# PHOTOMOD Raster File

Driver short name

PRF

Driver built-in by default

This driver is built-in by default

PRF or MegaTIFF is an internal format of PHOTOMOD software for storing large images.

This format was developed to store images larger than 4 GB. As a basis for storing data used TIFF or JPEG2000 format. Raster is split into fragments (tiles) such that each fragment does not exceeded a predefined size (e.g., less than 1 GB). An overview file also added to process raster data on a small scales.

PRF files has two variations: ‘prf’ for imagery data and ‘x-dem’ for elevation data. Files can be georeferenced, but projection information can be stored only in external files (*.prj).

Image format has the following structure:

- the header XML file ‘image_name.prf’/’image_name.x-dem’

- folder ‘image_name’ with raster subtiles

- files *.tif/.jp2/.demtif inside folder ‘image_name’, containing raster fragments and the overview image

The driver support the data type among Byte, UInt16, UInt32, Float32 or Float64.

## Driver capabilities

Supports VirtualIO

This driver supports virtual I/O operations (/vsimem/, etc.)

## See Also

- Racurs company home page

- PHOTOMOD Lite home page