4-Grid Composite

Use the Grid and Image > Display on Map > 4-Grid Composite menu option (GRIDIMG4 GX) to place an aggregate of 4 grid images on a map.

4-Grid Composite dialog options

Colouring method

Select the colour method as one of the following options: As last displayed, Default, Histogram equalization, Normal distribution, Linear, Log-linear.

  • The method "As last displayed" will display each grid as it was displayed the last time the grid was viewed, and the colour tables will be ignored.
    If the selected colour scheme is an .itr file or a .zon file, the colours are already attributed to data ranges, and this entry remains disabled.

    • Script Parameter: GRIDIMG4.ZONE

    Grid name 1

    first grid name

    Script Parameter: GRIDIMG4.GRID1

    Colour table 1

    Select the colour scheme for rendering the image of the first grid. If you mouse over the colour scheme entry, a tooltip will display the name of the colour table in its folder. To modify the selection, click on the colour entry and then navigate through the scheme categories.

    Script Parameter: GRIDIMG4.COLOR1

    Grid name 2

    Second grid name

    Script Parameter: GRIDIMG4.GRID2

    Colour table 2

    Select the colour scheme for rendering the image of the second grid. If you mouse over the colour scheme entry, a tooltip will display the name of the colour table in its folder. To modify the selection, click on the colour entry and then navigate through the scheme categories.

    Script Parameter: GRIDIMG4.COLOR2

    Grid name 3

    Third grid name

    Script Parameter: GRIDIMG4.GRID3

    Colour table 3

    Select the colour scheme for rendering the image of the third grid. If you mouse over the colour scheme entry, a tooltip will display the name of the colour table in its folder. To modify the selection, click on the colour entry and then navigate through the scheme categories.

    Script Parameter: GRIDIMG4.COLOR3

    Grid name 4

    Fourth grid name

    Script Parameter: GRIDIMG4.GRID4

    Colour table 4

    Select the colour scheme for rendering the image of the fourth grid. If you mouse over the colour scheme entry, a tooltip will display the name of the colour table in its folder. To modify the selection, click on the colour entry and then navigate through the scheme categories.

    Script Parameter: GRIDIMG4.COLOR4

    Render method

    Select the render method.

    ADD - All the colours are added together.

    BLEND – All the colours are added then divided by the number of valid (non-dummy) colours.

    BLEND EQUAL – All the colours are added then divided by the number of colours.

    Script Parameter: GRIDIMG4.METHOD

    Application Notes

    Click the New Map button to display a grid on a new map. Click the Current Map button to display the grid on the current map. (For script file, set Script Parameter: GRIDIMG4.NEW to 1 to create a new map; 0 to use current map)