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Airborne LiDAR sensorstuaj yeem ntes cov ntsiab lus tshwj xeeb los ntawm lub laser pulse, lub npe hu ua kev ntsuas rov qab tsis sib xws, lossis sau cov teeb liab tiav thaum nws rov qab los, hu ua full-waveform, ntawm lub sijhawm tas li zoo li 1 ns (uas npog txog 15 cm). Tag Nrho-waveform LiDAR feem ntau yog siv rau hauv hav zoov, thaum discrete rov qab LiDAR muaj ntau daim ntawv thov nyob rau hauv ntau yam teb. Kab lus no feem ntau tham txog kev rov qab los LiDAR thiab nws cov kev siv. Hauv tshooj no, peb yuav hais txog ntau lub ntsiab lus tseem ceeb txog LiDAR, suav nrog nws cov khoom siv yooj yim, nws ua haujlwm li cas, nws qhov tseeb, cov tshuab, thiab cov peev txheej muaj.
Basic Cheebtsam ntawm LiDAR
Hauv av-raws li LiDAR systems feem ntau siv lasers nrog wavelengths ntawm 500-600 nm, thaum huab cua LiDAR systems siv lasers nrog ntev wavelengths, xws li ntawm 1000-1600 nm. Kev teeb tsa huab cua LiDAR suav nrog lub laser scanner, chav ntsuas ntsuas qhov deb (nruab nrab), thiab cov tshuab rau kev tswj hwm, saib xyuas, thiab kaw. Nws kuj tseem suav nrog Qhov Sib Txawv Ntiaj Teb Kev Pom Zoo (DGPS) thiab Inertial Measurement Unit (IMU), feem ntau koom ua ke rau hauv ib qho system hu ua txoj haujlwm thiab kev taw qhia. Lub kaw lus no muab qhov tseeb qhov chaw (longitude, latitude, thiab qhov siab) thiab kev taw qhia (yob, suab, thiab nqe lus) cov ntaub ntawv.
Cov qauv uas lub laser scans cheeb tsam yuav txawv, nrog rau zigzag, parallel, los yog elliptical paths. Kev sib xyaw ua ke ntawm DGPS thiab IMU cov ntaub ntawv, nrog rau cov ntaub ntawv calibration thiab mounting tsis, tso cai rau lub kaw lus kom raug cov ntsiab lus laser sau. Cov ntsiab lus no tom qab ntawd muab cov kev tswj xyuas (x, y, z) hauv thaj chaw sib koom ua ke siv World Geodetic System of 1984 (WGS84) datum.
LiDAR li casChaw Taws Teeb Pom KevUa haujlwm? Piav hauv Txoj Kev Yooj Yim
Lub LiDAR system tso tawm sai sai laser pulses ntawm lub hom phiaj khoom lossis nto.
Lub laser pulses qhia tawm lub hom phiaj thiab rov qab mus rau LiDAR sensor.
Lub sensor meej meej ntsuas lub sijhawm nws siv rau txhua tus mem tes mus rau lub hom phiaj thiab rov qab.
Siv qhov ceev ntawm lub teeb thiab lub sij hawm mus ncig, qhov kev ncua deb ntawm lub hom phiaj yog xam.
Ua ke nrog txoj haujlwm thiab kev taw qhia cov ntaub ntawv los ntawm GPS thiab IMU sensors, qhov tseeb 3D kev tswj hwm ntawm laser reflections raug txiav txim.
Qhov no ua rau muaj huab cua 3D tuab sawv cev rau qhov chaw scanned lossis khoom.
Physical Principple of LiDAR
LiDAR tshuab siv ob hom lasers: pulsed thiab nruam nthwv dej. Pulsed LiDAR systems ua haujlwm los ntawm kev xa tawm lub teeb mem tes luv luv thiab tom qab ntawd ntsuas lub sijhawm nws siv rau lub mem tes no mus rau lub hom phiaj thiab rov qab mus rau lub receiver. Qhov kev ntsuas ntawm lub sijhawm ncig mus ncig yuav pab txiav txim siab qhov kev ncua deb mus rau lub hom phiaj. Ib qho piv txwv yog qhia nyob rau hauv daim duab uas lub amplitudes ntawm ob qho tib si kis tau tus mob teeb liab (AT) thiab tau txais lub teeb liab (AR) tshwm sim. Cov kab zauv yooj yim siv hauv qhov system no suav nrog qhov ceev ntawm lub teeb (c) thiab qhov deb ntawm lub hom phiaj (R), tso cai rau lub kaw lus xam qhov kev ncua deb raws li nws siv sijhawm ntev npaum li cas rau lub teeb rov qab.
Discrete rov qab thiab tag nrho-waveform ntsuas siv huab cua LiDAR.
Ib lub dav hlau dav hlau LiDAR system.
Cov txheej txheem ntsuas hauv LiDAR, uas txiav txim siab ob qho tib si lub ntes thiab cov yam ntxwv ntawm lub hom phiaj, yog sau los ntawm tus qauv LiDAR sib npaug. Qhov kev sib npaug no yog hloov los ntawm qhov sib npaug ntawm radar thiab yog qhov tseem ceeb hauv kev nkag siab yuav ua li cas LiDAR systems xam qhov deb. Nws piav qhia txog kev sib raug zoo ntawm lub zog ntawm lub teeb liab kis tau tus mob (Pt) thiab lub zog ntawm lub teeb liab tau txais (Pr). Qhov tseem ceeb, qhov sib npaug yuav pab kom muaj nuj nqis ntau npaum li cas ntawm lub teeb xa mus rau lub receiver tom qab xav txog lub hom phiaj, uas yog qhov tseem ceeb rau kev txiav txim siab nyob deb thiab tsim cov duab qhia tseeb. Qhov kev sib raug zoo no coj mus rau hauv tus account yam xws li teeb liab attenuation vim nyob deb thiab kev cuam tshuam nrog lub hom phiaj nto.
Daim ntawv thov ntawm LiDAR Chaw Taws Teeb Pom Kev
LiDAR tej thaj chaw deb sensing muaj ntau daim ntawv thov nyob rau hauv ntau yam teb:
Terrain and topographic maping for tsim high-resolution digital elevation model (DEMs).
Forestry thiab zaub daim ntawv qhia kev kawm txog tsob ntoo canopy qauv thiab biomass.
Coastal and shoreline maping for monitoring erosion and sea-level hloov.
Kev npaj hauv nroog thiab kev tsim qauv tsim vaj tsev, nrog rau cov tsev thiab kev thauj mus los.
Archaeology thiab kab lis kev cai cuab yeej cuab tam cov ntaub ntawv ntawm keeb kwm chaw thiab artifacts.
Geological thiab mining kev tshawb fawb rau daim phiaj saum npoo nta thiab saib xyuas kev ua haujlwm.
Autonomous tsheb navigation thiab teeb meem nrhiav pom.
Kev tshawb nrhiav Planetary, xws li daim ntawv qhia saum npoo ntawm Mars.
Xav Tau Kev Pab Cuam Dawb?
LiDAR Resources:
Ib daim ntawv teev npe tsis tiav ntawm LiDAR cov ntaub ntawv thiab cov software dawb yog muab hauv qab no.LiDAR cov ntaub ntawv:
1.Qhib Topographyhttp://www.opentopography.org
2.USGS Earth Explorerhttp://earthexplorer.usgs.gov
3.United States Interagency Elevation Inventoryhttps://coast.noaa.gov/ inventory/
4.National Oceanic and Atmospheric Administration (NOAA)Digital Coasthttps://www.coast.noaa.gov/dataviewer/#
5.Wikipedia LiDARhttps://en.wikipedia.org/wiki/National_Lidar_Dataset_(United_States)
6.LiDAR Onlinehttp://www.lidar-online.com
7.National Ecological Observatory Network-NEONhttp://www.neonscience.org/data-resources/get-data/airborne-data
8.LiDAR Cov Ntaub Ntawv rau Northern Spainhttp://b5m.gipuzkoa.net/url5000/en/G_22485/PUBLI&consulta=HAZLIDAR
9.LiDAR Data for the United Kingdomhttp://catalogue.ceda.ac.uk/ list/?return_obj=ob&id=8049, 8042, 8051, 8053
Dawb LiDAR Software:
1.Yuav tsum tau ENVI. http://bcal.geology.isu.edu/ Envitools.shtml
2.FugroViewer(rau LiDAR thiab lwm cov ntaub ntawv raster/vector) http://www.fugroviewer.com/
3.FUSION/LDV(LiDAR data visualization, conversion, thiab tsom xam) http://forsys.cfr.washington.edu/fusion/fusionlatest.html
4.LAS Tools(Code thiab software rau kev nyeem thiab sau LAS cov ntaub ntawv) http://www.cs.unc.edu/~isenburg/lastools/
5.LASUtility(Ib txheej ntawm GUI kev siv hluav taws xob rau kev pom thiab hloov pauv ntawm LASfilles) http://home.iitk.ac.in/~blohani/LASUtility/LASUtility.html
6.LibLAS(C/C++ lub tsev qiv ntawv rau kev nyeem ntawv / sau ntawv LAS) http://www.liblas.org/
7.MCC-LiDAR(Multi-scale curvature classification for LiDAR) http://sourceforge.net/projects/mcclidar/
8.MARS FreeView(3D visualization ntawm LiDAR cov ntaub ntawv) http://www.merrick.com/Geospatial/Software-Products/MARS-Software
9.Kev Ntsuam Xyuas Tag Nrho(Qhib qhov software rau kev ua thiab pom LiDARpoint huab thiab waveforms) http://fullanalyze.sourceforge.net/
10.Point Huab Khawv koob (A set of software tools for LiDAR point cloud visualiza-tion, editing, filtering, 3D building modeling, and statistical analysis in forestry/ vegetation applications. Contact Dr. Cheng Wang at wangcheng@radi.ac.cn)
11.Quick Terrain Reader(Visualization ntawm LiDAR point clouds) http://appliedimagery.com/download/ Ntxiv LiDAR software cov cuab yeej tuaj yeem nrhiav tau los ntawm Open Topography ToolRegistry webpage ntawm http://opentopo.sdsc.edu/tools/listTools.
Kev lees paub
- Tsab ntawv xov xwm no suav nrog kev tshawb fawb los ntawm "LiDAR Remote Sensing and Applications" los ntawm Vinícius Guimarães, 2020. Cov ntawv tag nrho yog muajntawm no.
- Cov npe no thiab cov lus piav qhia ntxaws ntxaws ntawm LiDAR cov ntaub ntawv thiab cov software dawb muab cov cuab yeej tseem ceeb rau cov kws tshaj lij thiab cov kws tshawb fawb hauv thaj chaw ntawm kev paub txog tej thaj chaw deb thiab kev txheeb xyuas thaj chaw.
Tsis lees paub:
- Peb tau tshaj tawm tias qee cov duab tso tawm hauv peb lub vev xaib tau raug sau los ntawm Is Taws Nem rau lub hom phiaj ntawm kev txhawb nqa kev kawm thiab kev sib qhia cov ntaub ntawv. Peb hwm txoj cai kev txawj ntse ntawm txhua tus tsim thawj. Kev siv cov duab no tsis yog rau kev lag luam nce.
- Yog tias koj ntseeg tias ib qho ntawm cov ntsiab lus siv ua txhaum cai ntawm koj txoj cai, thov hu rau peb. Peb txaus siab los ua cov kev ntsuas tsim nyog, suav nrog kev tshem tawm cov duab lossis muab cov khoom tsim nyog, txhawm rau ua raws li cov cai lij choj thiab cov cai. Peb lub hom phiaj yog los tuav lub platform uas muaj cov ntsiab lus nplua nuj, ncaj ncees, thiab hwm lwm tus txoj cai kev txawj ntse.
- Please contact us through the following contact information, email: sales@lumispot.cn. We promise to take immediate action upon receipt of any notice and guarantee 100% cooperation to resolve any such issues.
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Post lub sij hawm: Apr-16-2024