To set a relative scale of 1:24000 in Surfer, see the steps below.

- In the
**Contents**window, click the*Map*. - In the
**Properties**window, click the**Scale**tab. - In the
*Scaling ratio (1:N)*field, enter the desired scaling factor in map units (24000 in this example).

If you are using Surfer 13 or previous, you'll need to calculate the values to use:

What to enter for the scale entirely depends on what your map X and Y units are. You will need to calculate the scale, and then enter it for the map:

- Calculate the corresponding value for your map units (see below).
- Select
*Map*in the**Object Manager**. - In the
**Property Manager**, click the**Scale**tab. - Enter the calculated X or Y scale value. For example, if you wanted 1:24000 and your map is in feet, you would enter 2000 to the right of
*Map units per in.*for your X or Y scale.

Example Calculations:

- If your map is in units of feet, then a scale of 1:24000 is calculated as follows:

1:24000

1 inch = 24000 inches

1 inch = 2000 feet - If your map is in units of meters, then a scale of 1:24000 is calculated as follows:

1:24000

1 inch = 24000 inches

1 inch = 60960 centimeters

1 inch = 609.60 meters - If your map is in units of lat/long, then a scale of 1:24000 is calculated as follows:

1° of latitude is about 68.703 miles or 4353022 inches.

1 inch = 24000 inches

1 inch = 0.0055° latitude (Y Scale)

1 degree of longitude is 69.172 miles * cos(latitude). This is the same as 4382737.92 inches * cos(latitude). So find the latitude of the center of your map and insert it in the equation to find how much 1° of longitude is for your map. So if your central latitude value is 39.5°:

1° longitude is 4382737.92 inches * cos (39.5)

1° longitude is 3381828 inches.

1 inch = 24000 inches

1 inch = 0.007097° longitude (X Scale)

*Updated February 5, 2017*

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