Search the data

Argo

Using the Argo interactive maps

Three examples of map display
Three examples of map display ©

Follow the links below for information on how to navigate and use the interactive map to display objects (features) and access temperature and salinity profile data.

  1. About the Argo interactive maps
  2. Screen layout and functionality

3. Profile plots (UK floats only)

4. How to access and request UK floats temperature and salinity data

5. How to access Southern Ocean temperature and salinity data

1. About the Argo interactive maps

BODC has created interactive maps to display information about Argo floats deployed by the UK or in Southern Ocean and to allow you to obtain the data collected.

You can display objects on the map (features) from the following data set layers

  • floats' last position
  • float deployment location
  • float trajectories — the history of the previous positions of the float

As additional information is stored with the data you can

  • find the float identification number
  • find the last profile date and position

before submitting your request for the data.

To help you navigate the map and to put the float and trajectory data into geographic context we have included map layers such as the 2000 m bathymetric contour.

2. Screen layout and functionality

An illustration of the UK Argo interactive map developed at BODC
An illustration of the UK Argo interactive map developed at BODC ©

Map frame

The area in which the map is displayed.

Layers list

The list of data set layers available to be displayed in the map frame, together with visible and active buttons which may be toggled on and off.

  • Toggle the visible button to select which of the layers are to be displayed in the map frame. You can select more than one layer for display.
  • Toggle the active button to select which of the layers can be queried or data selected using the tools on the toolbar. Only one layer can be 'active' at any one time.

When you have made or changed your selection click the refresh map button at the end of the list to redraw the map with the new selection.

The defaults are

  • UK floats —'Active Apex' and 'Active Provor' are set as visible layers and 'Active Apex' is set to be the active layer.
  • Southern Ocean floats — 'Last position (active)' is set as the visible and active layer.

Please note that if you re-size the browser window then the map is reset to these defaults.

Additional buttons

These buttons are found below the layers list (scroll if necessary).

Refresh map button      Refresh map — redraws the map with the current selection. You need to do this when you have made a change to your selection of visible layers or changed the active layer.
Help button     Help — accesses this help information.

Toolbar

Toolbar
Toolbar ©

Use these tools to navigate around the map frame. Select the floats and/or trajectories that you want to find out more information about and/or access data from.

Display | Zoom | Pan | Query | Selection

Display

Legend icon Overview map icon Set units icon
Click on the icon to make it active
Legend icon Toggle between the legend display and the layers list.
The legend shows the symbols used to display items in the map frame.
Overview map icon Toggle the overview map on and off.
Set units icon Set the units used for displaying the map scale (shown at the bottom of the map frame).
Select the units you want to use from the list (feet, miles, metres or kilometres). Having made your selection click the set units button to confirm. The units are used with the measure and buffer tools.

Zoom

Zoom in icon Zoom out icon Zoom to full extent icon Zoom to active layer icon Zoom to previous extent icon
These tools let you zoom in and out of the map display area. Click on the icon to make it active.

Zoom in icon Zoom in — zoom into an area on the map frame, by either
  • Left clicking the mouse on a single point on the map. A new map is displayed, zoomed in and centered on the chosen point.
  • Clicking and dragging a rectangular box around the area you're interested in. A new map with a larger scale will be displayed.
Zoom out icon Zoom out — click or drag a rectangle on the map to zoom out.
Zoom to full extent icon Zoom to full extent — zoom out to the full geographic extent of the map.
Zoom to active layer icon Zoom to active layer — zoom to the geographic extent of the features in the active layer. This is the layer that has been chosen from the layers list.
Zoom to previous extent icon Previous extent — returns you to your last chosen map extent.

Pan

Pan icon Pan to north icon Pan to south icon Pan to west layer icon Pan to east extent icon

>These tools let you move the viewing window up, down or sideways to see a part of the map which is outside the current display area while remaining at the current viewing scale. Click on the icon to make it active.

Pan icon Click in the map frame and drag the cursor to pan to another part of the map that is outside the current view.
Pan to north icon Pan to north.
Pan to south icon Pan to south.
Pan to west icon Pan to west.
Pan to east icon Pan to east.

Query

Identify icon Query icon Measure icon Find icon

These tools allow you to find out information about the data in the active layer and to search for features from this layer based on their properties and/or location.

If the query is successful then information about the feature is displayed in the information table below the map frame. Further information about the float and trajectory properties are provided on the Argo floats page.

Click on the icon to make it active.

Identify icon Identify — find out information about features from the active layer. Click on a feature of interest from the active layer in the map frame. Information about the feature is displayed in the information table below the map frame.
Query icon Query — define how you want to search for data from the active layer using the Query builder dialogue box.
Measure icon

Measure — measures the distance between user defined points in the map frame. The distance is displayed in map units which can be set using the set units tool.

In the map frame, click on the start of the line segment you want to measure, then move the cursor to the next point in the line. At the top of the screen the distance travelled in the line segment is shown. Click once to drop a point and start a new segment of the line. Notice that the line segment is shown in red in the map frame. When you reach the last point in the line then double click the left mouse button. The total distance travelled along the line is shown in the left-hand box at the top of the map frame.

Find icon Find — find features using the Find dialogue box based on the properties of the active layer. You can only search on text strings.

Selection

Select by rectangle icon Select by line/polygon icon Clear selection icon Buffer icon

These tools allow you to select features based on their geographic location. Once selected, information about the features can be viewed in the table below the map frame.

Click on the icon to make it active.

Select by rectangle icon

Select by rectangle — define a rectangle that encloses the features that you are interested in.

Click on the map to define the position of one corner of the rectangle then drag the cursor to define the opposite corner of the rectangle and release the button. The selected features from the active layer are now selected and displayed in yellow within the map display. Information about the features is displayed in the table below the map frame.

Select by line/polygon icon Select by line/polygon — select features, using the Select with line or polygon dialogue box, that fall along a user-defined line or within a user-defined polygon
Clear selection icon Clear selection — Use this tool to clear the current selection.
Buffer icon

Buffer — create, using the Buffer dialogue box, a user-defined area or buffer around the currently selected features.

Before you can use this tool you must first select features using either the select by line/polygon, select by rectangle or query tools.

Dialogue boxes

Query builder | Find | Select with line or polygon | Buffer

Query builder dialogue box
Query icon
Query builder dialogue box
Query builder dialogue box ©

Use this dialogue box to build a query to search for features from the active layer which have certain properties or fall within certain defined limits.

  • Field — select the property to be used to define your search.
  • Operator — select the mathematical operator to use when building your query.
  • To search for a particular value use the '=' operator.
    For example Float = Apex to search for Apex floats.
  • Use the <,>, <=, >= and <> operators to compare values.
    For example, latitude > -50.0 to search for floats that are located at a latitude greater than 50 degrees south.
  • Value — select the property to use in your query. You can see a range of sample values that you can use for your search by clicking the Get Samples button. You can also enter your own values.
  • Get samples — this gives you a sample of all the values that exist. The list is not comprehensive. You can build your own query, selecting your own values to use in the value column for the search.
  • Add to query string — when you have built your query by selecting a field to search on, an operator and a value, use this to create your query.

You can build a query with more than one criteria by using the And, Or, Not, (, ) operators. For example, Type = 'Webb Apex' AND Date = '2005-02-22 06:26:14'. This will search for Webb Apex floats from the Active Apex layer with last profile date of 2005-02-22 06:26:14.

  • Execute — clicking this button carries out the query
  • Undo — this deletes the last part of the query you have been building
  • Clear — clears the whole query
Find dialogue box
Find icon
Find dialogue box
Find dialogue box ©

Enter the text string you want to search for in the Enter String to Find in layer box and then click Find String to carry out the search. The search is case-sensitive. The search is done on all fields within the active layer.

For example, you could enter the word ACTIVE in the box to find all floats which have fields that contain the word 'ACTIVE' in them.

Select with line or polygon dialogue box
Select by line/polygon icon
Select with line or polygon dialogue box
Select with line or polygon dialogue box ©

To select features along a user-defined line, click in the map to anchor the starting point of the line and then move the cursor to the position of the next point along the line and click again. The line can have multiple points. Click on the Complete line & select button to finish off the line and select any features from the active layer that are crossed by it.

To select features within a user-defined polygon, click in the map to anchor the starting point of the polygon and then move the cursor and click to define the corners of the polygon. Click on the Complete polygon & select button to finish off the polygon and select any features from the active layer that fall within it.

Any features from the active layer which are crossed by the line or enclosed by the polygon are now selected. They are displayed as yellow dots in the map frame and information about the features is displayed in the information table below the map frame.

Use the Delete last button to get rid of any unwanted points during line or polygon construction. Use the Restart button to clear the current line or polygon under construction so that you can start again.

Buffer dialogue box
Buffer icon
Buffer dialogue box
Buffer dialogue box ©

Use this dialogue box to draw a buffer around the currently selected features and/or select features from another layer which fall within the buffer zone of the currently selected features.

The highlight features from list lets you choose the layer that you want to select features from if they fall within the buffer zone. To just draw a buffer around the currently selected features then leave this as 'No layer'.

For example, the following dialogue draws a buffer zone around the currently selected features at a distance of 100 miles. The distance is measured in the units defined by the set units tool. The selected features are shown in yellow and the buffer zone in grey.

How to use the buffer tool
How to use the buffer tool ©

If you want to select Active Provor floats that fall within this buffer zone then you would click Active Provor from the highlight features from list. You can then check the Display attributes button to see information about any Active Provor floats which fall within this buffer zone. Any selected floats are displayed as large red circles. This information includes a link to profile plots and from here to the unprocessed ASCII data.

Selecting features that fall within the buffer zone
Selecting features that fall within the buffer zone ©

Overview map

Toggle the overview map display on and off by using the Overview map icon button from the Display section of the toolbar.

This small map, which is displayed in the top-left-hand corner of the map frame, shows a broad overview of the full map frame. The red box shows the geographic extent of the current map display. You may also pan within the map frame by clicking areas in the overview map.

Information table

More information about selected floats is displayed in a table below the map frame. The plot field in the UK floats map information table links to a page showing temperature and salinity profile plots for the float.

When you choose features using the selection tools, a Zoom to these records link is displayed. This link zooms to the geographic extent of the selected floats. The link from the number in the Rec field lets you zoom to the position of that float.

UK floats information table

UK floats information table ©

Southern Ocean floats information table

Southern Ocean floats information table ©

3. Profile plots (UK floats only)

Plots of the last transmitted temperature and salinity profiles are available for each deployed float. In addition, a temperature against salinity plot for that profile and a time series of battery voltage (where available) over the whole lifetime of the float are shown.

To view the profile plots first select the floats that you are interested in from the currently active layer using the query or selection tools from the toolbar.

Information about the selected floats is displayed in the table below the map frame. There is a link from the plot field to the profile plot for the selected float. The link opens up the plot in a new browser window.

4. How to access and request UK floats temperature and salinity data

Temperature and salinity profile data, metadata and trajectory data for the Argo floats deployed by the UK can be obtained using the interactive map.

Technical data are not available by request from BODC. This may be downloaded from the Argo Global Data Centres (Coriolis and USGodae) ftp sites.

Making your selection

Firstly, select the float layer and then select the floats which you want to get data from.

  • To display the floats in the map frame, toggle on the visible button next to the layer's name in the layers list. Next, select one layer to be the active layer by toggling on the active button next to the layer's name in the list. You can only make one layer active at any one time. You will need to refresh the display to view these changes. Click the refresh map button at the end of the layers list.
  • Select the individual floats from the active layer using either the query or selection tools from the toolbar. Use the zoom and pan tools to navigate around the map frame.

Once a selection has been made, the information about the floats is displayed in the information table below the map frame. This table includes a 'Request data' column. Processed netCDF data may be requested by ticking the box in the 'Request data' column. This is further explained below.

Requesting processed data in netCDF

In the table of information for the selected floats there is a column labelled 'Request data'. You can choose to request data from all selected floats by checking the all button or choose floats individually by ticking the box. To cancel your selection click the none button.

Having made your selection, go to the Request form (below the layers list).

Use the Request form to select the start date and end date you are interested in and choose metadata, profile and/or trajectory data. Once you have made your selection click on submit. To cancel the selection and start again, select reset.

Having submitted your request you will be sent to the summary report to verify your request.

Once you are happy with your selection, enter your email address in the box provided.

If you have already registered as a BODC web user you will be provided with information about the status of your request. If not, we will redirect you to an electronic registration form as you need to be registered to request these data via our web site. Simply provide a few details and you will be able to proceed with your request.

Your request will be handled automatically. You will be notified via email and asked to collect your data from our ftp site. Clear instructions will be provided.

5. How to access Southern Ocean temperature and salinity data

Data from Southern Ocean floats are not held at BODC. Our interactive map provides a link to access data from the Global Data Centres (Coriolis and US Godae).

Making your selection

Firstly, select the float layer and then select the floats which you want to get data from.

  • To display the floats in the map frame, toggle on the visible button next to the layer's name in the layers list. Next, select one layer to be the active layer by toggling on the active button next to the layer's name in the list. You can only make one layer active at any one time. You will need to refresh the display to view these changes. Click the refresh map button at the end of the layers list.
  • Select the individual floats from the active layer using either the query or selection tools from the toolbar. Use the zoom and pan tools to navigate around the map frame.

Once a selection has been made, information about the floats is displayed in the information table below the map frame. Follow the links provided to one of the mirrored Argo Global Data Centre ftp sites

  • Coriolis ("DOWNLOAD DATA FROM IFREMER")
  • US Godae ("DOWNLOAD DATA FROM USGODAE")

 


Related Argo pages at BODC

Argo contents      UK floats
Introduction     Southern Ocean Argo Regional Centre
Project overview     Meetings
BODC's role     Other links

Related external links

ESRI     International Argo portal
Argo