Solid Underlay Regions
An underlay is a range with outer boundaries, a filled area, and a color number specifying the color to use for the filled area.
We use the term underlay to indicate that this color is visible only when there is thresholded radar data, so it seems to be under the data.
Overlay starts from each of the specified fill points and fills all contiguous areas, stopping at overlay lines. You can enter many fill points for the same filled region. This is required for a coastline with deep bays, so that the region fills correctly at all scales.
Many overlays contain coastline and use a blue underlay for ocean. To prevent the filled color from leaking around the edge of the overlay limits, use the RANGE command to tell Overlay how far you have drawn your overlay.
| Statement | Description |
|---|---|
| FILL_COLOR color |
Sets the color of the underlay region. Color should be |
| FILL x y | Marks the starting point for the fill area. |