Digital Commons Network^™

Communicating With The New Electronic Libraries, Charles T. Meadow

Proceedings of the IATUL Conferences

New library and publishing technological developments are discussed from the point of view of how they will affect a library searcher of the future. Any library can become the entry point to a world-wide network of libraries, making almost all the world's literature available to any searcher. This, in turn, imposes requirements for better means of control of a search and better terminals, as well as a change of focus on the part of the library. Libraries are seen as developing into communications centers whose primary mission is helping users solve search problems, rather than repositories of information packages.

Pmva - Purdue Mean Value Analysis Program User's Guide, Jeff Brumfield

Department of Computer Science Technical Reports

No abstract provided.

Highway Bridge Vibration Studies, John T. Gaunt, C. Douglas Sutton

Purdue Road School

No abstract provided.

A Model For Representing Families Of Programmed System, Walter F. Richy

Department of Computer Science Technical Reports

No abstract provided.

Front Matter

The Writing Center Journal

No abstract provided.

From The Editors, Lil Brannon, Stephen North

The Writing Center Journal

No abstract provided.

A Technique To Determine Which Crop Development Stages Can Be Estimated From Spectral Data, V. J. Pollara, V. C. Vanderbilt, C. S. T. Daughtry

LARS Symposia

Estimates of crop development stage by remote sensing techniques are potentially more cost effective for large areas than present labor intensive estimates. Here, discriminant analysis for identifying crop development stage using multispectral data is discussed. The data analyzed were Exotech 100 measurements in four wavelength bands (.5-.6, .6-.7, .7-.8, .8-1.1 um) over field plots of soybeans and corn in West Lafayette, Indiana. Different row spacings, soils, plant populations, planting dates, soybean cultivars and crop years (1978, 1979, 1980) increased the generality of the data set.

Results show that development stage classes at the beginning and end of the growing, season …

Crop Monitoring In Australia Using Digital Analysis Of Landsat Data, Ken W. Dawbin, David W. Beach

LARS Symposia

This paper describes on-going co-operative research by the New South Wales (N.S.W.) Department of Agriculture and IBM Australia Limited. The aims of the project are to investigate if Landsat digital data can be used to map and monitor agricultural resources, particularly crop acreages and production, over large areas.

From the outset, multi-temporal whole scene computation has been a feature of the technical approach. Software modifications for large data volumes were carried out allowing supervised maximum likelihood classification to be used throughout the work. Considerable amounts of agronomic ground truth have been collected over wide latitudes for use in training the …

The Kars Image Analysis System: A Low Cost Interactive System For Instruction And Research, Lee T. H. Williams, J. Siebert, C. Gunn

LARS Symposia

The Kansas Applied Remote Sensing (KARS) Program and Department of Geography- Meteorology have developed an interactive digital image processing program package that runs on the University of Kansas central computer. The module form and simple Fortran programming of the package has allowed easy and rapid upgrades and extensions of its capabilities. The package is comprised of sub image extraction and rectification, image display and enhancement, and both supervised and unsupervised classification routines. It has been used in both instructional and research settings at the University.

Landsat D Thematic Mapper Image Resampling For Scan Geometry Correction, Arun Prakash, Eric P. Beyer

LARS Symposia

The Landsat D Project will use, for the first time, a new sensor called the Thematic Mapper. This sensor is a mechanically scanned radiometer with seven spectral bands, which images the earth from space with a thirty meter spatial resolution. It will provide enhanced remote sensing capabilities relative to earlier Landsats, through improved spatial, spectral and radiometric resolution, global coverage and more rapid processing of data for users.

To meet high throughput rates and stringent accuracy requirements, new hardware architecture and novel algorithms for data processing are used. Image data is received on the ground at a 84.9 megabit/sec rate …

Remote Sensing Education: A Special Report On The Conference Of Remote Sensing Educators - Corse-81, T. M. Lillesand

LARS Symposia

CORSE-81, Conference On Remote Sensing Education, was held May 18-22, 1981, at Purdue University. Co-sponsored by NASA and NOAA, the conference was organized and conducted by the Purdue University Laboratory for Applications of Remote Sensing (LARS). Attended by approximately 200 educators from a broad range of disciplines, CORSE-81 represented the first national conference in the U.S. dealing solely with the topic of remote sensing education.

This paper is an attempt to summarize the major trends and issues in remote sensing education which crystallized from the presentations and discussions of CORSE-81. These include: 1) a profile (by discipline) of remote sensing …

An Application Of Large Scale Computing Facilities To The Processing Of Landsat Digital Data In Australia, David W. Beach, Ken W. Dawbin

LARS Symposia

An early issue in the Australian Wide Scale Wheat Monitoring Project, started in November, 1978, was whether to use area sampling, as in the LACIE, or to be innovative and attempt whole scene processing. The availability of a large computing system and acknowledgment of the trends in price and performance of computers influenced a decision towards whole scene processing.

The computing facilities used in this project are described.

An interactive facility supported by software called ER-MAN II is installed on an IBM 3033 which simultaneously supports several hundred other interactive users. The pros and cons of using such a shared …

Problems Related To The Use Of Remote Sensing For Inventory And Mapping Of Lower Coastal Plain Forests, J. R. Helms, W. A. Shain

LARS Symposia

Studies involving Landsat MSS imagery of the southeastern United States have indicated that its primary usefulness would be of mapping for forest versus non-forest features. Best results have been obtained using imagery taken during spring or using combinations of two seasons. Color infrared aerial photographs are similar to the Landsat MSS in spectral sensitivity, but provide more detail of importance to forest managers than satellite imagery, especially if taken at medium scales (1/10,000 to 1/20,000).

Aerial photography is important and is used commonly for mapping forest stands, estimating areas, and planning silvicultural operations. Ground observations, although costly, are recognized as …

Physical Principles Of Local Heat Therapy For Cancer, Charles F. Babbs, David P. Dewitt

Weldon School of Biomedical Engineering Faculty Publications

Local hyperthermia therapy for cancer can produce selective heating of solid tumors on the basis of known physical laws. If energy is deposited in the general region of the tumor, temperature tends to develop in the tumor higher than that in surrounding normal tissues. The goal of therapy is to achieve cytotoxic temperature elevations in the tumor for an adequate period of time, without damaging nearby normal tissues. Several modalities exist for local heat treatment, of which radiofrequency and ultrasound offer the most promise for controlled, localized heating at depth. A paucity of blood flow in the tumor compared to …

Metamodeling And Its Application To Queueing Networks, Jeffrey P. Buzen, Subhash C. Agrawal

Department of Computer Science Technical Reports

No abstract provided.

Correcting For Anisotropic Reflectances In Remotely Sensed Images From Mountainous Terrains, Heinz Hugli, Werner Frei

LARS Symposia

Remotely sensed images from mountainous terrains are subject to important radiometric variations which we desire to correct. A quantitative analysis of a remote sensing model is presented and the different aspects of radiometric correction are overviewed. A computer simulation is performed in order to better understand the combined effects of anisotropic reflectance characteristics and variable surface orientations, as encountered in remote sensing of mountainous terrains covered with vegetation. The results illustrate typical reflectance effects and show that the possibilities for a radiometrical correction are limited. This is due to the practical difficulty of exactly determining all reflection properties in a …

Acceptability On Non-Library/Information Science Publications In The Promotion And Tenure Of Academic Librarians, Priscilla Geahigan, Harriet Nelson, E. Stewart Saunders, Lawrence Woods

Libraries Research Publications

If library/information science is a true academic discipline, then academic librarians must reevaluate the acceptability of publications in other fields if they are to be considered academic faculty members in the field of library/ information science. This was perceived to be the issue by the Purdue University Library faculty when they altered the tenure and promotion document to require that consideration for promotion and tenure be based on publication in library/information science. The issue has been raised by the growing number of librarians with non-library/information science Ph.D.s who prefer to publish in the area of their Ph.D. A survey of …

Alternatives To The Shelflist Measure For Determining The Size Of A Subject Collection, E. Stewart Saunders, Harriet Nelson, Priscilla Geahigan

Libraries Research Publications

The adequacy of the shelflist count for estimating the size of a library’s holdings in a discipline was tested by determining the percentage of titles in five disciplines which were classified in Dewey or LC classes reflecting those disciplines. For some disciplines, the percentage of titles which were not classified in the relevant class letters or numbers ran as high as 70 and 80 percent. Two methods for correcting inaccurate shelflist counts are presented.

Techniques For Evaluation Of Area Estimates, Marilyn M. Hixson

LARS Symposia

Since the launch of the first Landsat satellite in 1972, satellite remote sensing has been increasingly recognized as a tool for mapping and area estimation of earth resources. The Landsat MSS records a region on the ground about one acre (0.5 ha) in size. This provides a good spatial resolution for mapping purposes, and Landsat data have been used for mapping such characteristics as general land use and soil type. Estimation of the areal extent of a feature has been a key use of Landsat data. The primary uses for area estimation have been in agriculture with crop and forest …

Registration Of Digital Imageries Using Optimization Technique, A. D. Kulkarni, B. L. Deekshatulu, K. R. Rao

LARS Symposia

Registration is an important aspect of any image processing system. Registration may be interpreted as automatic determination of local similarity between two structured data sets. Several digital techniques have been used for registration. Principal among these are cross-correlation, normalized cross-correlation and minimum distance criteria. Fast algorithms like sequential similarity detection for translational differences have been developed. In all the above methods, a portion of one image is taken as reference and similar portion in the other image is located by carrying out a search over the other image. There may be translational, rotational and scale differences between the two imageries. …

Forcing Functions And Geo-Referenced Information Systems, Roy Chung

LARS Symposia

The geographical information system is viewed as a macro-system composed of a set of interlocking sub-systems. First, there is a conceptual system of ideas, which is then mapped onto a system whose components include data, hardware, and software. In the process the data are transformed into information which then becomes input for a planning system whose components include spatial and non-spatial models. This paper explicitly proposes the system concept of Forcing Functions as a key concept in G.I.S. planning, design and use. The implications of this approach for current issues such as the geo-coding alternatives, the selection of contents of …

Waveband Evaluation Of Proposed Thematic Mapper In Forest Cover Classification, Richard S. Latty, Roger M. Hoffer

LARS Technical Reports

This study involved the evaluation of the characteristics of multispectral scanner data relative to forest cover type mapping, using NASA's NS-001 multispectral scanner to simulate the proposed Thematic Mapper (TM). The objectives were to determine: (1) the optimum number of wavebands to utilize in computer classifications of TM data; (2) which channel combinations provide the highest expected classification accuracy; and (3) the relative merit of each channel in the context of the cover classes examined. Transformed divergence was used as a measure of statistical distance between spectral class densities associated with each of twelve cover classes. The maximum overall mean …

Optimal Tile Salvage, Francine Berman, Frank Thomsons Leighton, Lawrence Snyder

Department of Computer Science Technical Reports

No abstract provided.

History And Overview Of Csnet, Peter J. Denning, Anthony Hearn, C. William Kern

Department of Computer Science Technical Reports

No abstract provided.

Software Science Revisited: A Critical Analysis Of The Theory And Its Empirical Support, V. Y. Shen, S. D. Conte, Herbert E. Dunsmore

Department of Computer Science Technical Reports

No abstract provided.

Estimation Of Proportions In Mixed Pixels Through Their Region Characterization, C. B. Chittineni

LARS Symposia

The estimation of proportions of classes in the mixed pixels of multichannel imagery data is considered in this paper. A significant portion of the imagery data consists of a mixture of the responses of two or more objects whenever the objects being viewed by a multispectral scanner are not large enough relative to the size of a resolution element. A region of mixed pixels can be characterized through the probability density function of proportions of classes in the mixed pixels. Using information from the spectral vectors of a given set of pixels from the mixed pixel region, expressions are developed …

Mapping Deer Yard Habitats Using Landsat: A Practical Application, Kevin D. Doran

LARS Symposia

Mapping habitats suitable for deer yards using Landsat Multispectral Scanner (MSS) digital data has proven to be a valuable tool in New Hampshire. By knowing the requirements for deer yards in conjunction with the forest types of an area, considerable time and money can be saved by the game biologist locating deer yards. The procedure used is a relatively simple one. Landsat classification maps are generated for various towns using softwood, hardwood, mixed wood, open, and water categories. The maps are then used by the biologists to field check every softwood area on the classification map, softwood areas being important …

Things Fall Apart: The Writing Center Will Hold, Tilly Eggers

The Writing Center Journal

No abstract provided.

Accommodating The Iq And Learning Style Of A Student Writer, N. Rabianski

The Writing Center Journal

No abstract provided.

The Tutor As Messenger, Judith Fishman

The Writing Center Journal

No abstract provided.