Systems for data processing, anaylsis and representation

Allam, Mosaad; Plunkett, Gordon

Bibliographic data

Monograph

Persistent identifier:: 1067490280

Title:: Systems for data processing, anaylsis and representation

Sub title:: ISPRS Commission II Symposium : June 6 - 10, Ottawa, Canada

Scope:: 1 Online-Ressource (XX, 530 Seiten)

Year of publication:: 1994

Place of publication:: Ottawa

Publisher of the original:: The Surveys, Mapping and Remote Sensing, Natural Resources Canada

Identifier (digital):: 1067490280

Illustration:: Illustrationen

Signature of the source:: ZS 312(30,2)

Language:: English

Additional Notes:: Erscheinungsdatum des Originals ist aus dem Copyrightjahr ermittelt.

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

Editor:: Allam, Mosaad; Plunkett, Gordon

Corporations:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Adapter:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Founder of work:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

Other corporate:: Symposium Systems for Data Processing, Analysis and Representation, 1994, Ottawa; International Society for Photogrammetry and Remote Sensing; International Society for Photogrammetry and Remote Sensing, Commission Instrumentation for Data Reduction and Analysis; Kanada, Surveys, Mapping and Remote Sensing Sector

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:: Monograph

Collection:: Earth sciences

Chapter

Title:: [Thursday, June 9, 1994]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: [Joint ISPRS/GIS '94 Plenary IV]

Document type:: Monograph

Structure type:: Chapter

Chapter

Title:: DIGITAL PHOTOGRAMMETRIC SYSTEMS AND THEIR INTEGRATION WITH GIS IAN DOWMAN

Document type:: Monograph

Structure type:: Chapter

IS ber of d and vation forces ration f this, n and ration those | with at the onitor nt of tion. that able was of ping nce 1 of ame een lave cent ther AL Of een and ese r of nan [he nal are packages designed as tools for GIS or image processing packages for rcmote sensing applications is still quite marked and the methods for evaluating such systems will differ. Heipke (1993) gives a full list of existing systems with references for further details. The main stereoscopic systems are the Intergraph ImageStation and the Leica DPW 710, 750 and 770 . These offer production of a full range of photogrammetric products: digital mapping, aerial triangulation, DEMs and orthoimages; the image moves relative to a fixed reference mark. The Zeiss Phodis ST has been released in its fixed image moving cursor form and the moving image fixed cursor version will be available later this year. Less expensive stereo systems such as the Leica DVP and the R-Wel DMS have more limited functionality and accuracy. A number of systems are available just for the production of DEMs and orthoimages, often these are part of an image processing or GIS. Examples are ERDAS which is an image processing system closely integrated with ARC/INFO, PCI Airphoto ortho and Ramtek HI-VIEW. This type of system is often not fully functional and is designed for the non specialist user. Care should be taken to check the accuracy attained and the algorithms used as these can affect the quality of the final result. For a fully functional photogrammetric system to be attractive to a production organisation it must offer at least the same functionality and efficiency as an analytical plotter. The user will also expect additional features such as some elements of automation and display. At present the cost and availability of scanning equipment will also be an important factor. For these reasons current equipment concentrates on the production of digital elevation models and orthoimages as these are the areas where automation is most developed and where there is a growing market. Colomer and Colomina (1994) show that there is no economic advantage at the moment to convert to digital systems. Some of these systems have been developed primarily for use with satellite data and other for aerial photography. Slowly systems are now offering both options. Under the heading of hardware it must not be forgotten that aerial photographs must be scanned before they can be used in digital Systems. Scanners are still expensive and create problems of image quality and data handling. No doubt these problems will be solved in time but at the moment only 339 organisations with large throughputs, such as for orthoimage production, use high precision scanners. A solution for some organisations is the use of scanners designed for the printing trade such as the Sharp JX-600 which has limited resolution (600 dots per inch) instability in the scanning axes, but can nevertheless be used for a number of applications. Satellite data has been a catalyst to the use of digital data and is one of the main sources of input to digital systems. The principle cartographic product from satellite data is the image map. This has an aesthetic and novelty value as well as being a useful cartographic document and source of data fro map revision. Image maps may be compiled from satellite data which has been warped in two dimensions or corrected by geocoding which involves the use of a digital elevation model (DEM). The final specification of such products varies according to the producer and the intended market and a wide range exists. Image maps are now derived from commercial production processes. In France Spot Image produces the Geospot range of products through collaboration with IGN Espace, BRGM, ISTAR and Geosys. The IGN Espace concept is described by Galtier and Baudoin (1992). In Sweden, Satelitbild (a SSC company) also has a production flow line and at Institut Cartografic Catalunya (ICC), (Colomina et al 1991) image maps are produced from aerial photographs and satellite data as commercial products. Line maps from satellite data are less frequently produced and the only well known example is IGN (France). For this standard photogrammetric mapping procedures are used. A number of organisations are developing digital mapping systems which will produce both line maps and image maps, for example at USGS (Skalet et al, 1992) and Canadian Centre for Mapping (CCM) (Ahac et al 1992). A system has been put into production at DMA (Warren 1992). A digital system for use with aerial photographs is in production at the ICC. 3.2 Software Software for digital photogrammetric systems can be divided into two categories. The first is the orientation and display software, the second is the application software which ranges from programs for collecting digital elevation models through editing collected or imported data to a GIS.

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