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

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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:: 84214806X

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

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

Scope:: VII, 465 Seiten

Year of publication:: 1974

Place of publication:: Ottawa, Ontario

Publisher of the original:: Canadian Inst. of Surveying

Identifier (digital):: 84214806X

Illustration:: Illustration, Diagramme, Karten

Signature of the source:: T 15 B 1305

Language:: German

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:: LAND USE CHAIRMAN. - R. C. HELLER

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: OBJECTIFIED DATA FOR URBAN GREEN-PLANNING FROM CIR-AERIAL PHOTOGRAPHY. Hartmut Kenneweg

Document type:: Multivolume work

Structure type:: Chapter

76 level (which still has to be defined!). Indices such as those suggested in this paper could well help city authorities to define limits, restrictions and conditions for construction permits. An interpretation test was carried out in some parts of the city Freiburg i. Br., because both aerial photographs and good statistical data were available there. Since some years ago, all statistical publications by the city administration of Freiburg show up all data about the economic and the population’s structure for larger city-districts, smaller ’’statistical districts" and, finally, for very small statistical units, the so-called "statistical blocks" (which do not necessarily correspond with normal street blocks) (FABRICIUS, 1973). Figure 1 shows a map of a part of the city and how it is divided into statistical units. Each of the units is separated from the others by streets, streams or other evident boundary-lines. So each unit can clearly be identified on the aerial photograph and may be used as an inventory unit for photo interpretation. CIR-aerial photography of 1971 and 1972, and the results of a census of both population and working places in 1970 (FABRICIUS, 1973) could be compared directly and without any later correction. The size of all statistical units is known and needs not to be measured from the photos. Two kinds of information were interpreted from the aerial photos: a) the number of trees for each statistical sub-unit as counted under a stereoscope b) the portion of green vegetation for each statistical sub-unit, acquired by counting and classifying dots on a dot-grid. There are some remarks necessary to explain the procedure: ad a) Resulting from the special functions which trees, especially big trees, have to fulfill in an urban environment a separate counting of trees was considered to be necessary. These special functions, which result from the large surface of big trees and consists of microclimate effects such as cooling by shade and transpiration, absorption of dust particles and chemicals-and an increase of air moisture, cannot be replaced by other, lower forms of vegetation such as turf, gardens and young trees. Moreover, the aesthetic effect of trees in a city is completely dif ferent from that of turf areas, flower plantations etc. Finally, big (= old) trees cannot easily be replaced such as old houses by new build ings; if they are removed, this is a decision which cannot be revised for a time of at least 20 years. That is why trees in urban areas need a special protection and should, therefore, be counted separately from other vegetation. There is no principal difficulty to count trees from aerial photo graphs. Observed under a mirror stereoscope, trees can always easily be separated from groups of bushes; also the separation of trees which are grown together does not cause many errors. Because of the mentioned special ecological functions of big trees and because of the impossibil ity of replacing them, it was decided, not to count all visible trees,

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