CATT HELP BOOK

1
CATT HELP BOOK
2
CATT Screen Layout and User Interface

• The CATT program interface consists of two
  frames
• Top Frame Map consisting of super positioned
  data layers
• Bottom Frame list of data layers and other tools
  for rendering and filtering data

3
Overview of CATT controls

• The top row controls opening new files and
  manipulating the map frame

• Open data layers that make up the map are
  controlled below

4
Location Selection

• The data layers are linked such that when a new
  site is selected the other layers update
  automatically
• A new site can be selected by knowing the
  location code or name
• Clicking the map on the desired location will
  also change the location

5
Filters Parameters, Time Range and Date

• Chemical parameter filter restricts trajectories
  to days when chemical filter is satisfied
• Time range for aggregation default is 1988-2000
  To restrict time range you must change it in
  ATAD_Grid1 and ATAD_Grid2
• Months of aggregation default performed on all
  months To restrict uncheck boxes for months not
  wanted

6
Transport Metric Selection

• Currently, there is a choice of two different
  transport probability metrics
• Incremental Residence Time Probability (IRTP)
  proposed by Poirot et al., 2001 is the difference
  between the chemically filtered and unfiltered
  residence time probalbilities. Positive values of
  IRTP in a grid indicates more than average
  liekihood of transport (red) negative IRTP
  values (blue) represent less than average
  likeihood of transport.
• Potential Source Contribution Function (PSCF)
  proposed by Hopke et al., 19?? is computed as the
  ratio of the filtered and unfiltered residence
  time probabilities. Higher values of PSCF is
  indicative of inreased source contribution.
• The desired metric is selected through a dialog
  box invoked by clicking on the right-most button
  in the TRAJ_CHEM layer.

7
Map Navigation

• The map display can be adjusted by using pan,
  zoom, and layer ordering tools

8
Rendering Options

• Coloring scheme uses rainbow
• Bluelow Redhigh
• This is adjusted by clicking Render button

9
File Menu and Data Export

• Save Current Page
• In pull down file menu (below map) select Save
  Page
• Enter a filename in dialog box
• Press Save page as
• Open saved page
• In file menu select Open page
• Select desired file
• Note initial loading takes up to 90 seconds
• The reload button will turn red any time changes
  are made- when this happens click and the map
  will refresh