# What is the scale of World of Warcraft's zone maps (converted from 100x100 coordinate grid system to yards)?

In an ongoing project of mine, I have collected the coordinate data for most quests in the game using the lua files within the current version of the WoWPro Guides addon. The goal of this project is to determine what zone has the most clustered questing routes mathematically. This would be via calculating the rough travel length of each route from the guides.

I have one problem: the coordinate data I have is based on a 100x100 grid which disregards what scale each zone map uses. Unfortunately, this makes the data mostly unusable for my project as one coordinate unit could be anywhere from five to twenty in-game yards. However, I have found this addon's sort-of companion, TomTom, somehow shows the distance to a waypoint in yards from a bird's eye view, which is perfect for a rough estimate of area for clustered objectives.

My main question is this: how might I most easily convert each coordinate from the 100x100 grid system of the zone map's coordinates to in-game yards but within a spreadsheet?

I did some preliminary testing with TomTom by taking my character's current coordinates in the zone and adding a large number to the Y coordinate of that location. This lets me determine how far away my character is from the new waypoint far away from my character, and with this, I divide by the large number I added to the coordinate (around 10000 or so) in order to establish the horizontal scale for that zone to around four decimal points of precision. With that horizontal scale, I determine the vertical scale by multiplying by 1.5 (the most common ratio between horizontal and vertical length for each zone map).

This sort-of works... but it's not easy. At this stage, I would have to go into the game and perform these range-finding tasks for every zone... which is a lot of them at this point.

What would be simpler is to determine how TomTom calculates the yardage and perform those calculations in my spreadsheet without the game needing to be run. I haven't yet been able to identify TomTom's method for determining the distance in yards to a waypoint, and I need help.

Is there some other method for converting 100x100 coordinates to in-game yards? Or does someone out there know how TomTom calculates the yards 'til destination for display below the crazy arrow and is willing to show me the formulas?