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The Calculate Max Elevation Figures tool computes the maximum elevation figures for a NATO Standardization Agreement (STANAG) based on the type of the highest vertical obstruction in a quadrangle. Two obstruction types influence the calculation: human-made and natural terrain. The calculation differs if one type is higher than the other.

The table below associates the STANAG term with the corresponding Calculate Max Elevation Figures tool.

STANAG term | Parameter name |
---|---|

Non represented allowance | MEF Vertical Obstruction Allowance |

Obstruction elevation accuracy figure | Vertical Obstruction Accuracy Value |

Terrain elevation accuracy figure | Terrain Accuracy Value |

## Human-made vertical obstruction

When a human-made vertical obstruction is higher than the highest natural terrain feature within a designated quadrangle, the Calculate Max Elevation Figures tool follows this process:

- Determine the elevation of the top of the highest human-made obstruction.
- Add the obstruction elevation accuracy figure, which takes inaccuracies in measuring the elevation of an obstruction into account.
- Determine the terrain accuracy figure and add it to the sum.
- Round the resultant figure up to the next higher 100-foot level, if necessary, to achieve a complete value in even hundreds of feet.

### Example

Elevation of highest obstruction (above mean sea level) = 6300 Obstruction elevation accuracy figure+ 25Sum elevation + elevation accuracy figure = 6325 Add a terrain height accuracy figure to the sum (assessed as 50 feet)+ 50Sum of terrain height accuracy figure and sum = 6375 Raise to next higher 100-foot level = 6400 Maximum Elevation Figure (MEF) = 6^{4}

## Natural terrain feature vertical obstruction

The Calculate Max Elevation Figures tool computes maximum elevation figures following this process if it is a natural terrain feature:

- Determine the elevation of the top of the highest natural obstruction.
- Determine the elevation of the highest natural terrain feature at mean sea level, plus the nonrepresented allowance.
- Determine the terrain accuracy figure and add it to the sum.
- Round the resultant figure up to the next higher 100-foot level, if necessary, to achieve a complete value in even hundreds of feet.

### Example

Highest Terrain Elevation above mean sea level = 1510 Nonrepresented allowance+ 200Sum of highest terrain elevation and NRA = 1710 Add a terrain height accuracy figure to the sum (assessed as 50 feet)+ 50Sum of terrain height accuracy figure with highest terrain elevation and NRA = 1760 Raise to the next higher 100-foot level = 1800 Maximum Elevation Figure (MEF) = 1^{8}