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Annual Summary Help
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General |
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Purpose
The Annual summary section of the
VIEWS web site provides access to data products described in the
VIEWS scope of work. It also provides browsing capabilities of
the IMPROVE aerosol database using graphical interfaces.
Use
Pages in the Annual Summary are made up of VIEWS and CONTROLS.
The views represent spatial, temporal, or compositional dimensions of the
data. The controls allow the user to update the views with selected
data. Some views are interactive in that the user can mouse
click on various regions to update data selections. For example, all
Map Views allow the user to select a new monitoring location by clicking
on a monitoring site icon. Other views are static in that
they do not respond to mouse clicks.
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Spatial Patterns
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Data Views:
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Map View (Interactive
selection of monitoring locations)
This view displays contours
of the selected parameter for a selected year and data
aggregation. Selecting a site icon from the map populates the timeline
view with data for that site. The selected site is displayed with a
red icon.
Timeline View (Static)
This view shows daily values for the selected site and
parameter. Sampling days in the chosen data aggregation
are highlighted. Either chemical extinction or the selected
parameter can be used as a sort variable for the best or worst 20% days.
Tabular Data Summary (Interactive
selection of method information or aggregate data statistics)
This view shows method information or data
statistics for the selected monitoring site. When viewing data statistics,
'N samples' is the number of samples in the data aggregation and 'N
substitutions' is the number of values substituted using guidelines outlined in
the
RHR tracking progress document.
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Page Controls:
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Year
Select from available years.
Parameter
Select from available parameters. A note on
parameters that denote species fractional contributions: As an
example, the parameter F_(NH4)2SO4 is the fractional contribution of
calculated ammonium sulfate to reconstructed fine mass. The parameter
F_(NH4)2SO4_bext is the fractional contribution of calculated ammonium
sulfate extinction to chemical extinction. When these
fractional parameters are presented as aggregations over more than one
sampling day the fractional contribution is calculated on a daily basis prior
to aggregating the data. This calculation method is referred to
as taking the 'mean of ratios'. Calculations using the 'mean of
ratios' methodology are recommended for presentation of aggregated fractional
species contributions of IMPROVE data.
Data Aggregation
Data aggregation options include the average of the annual, quarterly,
and best or worst 20% of sampled days in the year. The best and worst 20%
days can be chosen by using chemical extinction (aerosol_bext) or the
selected parameter as a sort variable.
Sort Parameter
The Sort Parameter radio button becomes active if Best 20% or Worst 20%
data aggregations are selected. This allows the user to choose between
aerosol extinction or the selected parameter as sort variable. For
example, if CM (Coarse Mass) is selected in the parameter box the user can
populate the map view with CM concentrations on the highest 20% aerosol
extinction days OR the highest 20% CM concentrations days. The time line
view will highlight the sampling days included in the respective aggregation.
Interpolation
Interpolation refers to the interpolation scheme used to create the
contour map. Options are Kriging (Krig) and inverse distance weighting
(1/R2). The kriged surfaces were created using a spherical
semivariogram model with model parameter range of 7 radial degrees and
nuget of 0. The 1/R2 interpolation uses the inverse square of the
distance between each observation and grid point to form the weighted mean
of all observations at each grid point. In both interpolation
schemes observations are interpolated to 1/2 degree latitude by 1/4 degree
longitude grids.
Tabular Data Summary
This control allows for selection between data statistics for the chosen data
aggregation and method information. |
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Composition
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Data Views:
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Map View (Interactive
selection of monitoring locations)
This view displays IMPROVE aerosol monitoring sites with data for the
for the selected year and data aggregation. Click on a site icon to
populate other views with data from that site. If a site is selected it
is displayed with a red icon.
Pie Chart View (Static)
This view shows the average species' composition for the selected
parameter and data aggregation. Note: The percentage contribution of each
species to the total represents the contribution of the individual aggregation
to the total and not the average fractional contribution (see the parameter
section for more details). Data aggregation options are average of the
annual, quarterly, or best or worst 20% aerosol
extinction days.
Timeline View (Interactive selection of individual
sampling days)
This view displays the daily sample values for the selected site, year, and
parameter. Selected data aggregations are
highlighted. Selecting an individual sample day from the timeline
updates pie view with the selected parameter composition for
that day.
The
daily timeline plot includes a daily
sample status bar. Located at the top
of the timeline, the status bar indicates
whether a daily sample is valid, contains
substituted values, or is missing some or all of
the aerosol components required to calculate
aerosol extinction. Daily samples missing
some or all of the aerosol extinction components
do not participate in the best and worst 20%
groupings. Sampling days excluded from the
groupings but with some valid components are
readily discernable from the status bar.
Tabular Data Summary (Interactive
radio button selection of method information or aggregate data
statistics)
This view shows calculation method information for
the selected parameter.
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Page Controls:
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Map
Use the map control to select regions and to zoom and pan the
map. The map Selection Pointer (a red cross) indicates the point on the
map of your last mouse click. The Selection Pointer remains in the
same position when you zoom in or out. Click on the pan compass
image to move the map in a desired direction. Clicking further from the
compass center moves the map a greater distance.
Select
from Year
Select from available years.
Data Aggregation
Select from available data aggregations. 'Available Species'
shows any available mass components on a given sampling day. This is
useful to fill gaps in the timeline when some but not all component species are
missing.
Parameter
Select from available parameters.
Available Species will show the sum of available Total Mass components. A
note on the percentage values adjacent to the pie chart values: The
percentages indicate the contribution of each 'slice' of the pie to the sum of
all components in the pie. When percentages are calculated in this way
the calculation method is referred to as taking the 'ratio of
means'. Due to the nature of the IMPROVE dataset, percentages calculated
using the 'ratio of means' will not necessarily agree with percentages
calculated using the 'mean of ratios' method (see the parameter section of
either the Trends or Spatial Patterns pages). Calculations using the
'mean of ratios' methodology are recommended for presentation of aggregated
fractional species contributions of IMPROVE data.
Tabular Data Summary
This control allows for selection between
data statistics for the chosen parameter, parameter composite species, and
method information.
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Trends
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Data Views:
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Map View
(Interactive selection of monitoring locations)
This view displays IMPROVE aerosol monitoring sites with data for the for the
selected year and data aggregation. Click on a site icon to populate
other views with data from that site. If a site is selected it
is displayed with a red icon. Multiple sites can be selected if
the 'Multi' time plot mode is chosen.
Timeline View (Interactive
selection of plot features)
Timeline data can be selected by
parameter, data aggregation, and type of trend (annual or
multi-year rolling averages). Attributes of the timeline plot such
as the date, value range, and plot height can be adjusted. If the
timeline does not update based on your selection there may not be data
available for the selected parameter or aggregation. Any selections that
do not retrieve valid data should display an error message
. Single or multi-year aggregations are available. For multi-year
averages data are first averaged annuually, then the annual means are
averaged over the multi-year time period. Rolling averages
for 3-year and 5-year periods use the selected year as midpoint of
the averaging period. At least 2 years of valid data are required for the
3-year rollling averages, and at least 3 years of valid data are required for
the 5-year rolling averages.
Tabular
Data Summary (Interactive selection of trend data, aggregate data
statistics, or method information)
This view shows either calculation method
information or the trend data values for the current selection.
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Page Controls:
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Map
Use the map control to select regions and to zoom and pan the
map. The map Selection Pointer (a red cross) indicates the point on the
map of your last mouse click. The Selection Pointer remains in the
same position when you zoom in or out. Click on the pan compass
image to move the map in a desired direction. Clicking further from the
compass center moves the map a greater distance.
Parameter
Select from available parameters. A note on parameters that
denote species fractional contributions: As an example, the
parameter F_(NH4)2SO4 is the fractional contribution of calculated
ammonium sulfate to reconstructed fine mass. The parameter
F_(NH4)2SO4_bext is the fractional contribution of calculated ammonium
sulfate extinction to chemical extinction. When these
fractional parameters are presented as aggregations over more than one
sampling day the fractional contribution is calculated on a daily basis prior
to aggregating the data. This calculation method is referred to
as taking the 'mean of ratios'. Calculations using the 'mean of
ratios' methodology are recommended for presentation of aggregated fractional
species contributions of IMPROVE data.
Data Aggregation
Select from available data aggregations.
Trend Type
Select either annual averages or 5-year
rolling averages. 5-year means are not currently available.
Time
Plot Mode
The Timeline has two
modes, 'Single' and 'Multi'. In Single mode the timeline will display your
most recent selection. In Multi mode each additional selection adds
another timeline to the display. Up to 6 timelines can
be superimposed in 'Multi' mode. Parameters must have the same units
to be superimposed in 'Multi' mode. To remove multiple
plots from the view, select 'Single' mode and your most recent selection is
displayed.
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Back Trajectories |
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Data Views:
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Map View (Interactive
selection of monitoring locations and compass pan control)
The map view displays back trajectories from the Atmospheric
Transport and Deposition (ATAD) model. Click on a site icon to view
trajectories ending at that site for a given day. The selected site is
displayed with a red icon. The map also shows a compass icon that
responds to mouse clicks and allows panning of the map image. The four
daily trajectories shown on each map correspond to different arrival times in
which an air parcel following the displayed trajectory arrives at the
monitoring site. Red trajectories arrive at 0500 hrs. on the
selected day, white at 1100 hrs., blue at 1700 hrs., and black at
2300 hrs. Arrival times are standardized to standard Mountain
Time. Each plot symbol on a trajectory indicates an air parcel position
three hours older than the next parcel along the trajectory line to the
site. Complete trajectories go back 5-days.
Timeline View (Interactive selection of individual sampling days)
This view shows IMPROVE parameter values for the selected year. The best
and worst 20% aerosol extinction days can be highlighted to help associate
individual sampling days with air mass source regions for that day. Click
on a daily value from the timeline to display that days' trajectory, or
use the BACK and FWD
buttons to move to the next or previous days' trajectory. Trajectories are
available for all days in the calendar year.
Tabular Data Summary (Static)
This view shows calculation method information for
the selected parameter.
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Page Controls:
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Year
Select from available years.
Timeline
Highlight
Select best
or worst 20% aerosol extinction days to highlight in timeline.
Timeline Parameter
Select from available parameters to
display in timeline.
Map Controls
Button Show/Hide Compass:
Either show or hide the navigation compass at the lower left corner of the
map. The compass responds to mouse clicks which can be used to pan
the map in any direction. Clicks further from the compass' center move
the map greater distances. The map extent is 120 to 60 degrees west
longitude and 22 to 50 degrees north latitude. Button
Center Map: Restores the default position of the map. Button
View Map Legend: show region of the map with legend information.
Time
Step
Use the BACK
and FWD buttons to move to the previous or next
days' trajectory
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