グライダーのフライトログに使用される.igcファイルの解説

グライダーなどのフライトログに使われる.igcファイルについて解説する

.igcファイルとは
.igcファイルの概要とrecordの構成
B record
ファイル名
A record
H record
I record / J record
E record
K record
おわりに

.igcファイルとは

.igcファイルとは，IGC（International Gliding Commission）によって定められたグライダーなどの飛行を記録するためのテキストファイルの形式である

↓IGCについて

Each type of IGC Flight Recorder has an IGC-approval document that gives details of the Recorder, its hardware, internal...

IGC (file format) - Wikipedia

↓公式ドキュメント

[PDF] igc_fr_specification_with_al8_2023-2-1.pdf (1366 KB)
(p.20 Appendix A – The IGC Data File Standard 以降が参考になる)

↓英語の解説（有志）

IGC FILE FORMAT REFERENCE AND DEVELOPERS' GUIDE - Ian Forster-Lewis

この記事では，.igcファイルの中身の解読方法について説明する

.igcファイルの概要とrecordの構成

実際の.igcファイルはこんな感じ

AXNA9AD179D6D6F04DDD95474658245E6D4F
HFDTEDATE:180223,01
HFPLTPILOTINCHARGE:mtkbirdman
HFCM2CREW2:NIL
HFGTYGLIDERTYPE:G103a Twin Astir II
HFGIDGLIDERID:JA9999
HFDTMGPSDATUM:WGS84
HFRFWFIRMWAREVERSION:2.8.1+1647
HFRHWHARDWAREVERSION:Apple iPhone,Ios 16.2
HFFTYFRTYPE:Naviter,SeeYou Navigator
HFGPSRECEIVER:Unknown,Internal,0,0
HFPRSPRESSALTSENSOR:Unknown,Internal,0
HFALGALTGPS:ELL
HFALPALTPRESSURE:ISA
HFCIDCOMPETITIONID:NKN
HFCCLCOMPETITIONCLASS:NKN
HFTZNTIMEZONE:9.0
J020810WDI1113WSP
LXNA::VEHICLE:0
LXNA::LOGSTART,GSP,VARIO
LXNA::PHASE:onGround
E013830ATS102415
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B0146354901776N00234156EA0023200118
B0146364901773N00234172EA0023200117
B0146374901772N00234195EA0023200115
B0146384901773N00234212EA0023200113
B0146394901773N00234229EA0023200111
B0146404901772N00234251EA0022900109
B0146414901774N00234267EA0022700108
B0146424901775N00234282EA0022500107
B0146434901775N00234298EA0022400107
B0146444901773N00234312EA0022200108
B0146454901774N00234327EA0022100108
B0146464901763N00234338EA0022000109
B0146474901748N00234349EA0022000110
B0146484901734N00234357EA0022000112
B0146494901720N00234364EA0022000114
B0146504901705N00234370EA0022000114
B0146514901690N00234374EA0022000115
B0146524901676N00234380EA0021900116
B0146534901661N00234384EA0021900117
B0146544901646N00234388EA0021800118
B0146554901631N00234391EA0021700119
B0146564901617N00234396EA0021600120
B0146574901602N00234399EA0021600119
B0146584901587N00234402EA0021600120
B0146594901572N00234407EA0021600120
B0147004901557N00234410EA0021500121
B0147014901542N00234412EA0021400120
B0147024901527N00234412EA0021300119
B0147034901513N00234410EA0021200119
B0147044901499N00234408EA0021100119
B0147054901485N00234401EA0021000119
B0147064901473N00234393EA0020800119
B0147074901462N00234383EA0020800119
B0147084901453N00234372EA0020700120
B0147094901445N00234358EA0020700121
B0147104901439N00234346EA0020700119
B0147114901437N00234330EA0020400115
B0147124901436N00234315EA0020100111
B0147134901435N00234299EA0019700109
B0147144901434N00234283EA0019200108
B0147154901432N00234267EA0018600107
B0147164901424N00234251EA0018300106
B0147174901423N00234236EA0017900104
B0147184901423N00234220EA0017600102
B0147194901423N00234203EA0017300101
B0147204901422N00234185EA0017000100
B0147214901421N00234169EA0016700100
B0147224901421N00234152EA0016300100
B0147234901420N00234137EA0015700102
B0147244901420N00234121EA0015400102
B0147254901420N00234104EA0015200102
B0147264901419N00234089EA0015000102
B0147274901418N00234074EA0014900100
B0147284901418N00234058EA0014700099
B0147294901417N00234041EA0014400098
B0147304901416N00234025EA0014200097
B0147314901415N00234009EA0013900096
B0147324901413N00233994EA0013600094
B0147334901412N00233978EA0013300093
B0147344901411N00233961EA0013000092
B0147354901410N00233945EA0012600093
B0147364901409N00233930EA0012300094
B0147374901408N00233915EA0012000096
B0147384901407N00233899EA0011700097
B0147394901406N00233886EA0011500099
B0147404901407N00233871EA0011400106
B0147414901407N00233859EA0011300109
B0147424901408N00233847EA0011300113
B0147434901408N00233835EA0011300115
B0147444901408N00233826EA0011300117
B0147454901407N00233816EA0011400118
B0147464901406N00233806EA0011400119
B0147474901405N00233798EA0011500120
B0147484901403N00233789EA0011500120
B0147494901403N00233781EA0011500121
B0147504901401N00233773EA0011500121
B0147514901400N00233766EA0011600121
B0147524901399N00233761EA0011600122
B0147534901398N00233755EA0011600122
B0147544901397N00233748EA0011600122
B0147554901397N00233743EA0011700122
B0147564901396N00233737EA0011700121
B0147574901396N00233733EA0011700121
B0147584901395N00233728EA0011700121
B0147594901394N00233724EA0011700121
B0148004901394N00233719EA0011700120
B0148014901393N00233715EA0011800120
B0148024901393N00233710EA0011800120
B0148034901392N00233708EA0011800120
B0148044901391N00233704EA0011800120
B0148054901391N00233701EA0011800120
B0148064901391N00233699EA0011800120
B0148074901391N00233697EA0011800119
B0148084901390N00233694EA0011800119
B0148094901390N00233693EA0011800119
B0148104901390N00233692EA0011800119
B0148114901390N00233691EA0011800119
B0148124901391N00233691EA0011800119
B0148134901391N00233690EA0011800119
B0148144901391N00233689EA0011800119
B0148154901391N00233689EA0011800119
B0148164901391N00233687EA0011800119
B0148174901391N00233687EA0011800119
B0148184901391N00233687EA0011800119
B0148194901390N00233687EA0011800118
B0148204901390N00233687EA0011800119
B0148214901390N00233687EA0011800119
LXNA::LOGSTOP
LXNA::PHASE:onGround
G0089F458A95684AE250AC7B8DA396BC8E433EE2D84F50902C8641C5BD35688A7952D56
G798F3A2F480A436464D87A7F556F35AAA7D09A5C7E742970CEF5D264A5A8
LXCM::TKOFFLAND:1,20230218014008,20230218014821
LXCM::TKOFFLANDALT:1,90,48
LXCM::SOARINGBEGIN:1,20230218014049,430
LXCM::OPT:1,3,6664,5,7348,5,7348
LXCM::TRIANGLE:1,FAI_NO,6632,-16384
LXCM::FLTSTAT1:1,14.91,-0.81,21.30,438,261,31.85
LXCM::FLTSTAT2:1,20230218014036,20230218014027
LXCM::FLTVARIO:1,20,18.44,20230218014013,-5.56,20230218014715
LXCM::ENDINFO

.igcファイルはA recordからL recordまでの12種類の記録項目があり，各行の１文字目を見ればその行が何を記録しているか判別することができる

A～Lまでのrecordで記録される内容は以下の通り

record type	説明
A	Flight Record（FR）の製造者とFRのシリアル番号
B	毎時取得する基本データ（時刻，緯度/経度，高度）
C	？
D	？
E	イベント
F	B recordに使用される衛星の情報
G	記録の改竄などを防止するセキュリティ記録
H	ファイルのヘッダー
I	B recordに追加して取得するデータの設定
J	K recordで取得するデータの設定
K	Bよりも低い頻度で取得する情報
L	コメントアウトみたいなもの

原文

igc_fr_specification_with_al8_2023-2-1.pdf (1366 KB) p.21

基本的にパイロットが知りたいのはB recordの情報で，それ以外のrecordは別に無視しても構わない

上記のレコードは，通常以下のような順番でファイルに記述される

A - Flight Record（FR）の製造者とFRのシリアル番号 (必ず１行目)
H - ファイルのヘッダー (２行目以降に記述される)
I - B recordに追加して取得するデータの設定（任意）
J - K recordで取得するデータの設定（任意）
C, D - ？（任意）
F - B recordに使用される衛星の情報

B - 毎時取得する基本データ（時刻，緯度/経度，高度）
B - 毎時取得する基本データ（時刻，緯度/経度，高度）
:
E - イベント（任意）
B - 毎時取得する基本情報（時刻，緯度/経度，高度）
K - J recordで設定されたデータ（デフォルトで２０秒間隔）
B - 毎時取得する基本情報（時刻，緯度/経度，高度）
:

L - コメントアウト（任意）
G - セキュリティ記録
L - 飛行終了時に追加されるデータ

なお，.igcファイルで用いられる時刻はUTC（協定世界時）である

原文

igc_fr_specification_with_al8_2023-2-1.pdf (1366 KB) p.25

まずは１番重要なB recordから説明する

それ以外はおまけみたいなもんである

B record

B0140344901436N00233075EA0050500372

B recordは以下のデータで構成されている

B HHMMSS DDMMmmmN/S DDDMMmmmE/W A/V PPPPP GGGGG

B：B record
HHMMSS：UTCによる時刻
DDMMmmmN/S：緯度
DDDMMmmmE/W：経度
A/V：３次元データ/２次元データ
PPPPP：ISA 1013.25 HPaに対する気圧高度 [m]
GGGGG：WGS84楕円体からの高度 [m]

上記の例のB record「B 014034 4901436N 00233075E A 00505 00372」は以下のような意味になる

B：B recordとして記録される
014034：1時40分34秒（UTC）
4901436N：北緯49度01.436分
00233075E：東経2度33.075分
A：3次元データ
00505：気圧高度505m
00372：WGS84楕円体からの高度372m

igc_fr_specification_with_al8_2023-2-1.pdf (1366 KB) p.32

ファイル名

2023-02-22-XNA-9AD179D6D6F04DDD95474658245E6D4F-01.igc

ファイル名は以下のデータで構成されている

YYYY-MM-DD-MMM-XXXXXX-01.igc

YYYY：年
MM：月
DD：日
MMM：製造者コード
XXXXXX：固有のFRシリアルID
01：その日のフライトの通し番号

例にあげたログは「See you Navigator」のiPhoneアプリで記録したものなので，製造者はXNA（Naviter Hyper）になっている

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A record

AXNA9AD179D6D6F04DDD95474658245E6D4F

A recordは以下のデータで構成されている

A MMM XXXXXX

A：A record
MMM：製造者コード
XXXXXX：固有のFRシリアルID

H record

HFDTEDATE:220223,01
HFPLTPILOTINCHARGE:mtkbirdman
HFCM2CREW2:NIL
HFGTYGLIDERTYPE:G103a Twin Astir II
HFGIDGLIDERID:JA9999
HFDTMGPSDATUM:WGS84
HFRFWFIRMWAREVERSION:2.8.1+1647
HFRHWHARDWAREVERSION:Apple iPhone,Ios 16.2
HFFTYFRTYPE:Naviter,SeeYou Navigator
HFGPSRECEIVER:Unknown,Internal,0,0
HFPRSPRESSALTSENSOR:Unknown,Internal,0
HFALGALTGPS:ELL
HFALPALTPRESSURE:ISA
HFCIDCOMPETITIONID:NKN
HFCCLCOMPETITIONCLASS:NKN
HFTZNTIMEZONE:9.0

H recordは以下のデータで構成されている

H F/O CCC CCCCCC: text strings

H：H record
F/O：データソース（F：Flight record，O：Others）
CCC：項目の３文字略称（TLC：Three letter Code）
CCCCCC：項目名（文字数任意）
text strings：任意の文字列

大事そうなものを説明する

H record	説明
H F DTE DATE: DDMMYY, NN	フライトの日付，通し番号
H F PLT PILOT IN CHARGE: TEXT STRING	パイロットの名前
H F GTY GLIDER TYPE: TEXT STRING	機種
H F GID GLIDER ID: TEXT STRING	機体の登録番号
H F DTM GPS DATUM: WGS84	GPSに使用している測地系
H F RHW HARDWARE VERSION: TEXT STRING	GPSに使用した機器
H F FTY FR TYPE: MANUFACTURERS NAME,FR MODEL NAME	製造者名，Flight recordモデル