Home : File Types : QPJ File

.QPJ File Extension

File TypeQGIS Map Projection File

2.8 (4 Votes)
CategoryGIS Files

What is a QPJ file?

A QPJ file is a GIS map projection file created by QGIS, an open-source, cross-platform GIS application. It contains the coordinate reference system (CRS) and map projection used to transform a 3D representation of the Earth into a 2D plane. QPJ files are similar to the PRJ map projection files used by other GIS systems, but QPJ files contain QGIS-specific data.

More Information

Various amateur and professional geographers use QGIS to map, edit, and publish geospatial information. As part of using QGIS, geographers must create shapefiles, which use mapped points, lines, and polygons to denote geographic features and boundaries. QGIS shapefiles are actually composed of several component files, one of which is a QPJ file.

A QPJ file defines a coordinate reference system and map projection function that QGIS uses to transform the Earth's curved, ellipsoidal surface into a 2D plane, so geographers can draw 2D shapes (and thereby map data) upon that plane. Different QGIS maps use different CRSes and map projections to transform the Earth's surface into a 2D plane, depending on the location a geographer is studying and the analysis the geographer wants to perform.

QGIS map projections include QGIS-specific parameters that are used only by QGIS (such as the AXIS, EXTENSION, and AUTHORITY parameters). For that reason, when a geographer creates a new shapefile within QGIS, the program creates two map projection files: a QPJ file (used by QGIS) and a PRJ file (which can be used by other GIS programs, such as ArcGIS, when transferring data).

How do I open a QPJ file?

QPJ files are not meant to be opened by themselves. They are intended to be read by QGIS when a geographer opens a shapefile (.SHP file). However, because QPJ files are text files, you can open and edit them in any text editor if needed.

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Programs that open QPJ files

Updated 11/6/2020

About QPJ Files

Our goal is to help you understand what a file with a *.qpj suffix is and how to open it.

The QGIS Map Projection file type, file format description, and Mac, Windows, and Linux programs listed on this page have been individually researched and verified by the FileInfo team. We strive for 100% accuracy and only publish information about file formats that we have tested and validated.

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