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the point on the "back side" of this topological sphere. Capturing the Phenomena: Secondary Data Structure The TIN is conceived of as a primary data structure which contains within it a secondary data structure in which the essential phenomena and features of the terrain are represented and named as integrated, holistic objects. Different disciplines may regard different aspects of the terrain as the "essential phenomena" of the surface (Mark, 1978). We, for our own work, have adopted a set of "surface specific points and lines" to be our working, secondary, phenomenon structure. Peaks, pits and passes form the major portion of the set of surface specific points. Peaks are points that are relative maxima, i.e., higher than all surrounding neighbors. Pits, likewise, are relative minima. Passes are saddle points on the surface, relative maxima in one direction and relative minima in another. Methods for Generating TIN's There are two principal phases to the generation of TIN°s: the selection of the data points and their connection into triangular facets. Manual selection of the points and links which constitute the triangular network is one of the most obvious and accessible methods of creating a TIN. Manual point selection combined with the automated triangulation is another technique which has been used. The existence of efficient programs for the triangulation of an arbitrary set of points under a variety of optimality criteria (Fowler, 1978, Gold, 1977, Shamos and Hoey, 1975) makes this approach attractive. A somewhat larger number of nodes need be recorded in order to resolve ambiguities which can be interpreted by the human operator. This is more than offset by the increased ease and speed of entry. In light of the increasing availability of machine readable terrain data particularly in the form of very dense raster DTM's produced by automated orthophoto machines (Allan, 1978), it is becoming desirable to use automated triangulation. We have undertaken the development of a system to do this. The first 98
equirement for such a program is that it be presented with error free input. Some automatic DIM machines produce occasional blunders or "spikes" and it is necessary that these be filtered out before the data can be presented to the TIN generation system. The first phase of generating a TIN from a very dense DTM is the extraction of the skeleton of surface specific ppoints and lines. To derive these features, we use a local geometric operator, similar to those used in picture processing, to identify possible points on ridge or channel lines (Peucker and Douglas, 1975). Subsequently, these points are linked into ridges and channels. These points are then automatically connected in a Delaunay triangulation (Fowler, 1978), th°~ resulting model is compared with the original very dense grid, and additional support points are added at the points of worst fit until the maximum discrepancy between the TIN model and the original is within a pre-specified tolerance. Applying the Model Most applications of the TIN involve one or more of three basic processes: 1. Sequential element by element processes, 2. Searches - locating the closest node to a given point, or locating a point within a triangle, 3. Intersection of the terrain surface with various other surfaces by tracking their lines of intersection. Since the nodes of a TIN refer explicitly to their neighbors, sequential element by element processes may refer to them without the penalty of having to search for them. Hill-shading and slope mapping both refer essentially only to the individual triangles on the TIN surface to obtain the location and orientation of the facets. In some cases, hill-shading will access the information about the facets which adjoin a given triangle, but this process stops at the first neighboring facet. These are the most simple methods for employing the TIN and lead to simple algorithms. Tasks which require searching use the adjacency information in the TIN to walk through the network until a specified condition is met. The topological structure of the TIN makes this form of search quite efficient. 99
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'/1UTO QIRTO IV Proceedings of the
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SPONSORED BY: Proceedings of the Vo
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FOREWORD This is the fourth confere
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PREFACE The technical articles cont
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The Use of Computer Generated Maps
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Interactive Computer Mapping ......
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A Formal Model of a Cartographic In
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PHOTOGRAMMETRY SESSIONS Introductio
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William 0. Lucoff of Cal. State at
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widths may be varied at random from
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command codes to the minicomputer a
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Figure 2 Computer Controller EXPOSU
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— 1 X 0 u_ ABCDE M X ^ ^j to C£
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Figure 12 Portion of 48"X60" Chart
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3. THE GAS SYSTEM Chicago Aerial Su
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mode and guides the operator throug
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Figure 1 - Input Edit Figure 2 - Li
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Figure 7 - illegal Elevations Figur
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L Figure 11-Matching Between Models
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1. Street trees are defined as any
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exists between the calculated data
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Trom a conversation with Robert Lee
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II. The Alternatives Various conven
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With error correction as the final
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1. Introduction PRACTICAL EXPERIENC
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instruments with digital mapping te
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the patterns and stores the digital
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o Provides the capability to conver
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II.System Description Figure 1 is a
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Status signals are located on the m
Page 63 and 64: which have been digitized and recor
Page 65 and 66: Figure 4 Digitized/Recorded Image C
Page 67 and 68: IMAGE PROCESSING The Image Processi
Page 69 and 70: II. Background The work reported in
Page 71 and 72: coordinates from topographic maps.
Page 73 and 74: polation techniques are available i
Page 75 and 76: egistrations. In all areas where re
Page 77 and 78: THE INTERACTIVE IMAGE SYSTEM FOR TH
Page 79 and 80: The operator may type in commands w
Page 81 and 82: input, each request being terminate
Page 83 and 84: The language elements invoke indepe
Page 85 and 86: IMAGE PROCESSING AND NAVIGATION FOR
Page 87 and 88: 4. Image Acquisition and Amplitude
Page 89 and 90: disc); - the satellite spin-speed w
Page 91 and 92: line start. These parameters are se
Page 93 and 94: PRACTICAL APPLICATIONS FOR DIGITAL
Page 95 and 96: need for early warning of impending
Page 97 and 98: In order to manipulate classes of f
Page 99 and 100: depends mainly on the density of fe
Page 101 and 102: A DATA STRUCTURE FOR A RASTER MAP D
Page 103 and 104: FIG. 2. A border with indicated max
Page 105 and 106: pointers associated with the max-po
Page 107 and 108: y-max 1 z \7 'x-min \x-max 3 x-min
Page 109 and 110: DIGITAL TERRAIN MODELS SESSIONS Int
Page 111 and 112: Their programs have been developed
Page 113: that the purpose of the digital ter
Page 117 and 118: equivalent to locating the lines of
Page 119 and 120: Brassel, K.,1974,"A Model of Americ
Page 121 and 122: It is not the intention of this pap
Page 123 and 124: One feature in this should be empha
Page 125 and 126: neighbouring data points to estimat
Page 127 and 128: Lawson, C.L., 1977. Software for C-
Page 129 and 130: EDIT SYSTEM HARDWARE The IPIN Edit
Page 131 and 132: Each edit terminal will also contai
Page 133 and 134: FIGURE 2. PLOT OF GEOMORPHIC DATA 1
Page 135 and 136: a 0° 0 0 + 0 o 0 FIGURE 4. SELECTE
Page 137 and 138: FIGURE 5. CONTOUR PLOT OF INTERPOLA
Page 139 and 140: absorbed in the merger if the diffe
Page 141 and 142: To an every-increasing degree, the
Page 143 and 144: potential storage volumes of depres
Page 145 and 146: Soil type sand, Vegetation trees -^
Page 147 and 148: References Brnjac, M; Carlsen, L; M
Page 149 and 150: is particularly important to allow
Page 151 and 152: (b) If Z-coordinate of the vertex B
Page 153 and 154: Figure 3a. TIN DTM Projection Figur
Page 155 and 156: URBAN MAPPING SESSIONS Introduction
Page 157 and 158: Norfolk, and Hampton Virginia. Part
Page 159 and 160: MAPPING SERVICES IN FAIRFAX COUNTY,
Page 161 and 162: If errors are detected they are res
Page 163 and 164: Some are only printed as the stocks
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URBAN MAPPING AND RELATED AUTOMATED
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tersection matching program was wri
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The selection of coding schemes wil
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cartography and are firmly committe
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main purpose of this paper. Five of
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The project was undertaken specific
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play and analysis. By breaking from
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The operating system environment is
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INTERACTIVE COMPUTER MAPPING* Thoma
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- By displaying variables in map fo
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with a start - head- and an end -ta
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Rovner, P.D and Feldman, J.A., 1968
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eading this complex type of map, (2
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y a law pertaining to persons 65 an
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So far the analysis has been concer
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enta separation to the family age g
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Mortality maps have been widely use
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1970 population values, growth rate
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CANCER MORTALITY BY CENSUS TRACT 19
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References Burbank, F., Epidemiolog
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Computer graphics is changing all t
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time to define the uses to which th
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tually complete - we had a meeting
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EXPLORATION AND UTILITY SYSTEMS SES
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AUTOMATED MAPPING AND FACILITIES MA
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turned out to be a boon for automat
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As an example, one utility had five
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suburb of Denver, is a group of eng
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Introduction CADAE * (COMPUTER AIDE
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using CADAE, but the convenience an
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fractions of an inch to 1/64 or in
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Now that the viability of CADAE has
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"LANDFORM" LAND ANALYSIS AND DISPLA
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(2) Information Display (3) Design
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scales, and perspective views can b
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ENGINEERING APPLICATIONS OF DIGITAL
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Once the Map Grids are complete, th
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TOPOLOGICAL MODELS FOR ARCHITECTURA
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dimension, may be oriented in two w
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1-cells, and the 0-cells on the bou
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IX. One and two-dimensional structu
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looking from c^ to c9 near side far
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Figure 4 File Layout for Model of a
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DATA BASES, SMALL SYSTEMS There wer
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The consistency requirements are se
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A 0-cell is A 1-cell is a A 2-cell
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is a 2-ditnensional surface, and pr
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Our Algorithm From the topological
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(a) graph \ (b) disk: node 5 lO (c)
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as earthquake damage assessment, lo
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data is relatively simple. Problems
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In theory, the structure of such a
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BASIS resides on a minicomputer ope
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DATA BASES, LARGE SYSTEMS SESSIONS
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Robert Haralick and Linda Shapiro o
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COMPUTER-ASSISTED ENVIRONMENTAL DAT
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System (GRIDS) and Calma Mapping Sy
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Results Space does not permit the r
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encoded data appear to be very sign
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NATIONAL OCEAN SURVEY—AUTOMATED I
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centered at NOS Headquarters, but r
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separately. There are also five of
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graphic, chart base, and labels may
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Introduction GEOMODEL - INTEGRATED
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ace, income, miles of bus-lines, or
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phrase pointer Figure Ib. 1-cell Fe
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Implementation The development plan
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ECQBASE OF BRITAIN: status report o
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1. Coastlines (high water mark) inc
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much statistical data, e.g. , from
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Figure 1 Scale of digitisation of p
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I. Introduction A DATA STRUCTURE FO
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One obvious division of the state i
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Figure 2 illustrates this structure
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Raster or grid form is another form
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For each type of spatial data struc
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The following questions are possibl
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4. Freeman, H., "Computer Processin
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also be generalized to remove exces
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Figure I. On the left, a map of zon
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The other important role the error
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REFERENCES Corbett, J. (1975). "Top
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The fundamental building block of a
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discussed previously are of the COD
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[2] Bonczek, R. H.; Holsapple, C. W
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REFERENCE BASE REFERENCE LINES NAP
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Polygon data, in contrast, results
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An alternative to grid resampling i
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Should this table already contain a
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Murray, F. W. (1968) A_ Method of O
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ships between units, and thereby fe
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ture, encode, reduce, edit, format,
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could be assigned to each 40-acre g
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more on chain encoding rather than
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RIDS-CURRENT TECHNOLOGY IN RESOURCE
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The RID system is designed to overl
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Data Input Once the relevant data h
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Data Manipulation Timber Contour Cu
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THE DEVELOPMENT OF A NATIONAL SMALL
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III. The National Small-Scale Data
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cally-structured data base is under
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Appendix A: HAWAII: Hydrography U>
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INTERACTIVE CARTOGRAPHY, SMALL SYST
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options but it also extends our res
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sis techniques) information not pre
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media forming input to the system i
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D. CIS Data Base Limitations There
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input space into a set of 8 x 8 sub
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esolution of the system and the num
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impractical to use this terminal fo
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and heat from power plants into wat
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The present and future Low-resoluti
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Development of GIMMAP at the Kansas
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The second area of development is a
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GROUP Fig. 1
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MOVING INTERACTIVE THEMATIC MAPPING
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directives. Both map and data files
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Parameters are commonly of the form
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7. Conclusions In the s:!x months C
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INTERACTIVE CARTOGRAPHY, LARGE SYST
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developed at LBL has been particula
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printed at a common scale and forma
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1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
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V. Production Sequence The most imp
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1. Introduction MULTIPLE SYSTEM INT
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measurements during map compilation
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Photogrammetric —— > Digitizer/
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intersections. These are a few exam
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Introduction ENERGY ANALYSIS BY MEA
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enabled us to undertake runs consit
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Cost (k $) (D CD M M
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which seek to incorporate powerful
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ELECTRON BEAM RECORDERS FOR AUTOMAT
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data files are supplied as an 8 Bit
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signals representative of map featu
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composite photograph prepared to sh
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Figure 5 16 AAIPS Approach Charts R
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Figure 8 - LANDSAT Image Recorded i
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AUTO-CARTO IV STAFF AND COMMITTEES
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University of Kansas Mike Hogben A'
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Efi Arazi, President Sci-Tex Corp.,
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Peter F. Bermel Chief, Eastern Mapp
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Sherry K. Brown Princeton Universit
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Steven D. Clark Petroleum Informati
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Richard Davis NOAA, NOS 6001 Execut
Page 455 and 456:
John Durkin Suiranagraphics 35 Bren
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E. Porrest A-E-C Automation Newslet
Page 459 and 460:
Barry J. Glick Middlebury College M
Page 461 and 462:
Jim Hargis M & S Computing Co. 14 I
Page 463 and 464:
Howard C. Hopps Dept. of Pathology
Page 465 and 466:
Lee P. Johnston GeoGraphic Decision
Page 467 and 468:
Herbert Kressler Defense Mapping Sc
Page 469 and 470:
D. Richard Lycan Center for Pop. Re
Page 471 and 472:
Robert K. McKinney Weyerhaeuser Co.
Page 473 and 474:
Joel L. Morrison Dept. of Geography
Page 475 and 476:
David Osiecki 83 Gerber Rd. South W
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A.D. Poole Phillips Petroleum Co. 2
Page 479 and 480:
Dirck L. Rotty USDA Forest Service
Page 481 and 482:
Craig L. Shafer NFS 18 & C Street,
Page 483 and 484:
Bobby Staudt M & S Computing 406 Au
Page 485 and 486:
Laure Thompson George Mason Univers
Page 487 and 488:
D.J. Walker Image Graphics 107 Ardm
Page 489 and 490:
Alberta Auringer Wood Chairperson,
Page 491 and 492:
AUTHOR INDEX - VOLUME II Allam, M.
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Schmidt, Warren E. ...............
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