LiDAR Articles
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A methodology for processing raw LiDAR data to support urban flood modelling framework
An assessment has been carried out to study the performance of seven different LiDAR filtering algorithms and to evaluate their suitability for urban flood modelling applications. It was found that none of these algorithms can be regarded as fully suitable to support such work in its present form. The paper presents the augmentation of an existing Progressive Morphological filtering algorithm for ...
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Evaluation of dispersion model parameters by dual Doppler lidars over West London, England
Urban dispersion models have parameters for the turbulence and mixing height. We identify the parameters in meteorological pre-processors, which are, in principle, measurable by pulsed Doppler lidar. This technique measures radial velocity from the Doppler shifted wavelengths of backscattered laser pulses. First results obtained from single and dual lidar operations are described. Using two ...
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Ditch network extraction and hydrogeomorphological characterization using LiDAR-derived DTM in wetlands
While much emphasis has been placed on the importance of hydrology as a driving force for wetlands, few small stream drainage networks have been mapped. Light Detection and Ranging (LiDAR) data can provide very high-precision topographic maps over large areas, and have been used to extract drainage networks in forested areas, vineyards, and high mountain pastures. The study objective is to ...
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An application of backscatter Lidar to model the odour nuisance arising from aircraft tyre smoke
A Rapid-Scanning Backscatter Lidar (RASCAL) has been deployed at Heathrow and Manchester Airports to collect backscatter data from particulate emissions in the wakes of several hundred flights. The principal aim of these measurements was to characterise the dispersion of the engine exhausts, but it was found that tyre smoke was also visible, giving a signal substantially greater than that from ...
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WISPR Accuracy Study - RESEPI M2X vs. XT-32
Introduction What is a LiDAR Payload? LiDAR stands for Light Detection and Ranging and has become an increasingly prevalent technology over the past decade. NASA and meteorologists have used LiDAR, now embedded within cell phones with the release of the iPhone 12 Pro. LiDAR is commonly used in surveying, mapping, and inspection applications where it can provide very detailed and accurate ...
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Generating meshes for tidal wetland modeling using light detection and ranging (LiDAR) data
A high resolution model mesh was required to numerically simulate sediment transport in tidal marshes. The timing of flooding is dependent on the tidal marsh ground elevation, which requires accurate topographic elevation data. The tidal prism of the marsh is determined by the volume provided by tidal channels in the system. Hence, their location and bathymetry needed to be represented ...
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Validation of the ADMS dispersion model and assessment of its performance relative to R-91 and ISC using archived LIDAR data
Regulatory authorities have traditionally used Gaussian dispersion models, notably R-91 in the UK and ISC in the USA. These use dispersion coefficients derived from the Pasquill stability category calculated for the prevailing meteorological conditions. Recently, ADMS (Atmospheric Dispersion Modelling System) has been developed; this is one of a new generation of dispersion models in which the ...
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Micro Pulse LiDAR: Perfect Tool for Atmospheric Research
Micro pulse style lidars are active remote sensing tools proven to be highly useful in atmospheric research. This style of backscatter lidar has been around for decades; however, incremental improvements in photon counting, sensitivity, polarization, optical filters, coatings, and precision machining of each element support increasingly accurate analysis. Each iteration of the sensor provides a ...
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Large-scale flooding analysis in the suburbs of Tokyo Metropolis caused by levee breach of the Tone River using a 2D hydrodynamic model
In order to assess the effects of climate change on flood disasters in urban areas, we applied a two dimensional finite element hydrodynamic model (2D-FEM) to simulate flood processes for the case analysis of levee breach caused by Kathleen Typhoon on 16 September 1947 in Kurihashi reach of Tone River, upstream of Tokyo area. The purpose is to use the model to simulate flood inundation processes ...
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Project - Compton Creek and Dominguez Channel Flood Mitigation Study
Los Angeles County Flood Control District Overview HEC-HMS model of 110 sq. mi. urban watersheds Development of custom LiDAR processing tools "What-if" mitigation scenarios analyzed Applied Software WMS (HEC-HMS, MODRAT, XPSWMM) SMS (TUFLOW) Problem A study conducted by Los Angeles County Flood Control District determined that some of the levees along Compton Creek and Dominguez ...
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Civil & Environmental Consultants, Inc. - Case Study
Water resource experts and leads at CEC, Matt Gramza and Steve Casey, sat down with CivilGEO’s engineering director, Chris Maeder, to share how CivilGEO’s software products have helped CEC amp up its game and achieve new levels of productivity with river analysis and storm water modeling work. Matt Gramza described some inefficiencies the firm routinely encountered when using ...
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Year‐Round In Situ Measurements of Arctic Low‐Level Clouds: Microphysical Properties and Their Relationships with Aerosols
Abstract Two years of continuous in situ measurements of Arctic low-level clouds have been made at the Mount Zeppelin Observatory (78°56'N, 11°53'E), in Ny-Alesund, Spitsbergen. The monthly median value of the cloud particle number concentration (Nc) showed a clear seasonal variation: Its maximum appeared in May-July (65 ± 8 cm" ), and it remained low between October and March (8 ...
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Modelling dispersion of smoke from wildfires in a Mediterranean area
We present a modelling system for the estimation of forest fire emissions ( prebolchem-fire ) and their inclusion in the atmospheric composition model BOLCHEM. Emission fluxes have been estimated following the methodology proposed by Seiler and Crutzen (1980) and using MODIS ‘burned area product’. Then they are modulated following the WRAP approach (WRAP, 2005). This approach is also used for ...
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Weather monitoring in extreme conditions
A VENTUS X ultrasonic wind sensor has been deployed by researchers at the Summit Station on the Greenland Ice Sheet in the Arctic, 10,000 feet above sea level, as part of a project investigating the role of aerosols in cloud formation. With integrated heaters and no moving parts, the wind sensor does not require recalibration – a vital feature of equipment in one of the most remote ...
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ADMS 5 Flat Terrain Validation Kincaid, Indianapolis and Prairie Grass
1 Introduction This document presents a summary of ADMS model results compared against three well known field data sets: Prairie Grass. Kincaid and Indianapolis. Results are also presented for two U.S. models: ISCST and AERMOD. ISC ST is the United States Environmental Protection Agency model. It is a so-called 'old generation' model, similar to the UK R-91 model, based on the 1970's ...
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Micro Pulse LiDAR: A Critical Tool for Emission Source Detection
Micro Pulse LiDAR remote sensing data are used to calculate a highly accurate Planetary Boundary Layer (PBL) height to improve plume models that help assess emissions sources. Poor air quality is a growing health issue that has a negative impact on the quality of life for millions of people. To help alleviate this serious problem, scientists at Bubbleology Research International (BRI) have ...
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Accurate PBL Simulation Helps Model Urban Pollution
Atmospheric transport models benefit from real-time localized data inputs. Deteriorating air quality in urban areas is causing growing concern about public health and climate change. To gain a better understanding of air pollution and greenhouse gas (GHG) emissions, some cities and states are attempting to establish a baseline and collect data over time to track changing conditions. By comparing ...
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City of Billings: Complex Floodplain Issues - Case Study
In 1937, a major flood of Yellowstone River tributaries devastated Billings, Montana. Despite the vulnerability of the community that this event revealed, the floodplain was not accurately delineated for decades. The reason for this delay in mapping was due to two factors: 1) lack of available funding and 2) exceedingly complex flow patterns in the developed floodplain. Recently, however, a ...
By Innovyze
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Flood modeling and mitigation measures in an Urban Environment –Victoria, Australia - Case Study
Abstract Accurate prediction of flood extents in urban catchments is extremely difficult without having a 1d/2d integrated modeling approach. The integrated flood modeling is becoming popular and a new benchmark for urban flood risk management studies. City of Glen Eira in Victoria, Australia is a developed metropolitan municipality. The council is responsible for the management of 535km of ...
By Innovyze
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