VIIIth International Congress of Photogrammetry: Reprints of papers

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:: 1048998053

Title:: Reprints of papers

Sub title:: VIIIe Congrès International de Photogrammétrie

Scope:: circa 1040 Seiten in verschiedenen Seitenzählungen

Year of publication:: 1957

Place of publication:: Stockholm

Publisher of the original:: [Verlag nicht ermittelbar]

Identifier (digital):: 1048998053

Illustration:: Illustrationen

Signature of the source:: ZS 312(12,4b)

Language:: French

Other Title:: Tirages a part

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

Section

Title:: [Commission IV]

Write comment:: Nicht alle Vorträge enthalten

Document type:: Multivolume work

Structure type:: Section

Section

Title:: Methods of Using Aerial Photographs for Mapping Purposes in Forests of the State and of Some Big Forest Companies in Sweden Bulletin from the Committee of Forest Photogrammetry By Nils Hagberg

Document type:: Multivolume work

Structure type:: Section

mans —— TT 1 | COMMISSION IV H1 | Appendix to the INT. ARCHIVES OF PHOTOGRPAMMETRY, Vol. XIk4, 1956 Methods of Using Aerial Photographs for Mapping | Purposes in Forests of the State and of Some Big Forest Companies in Sweden Bulletin from the Committee of Forest Photogrammetry By Nils Hagberg Survey of forest resources and needs for mapping Sweden counts as one of the most characteristic woodland countries of the world. About half of the country's exports are made up of forest pro- ducts. More than half of the country's area is covered by forests. Disregard- ing the area of ten thousands of lakes, swamps and other improductive land scattered in the forest regions, the use of productive forest land comprises nearly 230 000 sq. kilometres (57 million acres). Roughly speaking, half of this area belongs to farmers and lacks forest maps. The rest, which is owned in equal parts by forest industries and the Public, is for the most part mapped. Forest maps are usually revised at intervals of 10—20 years. Consequently, the area to be mapped annually is somewhere around 5 000 to 10000 square kilometres (1— 2.5 million acres). Difficulty has been experienced in getting the vast and expensive mapping projects carried out in time. Aerial photos have therefore been used since 1930, and since 1948 to an ever increasing extent, with the big forest enterprises leading in this field. The area mapped with the application of methods based on aerial photography is increasing rapidly and at present represents something around 20 000—30 000 sq. kilometres. Natural conditions and forest administration The new mapping methods arrived at differ greatly from each other. One substantial reason for this is to be found in the divergent forms of the natural features. The length of the country, measured from south to north, is 1 600 km (about 1 000 miles). In the southern parts of the country with prevailing natural conditions much resembling Central European con- ditions, the average annual volume increment of forest stands can be 10 15 cubic metres per hectare and the average height of mature stands 25-—30 metres. In the northern parts of the country, mainly located north of the Arctic Circle, the average volume increment for extensive forest areas is not more than 1 cub. metre per hectare, and the average height of mature stands is about 10 metres. There is no forest cover in the northern region at altitudes exceeding 600 metres above sea level. On the other hand, there is less divergence in the topography of the country, as even in the north the forests are mostly located in moderately hilly regions. Forest stands often lack definite boundaries. In Southern Sweden they run to a size of some 1— 3 hectares, while in the north their size is often more than ten times as much. A forest district is managed by a district forester, often with the help of an assistant forester, and 3—10 rangers. The area of a district in the south is 50—200 sq. kilometres and in the north 500—2 000 sq. kilometres. As a rule a district is divided into a number of blocks, often more than a

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