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CPT Help Home -> Specific Menu Items -> Tools -> Climatological Maps -> Thresholds ThresholdsMaps showing the values of the thresholds to define the above- and below-normal categories are shown. By default the thresholds are calculated as the terciles from the climatological period, but can be reset using Options ~ Tailoring. The map titles can be changed by right-clicking on the image and then selecting the "Customise" option. The maps can be saved individually or as a montage as a BMP, EMF, GIF, JPEG, PCX, or PNG file by right-clicking anywhere in the child window and selecting Export from the pop-up menu. A default name is given to the graphic file, but this name can be changed using the browse button. The quality of the JPEG file can be adjusted using the slider or by the quality indicator, which ranges between 0.01 and 1.00. The highest quality is obtained using 1.00. The size of the JPEG file is affected by the quality chosen, with larger files being generated the higher the selected quality. The image quality for all the graphics formats can be improved by increasing the size of the image (see Options ~ Graphics ~ Graph Scaling). The thresholds can be saved by using the Climatologies tab in File ~ Output Results.
There is some flexibility to adjust the colour scaling: the colour bar limits can be set by right-clicking on the image and
then selecting the Customise ~ Contour Limits option. A window opens that indicates the assumed maximum and minimum data
values when setting the colour intervals and number of colours. These values can be reset, which will in turn automatically
reset the colour interval and number of colours. Greater flexibility for setting the colour scalings is planned for future
releases. Further options for customizing the maps, including adjusting the size of the fonts, and the size of the images,
plus masking of land or lake areas are available from Options ~ Graphics.
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