Remote sensing for resources development and environmental management: Remote sensing for resources development and environmental management

damen, m. c. j.

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Multivolume work

Persistent identifier:: 856342815

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A. A. Balkema

Identifier (digital):: 856342815

Language:: English

Additional Notes:: Volume 1-3 erschienen von 1986-1988

Editor:: Damen, M. C. J.

Document type:: Multivolume work

Volume

Persistent identifier:: 856641294

Title:: Remote sensing for resources development and environmental management

Sub title:: proceedings of the 7th international Symposium, Enschede, 25 - 29 August 1986

Scope:: IX Seiten, Seiten 551-956

Year of publication:: 1986

Place of publication:: Rotterdam; Boston

Publisher of the original:: A,. A. Balkema

Identifier (digital):: 856641294

Illustration:: Illustrationen, Diagramme

Signature of the source:: ZS 312(26,7,2)

Language:: English

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

Editor:: Damen, M. C. J.

Editor:: International Society for Photogrammetry and Remote Sensing, Commission of Photographic and Remote Sensing Data

Publisher of the digital copy:: Technische Informationsbibliothek Hannover

Place of publication of the digital copy:: Hannover

Year of publication of the original:: 2016

Document type:: Volume

Collection:: Earth sciences

Chapter

Title:: 7 Human settlements: Urban surveys, human settlement analysis and archaeology. Chairman: W. G. Collins, Co-chairman: B. C. Forster, Liaison: P. Hofstee

Write comment:: Wegen zu enger Bindung kommt es teilweise im Original zu Textverlust.

Document type:: Multivolume work

Structure type:: Chapter

Chapter

Title:: Automatic digitizing of photo interpretation overlays with a digital photodiode camera: The ADIOS system. C. A. de Bruijn & A. J. van Dalfsen

Document type:: Multivolume work

Structure type:: Chapter

Symposium on Remote Sensing for Resources Development and Environmental Management / Enschede / August 1986 Automatic digitizing of photo interpretation overlays with a digital photodiode camera: The ADIOS system C.A.de Bruijn & A.J.van Dalfsen ITC Department of Urban Survey and Human Settlement Analysis, Enschede, Netherlands ABSTRACT: The rapid introduction of geoinformation system in various fields of planning and municipal administration creates an urgent need for efficient methods to input information obtained by visual photointerpretation. The paper describes the ADIOS system for "automatic digitizing" of photointerpretation overlays, currently under development at the ITC Department of Urban Survey and Human Settlement Analysis. A digital camera with 2048 x 2048 pixel resolution is used to scan landuse interpretation overlays. After some processing to improve the quality of the scanned lines, the landuse codes of each polygon are added, from a centroid file or during an interactive session at a color graphics terminal. Resulting data can then be sent to a geoinformation system like USEMAP for geocorrection and further processing. 1 INTRODUCTION Aerial Photography can supply planners of fast growing cities with thematic information on landuse, residential patterns, site suitability, traffic behaviour, etc.. Often such information is difficult to get by other means. Visual interpretation will, for the time being, remain the predominant technique for data extraction from airphotos, especially in urban areas with complex spatial structures. However, data obtained in this way have to fit in the geo-information systems that will increasingly be adopted by municipal authorities for their spatial datahandling, both thematic and topographic. Since 1973 various methods to input photo intepretation data in geodatabases have been developed at ITC as part of the USEMAP software. Starting with manual gridencoding they now rely mostly on manual digitizing. Valuable results have been obtained in various projects. The use is rapidly increasing and has created new possibilities in linking thematic survey data closer to their eventual applications. Still, manual digitizing is far from optimal and as pointed out by TOMLINSON (1980) digitizing one of the main problems in the field of geodataprocessing. Better, faster and more accurate input methods are urgently required if airphoto interpretation is going to remain an efficient datasource. 2 VARIOUS METHODS OF DATA INPUT Entries in a geodatabase consist usually of two elements: a spatial description (location of point or area) and attribute information (thematic information about the point or the area, e.g. landuse). The spatial description of an area can be in the form of lines (vectors) defining the limits of the area, or in the form of gridcells (pixels) that are marked as belonging to the area. Choice between lines and gridcells has been the source of much debate in the past, but the development of modern hardware has made it rather irrelevant, since it has become fairly easy to convert from one datatype to another. However, at present "large scale" topographic databases are usually vector databases, while "medium and small scale" thematic databases tend to be gridcell databases. Interpretation data can be entered into a computer database by coding gridcells, (now rather obsolete), manual digitizing (the most common method) or scanning. Manual digitizing during interpretation may distract the interpreters’ attention and is certainly not feasible for all types of interpretation, while digitizing after interpretation means an additional step in the survey process, it may delay the final results and introduce additional errors. Either way, digitizing remains a time consuming obstacle, when data are to be used in a digital environment and at some places a tendency has been observed to use lower quality satellite Remote Sensing data instead of data from airphoto interpretation "because the data are already in digital format". The introduction of more efficient data input methods is therefore of paramount importance to ensure the continuing usefulness of airphoto interpretation. In 1981, based on earlier work by MEISNER (1981) the first author wrote a research proposal to develop at ITC a "digitizing machine" based on a high resolution CCD camera. The proposal called ADIOS (Automatic Digitizing of Interpretation Overlays System) was accepted in 1982 but acquisition of the required hardware was complex and time consuming due to the absence of representatives for this type of digital cameras in Europe. In October 1985 an Eikonix 78/99 digital camera arrived at ITC and development of application software and testing of various methods could eventually start in 1986. 3 EMPHASIS ON PHOTO INTERPRETATION OVERLAYS The starting point of the ADIOS concept is that the normal visual stereoscopic photo interpretation should not be affected by subsequent digitizing procedures. The automatic digitizing should be based on the "interpretation overlay", the transparancy containing lines and codes which forms the end product of most regular interpretation jobs, (fig.l)

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