Observation Viewer Guide

Table of Contents:

To Begin

Other Viewer Options

Error Messages


To Begin

Check box for desired station types and zoom in to desired location.

Click on station of interest on map. A window will pop up with photo of station if available. The Viewer will display information for Station Info tab. Information about the station such as the station name,last data update date, the height of mounted sensors, station affiliation or owner, longitude, latitude and elevation will be displayed. if the cloud on the map is closed, clicking on the row named "Station Name" will re-populate the cloud dialog.

A station must be selected by clicking the icon on the map in order to view data.

Double click on some rows, such as "Last Update" or "Air Temp Height", to conert measurement units and timezone.


From this point you have a few options for discovering data:

1. Click on the Available Data tab and highlight the data type you are interested in. This will open a chart at the bottom of your screen that will allow you to view the data in the following ways:

  • Select chart view or table view on the toolbar (See the picture below) In chart view, you are also able to expand or condense your view of the time period using the scroll bar at the bottom of the chart. Holding your cursor over the line in the graph will allow you to view measurements at smaller time increments in the top right corner of the chart.

  • Hold ctrl/shift and mouse click to pick multiple measurements and display them on one chart or one table.
  • Select time period up to 7 days prior
  • Select unit of measurements: Metric or English
  • Select time zone

The default time zone is GMT and measurement units are metric, but this can be changed using the drop-down boxes at the top of the form.


2. Click on the View More Data button at the bottom of the viewer:

This will open a new tab/page in your browser that will allow you to view:

  • More information about the station
  • Data in a sort-able table that displays daily time periods of all data parameters monitored by the station
  • Data in a chart view that is able to display up to a 30 day time period and can compare some data types

3. Click on the Subscribe to Data button at the bottom of the viewer:

This will open a new window which will allow you to subscribe to an RSS feed for real-time data from the station of interest. Follow instructions to select desired time zone and measurement unit. You can send the subscription to your favorite reader (ex. GoogleReader) or create an RSS bookmark for your browser.


Other Viewer Options

Record of the Day

Select the Record of the Day tab at the top of the viewer to view the record for air temperature, water temperature, wind gusts, and wave height reported in the last 24 hours. If there is no record available, it means no data are reported for the measurement in the last 24 hours.

To view the record of the day, first check the box for the record you would like to see. An icon will appear on the map. Select the icon. A small window will appear in the map displaying the name of the station, the recorded observation and the time and date the observation was made. The viewer will display the station information in the Station Info tab.

Search Station

If you already have a specific station or data parameter in mind, you can use this feature to search for that information. To start, select the Search Station tab at the top of the viewer. Enter in the keyword or parameter in the appropriate box. Click the "Search" button. Results for the search will appear in the viewer map. Once you have completed your search, you can clear the results by clicking the "Clear Search Results" link.

Ship Report

Several commercial, naval and other types of ships collect observations of a variety of data parameters as they navigate throughout the Great Lakes. Some of this data is made available to GLOS and can be accessed in this section of the viewer.

To start, select the Ship Report tab at the top of the viewer. Select the ship you wish to see data for.

The list only displays ships that have reports in the last 48 hours. A table view of the data reported from the selected ship will appear in the bottom of the viewer.
The table only displays data reported from the ship, which can vary in terms of data parameters and time periods. The default time zone is GMT and measurement units are metric, but this can be changed using the drop-down boxes at the top of the form. The view cannot be changed to a chart.

Error Messages

No data available in last ?? hours or time series for multiple variables don't exactly match

When you click on one/multiple measurement from the Available Data tag, a quick view will be displayed in either tabular format or chart format for the last 48 hours by default. If you see this message, it means that there is no data for this particular measurement in this time frame. Please adjuct the time frame through the dropdown list named "Last" on the toolbar. If you still can not get any data view even you enlarge it to 1 week, it probably means that this station has not reported data for this measurement in the last week. You could verify the last update date time on the Station Info tag, row names "Last Update".

Chart View can not be applied on ship report

This error occurs if user tries to select a chart view onto a data series reported from a ship. Due to the reason that ships usually collect observation data while they are on the move, the data ships reported are actually instantaneous. Since the location (lat/lon) varies record by record for ship report (most cases), the chart with the regular x,y axes (time/value) are not appropriate to depict this kind of data. Please use the tabular form to view data.