Technical Specification

This page describes some important technical details of SiMoD. It is, and probably will be incomplete.

Coordinates Resolution & Format

When working with SiMoD internals, you can see that the projected coordinates are not stored in the standard, nor in the 1E6 format. That's because we store all coordinates and distances scaled by 1E2 (1 cm resolution in case of UTM). We decided to use this increased precision because some algorithms we used or tested required perfect execution. With a resolution in meters, an inaccuracy of many seconds can appear due to the accumulation of numerical errors. To prevent error caused by a different rounding, we store all coordinates and distances as integers.