I
In partnership
with the mining industry, NIOSH developed a software program called EVADE.
This tutorial shows you how to create, save,
and perform a basic exposure assessment using the EVADE software
after you've uploaded your video and logged data onto your computer.
EVADE matches up recorded video and logged data.
The video comes from a worker-mounted camera, as shown here.
The logged data comes from a personal assessment monitor used to measure either dust,
noise, diesel, or chemical exposure.
This tutorial gives you a basic introduction to the EVADE software.
For simplicity, you will create a project using just one video channel
and one logged data channel.
First,
open EVADE from your desktop.
Click the File menu, which is the EVADE icon in the top left corner of the window.
Click New Project.
Now you see a Project Editor window and Bookmarks window, both empty.
You also see a ribbon of icons across the top of the window.
We refer to this menu as the home ribbon.
On the home ribbon, click Add File and then New Channel, which is the only option provided.
After clicking New Channel, you are prompted to add a video or log.
Since you are starting with a video, select Video.
Now you're asked to enter a channel name.
For this demo, we're using Worker 1 Video.
After you name your video, click OK.
File manager opens, prompting you to identify your saved video file.
Locate your file, and then double click to open it.
A video window is now displayed to the right, with the title Worker 1 Video.
You are now ready to add the logged data to the project.
On the home ribbon, click Add File and then New Channel.
This time, click Log.
Enter a channel name.
For this example, enter Worker 1 Dust.
Click the Type of Data menu.
Click the menu to reveal the commands: Generic, Concentration, Light, and Noise.
Since you are performing a dust assessment, click Concentration, and then click OK.
A dialog box prompts you to select an importer for the logged data.
The options in the list are based on the type of data you previously selected.
For this example, click PDR1500.
Next, to select the file to import, click Browse.
The file manager prompts you for your Excel data log file.
Locate and select this file, and then click to open.
Clock OK to close the Add File dialog box.
The Worker 1 Dust window now appears on the screen,
and the Project Editor window now shows the Dust Data channel.
Your video and logged data are loaded into EVADE and ready for use.
Now
that you have created a project, you can save it to open again later.
To save your project, click the File menu, and click Save Project As.
Give it a descriptive name so you can easily return to it as needed.
Once your video and log files are loaded
into EVADE, you can view and interact with the project
to identify time periods of elevated exposure.
Here are a few of the primary software features that you might want
to use in your project assessment.
To play the project, click Play on the home ribbon.
Video and logged data will begin scrolling forward together in real time.
Also, the Play command will change to a Pause command, which you can click
at any time to start and stop the display.
Besides watching in real time, you can scroll forward and backward
in time throughout an EVADE project.
There are three ways do this.
First, use the timeline slider on the home ribbon to move the video and dust data together.
The elapsed time is displayed so you can find a specific moment.
Second, you can click and drag your mouse anywhere in the data log chart
to move the display forward or backward in time.
Third, you can use the Project Editor window.
In this window, the green line represents a specific point
in time of the video and logged data.
Click and drag this arrow to move to a specific point in the project.
Using the Zoom In and Zoom
Out home ribbon icons, you can more easily see specific time segments in your project
where exposure is higher or get a broader assessment of the entire project.
Click within the data log chart to select a specific point
in the project timeline shown on the x-axis.
Next, navigate back up to the home ribbon menu.
You'll see three commands: Zoom In, Zoom Out, and Fit to Window.
Each time that you click Zoom In, you will view a smaller section of time in the data window.
You'll see the data points spreading further apart.
Alternatively, each time you click Zoom Out, you see a larger section of the data.
Last, to see the entire range of the data log in one window, click Fit to Window
for a snapshot of the project's log.
To take a closer look
at exposure levels and identify any elevated peaks, select minimum and maximum values
for the y-axis, which tracks the exposure level for whatever contaminant you are assessing.
Click anywhere in the data log chart window,
and then click the Options command on the home ribbon menu.
A dialog box allows you to set a minimum and maximum y range.
The default selection for the y minimum is Scale All.
Change this to Set Value.
A text box appears where you can enter the minimum exposure value you want the data log
to show.
Leave the value set to 0.
The default selection for the y maximum is also Scale All.
Change this to Set Value.
Type in 500 for the maximum exposure value, and then click OK to exit the dialog box.
These exposure values can be changed at any time,
depending on how you want to view the data.
Next,
you will identify peaks of interest.
One way to identify peaks of interest is to add a specific threshold in the log data window.
This makes it easier to spot higher exposures.
To do this, click Options on the home ribbon, and then click Add Threshold.
Enter a threshold value of 100 micrograms per cubic meter.
Leave red selected as the color of the threshold line.
Click OK. Click OK again to exit the Options dialog box.
Now you see a red horizontal line has been added across the log data window
to help you more easily identify peaks that are above the allowable dust limit.
Another way
to identify high exposures is to use bookmarks.
The most common feature used scans the entire logged dataset and creates bookmarks
in the timeline for the top peak values.
To add bookmarks for the top peaks in your dataset,
click Add Peaks in the Bookmarks group in the home ribbon.
Enter the number of peaks you want to see in the logged data chart.
In this case, leave peaks set to the default value of 5.
Click OK. Two things have happened: First, the Bookmarks window
on the bottom left was populated with the five highest exposure peaks in the current project;
second, these same peaks are also populated in the data log window to the right in red.
The peaks are labeled Worker 1 Dust Peak 1, Peak 2, Peak 3, and so on.
If you click a specific exposure peak in the Bookmarks window, you are taken to the event
that corresponded with that peak.
For example, if you click Worker 1 Dust Peak 1, you are taken to that scenario.
Bookmarks identify the top peak values, and let you easily return
to the events that corresponded to them.
Any changes you make to a project
such as setting exposure values or adding bookmarks should be saved before you exit.
To save you project, click the File menu and then click Save Project.
For further information about EVADE, visit the NIOSH Mining page.