Astrometry is the branch of astronomy that involves precise measurements of the positions and movements of stars and other celestial bodies.
Small field CCD astrometry analyzes images of a tiny field of view, computing the precise position for each pixel in the image and indeed, the position for every object appearing in it. XParallax viu computes the mathematical transformation needed to get the right ascention and declination for each pixel in the image (and vice-versa). This is made by using catalog reference stars downloaded from CDS Vizier service. You can use this transformation in further image analysis.
What applications are suitable for this software?
It is useful in observatories where you want to provide full astrometricaly calibrated images. So the astronomers, just can start working with this images without worring about computing the reduction.
For amateur astronomers who wants to perform astrometic reduction of their images and/or measure the position of any kind of object detected. To perform, for example, minor body astrometry and generate Minor Planet Center reports.
Sometimes, astrometric reduction of CCD images is a first steep to start doing science with them. Many non-related astrometry works can get advantage of this software.
How do I start?
There are no restrictions on using it. Just download it and start working. If you are used to other astronomy software and apps you won't have any problems. Otherwise, check out these tutorials and other help resources to become familiar with the interface options.