.ac7 — ArcGIS Catalog .sdc File
Esri · 1999
An .ac7 file is a metadata catalog for geographic data used by Esri's ArcGIS software.
Key Features
- Stores metadata for geographic datasets.
- Facilitates data organization within ArcGIS.
- References actual data files, not containing them.
- Primarily used by older versions of ArcGIS.
Best For
- Cataloging geographic data for ArcGIS 8.x and 9.x.
- Providing a quick reference to spatial data location.
- Maintaining metadata consistency within a project.
Less Ideal For
- Storing actual geographic vector or raster data.
- Sharing geographic data with users of non-Esri software.
- Creating new data catalogs in modern ArcGIS versions.
- Data interchange with other GIS platforms.
Common Use Cases
- Organizing large collections of spatial data.
- Providing descriptive information about map layers.
- Helping ArcGIS users locate specific datasets quickly.
- Archiving project metadata alongside geographic data.
How to Open It
- Open ArcGIS (versions 8.3 through 9.x) and navigate to the catalog tree.
- If the .ac7 file is linked to a workspace, it will appear in the catalog.
- Double-clicking the catalog entry will display its properties and associated data.
- Modern ArcGIS versions may still recognize and display these catalogs, but the geodatabase is the preferred method.
What is a .ac7 file?
An .ac7 file is a catalog file used by Esri's ArcGIS software suite, particularly older versions. It stores metadata and information about geographic datasets, such as shapefiles, geodatabases, and raster images. Think of it as a digital index that helps ArcGIS organize and quickly locate your spatial data. This file doesn't contain the actual geographic data itself, but rather pointers and descriptive information about where that data resides and its properties. While still functional in newer ArcGIS versions, it's largely been superseded by geodatabase cataloging features.
Programs That Open .ac7 Files
| Platform | Program | ||
|---|---|---|---|
| Windows | ArcGIS Pro | Paid | Official |
| ArcMap (ArcGIS Desktop) | Paid | Official |
Common Problems with .ac7 Files
Frequently Asked Questions
No, the .ac7 file is a catalog file that stores metadata about geographic data, not the data itself.
No, .ac7 files are proprietary to Esri's ArcGIS software and are not generally compatible with other GIS applications.
Modern ArcGIS versions primarily use geodatabases and their associated cataloging features, which have largely replaced the older .ac7 catalog file format for data management.
Technical Details
The .ac7 file is a binary file that acts as a data catalog, containing information like dataset names, descriptions, coordinate systems, and data types. It is part of the Esri ArcGIS ecosystem and relies on proprietary structures for storing and retrieving this metadata. It is not a self-contained data format but rather a reference file.