# Wolfram Language & System 11.0 (2016)|Legacy Documentation

This is documentation for an earlier version of the Wolfram Language.
BUILT-IN WOLFRAM LANGUAGE SYMBOL

# GeoGridLines

GeoGridLines
is an option for GeoGraphics that specifies what parallels and meridians to show.

## DetailsDetails

• The following settings can be given for GeoGridLines:
•  None no geo grid lines drawn Automatic geo grid lines placed automatically n approximate number of parallels and meridians Quantity[…] geo grid lines placed at multiples of an angular quantity {latgrid,longrid} geo grid lines specified separately for latitude and longitude
• With the Automatic setting, geo grid lines are usually placed at points whose coordinates have the minimum number of digits in their decimal representation.
• For each latitude/longitude coordinate, the following grid line options can be given:
•  None no geo grid lines drawn Automatic geo grid line positions chosen automatically n approximate number of parallels and meridians Quantity[…] geo grid lines placed at multiples of an angular quantity {x1,x2,…} geo grid lines drawn at the specified positions {{x1,style1},…} geo grid lines with specified styles func function to be applied to xmin, xmax to get geo grid line option
• When a positive integer n is specified for either latitude or longitude, various heuristics are applied to produce "nice" geo grid lines. As a result, the number of grid lines actually shown may not be exactly n.
• For GeoGridLines->n or , the number of grid lines shown may differ between parallels and meridians.
• For a Quantity specification, only angular quantities are supported.
• The geo grid line function func[xmin,xmax] may return any other geo grid line option.
• AbsoluteOptions can be used to extract explicit lists of latitudes and longitudes that were used for GeoGridLines specifications given Automatic settings.
• Use GeoGridLinesStyle to set styles for geo grid lines.

## ExamplesExamplesopen allclose all

### Basic Examples  (3)Basic Examples  (3)

Overlay a map with geo grid lines using default styling:

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Use the Albers projection:

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Draw geo grid lines at specific lines of latitude and longitude:

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Specify geo grid styles:

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