An examination of techniques for reformatting digital cartographic data. Part 2: The vector-to raster process.
Donna J. Peuquet
1981, Cartographica: The International Journal for Geographic Information and Geovisualization (18) 21-33
Current graphic devices suitable for high-speed computer input and output of cartographic data are tending more and more to be raster-oriented, such as the rotating drum scanner and the color raster display. However, the majority of commonly used manipulative techniques in computer-assisted cartography and automated spatial data handling continue to...
Crystal growth of calcite from calcium bicarbonate solutions at constant PCO2 and 25°C: a test of a calcite dissolution model
Michael M. Reddy, Niel Plummer, E. Busenberg
1981, Geochimica et Cosmochimica Acta (45) 1281-1289
A highly reproducible seeded growth technique was used to study calcite crystallization from calcium bicarbonate solutions at 25°C and fixed carbon dioxide partial pressures between 0.03 and 0.3 atm. The results are not consistent with empirical crystallization models that have successfully described calcite growth at low PCO2 (< 10−3 atm). Good agreement was...
Aliphatic structure of humic acids; a clue to their origin
Patrick G. Hatcher, G.E. Maciel, L.W. Dennis
1981, Organic Geochemistry (3) 43-48
Nuclear magnetic resonance spectra (both 1H and 13C) of humic acids from diverse depositional environments indicate the presence of aromatic chemical structures, most likely derived from lignin of vascular plants, and complex, paraffinic structures, most likely derived from algal or microbial sources. The latter components account for a major fraction of humic...
The logic of multispectral classification and mapping of land
Charles J. Robinove
1981, Remote Sensing of Environment (11) 231-244
The use of multispectral reflectance data as surrogates for land attributes must be done within strict rules of logic and with a recognition of judgmental factors such as the use of a priori or a posteriori classification schemes. The naming and describing of spectral classes as surrogates of information classes...
Analysis of variance of thematic mapping experiment data.
G.H. Rosenfield
1981, Photogrammetric Engineering and Remote Sensing (47) 1685-1692
As an example of the methodology, data from an experiment using three scales of land-use and land-cover mapping have been analyzed. The binomial proportions of correct interpretations have been analyzed untransformed and transformed by both the arcsine and the logit transformations. A weighted analysis of variance adjustment has been used....
Gas hydrates (clathrates) causing pore-water freshening and oxygen isotope fractionation in deep-water sedimentary sections of terrigenous continental margins
R. Hesse, W.E. Harrison
1981, Earth and Planetary Science Letters (55) 453-462
The occurrence of gas hydrates in deep-water sections of the continental margins predicted from anomalous acoustic reflectors on seismic profiles has been confirmed by recent deep-sea drilling results. On the Pacific continental slope off Guatemala gas hydrates were brought up for...
Thermal history of sedimentary basins by fission-track dating
N.D. Briggs, C. W. Naeser, T. H. McCulloh
1981, Nuclear Tracks (5) 235-237
[No abstract available]...
Statistics in Oklahoma's petroleum industry, 1980 ( USA).
M.L. Prater
1981, Oklahoma Geology Notes (41) 196-208
Using graphs and tables, outlines statistics for oil and gas drilling activity in the state, for discovery and production levels, established reserve quantities, and the market value of hydrocarbons.-L.Martin...
Fourth Australian cartographic conference: Keynote address
Rupert B. Southard
1981, Cartography (12) 19-25
No abstract available....
Chemical constraints of groundwater management in the Yucatan peninsula, Mexico
W. Back, J.M. Lesser
1981, Journal of Hydrology (51) 119-130
Two critical objectives of water management in the Yucatan are: (1) to develop regional groundwater supplies for an expanding population and tourism based on the Mayan archeological sites and excellent beaches; and (2) to control groundwater pollution in a chemically sensitive system made...
Helium soil-gas variations associated with recent central California earthquakes: Precursor or coincidence?
G.M. Reimer
1981, Geophysical Research Letters (8) 433-435
Decreases in the helium concentration of soil-gas have been observed to precede six of eight recent central California earthquakes. Ten monitoring stations were established near Hollister, California and along the San Andreas Fault to permit gas collection. The data showed decreases occurring a few weeks before...
U-Th-Pb systematics in hydrothermally altered granites from the Granite Mountains, Wyoming
J. S. Stuckless, Ignatius T. Nkomo, B. R. Doe
1981, Geochimica et Cosmochimica Acta (45) 635-645
U-Th-Pb systematics were investigated in 15 samples representing two types of deuterically altered Archean granite (albitized and silicified-epidotized granite) from the Granite Mountains, Wyoming. The loss of K-feldspar during both types of deuteric alteration was accompanied by an extreme reduction of Pb content from roughly 40 ppm to less than...
Preliminary paleomagnetic poles and correlation of the Proterozoic Uinta Mountain Group, Utah and Colorado
S.L. Bressler
1981, Earth and Planetary Science Letters (55) 53-64
Stable paleomagnetic directions have been obtained from seven sites spanning much of the 7-km-thick middle Proterozoic Uinta Mountain Group. The characteristic magnetization is carried partly by detrital(?) and secondary specularite and partly by hematite pigment. Preliminary paleomagnetic poles for six of...
Quaternary and geodetically measured crustal movements in the Tokai District, Central Honshu, Japan
W. Thatcher, T. Matsuda
1981, Journal of Geophysical Research Solid Earth (86) 9237-9247
Geodetic measurements made in this century demonstrate that modern movements correlate well with deformation that has occurred during the past 2 m.y. Both show effects of subduction and of the Quaternary collision of Izu Peninsula with Central Honshu. Westward from Suruga Bay, deformation is greatest near the coast, decreases markedly...
An outbreak of duck virus enteritis (duck plague) in a captive flock of mixed waterfowl
Roy D. Montgomery, George Stein Jr., Meliton N. Novilla, Sarah S. Hurley, Robert J. Fink
1981, Avian Diseases (25) 207-213
An outbreak of duck virus enteritis occurred in a flock of captive waterfowl composed of mallards (Anas platyrhynchos), black ducks (Anas rubripes), and Canada geese (Branta canadensis). Although all three species were housed together, morbidity and mortality were confined to the 227 black ducks and Canada geese, of which 180...
Chemistry of rock-forming minerals of the Cretaceous-Paleocene batholith in southwestern Japan and implications for magma genesis
G.K. Czamanske, S. Ishihara, S.A. Atkin
1981, Journal of Geophysical Research Solid Earth (86) 10431-10469
Petrographic descriptions and electron microprobe analyses of minerals are presented for 35 specimens from seven suites chosen to examine the transition from magnetite series to ilmenite series granitoids along two transects across the Cretaceous-Paleocene Inner Zone batholith of southwestern Japan. Regularities in chemical compositions of amphiboles, biotites, and feldspars suggest...
Small landslide types and controls in glacial deposits: Lower Skagit river drainage, northern cascade range, Washington
P.L. Heller
1981, Environmental Geology (3) 221-228
Observations of 167 small, shallow landslides spanning a 22-year period on extensively logged slopes of Quaternary terraces in the lower Skagit and Baker Valleys, Washington, shows that there is a relationship between the common slope failures in this area and the slope angle, stratigraphy, and logging practices. Landslide frequency increases...
Increasing the availability of national mapping products.
J.I. Roney, B.C. Ogilvie
1981, Information Bulletin, Western Association of Map Libraries (12) 133-143
A discussion of the means employed by the US Geological Survey to facilitate map usage, covering aspects of project Map Accessibility Program including special rolled and folded map packaging, new market testing, parks and campgrounds program, expanded map dealer program, new booklet-type State sales index and catalog and new USGS...
Geochemical prospecting for hydrocarbons in the outer continental shelf, Southern Bering Sea, Alaska
K.A. Kvenvolden, T.M. Vogel, J.V. Gardner
1981, Journal of Geochemical Exploration (14) 209-219
This geochemical survey is based on 20 stations located on the outer continental shelf of the southern Bering Sea in an area of 30,000 km2 that includes St. George basin. Hydrocarbon gases from sediment samples recovered by gravity coring at each of the stations were analyzed by gas chromatography. Data are...
Depositional and erosional features of the inner shelf, northeastern Bering Sea.
R. E. Hunter, D.R. Thor, M.L. Swisher
1981, Geologie en Mijnbouw (61) 49-62
Sonographs and bathymetric profiles from water depths less than 15m in the Nome-Solomon, Port Clarence, and Yukon Delta areas of the Alaskan Bering Sea coast show features generated by waves, currents, and drifting ice. The surficial sediments in the Nome-Solomon and Port Clarence areas range in grain size from sand...
7.3 quake in Algeria reviewed.
Robert O. Burford, Philip W. Harsh
1981, Geotimes (26) 18-20
A team from the U.S. Geological Survey studies the surface effects of the Oct. 1980 10 shock, whose epicenter was west of Algiers, near the African Plate boundary. -Authors...
An interpretation of episodic slip on the Calaveras fault near Hollister, California
J. O. Langbein
1981, Journal of Geophysical Research Solid Earth (86) 4941-4948
Data from a precision multi-wavelength distance measuring (MWDM) instrument, located near Hollister, California, have been analyzed in terms of strike-slip faulting in the region covered by the network. Four episodes of deformation that are readily identifiable in the MWDM data for the year following September 1975 can be modeled as...
Drainage areas of Texas streams, Colorado River Basin
F.H. Tovar, B. N. Maldonado
1981, Texas Department of Water Resources Report LP-145
No abstract available....
Application and analysis of borehole data for the Edwards aquifer in the San Antonio area, Texas
R.W. Maclay, T. A. Small, P.L. Rettman
1981, Texas Department of Water Resources Report LP-139
No abstract available....
Variations in the correlation of body size with concentrations of Cu and Ag in the bivalve Macoma balthica
Carol R. Strong, Samuel N. Luoma
1981, Canadian Journal of Fisheries and Aquatic Sciences (38) 1059-1064
The relationship between body size and concentrations of Cu and Ag varied from strongly positive to strongly negative in four populations of the bivalve Macoma balthica in San Francisco Bay. The correlations appeared to be influenced by the degree of enrichment in tissues, size-dependent differences and seasonal variations in growth rate, and...
