# Adjust the vertical exaggeration of your model in Surfer

By default, Surfer creates 3D surface maps with a 1.5 inch Z axis, regardless of the scale. Any vertical exaggeration in the Z direction is due to this fixed default. To adjust the Z scale (vertical exaggeration), follow the steps below.

- Select the
*Map*in the**Contents**window. - Click the
**Scale**tab in the**Properties**window. - In the
*Z Scale*section, adjust the*Length (page units)*or*Map units per inch*to the desired value. Setting the*Map units per inch*for the*Z Scale*to match that of the*X Scale*and*Y Scale*will result in a vertical exaggeration of 0.

## Assign a scale of 1:1 (vertical exaggeration=1) in the 3D view when the Z units are different from XY units In Surfer

The vertical exaggeration setting in the 3D view assumes the X, Y and Z units are in the same units. When this is the case, a vertical exaggeration of 1 will display with true vertical scaling.

However, this is not the case when the Z units are different than the XY units (for example, when the XY coordinates are lat/lon and Z units are feet). In these cases, some math is needed to calculate the appropriate vertical exaggeration value to enter to show no vertical exaggeration. Divide 1 by the conversion factor to determine the value for which there is no vertical exaggeration.

For examples:

**If XY is in meters and Z is in feet:**

- 1m = 3.2808’
- 1/3.2808 = 0.3048
- A vertical exaggeration of 0.3048 will show no vertical exaggeration.

**If XY is in feet and Z is in meters:**

- 1’ = 0.3048m
- 1/0.3048 = 3.2808
- A vertical exaggeration of 3.2808 will show no vertical exaggeration.

**If XY is in lat/lon and Z is in meters:**

- 1° = 111300 * cos (central latitude)
- Find 1/(111300*cos(lat))
- A vertical exaggeration of the above result will show no vertical exaggeration.
- For example, if the central latitude is 39.5°, then set the vertical exaggeration to 0.000011644 (1.1644e-5) to show no vertical exaggeration.

**If XY is in lat/lon and Z is in feet:**

- 1° = 365228 * cos (central latitude)
- Find 1/(365228*cos(lat))
- A vertical exaggeration of the above result will show no vertical exaggeration.
- For example, if the central latitude is 39.5°, then set the vertical exaggeration to 0.00000354838 (3.54838e-6) to show no vertical exaggeration

*Updated November, 2021*

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