Relevant bibliographies by topics / Topographic map refinement

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Academic literature on the topic 'Topographic map refinement'

Author: Grafiati
Published: 4 June 2021
Last updated: 11 February 2022

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Journal articles on the topic "Topographic map refinement"

1

Müller, Nicolas I. C., Mandy Sonntag, Ayse Maraslioglu, Jan J. Hirtz, and Eckhard Friauf. "Topographic map refinement and synaptic strengthening of a sound localization circuit require spontaneous peripheral activity." Journal of Physiology 597, no. 22 (October 26, 2019): 5469–93. http://dx.doi.org/10.1113/jp277757.

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Ichijo, Hiroyuki. "Differentiation of the chick retinotectal topographic map by remodeling in specificity and refinement in accuracy." Developmental Brain Research 117, no. 2 (November 1999): 199–211. http://dx.doi.org/10.1016/s0165-3806(99)00126-1.

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VO, BRADLY Q., A. JOSEPH BLOOM, and SUSAN M. CULICAN. "Phr1 is required for proper retinocollicular targeting of nasal–dorsal retinal ganglion cells." Visual Neuroscience 28, no. 2 (February 16, 2011): 175–81. http://dx.doi.org/10.1017/s0952523810000386.

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AbstractPrecise targeting of retinal projections is required for the normal development of topographic maps in the mammalian primary visual system. During development, retinal axons project to and occupy topographically appropriate positions in the dorsal lateral geniculate nucleus (dLGN) and superior colliculus (SC). Phr1 retinal mutant mice, which display mislocalization of the ipsilateral retinogeniculate projection independent of activity and ephrin-A signaling, were found to have a more global disruption of topographic specificity of retinofugal inputs. The retinocollicular projection lacks local refinement of terminal zones and multiple ectopic termination zones originate from the dorsal–nasal (DN) retinal quadrant. Similarly, in the dLGN, the inputs originating from the contralateral DN retina are poorly refined in the Phr1 mutant. These results show that Phr1 is an essential regulator of retinal ganglion cell projection during both dLGN and SC topographic map development.
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Hirtz, J. J., N. Braun, D. Griesemer, C. Hannes, K. Janz, S. Lohrke, B. Muller, and E. Friauf. "Synaptic Refinement of an Inhibitory Topographic Map in the Auditory Brainstem Requires Functional CaV1.3 Calcium Channels." Journal of Neuroscience 32, no. 42 (October 17, 2012): 14602–16. http://dx.doi.org/10.1523/jneurosci.0765-12.2012.

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Grumpe, A., C. Schröer, S. Kauffmann, T. Fricke, C. Wöhler, and U. Mall. "REFINEMENT OF STEREO IMAGE ANALYSIS USING PHOTOMETRIC SHAPE RECOVERY AS AN ALTERNATIVE TO BUNDLE ADJUSTMENT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B4 (June 14, 2016): 565–72. http://dx.doi.org/10.5194/isprsarchives-xli-b4-565-2016.

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Topographic mapping, e.g. the generation of Digital Elevation Models (DEM), is of general interest to the remote sensing community and scientific research. Commonly, photogrammetric methods, e.g. stereo image analysis methods (SIAM) or bundle adjustment methods (BAM), are applied to derive 3D information based on multiple images of an area. These methods require the detection of control points, i.e. common points within multiple images, which relies on a similarity measure and usually yields a sparse map of 3D points. The full spatial DEM is then obtained by interpolation techniques or imposed restrictions, e.g. smoothness constraints. Since BAM utilizes all images of the area, it is assumed to provide a more accurate DEM than SIAM which utilizes only pairs of images. Intensity-based shape recovery, e.g. shape from shading (SfS), utilizes the reflectance behavior of the object surface and thus provides a dense map of relative height changes, which provide the possibility to refine the photogrammetric DEMs. Based on Rosetta NavCam images of 67P/Churyumov-Gerasimenko we compare intensity-based DEM refinement methods which use DEMs obtained based on SIAM and BAM as a reference. We show that both the SIAM based DEM refinement and the BAM based DEM refinement are of similar quality. It is thus possible to derive DEMs of high lateral resolution by applying the intensity-based refinement to the less complex SIAM.
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Grumpe, A., C. Schröer, S. Kauffmann, T. Fricke, C. Wöhler, and U. Mall. "REFINEMENT OF STEREO IMAGE ANALYSIS USING PHOTOMETRIC SHAPE RECOVERY AS AN ALTERNATIVE TO BUNDLE ADJUSTMENT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B4 (June 14, 2016): 565–72. http://dx.doi.org/10.5194/isprs-archives-xli-b4-565-2016.

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Topographic mapping, e.g. the generation of Digital Elevation Models (DEM), is of general interest to the remote sensing community and scientific research. Commonly, photogrammetric methods, e.g. stereo image analysis methods (SIAM) or bundle adjustment methods (BAM), are applied to derive 3D information based on multiple images of an area. These methods require the detection of control points, i.e. common points within multiple images, which relies on a similarity measure and usually yields a sparse map of 3D points. The full spatial DEM is then obtained by interpolation techniques or imposed restrictions, e.g. smoothness constraints. Since BAM utilizes all images of the area, it is assumed to provide a more accurate DEM than SIAM which utilizes only pairs of images. Intensity-based shape recovery, e.g. shape from shading (SfS), utilizes the reflectance behavior of the object surface and thus provides a dense map of relative height changes, which provide the possibility to refine the photogrammetric DEMs. Based on Rosetta NavCam images of 67P/Churyumov-Gerasimenko we compare intensity-based DEM refinement methods which use DEMs obtained based on SIAM and BAM as a reference. We show that both the SIAM based DEM refinement and the BAM based DEM refinement are of similar quality. It is thus possible to derive DEMs of high lateral resolution by applying the intensity-based refinement to the less complex SIAM.
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7

Mangla, R., and S. Kumar. "DEM Construction using DInSAR." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XL-8 (November 28, 2014): 817–20. http://dx.doi.org/10.5194/isprsarchives-xl-8-817-2014.

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A digital elevation model (DEM) is a 3D visualization of a terrain surface. It can be used in various analytical studies such as topographic feature extraction, hydrology, geomorphology and landslides analysis etc. Uttrakhand region is affected with landslides, earthquake and flash flood phenomenon. Hence this study was focused on DEM generation using Differential SAR Interferometry (DINSAR) on ALOS PALSAR dataset. Two Pass DINSAR technique involves one interferometric pair in addition with an external DEM. The external DEM was used as a reference to reduce topographic errors. The data processing steps were image co-registration, interferogram generation, interferogram flattening (Differential Interferogram), interferogram filtering, coherence map, phase unwrapping, orbital refinement and re-flattening and DEM generation. Interferogram fringes observed in forest areas were due to temporal decorrelation and the fringes in mountain regions were obtained due to topography changes (may be due to landslides in rainy season). The range of elevation in generated DEM were 132 m to 2823 m and Root Mean Square Error (RMSE) error was 36.765159 m. The generated DEM was compared with ASTER DEM and variation in height was analyzed. Atmospheric effects were not removed due to geometrical and temporal decorrelation which affect the accuracy.
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Pienkowski, Martin, and Robert V. Harrison. "Tone Frequency Maps and Receptive Fields in the Developing Chinchilla Auditory Cortex." Journal of Neurophysiology 93, no. 1 (January 2005): 454–66. http://dx.doi.org/10.1152/jn.00569.2004.

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Single-unit responses to tone pip stimuli were isolated from numerous microelectrode penetrations of auditory cortex (under ketamine anesthesia) in the developing chinchilla ( laniger), a precocious mammal. Results are reported at postnatal day 3 (P3), P15, and P30, and from adult animals. Hearing sensitivity and spike firing rates were mature in the youngest group. The topographic representation of sound frequency (tonotopic map) in primary and secondary auditory cortex was also well ordered and sharply tuned by P3. The spectral-temporal complexity of cortical receptive fields, on the other hand, increased progressively (past P30) to adulthood. The (purported) refinement of initially diffuse tonotopic projections to cortex thus seems to occur in utero in the chinchilla, where external (and maternal) sounds are considerably attenuated and might not contribute to the mechanism(s) involved. This compares well with recent studies of vision, suggesting that the refinement of the retinotopic map does not require external light, but rather waves of (correlated) spontaneous activity on the retina. In contrast, it is most probable that selectivity for more complex sound features, such as frequency stacks and glides, develops under the influence of the postnatal acoustic environment and that inadequate sound stimulation in early development (e.g., due to chronic middle ear disease) impairs the formation of the requisite intracortical (and/or subcortical) circuitry.
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Ramanathan, Dhakshin S., James M. Conner, Arjun A. Anilkumar, and Mark H. Tuszynski. "Cholinergic systems are essential for late-stage maturation and refinement of motor cortical circuits." Journal of Neurophysiology 113, no. 5 (March 1, 2015): 1585–97. http://dx.doi.org/10.1152/jn.00408.2014.

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Previous studies reported that early postnatal cholinergic lesions severely perturb early cortical development, impairing neuronal cortical migration and the formation of cortical dendrites and synapses. These severe effects of early postnatal cholinergic lesions preclude our ability to understand the contribution of cholinergic systems to the later-stage maturation of topographic cortical representations. To study cholinergic mechanisms contributing to the later maturation of motor cortical circuits, we first characterized the temporal course of cortical motor map development and maturation in rats. In this study, we focused our attention on the maturation of cortical motor representations after postnatal day 25 (PND 25), a time after neuronal migration has been accomplished and cortical volume has reached adult size. We found significant maturation of cortical motor representations after this time, including both an expansion of forelimb representations in motor cortex and a shift from proximal to distal forelimb representations to an extent unexplainable by simple volume enlargement of the neocortex. Specific cholinergic lesions placed at PND 24 impaired enlargement of distal forelimb representations in particular and markedly reduced the ability to learn skilled motor tasks as adults. These results identify a novel and essential role for cholinergic systems in the late refinement and maturation of cortical circuits. Dysfunctions in this system may constitute a mechanism of late-onset neurodevelopmental disorders such as Rett syndrome and schizophrenia.
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Dou, A. X., X. X. Yuan, X. Q. Wang, and Z. M. Li. "REFINEMENT METHOD FOR RESIDENTIAL AREA REVISION USING REMOTE SENSING IMAGE AND GIS DATA IN EARTHQUAKE RISK ASSESSMENT." ISPRS - International Archives of the Photogrammetry, Remote Sensing and Spatial Information Sciences XLI-B8 (June 22, 2016): 51–54. http://dx.doi.org/10.5194/isprsarchives-xli-b8-51-2016.

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This paper proposes an automatic approach for residential areas revision by means of analysing the correlation between the residential area and the topographic and geographical factors. The approach consists of four major steps: the extracting of missing residential area from the remote sensing images with high resolution; the statistic analysing on the size changes of missing residential area in each grade of the elevation, slope, distance from the road and other impact factors; modelling of residential area modification in the urban and rural region; testing the methods using 100 counties data which are located in the middle part of China North-South Seismic Belt and comparing the result to the Land Use in map scale 1:100000. The experimental results present the accuracy of urban residents by 70% increased to 89.4%, rural residents by 47% up to 81.9%, rural residents from 8% increased to 78.5%. Therefore, there is available risk exposure information in a sparsely populated area because the spatial grid distributions of population and buildings are based on the residential areas. The proposed approach in this paper will improve the accuracy of the seismic risk assessment if it is applied to the national or the whole world.
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Dissertations / Theses on the topic "Topographic map refinement"

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Woodbury, Greg. "Modelling Emergent Properties of the Visual Cortex." University of Sydney. School of Mathematics and Statistics, 2003. http://hdl.handle.net/2123/695.

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Conference papers on the topic "Topographic map refinement"

1

Keaton, Jeffrey R., Luther H. Boudra, and Eleanor L. Huggins. "Enhancing Pipeline Project Management With Refined Rock Excavation Forecasting." In 2016 11th International Pipeline Conference. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/ipc2016-64306.

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Accurate rock-excavation forecasting is one of the geotechnical risk factors that challenge successful management of cross-country pipeline projects. Pipeline construction personnel with local experience typically estimate rock excavation requirements for economic feasibility, permitting, and contracts. Where the excavation is paid on a “classified” basis, construction bid and contract documents typically call for excavation of “ditch” rock to be paid per lineal foot, whereas “area” or right-of-way (ROW) grading rock is paid per cubic yard. This paper briefly reviews the desktop procedure for estimating rock excavation quantities presented at IPC2012 and describes refinements to the procedure that expand its utility for pipeline project managers and planners. Input for the desktop study consists of digital GIS files of topography, geology, soil survey, pipeline alignment, and construction ROW layout and width. Publically available topographic data commonly has a horizontal resolution of 10-m; therefore, the pipeline centerline is subdivided into 10-m-long segments, the endpoints of which are used to summarize the data and perform calculations. Profiles of elevation, maximum ground slope, apparent ground slope across the ROW perpendicular to segment alignment (sidehill slope), and the relative sidehill slope direction are plotted for visual reference. A virtual geologic field reconnaissance along the alignment is performed using Google Earth Pro to supplement digital geology and soil survey data. Bedrock type is interpreted for general ease of excavation (granite versus shale) and soil survey map units are used to identify shallow cemented zones or bedrock that form the basis for an overall rock excavation index factor, which is expressed in terms of estimated mean and standard deviation of depth to rock and rock-like material. Rock factors vary based on the range of pipe size and ground conditions for a particular pipeline project or segment. Rock Factor 0 on a recent project corresponded to a mean-minus-one standard deviation (−1σ) depth to rock that was below pipeline depth, whereas Rock Factor 3 corresponded to a −1σ rock depth that was above pipeline depth. Refined rock excavation calculations consider equipment parameters (boom reach, track offset), trench configuration parameters (working pad width, bench offset, two-tone geometry), centerline distance to adjacent pipelines, and direction of lay, as well as pipe diameter and minimum cover depth. Desktop rock excavation results can be further refined by field examination and seismic refraction surveys to check depth to blast rock in trench excavations which is interpreted to be seismic velocities >1,220 to 1,370 m/s. Construction records of actual blasting details are needed to further improve the rock excavation model.
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Hengesh, James V., Michael Angell, William R. Lettis, and Jeffery L. Bachhuber. "A Systematic Approach for Mitigating Geohazards in Pipeline Design and Construction." In 2004 International Pipeline Conference. ASMEDC, 2004. http://dx.doi.org/10.1115/ipc2004-0147.

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Pipeline projects are often faced with the challenge of balancing efficient design and construction with mitigation of potential hazards posed by low probability events, such as earthquakes and landslides. Though systematic characterization of geological hazards is sometimes perceived as an added project expense, failure to recognize and mitigate hazards at an early stage can lead to schedule delays and substantial liability, repair, and business interruption costs. For example, it is estimated that failure of the 660-mm Trans-Ecuador pipeline in the 1987 earthquake cost roughly $850 million in repairs and lost revenue. In order to minimize, mitigate, or avoid geological hazards, pipeline design projects can implement a phased investigative approach to refine route selection and develop parameters for detailed design. These studies provide information on geological conditions that progress from the general to specific and have associated uncertainties that decrease with increasing focus of investigations. A geohazard investigation for a pipeline project should begin with a Phase I “desk-top” study to evaluate regional geological conditions, establish a project specific information system, and make a preliminary assessment of landslide, fault rupture, liquefaction, geotechnical and constructability issues that will need to be considered in later phases of design and construction. Although the results of desk-top studies are limited and have large associated uncertainties, the initial results help to refine route selection and/or identify areas that may require hazard mitigation measures. Phase II investigations include acquisition of detailed corridor specific data such as topography and aerial photography, development of geological strip maps, and assessment of the pipeline corridor by an expert-level Terrain Evaluation Team (TET) with broad knowledge of geo-engineering issues. Assessment of the corridor by the TET results in recommendations for route refinement to avoid hazardous terrain, and identification of areas requiring detailed Phase III investigations. Phase III consists of detailed investigations of critical geohazard features to develop parameters for final design of hazard mitigation measures (e.g. fault crossing design). The geohazard features are characterized to determine permanent ground deformation (PGD) parameters, such as location, geometry, amount and direction of displacement, and recurrence rates. Interaction with the pipeline design team should be continued through all three phases to maximize efficiency and ensure timely integration of results in route selection, refinement and design. Examples provided from projects in Turkey, California, and the Indian Ocean demonstrate the successful implementation of this phased investigative approach to characterizing and mitigating geohazards for both onshore and offshore pipeline projects. Implementation of this approach has resulted in significant project cost savings and reduced risk.
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