Opening GRI Files

The GRI file type is primarily associated with ArcGIS, DIVA-GIS, GDAL.

GRI	File extension: GRI
	File type:	grid-based geospatial file

What is a GRI file?

GRI files mostly belong to ArcGIS, DIVA-GIS, GDAL. GRI files contain grid-based geospatial data used in spatial analysis.
They hold data arranged in a regular grid, where each cell has a value that can represent environmental responses, geoid measurements, or backup information. This structure supports many tasks in GIS work.

• Gridded Response Image – Used by Maxent to store data similar to the ESRI ASCII Grid format. See more at Maxent.
• Geospatial Raster Image – Employed by DIVA-GIS, it arranges data as a raster grid.
• Gridded Geoid Data File – Utilized by GeoidEval, these files represent geoid variations; for details, visit NOAA Geodesy.
• Gridded Response Information – Found as binary grid files in applications like Golden Software Surfer and Esri ArcGIS. Additional information is available at Golden Software and XMSWiki.
• NATURASOFT Backup File – A distinct variant used within the NaturaSoft program; more can be found on the NaturaSoft website.

Purpose and Functionality:
FilExt.com notes: GRI files are designed to store continuous data sets in a grid format. This means they can be used to model spatial phenomena, display environmental gradients, or serve as backup files for specialized programs. They may be encoded in ASCII or binary forms, so knowing the file’s source helps in choosing the right application to open and view the data.

How to open GRI files

You need a suitable software like ArcGIS, DIVA-GIS, GDAL to open a GRI file. Without proper software you will receive a Windows message "How do you want to open this file?" or "Windows cannot open this file" or a similar Mac/iPhone/Android alert. If you cannot open your GRI file correctly, try to right-click or long-press the file. Then click "Open with" and choose an application. You can also display a GRI file directly in the browser:. Just drag the file onto this browser window and drop it.

Online GRI Text Viewer

Choose your .gri file to analyze

or drag and drop it here

Online File Viewer

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GRI file format details:

To find out what program is needed to open GRI files, you need to determine the file format. Often, the file format can be deduced from the file extension or the initial bytes (called the signature). Frequently, however, one file extension is used by different programs for different file formats, and one file format for different file extensions. So you need a detailed analysis of a file to find out the format and the associated program. Our evaluation of the GRI files is as follows:

GRI is not a commonly used file extension and includes various formats for various programs. The two most common formats are as follows:

• 30% of all GRI files start with the bytes ñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØñØ, which are crucial for this file format. These are binary files, so they do not contain words or text. The files are 230 KB to 11 MB in size, with a median of 2 MB. The file type was developed only in the last few years. A usual file name is IND_msk_alt.gri or PHL_msk_alt.gri.
• 8% of all GRI files use the same file format, which have the signature 00 00 C0 7F 00 00 C0 7F. If you open these files in a text editor, you will see only illegible characters. The average file size is 58 MB with most files being between 130 KB and 220 MB in size. These files are often associated with merged.

All other GRI files (62%) have no consistent format. They are often associated with mean or ment. Just click the "Choose your .gri file to analyze" button on this page to find out what your GRI file is.