Set project specific unit options for controlling distance, bearing, height, area, volume and velocity controls.
Home / Tools / Options / Units
An open project.
The following options control the units used for display, entry and reporting of values.
| Basic | Description |
|---|---|
| Angular | Angular unit. |
| Area | Area unit. |
| Linear | Distance unit. |
| Pressure | Pressure unit. |
| Temperature | Temperature unit. |
| Velocity | Design velocity unit. |
| Volumes | Volume unit. |
| Advanced | Description |
|---|---|
| Coordinate Type |
Grid - Easting and Northing in the projects coordinate system. Geodetic - Latitude and Longitude on the projects ellipsoid. The Height is an orthometric height. |
| Coordinate Order |
East / North - Show Easting before Northing. North / East - Show Northing before Easting. X / Y - If you have selected a user coordinate system, show X before Y. Y / X - If you have selected a user coordinate system, show Y before X. |
| Direction Type |
Local Plane - Directions are local bearings. A Local Rotation is applied. Plane - Directions are plane bearings. Grid - Directions are grid bearings. Azimuth - Directions are azimuths. |
| Direction Format |
Whole Circle - Display and input bearings as whole circle bearings. Quadrant - Display and input bearings as angles from the North or South direction. |
| Distance Type |
Grid - Distance corrected for slope, sea level, geoid separation and scale factor. Ellipsoid - Distance corrected for slope, sea level and geoid separation. Ground - Distance corrected for slope only. If a point does not have an elevation then the Default Height is used. Local Plane - A Local Scale Factor is applied. |
| Grade Type |
Percent - Grades as a percentage. Example: 6% is a rise of 6 units over a distance of 100 units. Ratio - Grades as a ratio. Example: 1:10 is a rise of 1 unit over a distance of 10 units. Angle - Grades as an angle. Horizontal = 0° |
| Chainage format |
Chainage - Use the chainage format (distance along the alignment), for labels and chainage text. Station - Use the stationing format (each station represents 100 units.), for labels and chainage text. |
| User Parameters | Description |
|---|---|
| Local Rotation | Click  to select the local rotation to apply to keyed in Local Plane bearings. Plane Bearing = Local Plane Bearing + Local Rotation. |
| Local Scale | Click to select the local scale factor to apply to keyed in Local Plane distances. Grid Distance = Local Plane Distance * Local Scale. |
| User Coordinate System | Click to define, edit or select a user coordinate system to view objects in another reference frame. |
- If you select a plane coordinate system for the project some of the above options will not be available.
- Coordinate order is applicable only when coordinate type is set to Grid.
- For the Angular unit, Sexagesimal, enter values using the format D.MMSS. Example: Enter 35.4532 for 35°45'32".
- For the Angular unit, Degrees Decimal Minutes, enter values using the format DMM.MM. Example: Enter 504.5 for 5°04.5'
- If you select Ground as the Distance Type, ensure the Default Height is set to an appropriate value.
- The Distance Type selected for the project determines the distance used to compute areas.
- If you select a user coordinate system for the project, Coordinate Type, Direction Type and Distance Type will be automatically set to 'Grid', 'Plane' and 'Grid' respectively. The remaining options will not be available.
