This page describes the panel Multi-Plot. The plots provided on this panel are helpful for studying the convergence behavior and the coordinate accuracy of the PPP solutions. They only make sense for multiple observation files (or processings) and/or a numerous resets of the solution. For example, you could process a daily file with a reset each hour and then create meaningful multi-plots.
The Multi-Plot Table contains all processings which might be included in the creation of the next plot. To create multi-plots, this table needs content. Rows with the same label (last column, corresponding to the processing name) are merged together. Some plots are opened for each label and other plots contain all labels in direct comparison to each other. To delete a row, click into the field station, delete its content, and hit the enter button. You can control the manipulation of the Multi-Plot-Table using the checkboxes directly below.
... same station: Manipulates all cells with the same station. Enable this checkbox if you want to manipulate something in the Multi-Plot-Table in all rows with the same station name (e.g., change the true x-coordinate, delete all processing for a specific station)
... same label: Manipulates all cells having the same label. Enable this checkbox if you want to manipulate something in the Multi-Plot-Table in all rows with the same label (e.g., changing the label name).
… identical: If this checkbox is enabled and you change a cell, all cells in this column with the same value will be changed to the same new value.
... all: Manipulates all cells in this row. This is not possible for the columns ‘path’ or ‘station’.
Add Folder: This will open a window where you can select a folder. All processings located in this folder and its subfolders will be added to the Multi-Plot-Table.
Add Last: Add the last (single file) processing to the Multi-Plot-Table.
Delete all: This empties the Multi-Plot-Table.
Load plot list: Use this button to load a previously saved Multi-Plot-Table. The loaded rows are appended to the existing content.
Save plot list: Use this button to save the current content of the Multi-Plot-Table as *.mat-file. Later, you can load it back into the Multi-Plot-Table.
Horizontal Convergence Plot: This plot shows the horizontal position error of all convergence periods over time. For each label, a new window and plot are created. Additionally, the median, the 0.68-quantile, and the 0.95-quantile are plotted depending on the number of convergence periods.
Coordinate Convergence Plot: This opens a figure with three subplots for the North, East, and height component for each label. Each subplot shows the coordinate error over time of all convergence periods. Additionally, the median is plotted as a black line. Furthermore, a histogram of the coordinate difference is plotted for all epochs.
Coordinate Accuracy Plot (removed in Oct 2023): This opens a plot for each label, allowing an interpretation of the coordinate accuracy.
Convergence/Accuracy Plot: This plot shows the 3D position accuracy (defined with the last point in time) plotted over the convergence time (2D convergence criteria). Furthermore, the corresponding distributions are shown allowing us to assess if there is a difference in the convergence behavior or final accuracy of various PPP solutions. Please note that this plot only works for equally spaced convergence periods and a correctly defined last point in time (e.g., reset of the solution every 30 or 60 minutes).
Box Plot: Creates a single plot for all labels showing a statistical Box Plot for the 2D convergence. With this plot, you can easily compare the convergence of different labels.
Time to First Fix Plot: Opens a single figure with two subplots, each containing the data from all labels of the Multi-Plot-Table. The upper one shows when the first fixed position is achieved, and the lower one when the first correct fix is achieved.
Histogram of Convergence Plot: Opens a window for each label showing the accumulated amount of convergence periods that have reached convergence.
ZTD Convergence: Plot the convergence periods of the zenith total delay with respect to the IGS estimation. Note that this plot does only for IGS stations with Tropo-file (automatic download is tried).
Bar Plot of Convergence: Opens one figure for all labels. The subplots show for the coordinate's differences and position differences how many percent of the convergence periods have reached convergence at specific points in time.
Station Results: This opens two plots for each label in the Multi-Plot-table. The stations are color-coded points on a world map. The color of a station depends on the accuracy of this station (95% quantile of all epochs) or the convergence of all convergence periods of this station (float solution: mean time until 3D convergence, fixed solution: mean time until correct fix). Therefore, this plot enables a check if specific stations deliver worse results.
Station Graph: This opens a figure with two subplots. The upper panel shows the mean convergence time (float solution: mean time until 3D convergence, fixed solution: mean time until correct fix). The lower panel shows the 95% quantile of all epochs. For each label, the values of all stations are plotted in a specific color. Therefore, this plot enables a comparison of different PPP solutions (settings) for the same stations.
In the provided textfield you can define the points in time which are used for specific Multi-Plots (e.g., bar plot of convergence). You can enter any amount of points in time, but make sure they are separated by a minus ('-').
Some plots need convergence thresholds defined here. A convergence period (the epochs between two resets) has reached convergence when it is under the defined threshold and stays there for the remaining convergence period. As different thresholds are useful for plots of the float and the fixed position, the values will automatically change when changing the solution (float or fixed) to plot.
Decide if the results of the float or the fixed solution are plotted. Selecting the fixed solution enables the Time to First Fix Plot. Changing from float to fixed or the other way around will change the defined values of convergence.
Hitting this button will start the creation of Multi-Plots. This might take some time depending on the number of rows in the Multi-Plot-Table because the data needs to be read-in and stacked.
Plot each row: Enable this checkbox to add the number of the row to the beginning of each row's label. As a consequence, Multi-Plots will be created for each row useful, for example, to check for processings with bad convergence behavior.
Plot each station: Enabling this checkbox will create the plots for each station.
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