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GPS Mapping Software - Manage Local Map Grids - Tutorial

Introduction

To open the "Manage Grids" window, select "Options" => "Coordinate Systems" => "Manage Map Grids" from the menu. Using this window, you will be able to view, delete or modify existing grids definitions, or to add your own. For a list of map grids that are already in the database, click here.

click on the image to enlarge

Grid List

When clicking an item in the list, its parameters are displayed below the list. You can edit these parameters by clicking the "Modify" button. The map grid list can be sorted by clicking on the list columns. You can sort the list by country, grid name and geodetic datum used. A map grid definition is displayed by the flag of the country where it applies to. If a grid can be used in multiple countries / regions, instead of a flag, a globe is displayed.

Deleting a grid

You can delete an datum definition, by selecting an item from the list and clicking the button "Delete". The software will show a popup to confirm that you are sure you want to delete. When clicking "Yes" the grid has been deleted.

Modifying a grid

You can modify a grid by clicking the "Modify" button after you selected a grid from the list. After clicking the button, the "OK" button text will change to "Save". Clicking the "Save" button will save the modifications, clicking "Cancel" will keep the old data.

Adding a grid

To add a new grid definition, click the "Add" button. When adding a new definition, it is required to specify a name for this grid, as well as the datum and projection used. Depending on the chosen projection, the input fields are enabled or disabled. The table below shows what fields are required for the different projections:

Selecting a country is not required, but the country can be used to sort lists by country, if the grid does not apply to a simple country, just select "Earth", "Europe", "Asia" etc... When you want to use other units for the Northing and Easting values calculated ( default is Meters ), you can also select the units to be used. Please note that when changing this, you also have to enter the False Northing and False Easting in these units. Units currently supported are:

• Meters
• Kilometers
• International Foot
• British Foot
• Clarke's Foot
• Gold Coast Foot
• Indian Foot
• British Foot (Sears)
• U.S. Survey Foot
• Link
• Clarke's Link
• British Link (Sears)
• U.S. Survey Link
• Statute Mile
• U.S. Survey Mile
• Chain
• Clarke's Chain
• British Chain (Sears)
• U.S. Survey Chain

Click the "Save" button to store the newly created grid, by clicking cancel the input is ignored and you will return to the list.