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Components of spatial display
Spatial Display
The Spatial Display grid display can be used to display show time series of any typekind: scalar, polygon, or grid (see the figures below for examples). The display will depict the data is shown on a map background. The time on the display time is then set using a ruler that can be moved manually by hand or made set to move automaticallyon its own.
The spatial display
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is made up of the following
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parts:
- Spatial/grid/A spatial, grid, or map display with configurable background layers that you can change
- A Control Toolbar with following generic general options for:
- Zooming in and panningout and moving around
- Turning map layers or metadata Toggling on and off map layers or meta data, such as , like labels, values, flags, thresholds, etc.
- A Time Slider Toolbar with the following generic general options (located found at the bottom of the map since 2019.02):
- PlayButtons for play, pause, stop, step forward, step backward, and record buttons
- Time A time slider with a time slice indicator
- Data An indicator for data availability and maximum value indicator (colours are in accordance with (the colors match the legend)
- Filters for selecting what to show in the Spatial Display selection filters (preconfigurable plots)
- Table or Bar Legend (with optional accumulation)
- (you can set up plots ahead of time)
- A table or bar legend (you can choose to accumulate data)
- Options for exporting or recording Options to export or record data and time series
Control Toolbar
The toolbar provides the offers controls for displaying presenting the spatial information via through the following various buttons. The functionality of zoom options and layers is explained detailed in the FEWS Explorer section. (see see chapter 2).
Button | Description |
|---|---|
| Contours. |
| You can turn contour lines on |
| or off |
| . Numbers |
| show up when the animation |
| is stopped or paused. The colors, which |
| show the value |
| , stay visible. A bilinear interpolation is used to |
| make the grid smooth. This is |
| necessary for calculating the contours. |
| Even when the labels and |
| contour lines are |
| turned off, the smooth grid |
| can still |
| be seen. The bilinear interpolation is only |
| used on the cells of the grid that are rectangular and |
| aren’t rotated |
| too |
| much compared to the screen orientation. |
| Grid lines. Toggles grid or polygon lines on or off |
| Product Info. Toggles product info on or off. (only shown if there are products present in the configuration, see the page on the Forecast Product Information Panel) |
| Labels. |
| You can toggle labels on or off |
| . The drop-down options include turning |
| locations, values, and/or units in the labels on or off, and increasing |
| or decreasing the number of decimals shown in the labels and tooltips |
| . Since FEWS 2022.02, this also |
| works for grids, but only when |
| you zoom in |
| until there are |
| fewer than |
| 20,000 grid cells displayed and one of the cells is larger than 10 pixels. |
| Value to local reference level. |
| Flags. Switches to flags for selected time series / gridplot (quality, modifiers or thresholds) |
| Search and select forecasts. Switches to (previous) forecasts. |
| Show spatial thumbnails. Toggles thumbnails of each time step below the main spatial display on or off. |
| Show spatial ensemble thumbnails. Displays the ensemble thumbnails panel. |
| Sketch mode buttons and other sketch drawing options. Switches the sketch mode between drawing points, adding points, drawing longitudinal profiles and drawing areas when the map is clicked. Contains additional options to save/load sketches and delete the current sketch. |
| Options to show a graph based on current sketch. Drop-down menu with options to extract scalar time series, vertical profiles, longitudinal profiles, 2D longitudinal profiles, calculate budget and calculating the mean max min time series (for sketched areas). |
| Activate spatial modifier mode. Toggles spatial modifier mode on or off (only shown if at least one spatial modifier is configured in ModifierTypes.xml). The additional modifier mode buttons shown when modifier mode is toggled on are explained in the spatial modifier section. |
| Display time. Choose display time (period) |
| Attributes. |
Time Slider Toolbar
Since 2019.02 the The time slider and its buttons have been moved to a separate toolbar located at the bottom of the spatial display.
| Preload. Since the 2019.02 the grids are downloaded on the fly. With the The preload button allows the grids for all time steps are to be downloaded in the background to have . This ensures a smooth animation without pauzes. A pauses. The progress of the download is indicated by a green line in on the time slider shows the progress of the download. | ||
| Play. Starts continuous play mode. The slider will indicate the time slice being shown. This button is merged with the pause button. So after this button is pressed, the pause button appears. | ||
| Pause. Stops continuous play mode. The time slider remains at the time displayed at the moment. This button appears if the play button is previously pressed and the continuous play mode is running. | ||
| One frame back. Moves the time slider back one timestep. | ||
| One frame forward. Moves the time slider forwards one timestep. | ||
| Record. Creates an . This function creates a movie file in AVI or animated gif movie file. The avi GIF format. By default, the AVI format is used by default unless the filename ends with '‘.gif'gif’. After opening Once the file is opened, the display will start playing from the current time position , and will continue until the stop button is clicked. | ||
| Time sliderSlider | The time slider can be dragged to specific time slice. | ||
Data availability | The data availability indicator provides gives a visual clue as to where you can find data. For those times where hint about where data can be found. When data is available, the colour color of the data availability indicator will be set to match the maximum highest value found in the data for that time slice.
|
Selection filters
The selection filters show indicate which displays have been configured. Select set up. You can select a filter to display show the data. Note Keep in mind that each grid display may might be configured set up differently, i.e. with a different period of data to be displayed, with a different background map, etc, for example, they might show data from different periods, use different background maps, and so on. The configuration allows certain filters to be highlighted in in bold.
Locations attribute filter
With the location attribute filters, you can hide one or more locations/grids in the plot. The 
button ( 
) is only visilbe then attribtes visible when attributes are configured for the plot.
Legend
The legend can be
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displayed as a table
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or
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a bar
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.
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It identifies the color
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associated with each range of values.
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You can rescale the range of values
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for each color
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by right-clicking on the display and
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choosing ‘Rescale Classification’ from the pop-up menu. The display colors will then be updated to
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match the new classification. After rescaling, the lowest and highest values in the legend will
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match the minimum and maximum values of the data in the current zoom extent of the display (for the selected time slice).
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If you zoom in on an area where all data points or grid cells have similar colors, you can use rescaling
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to better see
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the differences in
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data values. To
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go back to the default classification, right-click on the display and
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choose ‘Back To Default
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Classification’ from the pop-up menu. When
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you select a different plot, the classification always
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reverts back to the default
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for that plot.
The user Users can change the classification colors by double-clicking the colored squares in the table legend. These changes are stored saved in the user settings. If a user has made changes, they can be discarded discard them by right-clicking the display and selecting 'Discard ‘Discard User-Defined Classification Colors'Colors’.
When several multiple classifications are configuredset up, the user users can select a classification through from the drop-down menu located directly above the table legend.
A bar legend displays fluent displays fluent scale bar as shown in the picture below:
Moving Average or Accumulation Slider
The moving average slider can be
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set up to
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let the user
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choose from a number of moving average settings. Each moving average window is then recalculated for the
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whole period.
Both When you close the program, both the selected grid plot and the selected chosen aggregation time step are stored saved in the user settings when closing. When reopening you reopen FEWS, the same aggregation time step will be selected. When If you’ve selected an aggregation time step has been selected and the user switches and then switch between different plots, FEWS will attempt try to select the same time step again for the new plot. In the image below, the Moving Accumulation Slider is set to 1 day.
Since the 2023.02 the accumulation slider automatically contains an extra tick at the end of the slider do accumulate the time steps to/from the display time
Last Value Checkbox
When selected this checkbox shows is selected, it displays the last available of time series configured in the grid plot. This can be useful handy when there are multiple timeseries time series with a different or non-equidistant time step are steps defined within one grid plot, and a time is selected where one time series does not doesn’t have a time step. The time series can be either scalar or grid. For scalars, the last time step (that is still within the visible period) that does not have without a missing value is shown. For grids, but for grids just the last time step is shown, even though if it can might be a missing value. The checkbox will only appear when no neither an accumulation or nor a moving average slider has been configured, and it can be hidden via through configuration. The next screenshots show how data with a daily time step will appear at 22:00 even though it is not defined for that time:
Selecting different forecasts
Selecting different forecast times
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A “search and select forecast” (
) button is available
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. This button
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becomes active if
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more than one forecast is available,
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meaning there are
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multiple forecast time series with different forecast times
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in the database and the <numberOfRecentForecasts> is set to more than 1 for the selected grid plot.
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Clicking the button allows you to cycle through the available forecasts. The drop-down menu will
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display the forecast times of the available forecasts, and selecting one of these
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times will
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change the
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displayed forecast to the one selected.
Alternatively, you can use the spatial thumbnails can be used to select different forecasts (and select different time steps). The spatial thumbnails panel will show display one row for each available forecast available. Toggle the . You can toggle this panel on or off using the 
buttonthe button (
).
Selecting different ensemble members
Available since 2019.02. The can The button (
) can be used to open the spatial ensemble thumbnails panel.
The spatial ensemble thumbnails window will open
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, displaying a thumbnail for each
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individual ensemble member at the selected time.
In this window the user , users can select choose the desired ensemble thumbnail to visualize this they want to view. This selected ensemble member will then be visualized in the grid display.
The ensemble member is specified identified at the bottom of the thumbnail and on in the bottom right corner of the grid display.
The thumbnails can be resized at the bottom right corner of the first thumbnail, a . A resize mouse cursor will be show appear when hoovering hovering over that corner.
The size will be stoed stored in the user settings afterwardsfor future use.
Contours
The contour button calculates contours on the fly generates contours in real-time for the grids being displayed grids. Since 2021.01 showing contours also works , it’s also possible to show contours for irregular grids and over across multiple grids displayed as the same time. When simultaneously. When the contour button is pressed, bilinear interpolation is used to calculate a value for every each pixel individually. The grid display knows the grid cell for every pixel at the current map extent and zoom level is known by the grid display. The neighbor cell detection of neighboring cells is done at the screen pixel level and works for existing configurations. The interpolation is automatically switched turned off for individual cells that are not rectangular or are rotated more than 10 degrees compared to the screen. The contours are calculated for the interpolated pixel values for the current zoom extent. The contour button is disabled for point data and when contours are configured for a different parameter on top of the parameter that is using the colors from the legend.
Extracting data from the Spatial Display
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| Info | ||
|---|---|---|
| ||
In 2019.02 the options to extract data from the spatial display were moved from the right-click menu of the map to the drop-down menu of a new |
Export time step data in data in ascii grid-file
By right clicking on the display, the grid data for a specific timestep can be exported in an ascii file. Select the desirable time step with the control toolbar.
Extracting scalar time series from grid
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You can extract scalar time series
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from the grid by double-clicking on the point of interest. Depending on the type of data
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displayed, the scalar time series will
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correspond to
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a point, polygon, or grid cell.
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Here’s another way to do it:
- First, select the point of interest by left-clicking. A colored dot will
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- appear to
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- mark the selected point. For grid data, an additional green dot will be drawn to indicate the center of the selected grid cell (you may need to zoom in to see the green dot
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- if it overlaps with the colored dot
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- ).
- Extract the time series for the selected point either by selecting
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- ‘Show Time
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- Series’ from the drop-down menu of
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- the (
)button or by using the Ctrl+F3 shortcut.
Instead of immediately extracting the time series and showing
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a time series dialog, you can use the
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“Copy Time
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Series” option
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to copy the time series for the selected point to the FEWS clipboard. Copied time series can then
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be pasted
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into a time series dialog
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later using the paste button in its
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toolbar.
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You can draw several points by selecting the
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“Add Point” sketch mode through the sketch mode button (
) or by holding the left ctrl and shift buttons while left-clicking on the points of interest. When several points have been drawn, the
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“Show Time Series” and “Copy Time Series” options will show
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or copy separate time series for each of the drawn points.
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Instead of manually drawing a point
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or points, you can use the
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‘Show Time Series For
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Coordinates…’ option in the drop-down menu of
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the () button. This will open a small dialog prompting
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you to enter the coordinates of the point
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you wish to use.
A series
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extracted from a grid
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is not related to a known location or polygon ID. The series will
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be identified using the grid coordinates.
The graph will automatically pop up with the time series of the selected point, polygon, or grid cell. When animating the grid display, a marker will move over the time series graph as well.
To extract a different scalar time series, double-click on another point of interest. This will draw a new dot and extract a scalar time series for that point. Please
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note that when extracting a scalar time series from a data point in the display,
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the dot drawn on top of the data point has a different
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color from the point itself. This
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might make it
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look like the data point has a different color because of the dot. The dot can be erased by selecting
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‘Delete Points’ in the drop-down menu of the sketch mode button (or using the keyboard shortcut Ctrl+Delete).
Note:
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It’s important to stop the grid movie before
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creating a time series graph
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. Running both at the same time can slow down the system
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due to the heavy processing load from executing multiple processes simultaneously.
The extraction
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of scalar time series is not available for rotated pole geodatum types. In some cases, the extraction of scalar time series
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may behave unexpectedly near the North Pole or South Pole.
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Extracting scalar time series for each ensemble member at one from grid
Since Since the 2020.01 it is version, it’s possible to show display the scalar time series for each ensemble member for a single grid cell.
Extracting vertical profiles from 3D data
When the spatial display is
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presenting 3D (layered) data, you can extract a vertical profile
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. Here’s how:
- Draw a point as described in the previous section.
- Then,
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- select the
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- ‘Show Vertical
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- Profile’ option in the drop-down menu of the
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- button or press Ctrl+
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- F4. This will open a time series dialog with the vertical profile for the drawn point.
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Alternatively, you can use the ‘Show Vertical Profile For
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Coordinates…’ option in the drop-down menu or
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press Ctrl+Shift+F4.
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You can also create a vertical profile with a color map
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:
- Select the ‘Use Color Map’ option in the drop-down menu of
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- the button or use Ctrl-M.
- The vertical profile will then be
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- displayed as a graph of
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- a parameter over time, with the colors in the plot indicating the values of the selected parameter.
Extracting longitudinal profiles (Xsections) from a grid time series
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