Auf Deutsch, weil eh nur für lokale Mapper von Interesse: Das Land Tirol veröffentlicht in seinem WMS nicht nur das aktuelle sondern auch in die Jahre gekommene Luftbilder. Ab und zu ganz praktisch.
Den Absatz unten an geeigneter Stelle (bei den andren maps) in die preferences.xml von JOSM kopieren und eine Reihe alter Orthofotos stehen nach dem nächsten Start als Hintergrundbild zur Verfügung.
<map>
<tag key='projections' value='EPSG:3035,EPSG:3044,EPSG:3045,EPSG:3857,EPSG:4258,EPSG:4326,EPSG:25832,EPSG:25833,EPSG:31254,EPSG:31255,EPSG:31256,EPSG:31257,EPSG:31258,EPSG:31259,EPSG:31287,EPSG:32632,EPSG:32633'/>
<tag key='transparent' value='true'/>
<tag key='minimumTileExpire' value='3600'/>
<tag key='name' value='Tiris: Luftbild'/>
<tag key='type' value='wms_endpoint'/>
<tag key='url' value='https://gis.tirol.gv.at/arcgis/services/Service_Public/orthofoto/MapServer/WmsServer'/>
<tag key='attribution-text' value='tiris.tirol.gv.at'/>
<tag key='attribution-url' value='https://tiris.tirol.gv.at/'/>
<tag key='permission-reference-url' value='https://www.data.gv.at/katalog/dataset/35691b6c-9ed7-4517-b4b3-688b0569729a'/>
<tag key='country-code' value='AT'/>
<tag key='cookies' value=''/>
<tag key='bounds' value='46.6487342,10.0922445,47.7538216,12.9797402'/>
<tag key='shapes' value='47.5976781,10.4399766,47.5992486,10.4788646,47.5865589,10.5027725,47.5597936,10.4837986,47.5434951,10.513122,47.5458237,10.5717689,47.5621216,10.570044,47.5807415,10.6010923,47.5691048,10.6390403,47.5702686,10.7080366,47.5493166,10.7114864,47.5504808,10.7684083,47.5260267,10.7856574,47.5504808,10.8960515,47.5236971,10.9357244,47.5050569,10.9339995,47.4957344,10.8908768,47.4910724,10.9512486,47.4677567,10.9546984,47.4327637,11.0029958,47.4082547,10.9909215,47.4047525,11.1030405,47.4199271,11.1151148,47.4455971,11.2099847,47.4409308,11.2686316,47.4105894,11.2669067,47.4420974,11.2945052,47.4607599,11.3307283,47.4584275,11.3824755,47.4759184,11.3704012,47.5306855,11.4393975,47.5178728,11.466996,47.5236971,11.5739403,47.5586296,11.5756652,47.5912123,11.598089,47.6063331,11.6343121,47.5947021,11.6688102,47.602844,11.7930036,47.5923756,11.8395761,47.6109847,11.8499255,47.6365615,12.0068922,47.6249373,12.0362156,47.6272623,12.0776134,47.6191242,12.1086617,47.6226121,12.1949071,47.6876775,12.1535093,47.7166984,12.158684,47.7120562,12.1811078,47.7248214,12.2190558,47.7538216,12.2414796,47.7515022,12.272528,47.7317829,12.2846023,47.695805,12.2656283,47.7108955,12.3363495,47.695805,12.3760224,47.7027704,12.4432938,47.692322,12.4536433,47.6749032,12.4536433,47.6319121,12.5105652,47.6458591,12.5312641,47.6342369,12.589911,47.6109847,12.5795615,47.5947021,12.6658069,47.5749235,12.6796062,47.5504808,12.645108,47.5318501,12.6675318,47.5038917,12.6847809,47.4817474,12.7123795,47.4560949,12.6675318,47.4595937,12.6416582,47.443264,12.6502828,47.4070873,12.6209593,47.3860701,12.5743868,47.3965797,12.5502381,47.3720539,12.4915913,47.3510227,12.5088403,47.3206295,12.4881414,47.322968,12.4346693,47.3042567,12.4139704,47.3089351,12.3639481,47.3276449,12.3122008,47.298408,12.2708031,47.2937286,12.177658,47.2843686,12.1483346,47.2995778,12.1172863,47.2750069,12.0983123,47.2504245,12.1259108,47.1977096,12.0965874,47.1484618,12.1103866,47.109735,12.141435,47.0897738,12.1379852,47.0756791,12.1500595,47.0439523,12.0051672,47.0298454,11.9206468,46.9910324,11.8309516,46.9863258,11.7878289,46.9674955,11.7740296,46.9651413,11.7309069,46.9898558,11.7067582,46.994562,11.6429366,47.0051495,11.6118883,46.9780884,11.5325425,47.0086782,11.4928696,46.9674955,11.4445722,46.9616097,11.4048993,46.9863258,11.3445276,46.9569006,11.2030851,46.9616097,11.1754866,46.9439484,11.1772115,46.922747,11.1461632,46.922747,11.1254643,46.9038944,11.1082152,46.8885717,11.1151148,46.853195,11.0823416,46.8236966,11.0961408,46.8024477,11.0512932,46.762288,11.0236947,46.7705586,10.9184753,46.7575613,10.8839772,46.7729214,10.8408545,46.7693772,10.8236054,46.7894581,10.7908322,46.778828,10.756334,46.7906391,10.7252857,46.8272372,10.7477095,46.8449371,10.6942373,46.869707,10.6735384,46.853195,10.6079919,46.8272372,10.5545198,46.8390378,10.5200216,46.8366779,10.4682744,46.8814982,10.4510253,46.9321709,10.475174,46.9557232,10.4130773,46.9886791,10.3941034,46.9804421,10.3665048,46.9474811,10.3389063,46.9180345,10.3285569,46.9133215,10.2975085,46.9251032,10.2595605,46.8626311,10.2388617,46.8390378,10.1664155,46.8472966,10.1353672,46.8720655,10.1319174,46.886214,10.1060438,46.9274592,10.0922445,46.952191,10.1250177,47.0004442,10.1457166,47.0251423,10.1129434,47.0498291,10.1526163,47.0627556,10.1301925,47.0909482,10.1336423,47.126168,10.1595159,47.1425959,10.2009137,47.2000536,10.1922891,47.2129438,10.2095382,47.2398857,10.1871144,47.2562785,10.2009137,47.2633024,10.1681404,47.2808581,10.1681404,47.2913887,10.2026386,47.2890488,10.2440364,47.3206295,10.3337316,47.3907413,10.3889286,47.3942444,10.4148022,47.436264,10.4562,47.4817474,10.4475755,47.5050569,10.419977,47.5551374,10.4424008,47.5714324,10.4130773,47.5976781,10.4399766;47.1601916,12.401896,47.1390761,12.3570484,47.1120829,12.3501488,47.107387,12.3104759,47.0721548,12.2552789,47.0592305,12.2138811,47.0263181,12.2000818,47.0310212,12.1448848,47.007502,12.1155613,46.9592552,12.1362602,46.9357044,12.1673086,46.9109649,12.1431599,46.9003588,12.1897324,46.8661692,12.2173309,46.8838562,12.2552789,46.8826772,12.2742529,46.8343179,12.2984016,46.8201557,12.2759778,46.7776467,12.2794276,46.77174,12.3501488,46.7150029,12.3811972,46.6842454,12.4432938,46.6700437,12.5140151,46.6487342,12.5657623,46.6534704,12.6295839,46.6534704,12.70203,46.6984434,12.7037549,46.7008093,12.7296285,46.7374685,12.7227289,46.7492887,12.8020747,46.744561,12.8538219,46.77174,12.9038442,46.7599247,12.9279929,46.7764654,12.9573164,46.7977246,12.9797402,46.8331378,12.8952197,46.8484763,12.8952197,46.8638104,12.8451974,46.9156781,12.8469223,46.930993,12.7968999,46.9474811,12.7882754,46.9686726,12.7486025,46.9969149,12.7365282,47.0416014,12.7813758,47.0510043,12.7624018,47.0451277,12.7141044,47.0780285,12.7106545,47.126168,12.6226842,47.1414227,12.5692121,47.1332091,12.551963,47.154327,12.5260894,47.1648828,12.4829667,47.1484618,12.4605429,47.1578459,12.4346693,47.1437691,12.4191451,47.1601916,12.401896'/>
<tag key='icon' value='data:image/png;base64,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'/>
<tag key='customHttpHeaders' value='{}'/>
<tag key='category' value='photo'/>
</map>
In der Baumstruktur sind es dann die “Image_…” Einträge: zB. 1970 ganz retro in schwarzweiß, 2004 mit auch in Schatten noch gut sichtbaren Details.
PS: So richtig Historische Karten gibt es hier
…