This dialog window allows you to specify the break points and colors for the contour intervals used for mapping. The number of contour intervals is specified in the Map window, where access to this Map Contour Intervals window is provided.
• Color buttons – change the color of a specified interval by clicking the adjacent color button.
• Break points – change the break point between adjacent contour intervals by providing a new value in the space provided. Note that the new break point must be greater than the preceding point and less than the succeeding.
• Missing value – specify the missing value indicator for the data file. This value is usually embedded in the input file as part of the header information, and is automatically extracted by GS+.
• Get – read contour intervals from a text file; the first value of each record of the file is presumed to be a separate interval. The color associated with each interval is also read from the file if color information is available AND if the Include Colors box is checked (see below).
Color information for an interval appears as a second field on the line (record) that holds the interval. If color values are present and the Include Colors box is checked, the Color Source is set to Custom. If color values are not present in the file, no colors are changed even if the Include Colors box is checked.
The default extension for the contour interval file is .lvl, e.g. filename.lvl.
• Save – save the existing contour intervals to a text file. If the Include Colors box is checked, color information is also recorded as described for the Get command.
• Reset – Rebuilds intervals based on a uniform distribution (even intervals) between the lowest and highest value in the file. Does not reset colors – use the Color Source commands to reset colors.
• Include Colors – check this box to include color information when writing or reading the file that holds the contour interval values.
• Standard – specifies a default color pattern of red-orange-yellow….. violet.
• Blue – specifies a default color pattern of different shades of blue.
• Custom – specifies a custom color pattern defined below.
• Red – specifies a default color pattern of different shades of red.
• Green – specifies a default color pattern of different shades of green.
• Gray – specifies a default color pattern of different shades of gray.
• Get – get a custom color pattern saved earlier. The initial custom color is the same as the standard color source, above.
• Save – save the existing color pattern as the custom color pattern.
• Reset – reset the custom color pattern to the default Standard pattern.
Expands or contracts the color range when there are fewer than 15 intervals specified. For example, if 10 intervals are specified and the Dynamic box is not checked, the colors for the intervals are the same as they would be if 15 intervals were checked. If, on the other hand, the Dynamic box is checked, the colors for the intervals are adjusted such that interval 10 becomes the color of the original interval 15. Checking this box provides greater color contrast on maps.
Flips the color range. This allows you to associate the highest interval values with the darkest colors or vice versa.
Exit the dialog window without saving changes.
Exit and save changes.