Linear scales are as the name implies. Every increment between the various levels is the same. Many times the lower threshold is the same as the contour increment but does not have to be.The figure above and illustrates the linear scales definition window, while the table below provides a description of each feature.

Item

Description

 1

Pick list to select the scale to operate on.

 2

Create a new scale. The Scale Creation Dialog in Creating, Copying and Deleting Scales will be displayed to complete the addition.

 3

Copy the scale shown. The Copy Scale Dialog in Creating, Copying and Deleting Scales will be displayed to complete the addition.

 4

Delete the scale shown. The Delete Scale Dialog in Creating, Copying and Deleting Scales will be shown to confirm the deletion.

 5

Indicator shows what type of scale is being displayed. Once a scale is established, its type cannot be changed.

 6

Sets the minimum threshold to show from the measurement data. Note that the basin/polygon averages layer will display anything below this threshold in lowest palette level.

 7

If selected, the program will attempt to determine the lower threshold based on the range of measurements in the dataset. If not selected the value in 6 will be used.

 8

The contour increment to use when displaying the measurement data.

 9

If selected the program will attempt to determine an appropriate contour increment for the range of measurements in the dataset. If not selected the value 8 in will be used.

 10

Sets the maximum threshold to show from the measurement data. Note that the basin/polygon averages layer will display anything above this threshold in highest palette level.

 11

If selected the program will attempt to determine the upper threshold based on the range of measurements in the dataset. If not selected, the value in 10 will be used.

 12

Selecting this will use the entire range of the color palette but will use only the colors that appear on the palette. For example, if the scale has 10 divisions representing values from 1-10 and the palette has 20 color values, then color 1 would be used for values from 1.0-2.0, color 3 would be used for level 2.0-3.0, and so on.

 13

Selecting this is similar to 12  but the color palette is considered a spectrum and colors are derived by taking a proportional color mix using the palette colors adjacent to the scale value when the scale is 'stretched' to match the palette.

 14

If there are more scale values needed for the measurement data than the number of palette levels defined and this is checked, then the last palette item used for contouring will be used for all measurements values exceeding the number of palette items. For example, suppose a scale was designed with a min/increment/max of 0.1/0.1/1.0 respectively giving nine levels to segregate the data into. If there were only 4 contouring palette levels defined for the palette, they would be applied to the first four scale values (0.1 – 0.2), (0.2 – 0.3), (0.3 – 0.4), and (0.4 – 0.5). Any measurement data that extended from (0.5 – 1.0) would use the same palette level as (0.4 – 0.5).

 15

If there are more scale values needed for the measurement data than the number of palette levels defined and this is checked, then the last palette item used for contouring will be used for all measurements values exceeding the number of palette items. For example, suppose a scale was designed with a min/increment/max of 0.1/0.1/1.0 respectively giving nine levels to segregate the data into. If there were only four contouring palette levels defined for the palette they would be applied to the first four scale values (0.1 – 0.2), (0.2 – 0.3), (0.3 – 0.4), and (0.4 – 0.5). Any measurement data that extended from (0.5 – 1.0) would be ignored regardless of the fact the scale extends to 1.0

 16

If more scale values are needed for the measurement data than the number of palette levels defined and this is checked, then the palette items used for contouring will be reused until all measurement data is displayed up to the top of the scale. For example, suppose a scale was designed with a min/increment/max of 0.1/0.1/1.0 respectively giving nine levels to segregate the data into. If there were only 4 contouring palette levels defined for the palette, they would be applied to the first 4 scale values (0.1 – 0.2), (0.2 – 0.3), (0.3 – 0.4), and (0.4 – 0.5). After that the measurement (0.5 – 0.6) would reuse the first palette level, (0.6 – 0.7) would use the second, and so on.

 17

This field shows any inconsistencies in the scale that is being defined.

 18

Accept changes to the scales being defined.

 19

Discard any changes to scales that were made.