10.1.1 Alphabetized List of Defaults

Audio

On Sun Sparcstations equipped with an audio board and speaker, SatView has the capability to provide audio comments. They are entirely superfluous.

BorderLineWidth, ContourLineWidth, MapLineWidth, VectorLineWidth

These defaults specify the width of nthe lines used to draw the different types of entities. The width is in screen pixels. A value of zero tells the X server to draw a line one pixel wide the quickest way it knows how.

ButtonAreaWidth

This value is in screen pixels and tells SatView how wide to make the area that contains the toggle buttons. This is more control than most users will want, but it gives the user the power to expand this area if it truncates the buttons (due to long file names).

BWPrinter

The user may specify the name of a printer to receive a greyscale file when Hard Copy is selected from the File menu. This is for black and white or greyscale output.

Chunks

When SatView draws a satellite data file, it displays the image a bit at a time. The default Chunks is used to set how many pieces to break the image up into for display while computing the image. For instance, if Chunks is 20, the screen will be updated as each 1/20th of the total number of scanlines is computed. In the case where Chunks is 0, the screen is updated after every scanline. SatView is fastest when Chunks is 1 (nothing is displayed until all computation is complete).

ColorBarFontFamily, OverlayFontFamily, MapFontFamily, TitleFontFamily

Use these defaults to choose the font families to use for SatView's text. See the discussion of fonts in the Properties section (Sec. 7).

ColorBarFontSize, OverlayFontSize, MapFontSize, TitleFontSize

Use these defaults to specify the size of SatView's text. See the discussion of fonts in the Properties section (Sec. 7).

ColorBarFontStyle, OverlayFontStyle, MapFontStyle, TitleFontStyle

Use these defaults to specify the style of SatView's text. The four available styles are: Normal, Bold, Italic, and BoldItalic. See the discussion of fonts in the Properties section (Sec. 7).

ColorPrinter

This default is analogous to BWPrinter, except the named printer is intended for color output. The color printer is used exclusively by the Color Hard Copy function in the File menu.

ContourLabelBoxes

Set to TRUE if boxes are desired for ordinary labels in line contour overlays. Set to FALSE otherwise.

ContourLevels

This defines the default number of levels used to draw contour overlays. Legal values are between 2 and 100. Twelve to fifteen is reasonable.

ContourLineStyle

Contour overlays may be either `Solid' or `Dashed' lines.

CursorTracking

If CursorTracking is on, the latitude and longitude of the cursor position will appear in the SatView window footer as the cursor is moved around the drawing area. If it is off, this information will not appear, and the amount of network traffic generated by SatView will be greatly diminished. Note: turning CursorTracking off reduces network traffic by ignoring cursor motion within the drawing area. Thus, canvas dragging is also disabled.

Extrapolate

SatView computes the bounds of the polygon representing a single data point by using the latitude and longitude of the point as one corner and using the latitude and longitude of the next point in the scanline and the corresponding two points in the next scanline. For this reason, SatView ordinarily cannot draw a polygon for the last point in each scanline because it would need a point after it to compute the bounds of its polygon. If the Extrapolate default is TRUE, SatView will take a reasonable guess at where the next point in the scanline ought to lie, and draw up a polygon representing the last point.

GlobPattern

The user is permitted to provide a pattern that describes the list of files he or she wants listed in the file-selection popup windows. For instance, the string "*.lw *.sw */" would cause all files ending with ".lw" or ".sw" and directories to be listed. All normal Unix wild card characters are permitted.

GridSpacing

GridSpacing is the number of degrees between adjacent latitude and longitude lines in the map grid. Legal values are from 2 to 90.

Hammer

This default should be set to TRUE to include the Hammer-Aitoff projection as an option in the list of available projections. However, this projection is available only at the University of Washington Atmospheric Sciences Department. Other sites should set this default to FALSE or just omit it altogether.

HighlightColor, HighlightColor1, HighlightColor2, HighlightColor3, HighlightColor4

These are for transient and static highlight colors. See the section (Sec. 6.2) on using the mouse in the label bar for functions employing these defaults.

HiLowLabelBoxes

Set to TRUE if boxes are desired for High and Low labels in line contour overlays. Set to FALSE otherwise.

ImageBGColor

ImageBGColor sets the background color for the image area. Legal values include any string defined in the color database in /usr/lib/X11/rgb.txt.

ImageHeight and ImageWidth

These set the default dimensions (in pixels) of the image area of a SatView frame.

MapColor

MapColor is the default color for the maps. Legal values include any string defined in the color database in /usr/lib/X11/rgb.txt.

MapProjection

MapProjection sets the default projection to be used in rendering swaths, maps, and overlays. NCAR Graphics provides a number of different projections. Below is a table of the legal strings for this parameter and their associated projections.

String Projection

CE: Cylindrical Equidistant
OR: Orthographic
ST: Stereographic
LC: Lambert Conformal Conic
LE: Lambert Equal Area
GN: Gnomic
AE: Azimuthal Equidistant
SV: Satellite View
ME: Mercator
HA: Hammer-Aitoff
MO: Mollweide

MapResolution

This is a confusing parameter that you should probably leave at zero unless you really need to change the coarseness of the map. This value tells the map-drawing software how wide (in pixels) the screen area is so that it may decided how fine to draw the map. If this parameter is set to the special value of 0, SatView will automatically pick a reasonable value. If you want to guarantee that you are getting top resolution, set a very high value (i.e., 15000). Or, conversely, if you are running SatView over a slow network or phone line, you might set this to a very low (~150) value to increase speed.

MapState

MapState determines the visibility of the map upon creating a satellite image window. Legal values are On and Off.

Map X/Y Max/Min

Do not change these attributes. SatView will cease to function.

MarkerSize

Users may specify the size of markers used to draw overlay files of type OV_UNGRIDDED_SCALAR. If the number specified is n, the width and height of the marker will be 2n+1 pixels.

MaskLand

Set this option to True to fill in land masses visible in opaque images to the background color.

Number of Vectors Across

Set this value as a hint to SatView when the default settings don't produce a reasonable vector overlay plot (i.e., the vectors are too small or too large). Tell it how many vectors of a reasonable size you think ought to fit across the screen. Tinker with it until the plot is satisfactory.

NumHistogramBars

The user may specify the default number of bars to use in drawing histograms. Legal values are between 2 and 150.

OutlineStyle

Outline type overlays can be drawn either as connected lines or distinct points. Legal values for OutlineStyle are `Points' and `Lines'.

OutputFormat

Legal values are `XWD', `HDF',`PS` and `PSDUMP'. This is the format of the files created by the Dump Image to File function of the File menu. See the discussion of Output Format in the Properties section (Miscellaneous) of the manual (Sec. 7.5.1).

OverlayColor

OverlayColor is the default color for the overlay contours and vector fields. Legal values include any string defined in the color database in /usr/lib/X11/rgb.txt.

PaletteFile

Each user may specify any number of palettes he wishes to always be available in SatView by placing them in the palette file specified via this default.

PaletteName

PaletteName specifies the name of the default palette to be used for satellite images.

Plat and Plon

Plat and Plon are the pole latitude and longitude, or the coordinates the user wants to appear at the center of the image area. Legal values for Plat are from -90 to 90. Legal values for Plon are from -360 to 360. These values are in degrees.

PSOrientation

This default may be Portrait or Landscape and tells SatView how to orient the PostScript output on the page.

QuickDraw

If QuickDraw is TRUE, then SatView implements a simple algorithm to accelerate rendering satellite data files. If the middle point of the scanline is not visible in the current projection, the whole scanline is skipped. Some data does not get displayed, but the speed in rendering large files of which only a small part is visible can be increased considerably. It is important to note, however, that this is a somewhat crude algorithm. Thus it is possible, when zoomed in very tightly, that scanlines of interest may be rejected. Legal values are TRUE and FALSE.

Resolution

Resolution is a value from 1 to 10 that controls how much of the satellite pixel data is used to render the swath. A resolution of 1 uses every data point; a resolution of 10 uses every tenth data point on every tenth scan line.

RetentionFactor

The retention factor was discussed in the sections on scrolling (Sec. 5.2) and attributes (Sec. 7.5.4). It controls how much of the image is retained off-screen after a zoom operation. Legal values are between 1 and 8.

StandardVectorMagnitude

In the case that the user wishes to circumvent SatView's automatic sizing of vectors, he may specify the StandardVectorMagnitude. A vector of this magnitude will be drawn such that it just reaches its neighbor if its direction is due east.

SwathStyle

SwathStyle determines whether one or several data files are plotted on a single swath canvas. Legal values are Single (one file per canvas) and Multiple (several files per canvas).

TimeSlicing

When TimeSlicing is TRUE, the user is permitted to interact with SatView even while it is plotting a satellite image file. The author can't think of any reason you would set TimeSlicing to FALSE.

TitleColor

The user may choose the color used for the title of each satellite image. This string must be in the X rgb database.

TitleSource

Use this default to specify the origin of the string to be used as the title of the image. Title uses the title field in the file (or the comment if there is no title field or the filename if there is no comment field). Comment uses the comment field. Filename simply uses the name of the file.

WrapCheck

Checking each data point in a satellite image to see if it will wrap around the screen is computationally expensive. Set WrapCheck to FALSE to turn it off.