Editing SimTX API/Packets/WeatherMapResponse (section)

== Raster layout ==
Values are stored row-major (<code>index = row × width + column</code>) and sampled at grid '''nodes''' that include the edges of the area:

<syntaxhighlight lang="text">
latitude  = north − (north − south) × row    / (height − 1)
longitude = west  + (east  − west ) × column / (width  − 1)
</syntaxhighlight>

Row 0 is the northern edge and the last row the southern edge; columns run west to east. North and south are clamped to ±90°. When the area crosses the antimeridian, <code>west_longitude_deg</code> is greater than <code>east_longitude_deg</code>; add 360° to the eastern edge before interpolating. For a 360° span the two edges are equal.

Raster values are always finite. The duct summary fields may be NaN as described in the field table.