Glossary entry

French term or phrase:

éclairage rasant

English translation:

raking (sun)light

Added to glossary by Christopher Crockett
May 10, 2006 14:26
18 yrs ago
French term

éclairage rasant

French to English Science Archaeology aerial archaeology
La méthode utilisée met à profit l'observation des anomalies qu'entraîne l'existence de terrassements anciens et de vestiges enfouis : couleur des terres labourées, croissance ou teinte différentielle des végétaux, ombres portées en ***éclairage rasant***, traces d'humidité….
Proposed translations (English)
5 +4 raking (sun)light
4 +2 oblique light
3 +1 low-angle lighting

Proposed translations

+4
4 mins
Selected

raking (sun)light

..

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Note added at 11 mins (2006-05-10 14:38:15 GMT)
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Generally speaking, aerial photography is most effective when done during the early morning or late afternoon, when the sun hits the land at an acute angle rather than from directly overhead, causing the creation of shadows cast by topographic features which project above the normal ground level.

These features can be such things as the remains of ancient walls which may be covered by subsequent soil deposits, hardly visible from the surface --where they appear as just little "bumps"-- but when seen in raking sunlight can clearly be distinguished as man-made features, the outline of buildings.

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Note added at 37 mins (2006-05-10 15:04:21 GMT)
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Some examples of photography under raking light conditions:

http://www.culture.gouv.fr/fr/arcnat/aerien/en/indice2-pg2.h...

http://www.culture.gouv.fr/fr/arcnat/aerien/en/discip2-pg2.h...

http://www.mfa.org/exhibitions/sub.asp?key=15&subkey=612

http://www.ramagazine.org.uk/index.php?pid=119

http://www.oldhouseweb.com/stories/Detailed/270e.shtml

http://graphics.stanford.edu/projects/mich/forma-urbis/

http://graphics.stanford.edu/projects/mich/forma-urbis/a214-...

http://graphics.stanford.edu/projects/mich/forma-urbis/a214-...

http://graphics.stanford.edu/projects/mich/forma-urbis/a2140...



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Note added at 59 mins (2006-05-10 15:26:53 GMT)
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Sorry, my Google was for "raking light" + "aerial photography", vs. "oblique light" + "aerial photography".

Head to head, a simple search for "raking light" looses out to "oblique light", 24,200 to 28,400.

Pass your cursor over the second .jpg on this page and see how much detail can be seen in an aerial photograph taken under raking light conditions:

http://www.culture.gouv.fr/fr/arcnat/aerien/en/discip2-pg2.h...

More raking light photos from the same site:

http://www.culture.gouv.fr/fr/arcnat/aerien/en/discip2-pg3.h...

http://www.culture.gouv.fr/fr/arcnat/aerien/en/discip2-pg4.h...

And the Aerial Archeologist at work:

http://www.culture.gouv.fr/fr/arcnat/aerien/imgs/nadar.jpg
Peer comment(s):

agree SusanMurray : yes! raking sunlight is often used
2 mins
Thanks, Susan.
agree Dr Sue Levy (X)
3 mins
Thanks, Sue.
agree Bourth (X) : Appears to be more common than "oblique"
6 mins
Only marginally. Google "raking light" = 152 hits; "oblique light" - 103. Both are right, "oblique" just a bit more technical to the ear. Thanks, Bourth.
agree Kim Hooper
10 mins
Thanks, Kim.
Something went wrong...
4 KudoZ points awarded for this answer. Comment: "Many thanks to all. "
+2
7 mins

oblique light

In addition, earthworks such as banks and ditches can also be photographed under oblique light conditions (shadow marks). Although crop and soil marks were ...
www.bbc.co.uk/history/lj/ archaeologylj/popup_aerial_survey.html

Archaeology. A Corpus of Early Medieval Inscribed Stones and Stone ... angle so as to produce oblique light across the carving (Gray & Ferguson 1997, 8-13). ...
www.bangor.ac.uk/history/site_english/ research/res_projects/archaeology/stones/index.htm

Oblique light can show reduced topography of sites invisible from the ground. ...
www.reference-wordsmith.com/ cgi-bin/lookup.cgi?exact=1&terms=site

And suddenly, in the oblique light, Christine and I could see the wagon-wheel ruts of ... He writes about archaeology for the The New Yorker, Smithsonian, ...
www.nmoca.org/CuartoCentenario/theroyalroad.html
Peer comment(s):

agree Christopher Crockett : A bit more technical than my "raking". Alas, I can't seem to get your first three links to work, and the fourth doesn't have an aerial shot, but roads would show up in a raking light as well as walls.
8 mins
agree Tony M : [try copying & pasting them, Chris --- it's those spurious spaces that usually mess things up if you just click on them]
13 mins
Something went wrong...
+1
20 mins

low-angle lighting

I think friend Bourth has got the definitive answer, but you might just like to consider this as an alternative, or if you need to 'ring the changes'. It's certainly often used in fields outside archaeology.

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Note added at 22 mins (2006-05-10 14:49:03 GMT)
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Or of course 'low-angle sunlight'
Peer comment(s):

agree Bourth (X) : Actually that's what I started off researching, before preferring "oblique"
2 hrs
Cheers, Alex! Of course, I'm coming to this from a cinema lighting viewpoint...!
Something went wrong...
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