ACE2 → CAL · Windows

Convert ACE2 to CAL

ACE2 to CAL for whole archives of tiles, layers or survey files at once, with nothing uploaded and no account required.

Got a folder full of ACE2 files? reaConverter batch converts them to CAL in minutes, not hours. Local processing means instant results, even with thousands of files. Survey and cadastral data stays on your machine, with no upload at any point.

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ACE2 to CAL
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.ace2.CAL
4.8

Converting files since 2001

Runs offline — nothing uploaded

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How to Convert Multiple .ace2 Files to .cal?

1. Download and Install reaConverter

First, grab reaConverter from the download button below. Installation is fast, and the software runs offline — no account or signup needed.

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Install reaConverter

2. Load your ACE2 files

Add your ACE2 files to reaConverter. Whether it's a handful or an entire archive, the batch engine processes them efficiently.

Browse for files, drag them in, or add entire folders at once. reaConverter queues everything automatically.

Load your ACE2 files into reaConverter

3. Select CAL as output format

Pick CAL as the output format. If the data is going back into a GIS, choose a format that keeps coordinates and attributes; JPG, PNG and PDF suit maps for reports and slides.

Select CAL as output format

4. Start ACE2 to CAL conversion

Start the conversion with one click. reaConverter handles everything and notifies you when it's done.

Start Conversion

When the batch finishes, your CAL files are ready in the destination folder you chose earlier.

Step by step

How It Works

reaConverter offers the fastest, simplest solution for converting your ACE2 files into CAL without GIS software - all files processed on your PC for maximum privacy and speed.

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Technical note

What changes when you convert ACE2 to CAL

Every cell in an ACE2 file holds a measurement rather than a colour, usually elevation in metres, running from sea level up to whatever the highest point in the tile happens to be. CAL stores brightness, so the conversion stretches that range across a grey or colour scale. What you get is a readable picture of the terrain, and it is the right thing for a relief map or a figure. What you no longer have is the data: sampling a pixel in the CAL returns a shade, not an altitude. Missing cells in an elevation grid, such as water, radar shadow or the edge of a survey, are not empty: they hold a sentinel value, -32768 in SRTM, -32767 in DTED and very often -9999 in ESRI grids. Counted as a real height, that value stretches the scale so far that the actual terrain collapses into a few near-identical shades. When a CAL output looks flat and washed out, a void treated as data is the usual cause.

Map Data Workflow

Turn GIS data into something anyone can open

Not everyone who needs to see ACE2 data has GIS software. reaConverter renders it to CAL for a report, an email or a slide, and handles a whole folder in one run.

  • Render every file in a folder to CAL with the same size and settings
  • Set DPI and output dimensions before the run, not afterwards
  • 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
Creating marketing materials for various platforms requires multiple file versions from single sources. reaConverter's workflow automation lets us generate PNG, JPEG, and SVG variants from AI and PSD files simultaneously. The color profile management ensures brand consistency across all outputs, and the processing speed allows for last-minute changes without delaying deadlines.
Rebecca Turner
Rebecca Turner
Marketing Agency CEO
I was drowning in mismatched file formats until I found reaConverter. The one-click conversion and editing tools simplified everything, and the pricing is reasonable for small businesses. Now I spend less time troubleshooting and more time growing my brand!
Emily K.
Emily K.
E-commerce Entrepreneur
This program is incredibly simple and user-friendly, even beginners can use it with ease. It supports batch processing, works offline, and runs smoothly on my aging Acer Aspire laptop. Best of all, the output quality is outstanding!
Kevin Harris
Kevin Harris
Happy User
An efficient all-in-one solution for image conversion and light editing, designed for maximum user-friendliness.
Elena Anderson
Elena Anderson
Happy User
Enable shell integration for lightning-fast file conversions directly from Windows Explorer.
R. Lewis
R. Lewis
Happy User
After 200+ conversions on my budget laptop (i3-1115G4/4GB RAM/Win11), reaConverter outperforms heavyweight tools. Zero crashes, low CPU usage during batch processing, and no internet dependency - exactly what professionals need.
Walter Morgan
Walter Morgan
Satisfied Customer

FAQ

ACE2 to CAL Conversion

What are ACE2 files?

ACE2 is a raw binary raster format used to distribute the Altimeter Corrected Elevations (Version 2) global Digital Elevation Model (DEM), developed through a synergistic fusion of the Shuttle Radar Topography Mission (SRTM) dataset and multi-mission Satellite Radar Altimetry. Distributed primarily as 15 by 15 degree geographic tiles, a file of this type contains matrix elevations with spatial resolutions available at 3, 9, and 30 arc-seconds, as well as 5 arc-minutes. The format inherently lacks embedded geospatial metadata, meaning its exact georeferencing and spatial bounds are determined entirely by standard filename conventions referencing the southwestern edge of the southwestern-most pixel. Native compliance allows these files to be seamlessly integrated into specialized environmental, climate, and terrain modeling software.

What are CAL files?

A CAL image file represents a monochrome bitmap image that uses the CALS raster image standard for storing graphics data. This standard was created in the 1980s by the US Department of Defence as a compressed interchangeable image format. CAL and CALS are extensions used for similar purposes.

Can reaConverter convert ACE2 to CAL?

Yes! reaConverter instantly converts .ace2 to .cal 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 ACE2 to CAL 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 ACE2 to CAL online?

If you only need to convert a few ACE2 files to CAL format, feel free to try our free online free online ACE2 to CAL converter — perfect for small batches with no installation needed!

How can I turn ACE2 files into CAL on my computer?

The best way to change ACE2s to CALs 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 ACE2 to CAL.

How can I automate ACE2 to CAL 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 ACE2 files to CAL using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line ace2 to cal converter for batch processing.

What else can I do with reaConverter?

Convert DICOM filesCrop photoConvert medical imagesResize imageChange format settings

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