OpenSeaMap-dev:.SON (Humminbird) - Versionsgeschichte

Markus: /* Data */

2025-01-24T21:53:45Z

‎Data

Markus: Markus verschob die Seite SON nach OpenSeaMap-dev:.SON (Humminbird)

2020-12-06T16:35:13Z

Markus verschob die Seite SON nach OpenSeaMap-dev:.SON (Humminbird)

Cleanerx: /* Basic Structure */

2013-05-02T07:46:50Z

‎Basic Structure

Cleanerx am 2. Mai 2013 um 06:37 Uhr

2013-05-02T06:37:46Z

Cleanerx am 2. Mai 2013 um 06:37 Uhr

2013-05-02T06:37:26Z

Cleanerx: /* DAT File */

2013-05-02T06:32:33Z

‎DAT File

Cleanerx: /* Header */

2013-05-01T20:15:28Z

‎Header

Cleanerx: Die Seite wurde neu angelegt: „SON is a file format that is used by Humminbird instruments. It structure allows to store data from several sonar sensors to allow for storing so called side s…“

2013-05-01T20:10:34Z

Die Seite wurde neu angelegt: „SON is a file format that is used by Humminbird instruments. It structure allows to store data from several sonar sensors to allow for storing so called side s…“

Neue Seite

SON is a file format that is used by Humminbird instruments. It structure allows to store data from several sonar sensors to allow for storing so called side scan data. Side scans are continous depth measurments not only below the ship but to some extent to the side of the ships.

= Basic Structure =

Byte order of data is most significant byte is the first byte in the stream.

== DAT File ==
For each recording a numbered file is created starting with R00001.DAT. That files stores general information such as time and date of recording and initial position. A corresponding directory R00001 holds a list of files that contain sonar sensor recordings. For earch sensor an index file and a data file is created. A multiple sensor setup may look like having a 50kHz, a 200kHz and two 455kHz side scan sensors for each side of the ship. This will result in four sensor files and four index files totalling to 8 files.

== Index Files ==
Index files contain allow to identify headers and subsequent data in the son file

typedef struct indexstructure
{
int32_t globalRecordNumber; // record number
int32_t positionInStream; // start of header in other file
}

== SON Files ==
Having analyzed the index structure one can access the positions in the file directly.
The header consists of a sequence of control characters that indicate the following data (indicated as signed byte value).

=== Header ===
<pre>
-128 : int32 // global record number
-127 : int32 // recording time since start
-126 : int32 // longitude (projected)
-125 : int32 // latitude (projected)
-124 : int16 : gps enabled (0/1); int16 : gps heading to be divided by 10.0
-123 : 2 unused bytes; int16 gps speed to be divided by 10.0
-122 : 4 bytes // unknown
-121 : int32 : depth in decimeter
-110 : int32 : sensor frequency in Hz (e.g. 85000Hz)
-107 : int32 // unknown
-96 : int32 // data length for this data block following the header

80 : byte : Beam id (0 for first beam, 1 for second beam, ... encodes the same id as the file name)
81 : byte // unknown
83 : byte // unknown
84 : byte // unknown
86 : byte // unknown
87 : byte // unknown
33 : header termination
</pre>

=== Data ===
Yet to be discovered or documented

← Nächstältere Version		Version vom 24. Januar 2025, 21:53 Uhr
Zeile 58:		Zeile 58:
	=== Data ===		=== Data ===
	Yet to be discovered or documented		Yet to be discovered or documented
		+
		+
		+	[[Kategorie:Depth]]

@@ Zeile 8: / Zeile 8: @@
 For each recording a numbered file is created starting with R00001.DAT. That files stores general information such as time and date of recording and initial position. A corresponding directory R00001 holds a list of files that contain sonar sensor recordings. For earch sensor an index file and a data file is created. A multiple sensor setup may look like having a 50kHz, a 200kHz and two 455kHz side scan sensors for each side of the ship. This will result in four sensor files and four index files totalling to 9 files including the dat file.
 bytes : unknown
 int32 : seconds (NOT milliseconds) since January 1, 1970, 00:00:00 GMT.
@@ Zeile 14: / Zeile 15: @@
 bytes[6] : Name
 bytes[4] : Extension
 == Index Files ==

← Nächstältere Version	Version vom 6. Dezember 2020, 16:35 Uhr
(kein Unterschied)

@@ Zeile 3: / Zeile 3: @@
 = Basic Structure =
-Byte order of data is most significant byte is the first byte in the stream.
+Byte order of data is most significant byte is the first byte in the stream (Big Endian).
 == DAT File ==

@@ Zeile 44: / Zeile 44: @@
 : header termination
 </pre>
 === Data ===
 Yet to be discovered or documented