sigdem to igs converter for batch processing.

What else can I do with reaConverter?

Convert GIS filesConvert Gerber imagesConvert picture color spaceConvert whole-slide imagesImage resizer

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