Grid UTM Zone(s)

Use the Grid UTM Zone option (geogxnet.dll(Geosoft.GX.GridUtils.GridUTMZone;Run)*) from the Grid and Image > Utilities menu to calculate the UTM zone(s) of a grid based on its longitude and latitude values. After completing the calculation, a summary report of the UTM zones is displayed.

Grid UTM Zone dialog options

Grid

Select the grid for which you want to calculate the UTM zone(s). The grid must be in the geographic coordinate system (GCS). If the coordinate system (CS) of the grid is undefined (i.e., "*unknown"), the UTM zones are calculated if the CS uses degree units. The longitude values of the grid must range between -180 and 180 degrees, inclusive. The latitude values must range between -90 and 90 degrees, inclusive. If the grid selected does not meet the criteria, a tooltip error message will be displayed next to the field. Script Parameter: GRIDZONE.GRID

Zone | Percentage

The UTM zones for the selected grid and the % of data that falls in each integer zone are calculated and reported: Zone The name of the zone is concatenated using the UTM zone value (which is between 1 and 60) and its corresponding hemisphere designation (N|S). Percentage The % of data, rounded to one decimal place.

Application Notes

The UTM zone values are calculated at the midpoint of cell values across the entire grid using the following equation:

UTM Zone = INT(Longitude/6+31)

The resultant values will be integers in the range of 1 to 60. (The UTM system divides the Earth's surface into 60 longitudinal zones, 6 degrees wide each.)