How to produce a RASTER representing X coordinates?

In a journal article I have read that two rasters, representing X and Y coordinates respectively (see attached figure), have been entered as predictors in a GIS-based Logistic Regression for a given reason (namely, in order to reduce possible auto-correlation issues). I was wondering how such rasters can be produced in ArcGIS (10.1). The reference is:

Hu, Z., & Lo, C. P. (2007). Modeling urban growth in Atlanta using logistic regression. Computers, Environment and Urban Systems, 31, 667-688.

@Luke pointed out an earlier thread. I read it, and I see that different approaches have been suggested, mainly outside arcGIS. I would rather prefer to stick with the latter. I saw something that could fit my need, but I do not understand one thing: in the suggested workaround: xmap = (FlowAccumulation(1) + 0.5)*cellsize + xmin, what that (1) stands for? The same applies to the (64) in the suggestion for the ymap (namely, ymap = (FlowAccumulation(64) + 0.5)*cellsize + xmin)

This script is so simple that you should just try it. Just change the filepaths and filenames to what you need.

import arcgisscripting inraster = r'C:folderyour_raster' # if your raster is not a GRID, add the file extension (.tif etc) latraster = r'C:folderlatraster' lonraster = r'C:folderlonraster' gp = arcgisscripting.create(9.3) gp.CheckOutExtension("Spatial") gp.SingleOutputMapAlgebra_sa("Con(IsNull({0}), {1}, $$XMap)".format(inraster, inraster),lonraster) gp.SingleOutputMapAlgebra_sa("Con(IsNull({0}), {1}, $$YMap)".format(inraster, inraster),latraster) del gp