Primer Curso Práctico de la red Temática SVO
Granada, 27-28 de octubre de 2009
TOPCAT & STILTS
Francisco Jiménez Esteban
Spanish Virtual Observatory
LAEX-CAB (INTA-CSIC)
TOPCAT
• Interactive graphical viewer
and editor for tabular data.
• It can examine, analyse,
combine, edit and write out
tables.
• It understands a number of
different astronomically
important formats.
• A million rows by a hundred
columns.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Control Window
- The right hand panel describes the characteristics of the
current table.
- The buttons along the top allow launching of various other
windows.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Load Windows
Load Data:
- You can load your
local tables.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Load Windows
Cone Search:
- Service available on
the web.
- The list is obtained
from a VO registry.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Table Windows
Data:
- Scroll around.
- Sort rows.
- Define subsets.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Table Windows
Columns:
- Information about
each column.
- Columns can be
hidden/revealed,
and new ones
added.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Table Windows
Subsets:
- See all the row
subsets defined,
and to define
more.
- Can be defined
using algebraic
expression, or
graphically.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Table Windows
Statistics:
- Calculate statistics for all or a selection of rows.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
1D histograms:
- Set axis labels and ranges
- Set bin width and offset
- Different colors or symbols
for different sets of data.
- Error bars
- Configurable plot markers
- Zoom in or out.
- Select a Subset.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
2D:
- Plot pairs of
columns.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
3D:
- Plots on Cartesian axes.
- Rotate the axes by
dragging the mouse.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
Spherical Polar:
- Plots 3D plots on spherical
polar axes.
- Plot points only on the
surface of the sphere or on
the interior.
- Rotate the axes by
dragging the mouse.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
Stacked Line:
- Plots one or more X-Y line
plots using the same X axis
but different Y axes.
- This can be particularly
useful for visualizing timeseries data.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Plot Windows
Density Maps:
- The intensity of color at
each pixel reflects the
number of points that fall
within its bounds.
- Pixel size can be changed,
cut levels can be altered.
- This is very useful for
analysis and visualization of
extremely crowded plots.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Match Windows
Concatenate:
- Concatenate the rows of
existing tables to create
new ones.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Match Windows
1 Table:
- Mark groups of rows.
- Eliminate All grouped.
- Eliminate All but First.
- New tables with groups.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Match Windows
2 Tables:
- Specify a match operation
which will join two tables.
- A wide range of
multivariate matches is
possible.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
TOPCAT: Functions Windows
Available Functions:
- Displays the details of the
functions which can be used to
define new columns and
subsets.
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
STILTS
STILTS is a set of command-line tools for
processing tabular data. Its facilities:
- Cross-matching
- Format conversion and validation
- Column calculation and rearrangement
- Row selection
- Sorting
- Plotting
- Statistical calculations
- Metadata display
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
STILTS
- Accept streamed data so the size of tables
which can be processed is not limited by
available memory.
- In general, the form of a command is
java –jar /path/stilts.jar <stilts-flags> <task-name> <task-args>
Francisco Jiménez Esteban – SVO – [email protected]
Granada 27-28 de octubre de 2009
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TOPCAT: Plot Windows - Spanish Virtual Observatory