Proceedings of Symposium on Remote Sensing and Photo Interpretation: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Bibliographic data

Multivolume work

Persistent identifier:: 842147969

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 842147969

Language:: German

Other Title:: Nebentitel: Proceedings : Symposium on Remote Sensing and Photo Interpretation

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Document type:: Multivolume work

Volume

Persistent identifier:: 842148353

Title:: Proceedings of Symposium on Remote Sensing and Photo Interpretation

Sub title:: October 7 - 11, 1974, Banff, Alberta, Canada

Scope:: VII Seiten, Seiten 469 - 878

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 842148353

Illustration:: Illustrationen, Diagramme, Karten

Signature of the source:: T 15 B 1306

Language:: German

Additional Notes:: Literaturangaben

Usage licence:: Attribution 4.0 International (CC BY 4.0)

Corporations:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Adapter:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Founder of work:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Other corporate:: Symposium on Remote Sensing and Photo Interpretation, 1974, Banff, Alberta; International Society for Photogrammetry, Commission Interpretation of Data; Canadian Institute of Surveying

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2015

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: SPECIAL APPLICATIONS CHAIRMAN. - S. SCHNEIDER

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: TECHNIQUES OF AERIAL ARCHEOLOGY. Thomas Eugene Avery

Document type:: Multivolume work

Structure type:: Chapter

- 475 - ised by shadows ‘ masking of :h dormant-season is plants are The best time for photographing soil marks is during the winter or spring when there is little or no crop vegetation. The weather is important only in the case of very weak marks, which are best exposed on panchromatic films during dry periods. Where infrared imagery is specified, flights during wetter periods may be quite satisfactory, however. ; old field sys- > define owner- iry by the two ¡emnants of these by shadow marks. Although the more significant discoveries revealed by soil marks have been in the more arid regions, important discoveries have also occurred in humid areas. In certain sections of England, such as the Fen Basin and chalk regions, soil marks have revealed numerous remains of previous landscapes. And similar markings have also served to outline buried ditches enclosing ancient Roman fields. shadow marks. It Indian village .a. The site con- i more than a ; broad, low ;d for many years Crop or Plant Marks Cultivated crops and native plants (e.g., grasses), may reveal the exis tence of buried landscapes by variations in their color, density or height. Such variations, which may indicate differences in plant-root penetration, can result from the remains of such features as ditches, pits, or buried wall frag ments. Plant marks may reappear year after year, since the causal buried re mains may lie well below all cultivation levels. ind moisture of ihes, depressions, .le has been so ¡sent surface soil, efinitive, even .1 marks may per- ition, and to de aerations of l beds may also Crop or plant marks may be classed as either positive or negative. Posi tive marks result where growth is stimulated by filled-in ditches, whereas negative marks (inhibited growth) can result from buried foundations and walls. Positive marks are the more common type. They are affected by the width and depth of the original excavation in the subsoil and are most pronounced when the excavation was large and deep. The minimum width required to produce a plant mark is probably about one meter. However, a plant or crop mark will seldom be as wide as the ditch or other feature beneath it. To produce positive plant marks, the subsoil must be well drained. Thus during dry periods, plants growing in deeper soil will be the only ones to :tor in producing urface soils, ntrasts strongly ed. flourish. Marks may not be present in areas with loose subsoils, because the roots of crops may extend as far down in undisturbed subsoils as in the loose silt of old excavations. The best subsoils for crop or plant marks are compact gravels, chalk, and silt. Limestone and sandy subsoils, along with loose grav els and clays, are generally unsuitable. Negative marks are usually indepen re closely asso- bsoils appear dent of the subsoil, because buried foundations, walls, and roads almost always have an adverse effect on the crops growing above them. g of a field ng tends to allow for several lly become less rm, the marks estroy soil marks Harrowing, drill- marks . In the production of crop marks, the type of plant cover is almost as important as the surface geology. Cereal crops are the best medium through which buried remains are revealed, but clover, sugar beets, and grass also give good results. In very dry weather, almost any type of vegetation may produce distinctive signs; crop marks appear gradually, with the contrast and amount of detail steadily increasing. During periods of wet weather, color differences quickly vanish, but variations in plant height and density tend to remain.

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