Install and start CoordTrans Install and uninstall How to install and uninstall CoordTrans. After downloading and installing CoordTrans take a look at this page for updates: Grid and datums updates for CoordTrans License key How to purchase a license and use the license key.

	Convert one single coordinate Datum to Grid, Longitude/Latitude <-> Easting/Northing This example demonstrates WGS84 to Texas North (NAD83), but you follow the same steps to between WGS84 and UTM, WGS84 and British National Grid, etc. Grid to Grid, Easting/Northing <-> Easting/Northing This example demonstrates RT90 2.5gonV to UTM, but you follow the same steps to convert between State Plane Coordinate System (NAD83/NAD27) and UTM, UTM and British National Grid, etc. Datum to Datum, Longitude/Latitude <-> Longitude/Latitude This example demonstrates WGS84 to OSGB36, but the steps are identical for conversion between all datums.

	Convert coordinates from file Batch conversion from file How to convert a batch of coordinates from a file. Coordinate Formats Advanced! How to define your own file input and output formats.

	Manage grids and datums Supported countries, states, grids and datums Datum and grids that are already included in CoordTrans. You can also define your own grids and datums - see below. Managing the Grids Advanced! How to create and edit grids (projections). Managing the Datums Advanced! How to create and edit datums.

Example how to convert coordinates between longitude/latitude and easting/northing. WGS84 to Texas North(NAD83) is used as example.

1.	Make sure Longitude/Latitude is selected in the upper left corner. Select the datum to convert from by clicking . Browse to The Earth and select WGS84. And click OK. Or you can simply write WGS84 in the "Find" box to search for a datum by name.
2.	Enter a coordinate to convert from WGS84 to Texas North. You can enter the coordinate in either Degrees/Minutes/Seconds (DMS), Degrees/Minutes (DM) or Decimal Degrees by clicking the appropriate radio button under the coordinate. You can also click on either the left-most map or the middle map. To read a position from a GPS click "Read position from GPS". (GpsGate must be installed for this feature.)
3.	Make sure Easting/Northing is selected in the upper right corner. Next select the output grid by clicking in the right pane. Again, you will need to browse to the appropriate region and select the grid. Texas North is available in the state of Texas/United States, which you can locate by clicking "The Earth -> America -> North America -> United States -> Texas". Here you'll see Texas North available in several versions, sorted by the datum onto which the grid is projected. In this example, select "NAD83 -> Texas North". And click OK. Or you can simply write "Texas North" in the "Find" box to search for a grid by name.
4.	WGS84 is now selected on the left side, and Texas North on the right. Click the right-arrow button or click F12 to convert the coordinate. To convert from Texas North to WGS84, just click the left-arrow button or F11.

Note: If the CoordTrans makes a warning when you select a grid it is because the currently selected grid is not compatible with the newly selected grid. This is because there is no transformation available between the datums onto which the grids are projected. To resolve this, you will have to enable datum transformations - see Managing the Datums - on the source and/or destination datums.

Example how to convert coordinates between grids. Swedish Grid to UTM is used as and example here. The steps are identical to convert State Plane Coordinate System (NAD83/NAD27) to UTM. Or British Grid to UTM, etc...

1.	Make sure Easting/Northing is selected in the upper left corner. Select the grid to convert from by clicking . Browse to "The Earth->Europe->Sweden" and select RT90 2.5gonV. And click "OK". Or you can simply write RT90 in the "Find" box to search for a grid by name.
2.	Enter a coordinate to convert from RT90 2.5gonV to UTM. Since this is a grid, you must enter Easting and Northing in the boxes. You can also click on either the left-most map or the middle map. To read a position from a GPS click "Read position from GPS". (GpsGate must be installed for this feature.)
3.	Make sure Easting/Northing is selected in the upper right corner. Select the grid to convert to by clicking in the right pane. Again, you will need to browse to the appropriate region and select the grid. UTM is an international coordinate system, but you must select a local zone. In this example, we will convert to UTM Zone 32N which is available in Sweden. Or you can simply write 32N in the "Find" box to search for a grid by name.
4.	Finally, click the right-arrow button or click F12! To convert from UTM to RT90, just click the left-arrow button or F11.

Note: If the CoordTrans makes a warning when you select a grid it is because the currently selected grid is not compatible with the newly selected grid. This is because there is no transformation available between the datums onto which the grids are projected. To resolve this, you will have to enable datum transformations - see Managing the Datums - on the source and/or destination datums.

Example on how to convert a position between different datums. WGS84 to OSGB36 used as example here.

1.	Make sure Longitude/Latitude is selected in the upper left corner. Select the datum to convert from by clicking . In this example, WGS84 is the source coordinate system, so we'll have to browse to the region in which WGS84 is available. Browse to "The Earth" -> and select WGS84. Finally, click ok.
2.	Make sure Longitude/Latitude is selected in the upper right corner. Next select the datum to convert to by clicking in the right pane. Again, you will need to browse to the appropriate region and select the grid. OSGB36 is available in the United Kingdom, which you can locate by clicking "The Earth -> Europe -> United Kingdom".
3.	Enter a coordinate to convert from WGS84 to OSGB36. You can enter the coordinate in either Degrees/Minutes/Seconds (DMS), Degrees/Minutes (DM) or Decimal Degrees by clicking the appropriate radio button under the coordinate. You can also click on either the left-most map or the middle map to receive a coordinate, or click on "Get From GPS" to get a coordinate from GpsGate.
5.	Finally, click the right-arrow button or click F12! To convert from OSGB36 to WGS84, just click the left-arrow button or F11.

CoordTrans can convert coordinates in one text file and store it to a new text file. If you have your coordinates in Access, Excel or some other format, export them to a (csv) text file first. Then run CoordTrans to make the conversion. And finally import the new generated text file back to the original program.

Save and Load settings

If you have set up a conversion that you use often or plan to use in the future, you can save the settings. To do this, set up the conversion as instructed above, select "File->Save Settings" and select a file where the conversion should be saved. The saved conversion is independent from the application configuration, i.e. all coordinate formats and coordinate systems are stored in the file. This means that you can load conversions even though you don't have the coordinate formats or the coordinate systems defined in your own application.

Command Line

If you do batch conversions frequently, you might want to automize the conversion procedure. In CoordTrans v2.0 it is possible to do batch conversions from the command line using an input file, an output file and a saved batch conversion settings file. To use the command line, first save a batch conversion settings file - using the instructions above - and then execute the conversion by writing

CoordTrans [settings-file] [input-file] [output-file]

CoordTrans WGS84_To_UTM32N WGS84_Coordinates.txt UTM34N_Coordinates.txt

One of the new features in CoordTrans v2.0 is that you can manage a large database of grids and datums. This section shows how you can import, export, remove and create new grids that you can use in your conversions.

You can find the grid manager by clicking "Manage Grids" under the Tools-menu in the main display (see figure 1). This will show you a dialog similiar to the dialog where you select a grid for conversion, with the addition of some input fields. When you select a grid, the fields will be populated and you can edit the grid as you wish.

Figure 1 - finding the grid manager

Creating a grid

To create a new grid you can either create a new grid from scratch or clone an existing grid and use that as a base. To create a new grid from scratch, simple navigate to a region of your choice and right click an appropriate datum. This will display a menu with a single option "Add Grid". If you click a new grid will be created (see figure 2). To clone an existing grid, right click the grid and select "Clone". This will create an identical copy of the grid that you can change without altering the original grid.

Figure 2 - adding a grid

To alter a grid, first select it and then edit the parameters you whish to change. Once you are satisfied with the alteration, click "Save" to save the changes. Note that one grid can be associated with several regions! If you change the parameters of a grid, they will be applied to all regions. If you wish to make a change specific to a region, clone the grid and change that instead.

To remove a grid, simply right click it and select remove. If you click remove while a region is selected, the grid will simply be dissassociated with the selected region. However, if you remove a grid that you have found through the search box, or if you remove a grid that is available under the "Unspecified" category, the grid will be removed completely from the database.

Figure 3 - removing a grid

If you wish your grid to be accessible in another region, just drag the grid from the grid list and drop it on the region in which it should be accessible. This will associate the grid with a new region, i.e. if you change the grid in one region, it will change in the other as well.

If you create or alter grids you can save the grids into a file that can be imported into CoordTrans. Thus, it is possible to e.g. make backups of the grids you create or send grids between computers. To export a grid, simple right click it and choose export (See figure 4). If you want several grids in one file, choose an existing file and then choose merge. This will add the grid to the file instead of e.g. overwriting it. By doing this, you can maintain your own database of grids that you can distribute. When you import a grid, the grid will be compared to those in the database. If the grid being imported already exists, it will be compared to the existing. You can then choose to ignore the grid or overwrite the existing grid.

Figure 4 - exporting a grid

If you don't know where your grid is, you can always search for it in the find-box (see figure 5). To search for a grid, simple enter part of its name, its ESRI number, the datum it is based on, a zone etc to search through the database. Note that when you search for a grid, you don't associate the selection with a region. This means that if you remove a grid you have found from a search, it will be completely removed from the database.

Figure 5 - searching the database for a grid

One of the new features in CoordTrans v2.0 is that you can manage a large database of grids and datums. This section shows how you can import, export, remove and create new datums that you can use in your conversions.

You can find the datum manager by clicking "Datums" under the Tools-menu in the main display (see figure 1). This will show you a dialog similiar to the dialog where you select a datum for conversion, with the addition of some input fields. When you select a datum, the fields will be populated and you can edit the datum as you wish.

Figure 1 - finding the datum manager

Each datum available for selection is actually a class of datums, i.e. each selectable datum branches out into several datums. The common denominator is the ellipsoid - it is the transformation to WGS84 that differs between the variants of the datums. Each variant encapsulates a parameter set for conversion to WGS84, and a transformation is required for a conversion to take place. The variant that is used when converting is the one set to default in a particular region. You can change this by clicking the Default in [region] button in the variant field of the datum manager. See figure 2.

Figure 2 - selecting a datum variant

Some datums in the database, such as RT38 (Stockholm), does not have any transformation to WGS84 associated with them. For this reason, you cannot transform coordinates given in RT38 (Stockholm) - or any of the grids based on RT38 (Stockholm) - to another datum. To enable transformations, you need to add or modify a datum variant and mark it enabled for transformations. To do that, check "Datum transformations enabled" (see figure 3) and fill out the parameters. Once you have done this, you can use the datum as any other datum.

Figure 3 - enabling transformations on a datum

Every datum available in the database and the datums you create can be exported so that it can be imported later or on another machine. To export a datum, simply select it and click export. If you select an existing file you are given the option to merge the datum into the file, which means that you can create a database containing several datums and/or grids and/or coordinate formats. See figure 4.

To import a datum you simply click import and select the file that contains the datums. The datums will be imported and sorted according to the regions they are associated with in the file being imported. If a datum being imported already exists in the database you are given the option to overwrite the existing datum if it differs from the one being imported.

Figure 4 - exporting a datum

If you wish your datum(s) to be accessible in another region, just drag the datum(s) from the datum list and drop it/them on the region in which it should be accessible. This will associate the datum(s) with a new region, i.e. if you change the datum(s) in one region, it/they will change in the other as well.

If you don't know where your datum is, you can always search for it in the find-box (see figure 5). To search for a datum, simple enter part of its name, ESRI number, reference meridian etc to search through the database. Note that when you search for a datum, you don't associate the selection with a region. This means that if you remove a datum you have found from a search, it will be completely removed from the database.

Figure 5 - searching the database for a datum

Coordinate formats allow you to define exactly how the coordinates in a file should be represented. When you perform a batch conversion, you first define how the input coordinates are define. This is necessary since CoordTrans needs to be able to understand the coordinates in the file. Once understood, CoordTrans can write the coordinates to a destination file using another coordinate format. Thus, you can choose to represent your coordinates in any way you like!

Managing the Coordinate Formats

CoordTrans maintains a database of coordinate formats that you can edit as you wish. By selecting Tools->Coordinate Formats in the batch converter dialog, you reach a coordinate format manager. Here you can create, edit, remove, import and export coordinate formats.

Figure 1 - managing the coordinate formats

Creating a new coordinate format

There are two ways to create a new format - you can create a coordinate format from scratch or you can base your new coordinate format on an existing format. To create a coordinate format from scratch, you simple click new and fill out the fields. To base your format on an existing format, you need to clone the existing formats. To do this, simply select the existing format, right click it an select clone. Now you have an identical copy of the coordinate format which you can alter without editing the existing format!

Defining a Coordinate Format

A Coordinate Format can be defined in two ways; either using a simple coordinate format expression or a regular expression. The simple expression will generate a regular expression, so it is possible to start with a simple expression and refine it by altering the regular expression.

The fastest way to define a coordinate format is to use a simple expression, which is composed of the letters D, M and S. Uppercase characters represent the integer part and lowercase characters represent the decimal part. Thus, D represents the integer part of degrees (i.e. 90 if degrees is 90.56) and d represents the decimal part (i.e. 56 if degrees is 90.56).

Input and Output

Coordinate formats can be used both to interpret a coordinate read from a text file, and to format a coordinate so it can be written to the text file. However, different rules apply to input and output coordinate formats. The distinctions are:

Examples

D° MM' SS.s"

D° MM' SS(.s)"

1.	First you need to purchase a license key. You will have the key delivered to you by email directly after the purchase. You can make the purchase here.
2.	Start CoordTrans. If your trial period has expired you will have the dialog below displayed to you. If your trial period has not expired, select File->Enter License Key from the CoordTrans menu.
3.	Cut'n paste your email address and the license key you received by email after your purchase. Then press OK.
4.	License key is now installed! If you have purchased a site license repeat step 2 and 3 on each user's computer that should use CoordTrans.