摘要:

SUMMARYThis paper describes an unsupervised classification scheme for the production of thematic maps from LANDSAT imagery. In this method, spectrally separable classes are identified from a four-dimensional histogram generated from a portion of a LANDSAT image. The scheme is very rapid, memory requirements are modest, and it can be implemented in an interactive mode on a timesharing computer system. Test results from an agricultural area near Melfort, Saskatchewan, exhibit accuracies of the classifications comparable to those obtained by supervised methods.

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854944

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

SUMMARYA study has been made of the use of Black Brant Sounding Rockets as platforms for Earth Resource remote sensing applications. The study considers the 17-inch diameter Black Brant V, the 10-inch diameter Black Brant III, and the 4.9-inch diameter Black Brant VI. A payload, including camera package, has been proposed for each vehicle ranging from the three-camera attitude controlled, Black Brant V, to the single-camera uncontrolled Black Brant VI. Details of vehicle and payload subsystems are given, including previous flight histories of the standard components, and the theoretical optical performance of the camera package is specified. It is shown that the area that can be photographed and the associated ground resolution are typically: 1 million km2(15 metres), 153,000 km2(5m) and 26,000 km2(35 metres) for the BBV, III and VI, respectively.Also considered in the study are launch facility requirements, payload recovery techniques and some potential applications; e.g., land utilization and crop surveys in the Prairies, and iceberg surveys in the Davis Strait. A general review is made of the relative merits for this application of sounding rockets compared with aircraft and satellites. The primary advantages of the rocket are: (1) an essentially instant synoptic view, (2) minimum financial losses due to poor weather conditions, (3) complete user control of system with regard to time of observations and security of data retrieval, (4) considerable economic benefits for remote and/or large area studies.

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854945

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

SUMMARYThe IMAGE 100 is a hardware-software system developed for analysis of digital imagery by the General Electric Corporation under contract to the Canada Centre for Remote Sensing (CCRS). The CCRS IMAGE 100 includes the following hardware: DEC PDP 11/40 computer with 72 thousand words of memory; 44 million word disk drive; two 800/1600 BPI 125 ips tape drives; 2 million word disk cartridge, 10 million bit solid state memory; high speed image analyzer (IMAGE 100); line printer/plotter. This system is controlled by a complex collection of FORTRAN and Assembler programs operating under a multi-tasking monitorThe primary purpose of the CCRS IMAGE 100 is to permit investigators across Canada to be able to analyse easily and rapidly the multi-spectral scanner data of ERTS (Earth Resources Technology Satellite). This paper describes the mathematical methods and system procedures used to classify scanner data with the CCRS IMAGE 100. The system is capable of supervised or unsupervised classification for five channel input data with parametric or non-parametric distributions. Advantage is taken of the multilevel classification system to reduce the number of inter-class decisions, and thus speed the classification process. Results of classifications for the various methods are presented for a typical scene.

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854946

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854947

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

SUMMARYWater colour measurements have been made with a 4-channel spectral-scanning photometer on a 160-mile flight line heading 50°South of East from Halifax out over the continental shelf. Observations were made in the spectral regions 46-.44μ, .59-.55μ, .70-.68μand .75-. 72μusing the four-channel photometer and at .97μusing a silicon photodiode photometer. The spectral data obtained is compared with ship-based chlorophyll measurements made along the same transect.

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854948

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

摘要:

SUMMARYThe apparent spectral reflectance over a water body measured by some remote means, such as an air-borne spectrograph, consists of three basic components. These are: the volume reflectance of the water, a reflected component from the water surface and a component due to atmospheric backscatter. However, it is only the volume reflectance which contains information which can be related to the in situ properties of the water body. A model is presented which defines in detail these principal components. Essentially the model illustrates the methodology whereby the volume reflectance function Rv(Λ) can be extracted from the apparent reflectance data.The volume reflectance function Rv(Λ) can then be expressed as a generalized colour index Kij= Rv(Λi)/Rv(Λj). These colour indices conveniently display and quantify the subtle colour characteristics of a water mass. These quantified colour indices are intrinsic optical parameters which may be directly related to the water quality. In addition, other evidence is presented which shows the value of the colour index concept as a water quality surveillance parameter.

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854949

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor

ISSN:0703-8992    

DOI:10.1080/07038992.1976.10854943

出版商:Taylor&Francis    

年代:1976

数据来源: Taylor