VIIIth International Congress of Photogrammetry: General reports

Fagerholm, P. O.; Lycken, L. E.; Thunberg, A.; Öhlin, K. A.

Bibliographic data

Multivolume work

Persistent identifier:: 1048861678

Title:: VIIIth International Congress of Photogrammetry

Sub title:: Stockholm, Sweden, July 17 - 26, 1956

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048861678

Language:: English

Other Title:: Paralleltitel: VIIIe Congrès International de Photogrammétrie

Editor:: Fagerholm, P. O.

Corporations:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Adapter:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Document type:: Multivolume work

Volume

Persistent identifier:: 1048997715

Title:: General reports

Sub title:: VIIIe Congrès International de Photogrammétrie

Scope:: circa 330 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048997715

Illustration:: Illustrationen

Signature of the source:: ZS 312(12,3)

Language:: French

Other Title:: Paralleltitel: Rapports généraux

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

Contributor:: Lycken, L. E.; Thunberg, A.; Öhlin, K. A.

Editor:: Fagerholm, P. O.

Corporations:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Adapter:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Founder of work:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Other corporate:: International Congress of Photogrammetry, 8., 1956, Stockholm; Board of the VIIIth International Congress of Photogrammetry

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2019

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: REPORT OF COMMISSION VII PHOTOGRAPHIC INTERPRETATION to the INTERNATIONAL SOCIETY OF PHOTOGRAMMETRY STOCKHOLM, SWEDEN JULY, 1956

Document type:: Multivolume work

Structure type:: Chapter

Section

Title:: REPORT OF COMMISSION VII NATURAL RESOURCES GEOLOGY

Document type:: Multivolume work

Structure type:: Section

GVII-34 PHOTOGRAM METRIC ENGINEERING has found it appropriate to plan loggings by studying aerial photographs. The logging areas are marked and described by using Old Delft scanning stereo scopes. This chart-room work is checked in the field. Korsnas AB is another big forest company, that has resolved to use photographs instead of drawn forest maps. Much attention is paid to the quality of the photographs as well as to ar ranging the photographs for comfortable use in the field. In connection with ex pensive uprooting of timber by unusually severe storms, aerial photographs have been taken of the areas in question and their limits determined by means of inter pretation. It has also been possible by these means to decide by which routes the felled lumber should be transported. In this way great profit has been derived from what otherwise would have been a more or less total loss. In the United States, access and spur road locations are first determined under the stereoscope or on topographic maps made by photogrammetric meth ods. Photos are used by foresters as a guide in locating rock or gravel for road construction. Photo interpretation is being relied upon to provide information on stream conditions when water transport of logs is contemplated. Aerial photos are commonly used to search out scattered patches of mer chantable timber, or to determine the boundaries of an area needed in scattered timber to include the desired sale volume. Residual stands are carefully studied on aerial photos to establish the feasibility of a salvage or relogging chance. Snag sales are sometimes based on photo counts. Numerous operators have their newly logged areas photographed at the end of each logging season to provide (1) a cutting record for inventory, (2) location of new roads, (3) condition of the residual stand, and (4) extent of slash problem, and other pertinent informa tion. Timber sale officers often use photos to make quick checks on the feasi bility of volume estimates submitted by cruisers. AERIAL PHOTOS LOCATE FOREST INSECT DAMAGE In the United States two forest insect laboratories—one at Beltsville, Mary land, and the other at Portland, Oregon-—have made extensive aerial photo graphic and interpretation tests for the detection and appraisal of insect dam aged timber. Because of the dynamic nature of insect populations, photography must be restricted to sampling methods due to cost, and to films and filters which record a discoloration of the normally green forests. Preliminary tests were aimed at determining whether certain types of insect damage could be detected on film; these tests indicate that infrared film is of no value, panchro matic film with an A-25 filter can be used for certain kinds of damage, but that color film produces the most accurate results when the interpretation is com pared with ground study plots. Scales of the color photography varied from 1:1,200 for detecting weevilled white pine leaders, to 1:5,000 and 1:7,920 for identifying insect killed pine and fir trees. If a reasonable degree of interpreta tion accuracy can be determined for each type of insect damage, sampling surveys will be designed so that appraisals of timber damage can be mide from the color pictures. Any aerial method has the limitation of being able to detect only faded trees; it does not account for surrounding infested trees which are still green but dead. Only ground inspection will reveal this ratio. PHOTO TECHNIQUES ARE VITAL TO FOREST FIRE CONTROL Forest fire protection is an activity in which aerial photo interpretation is playing a vital part. This is particularly true in the U. S. where there are vast

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