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Questions and Answers
A higher opaque limit requires more overlapping points to achieve a fully ______ color.
A higher opaque limit requires more overlapping points to achieve a fully ______ color.
opaque
In Transparent mode, transparency is fixed by the ______ limit.
In Transparent mode, transparency is fixed by the ______ limit.
opaque
Auto shading mode colors isolated points in their selected ______.
Auto shading mode colors isolated points in their selected ______.
color
Density shading mode shows how crowded or dense areas of the plot are by using ______.
Density shading mode shows how crowded or dense areas of the plot are by using ______.
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The Density Shader allows you to pick a ______ style for showing data density on a plot.
The Density Shader allows you to pick a ______ style for showing data density on a plot.
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Relative maps adjust the base color of your data like making it lighter or ______ to show density levels.
Relative maps adjust the base color of your data like making it lighter or ______ to show density levels.
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Shader Quantise allows you to adjust the number of different ______ where a color map is applied.
Shader Quantise allows you to adjust the number of different ______ where a color map is applied.
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Shader Flip determines whether the density scale maps ______ or backwards into the color map.
Shader Flip determines whether the density scale maps ______ or backwards into the color map.
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In TOPCAT, increasing Shader Quantise results in fewer ______ available in the color map.
In TOPCAT, increasing Shader Quantise results in fewer ______ available in the color map.
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The Density Subrange feature allows you to control which range of ______ values is displayed in the color map.
The Density Subrange feature allows you to control which range of ______ values is displayed in the color map.
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In Aux mode, point colors are determined by an additional data ______.
In Aux mode, point colors are determined by an additional data ______.
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The Opaque Limit slider controls the ______ of the points in the plot.
The Opaque Limit slider controls the ______ of the points in the plot.
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Weighted mode in TOPCAT colors plot points based on density while applying a ______ factor to each point.
Weighted mode in TOPCAT colors plot points based on density while applying a ______ factor to each point.
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The Size form varies marker sizes based on ______ values to illustrate patterns in the data.
The Size form varies marker sizes based on ______ values to illustrate patterns in the data.
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In SizeXY, the width and height of the shaped marker vary independently according to two supplied ______.
In SizeXY, the width and height of the shaped marker vary independently according to two supplied ______.
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Increasing Shader Quantise results in a transition from smooth to ______ colors.
Increasing Shader Quantise results in a transition from smooth to ______ colors.
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The marker shape can encode two additional dimensions of the ______.
The marker shape can encode two additional dimensions of the ______.
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The Vector form plots directed lines from the data position given delta values for the ______.
The Vector form plots directed lines from the data position given delta values for the ______.
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The error along the horizontal and vertical directions is referred to as ______ Error.
The error along the horizontal and vertical directions is referred to as ______ Error.
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Line form draws a point-to-point line joining up the ______ making up the data set.
Line form draws a point-to-point line joining up the ______ making up the data set.
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The Linear Fit form draws a straight line to represent the general ______ of the data.
The Linear Fit form draws a straight line to represent the general ______ of the data.
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A ______ is a value that marks a specific percentage in a data set.
A ______ is a value that marks a specific percentage in a data set.
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In the Contour form, position density ______ provide another way to visualize crowded plot characteristics.
In the Contour form, position density ______ provide another way to visualize crowded plot characteristics.
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The slider control goes from 0 (minimum) to 1 (maximum), so 0.5 indicates the ______.
The slider control goes from 0 (minimum) to 1 (maximum), so 0.5 indicates the ______.
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A plane plot is a type of ______ plot.
A plane plot is a type of ______ plot.
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In TOPCAT, a plane plot is commonly used for applications requiring ______ graphs.
In TOPCAT, a plane plot is commonly used for applications requiring ______ graphs.
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The most common form of plotting in TOPCAT is called ______.
The most common form of plotting in TOPCAT is called ______.
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Shading modes in TOPCAT control the ______ displayed for each data point's shape.
Shading modes in TOPCAT control the ______ displayed for each data point's shape.
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The ______ shading mode colors points in the color selected by their style without additional parameters.
The ______ shading mode colors points in the color selected by their style without additional parameters.
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The Translucent shading mode applies a ______ version of the selected style color to shapes.
The Translucent shading mode applies a ______ version of the selected style color to shapes.
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In Transparent shading mode, the transparency level is controlled by the ______ Limit slider.
In Transparent shading mode, the transparency level is controlled by the ______ Limit slider.
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Shading in plane plots may be influenced by additional ______ coordinates.
Shading in plane plots may be influenced by additional ______ coordinates.
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Study Notes
Plane Plot Definition
- TOPCAT (Tool for Operations on Catalogues and Tables) uses plane plots as scatter plots
- Plane plots display position data points according to X and Y coordinates
- The plane plot is the most basic plot type in TOPCAT
- It is commonly used for two-dimensional graphs, and to visualize relationships between two variables or attributes in a dataset
Plot "Forms"
- Plot "forms" are instructions for shaping data representations on a plot.
- They use positional data from a table to determine shapes.
- "Mark" is the most common form, placing a marker at each data position.
- Each marker in the "Mark" form has a fixed shape and size.
1. Mark Form
- The 'Mark' form plots markers with a fixed shape and size.
1.1 Shading Mode
- Defines the basic color used for plotting each data point.
- Many forms allow selecting a shading mode to control the point's color.
- Shaded colors are based on the chosen style color
- Shading influenced by the number of points at a location
- Additional data coordinates
- Other configuration details
1.1.1 Flat Mode
- The Flat shading mode colors points by the selected color style.
- It has no additional parameters.
1.1.2 Translucent Mode
- The Translucent mode uses a transparent version of the selected color style.
- Transparency depends on
- Number of overlapping points.
- Transparency Level slider settings.
- Increasing the slider to the right increases transparency.
1.1.3 Transparent Shading Mode
- Transparent shading mode applies a transparent version of the selected color style to shapes.
- Transparency controlled by the Opaque Limit slider.
- Moving the slider left makes points wholly opaque (like Flat mode).
- High opaque limit demands more overlapping points to achieve fully opaque color.
- Transparency is fixed by the opaque limit, and doesn't depend on point density.
1.1.4 Auto Shading Mode
- Auto shading mode colors isolated points in their chosen colors.
- Overlapping points darken to indicate density.
- Similar to Flat mode for isolated points, or points in non-crowded areas.
- Auto mode helps easily find dense areas in a plot.
1.1.5 Density Mode
- In TOPCAT Density mode shows crowded / dense regions of a plot using color variations.
- The colors reflect point overlap; more overlap = darker color.
1.1.5.1 Density Shader
- TOPCAT's Density Shader lets you pick a color style to display data density.
-
Relative Maps adjust the base color based on density levels. This preserves original dataset colors.
- Useful for comparing multiple datasets.
-
Absolute Maps ignore original colors and make density stand out.
- Beneficial for single datasets to highlight density.
1.1.5.2 Shader Flip
- Controls if the density scale maps forward or backward through the color map.
1.1.5.3 Shader Quantise
- TOPCAT allows adjusting the number of colors used in a color map (Shader Quantise).
- Fewer colors are visible as the value is increased. Instead of a smooth gradient, there are stepped layers of color.
1.1.5.4 Density Subrange
- Density Subrange lets you adjust the plotted density range.
- By default, all density values are covered.
- The slider lets you limit the range, focusing on selected density levels. This can highlight specific density areas
1.1.6 Aux Mode
- Aux mode shades each point based on an additional data coordinate value.
- The shading uses the overall color map; values represented by the shade.
1.1.6.1 Aux
- The aux coordinate is specified by name or a formula from the dataset table.
1.1.6.2 Opaque Limit
- Controls point transparency.
- Slider defaults to fully opaque points, moving it right gradually makes points more transparent
1.1.7 Weighted Mode
- TOPCAT Weighted mode uses colors based on point density.
- A weighting value assigned to each point affects the color intensity of each point.
- This mode lets you customize how these weights are combined to color each point.
1.2 Size Form
- The Size form adds data to a plot by adjusting the size of plot markers based on data values.
1.3 SizeXY Form
- The SizeXY form uses marker width / height values as data, independently, to reflect data, thus showing extra dimensions.
1.4 Vector Form
- Vector form plots directional lines from data positions, with delta values indicating changes in coordinates.
1.4.1 X Delta, Y Delta...
- These values, X Delta, Y Delta, etc, define the delta shifts applied at each point to create vector directions
1.4.2 Arrow
- Arrows are a selectable plotting marker style option.
1.4 XY Error
- X/Y Error markings display plotting errors in horizontal and vertical directions from column names/expressions.
1.5 Line Form
- Line form directly plots point-to-point lines across all the point data.
1.6 Linear Fit
- Linear Fit provides a straight line on a plot to identify general data trends.
1.7 Quantile Form
- Quantile form draws a line to show a specific percentage of values in a data range, ignoring extreme values.
- Line smoothing options provide clearer pattern identification.
1.6.1 Quantiles
- Quantiles define the range of values that should be visualized in each pixel, ranging from their minimum to maximum values, with 0.5 indicating the median
1.7 Label Form
- Labels identify points by each plot position value by displaying a text label.
1.8 Contour Form
- Contour form creates density plots.
- It offers an alternative approach to displaying over-dense regions in a crowded plot, along with other shading methods.
1.8.1 Levels
- Contour levels represent the specific values that contours in the plot are calculated from; these levels may contain no direct physical significance if combined with various combination values
1.9 Fill Form
- Fill form populates the plot region where values exist for a curve in a continuous way using a solid color .
1.10 Grid Form
- The Grid form displays 2D point data on a plot, dividing it into rectangular grid cells.
- Weighted values/ density maps, or 2D histograms can be shown.
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Description
Explore the fundamentals of plane plots in TOPCAT, including how they are utilized for displaying position data points in a two-dimensional space. This quiz covers various 'forms' of plotting data and the specifics of the 'Mark' form, including color shading options.
