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| atmos:citation:research:data_undtoraob:home [2015/09/16 02:53] – bsorenson | atmos:citation:research:data_undtoraob:home [2020/01/29 17:25] (current) – external edit 127.0.0.1 |
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| ===== Use "gunzip" to make the data file readable by cplot2 ===== | ===== Use "gunzip" to make the data file readable by cplot2 ===== |
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| To start, open the terminal and access the flight data in the Aircraft folder. From here, select the date you want to work with and open that folder. In this folder, there should be another folder named PostProcessing. Open that folder and look for a file that ends in ".air.1Hz.gz". This file needs to be fixed so that it can be read by cplot2. To do this, enter the command "gunzip" followed by the file ending in ".air.1Hz.gz". The ".gz" is now removed from the file name, which means it can be read by cplot2. | To start, open the terminal and access the flight data in the Aircraft folder. From here, select the date you want to work with and open that folder. In this folder, there should be another folder named PostProcessing. Open that folder and look for a file that ends in ".air.1Hz.gz". The file should be zipped, so you can unzip it if you like. cplot will plot it either way, but if you want to unzip it, enter the command "gunzip" followed by the file ending in ".air.1Hz.gz". |
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| ===== Use "cplot2" to find the time interval of the ascent/descent ===== | ===== Use "cplot2" to find the time interval of the ascent/descent ===== |
| Enter the command "cplot2" followed by the file name (without ".gz"). A gray window will open up. This window has many options for plotting data on the x and y axes. Click the box next to "time" in the x-axis column and the box next to "Press/alt(m)" in the y-axis column. Once these are selected, click on the "plot" box on the upper menu and hit "Plot xy". This will create a chart showing the altitude on the y-axis and the time on the x-axis. The goal now is to change the time interval so that only the ascent/descent is shown in the chart. | Enter the command "cplot2" followed by the file name (without ".gz"). A gray window will open up. This window has many options for plotting data on the x and y axes. Click the box next to "time" in the x-axis column and the box next to "Press/alt(m)" in the y-axis column. Once these are selected, click on the "plot" box on the upper menu and hit "Plot xy". This will create a chart showing the altitude on the y-axis and the time on the x-axis. The goal now is to change the time interval so that only the ascent/descent is shown in the chart. |
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| To find this time interval, click in the "control" box on the upper menu and hit "time interval". A box will appear with a start time and an end time, both of which are zero. Change the time interval so that just the ascent/descent shows in the chart. Once you have an interval that you think is close, hit enter, click "plot" in the upper menu, and click "plot xy". Repeat this process until only the ascent/descent is shown. | To find this time interval, click in the "tools" box on the upper menu and hit "grab time". Then click and drag the mouse from the left to the right side of the ascent on the graph (it must be left to right. Moving from right to left will not work because the time interval will be backwards and the graph will not plot). Once you do this, a red box should appear over the area that you selected. Click "plot" in the upper menu and "plot xy" in the following menu. This will change the time interval to the selected interval. Repeat this until only the ascent is plotted in the chart. |
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| ===== Use "subset" to make a copy of the data file with the selected time interval ===== | ===== Use "subset" to make a copy of the data file with the selected time interval ===== |
