2011, ISBN: 9781130727302

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 26 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 2011. OCLC Nu… Mehr…

RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 26 pages. Original publisher: Reston, Va. : U. S. Dept. of the Interior, U. S. Geological Survey, 2011. OCLC Number: (OCoLC)719362789 Subject: Geophysical surveys -- Saint Clair River (Mich. and Ont. ). Excerpt: . . . Swath Bathymetry and Acoustic Backscatter Swath-bathymetric and acoustic-backscatter data were acquired with a Systems Engineering and Assessment, Ltd. ( SEA ), SWATHplus interferometric sonar operating at a 234-kHz frequency ( SEA, 2009 ). A total of 109 km of swath-bathymetric data was collected. The SWATHplus transducer was mounted at the bow of the R V Rafael ( fig. 2 ). A CODA Octopus F180 Attitude and Positioning system ( Coda Octopus Group, Inc. , 2009 ) recorded ship motion ( heave, pitch, roll, and yaw ) and DGPS corrected navigation. Additional navigation was recorded with a Differential GPS ( DGPS ) receiver positioned directly over the SWATHplus transducers. Horizontal and vertical offsets between navigation and attitude antennas and the SWATHplus transducer were recorded within the Octopus F180 and SWATHplus configuration files, and the offsets were applied as the data were acquired. SWATHplus data-acquisition software was used to record the bathymetric data at 4, 096 samples per swath ( ping ). Bathymetric data were acquired over variable swath widths that ranged from 10 to 100 m, in water depths of about 1 to 25 m. Eight sound-velocity profiles were acquired during survey operations at roughly 4-hr intervals using an Applied Microsystems SV Plus v2 Velocimeter ( Applied Microsystems, 2009 ) ( fig. 4 ). Variations in the speed of sound within the water column can affect the path of the acoustic ray as it travels from the transducer to the riverbed and back, introducing artifacts in the data. In order to minimize refraction artifacts, sound-velocity profiles were collected throughout the survey area in order to model the sound-velocity structure of the water column. DGPS navigation was used to record the horizontal and vertical position ( x, y, z ). . . This item ships from La Vergne,TN., RareBooksClub, RareBooksClub. Paperback. New. This item is printed on demand. Paperback. 340 pages. Dimensions: 9.7in. x 7.4in. x 0.7in.This historic book may have numerous typos and missing text. Purchasers can usually download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1860 edition. Excerpt: . . . Female. --Wings with two lines indicated much as in the preceding species. Fore wings with a white mark on the straightened part of the patch. Hind wings with a red streak along the apical margin. Length of the body 4 lines; of the wings 12 lines. a, b. St. Domingo. From Mr. Hearses collection. 8. Geometra Suncelata. Mas et fm. Flavescente-viridis; caput rufescens, vertice albo; palpi oblique ascendentes, articulo 3o brevi ala puncto discali albo rufo marginato, fimbria aurato-flava; antica puncto interiore nigro. Alas. --Antenna latissime pectinata; ala antica plaga marginali roseo-cinerea strigam emitiente. Fm. --Ala antica lituris duabus disjunctis mag is determinatis ex parte albis. Male and female. Yellowish green, yellow beneath. Head reddish, white about the eyes and with a white rertex. Palpi obliquely ascending; third joint elongate-conical, about one-fourth of the length of the second. Antenns of the male very broadly pectinated, simple at the tips. Wings with a white red-bordered discal point; fringe gilded yellow. Fore wings with a black point in the disk near the base. Male. --Fore wings with a rosy cinereous patch by the exterior border, limited by dark red on the inner side and emitting a like-coloured subapical streak. Female. --Fore wings with two marks like those of the male, but smaller, separate, more white and more definite. Length of the body 5 lines; of the wings 12 lines. a, b. St. Domingo. From Mr. Tweedies collection. 9. Geometra Factaria. Mas. Late viridis, crassa, subtus flava; corpus subtu album: vertex rnseo-albus; palpi porrscti, articulo 3o brevissimo; antenna latissime pectinata, apice rmplices; abdomen apice cervinum; pedes supra rosei; ala lineis duabus obscurioribus rectte. . . This item ships from La Vergne,TN., RareBooksClub<