SimTX API v24/Packets/CoverageMapResponse

CoverageMapResponse

Packet ID	27(0x1B)
Direction	Server → client
Session	Control
Body size	Variable
Permission	None
Answered by
Answers	CoverageMapRequest

CoverageMapResponse returns the predicted received power of a CoverageMapRequest as a global raster, or explains why no prediction is available.

Layout

Field	Type	Description
packetId	u8	Always 27.
requestId	i64	The request this answers.
available	bool	False if no prediction was made. The raster is then empty.
message	UTF	On success: Server propagation prediction. Otherwise the reason.
simTimeEpochMillis	i64	Simulated time the prediction is for, Unix milliseconds. 0 when unavailable.
width	i32	Raster columns.
height	i32	Raster rows.
valueCount	i32	Number of values: width × height, or 0 when unavailable.
receivedPowerDbm	valueCount × f32	Predicted received power in dBm, row by row.

Raster layout

The raster covers the whole globe. Values are stored row-major (index = row × width + column). Row 0 is the northernmost; columns run west to east starting at 180° W. Each value is taken at the centre of its cell:

latitude  =   90 − (row    + 0.5) × 180 / height
longitude = −180 + (column + 0.5) × 360 / width

Each value is the power that a standard receiving antenna (an end-fed half-wave wire at ground level) would see from the requested transmitter, at the simulation's current time, ionospheric state included. Points with no usable path are reported as −200 dBm. Every value is finite.

Unavailable responses

Message	Meaning
Server propagation heatmaps are disabled	The server does not offer coverage prediction.
Coverage prediction server is busy	Another prediction is running and one is waiting. Try again in a few seconds.
Coverage prediction failed; try again	The computation failed.