
kazhchakal vishakalanam

viewshed vishakalanam ennathu oru nischitha sthalathu ninnu (adisthaana bhoopradesha uparithalathil) drishyamaakunna oru viewshed, pradesham vivarikkunna oru computational algorithamaanu. mikka bhoomishaasthraparamaaya vivara samvidaana (gis) softweyarukalilum kaanapedunna bhoopradesha vishakalana toolsettinte oru saadhaarana bhaagamaanith. oru prathyeka koshatthilekko athil ninno drishyaparatha nirnnayikkaan digital elevation modalinte (deme) oro koshatthinteyum elevation moolyam vishakalanam upayogikkunnu. vishakalanathinte aavashyangale aashrayich eee prathyeka koshatthinte sthaanam vyathyaasappedunnu. 
udaaharanathinu, ashayavinimaya gopurangal kandethunnathino roadle ninnulla kazhcha nirnnayikkunnathino oru viewshed vishakalanam saadhaaranayaayi upayogikkunnu. oru gopuram polulla oru vyakthigatha poyinto roadine prathinidheekarikkunna oru line polulla onniladhikam poyintukaloo upayogichu viewshedukal kanakkakkaam. oru line segment vishakalanam cheyyumbol, line kurukeyulla oro shringavum athinte drishyamaaya vistheernnam nirnnayikkunnathinaayi kanakkakkunnu. eee prakriya thirichedukkaam. udaaharanathinu, oru landfill kandethumbol, vishakalanathin landfill evide ninnu drishyamaakumennu nirnnayikkaan kazhiyum, athu kaazhchayil ninnu marachuvekkaan kazhiyum.
viewsed vishakalana prakriya.
archis proo, grass giss (aarr.loss, aarr.viewshed), cujis (viewshed pluggin), lutiadlitespeed, luciadmobile, saaga giss (drishyaparatha), tnt mips, aarkmaap, maptitude, erdas imajin. oru sellil ninnu (vyoopoyint sell) aduthathilekkulla (taargett sell) uyarathinte vyathyasam kanakkaakkunna oru algoritam upayogichaanu oru demil ninnu oru viewshed srishtikkunnathu. oru taargett sellinte drishyaparatha nirnnayikkunnathin, vyoopoyint sellinum taargett sellinum edayilulla oro sellum line oof saittinaayi parishodhikkunnu. kazhcha pooyintinum taargett sellukalkkum idayil uyarnna moolyamulla cellukal ullidathu kaazhchayude rekha thadayappedunnu. kaazhchayude rekha thadanjuvechaal taargett sell vyooshedinte bhagamallennu nirnnayikkappedunnu. athu block cheythittillenkil athu viewshedil ulppeduthum.
algoritam oru nischitha koottam variabilukale adisthaanamaakkiyullathaanu. oru viewshed vishakalanam nadathumbol, kanakkukoottal parimithappeduthunnathino krameekarikkunnathino niravadhi variableukal upayogikkaam. udaaharanathinu, oru radio gopuratthinte sthaanam nirnnayikkaanaan vishakalanam cheiyukayaanenkil, gopuratthinte uyaram aaa sthalathinte uyarathilekku (sell moolyam) cherkkaan kazhiyum. uyaram nalkiyittillenkil, viewshed vishakalanam gopuram sthithicheyyunna deminte sell moolyam upayogikkunnu.
gopuratthinte uyaram koottaanulla mattoru maarggam oru offset variable upayogikkuka ennathaanu. oru sending towerilum oru reseaving towerilum offset moolyangal cherkkaan kazhiyum. oro gopuratthinteyum yadhaartha uyaram labhikkunnathin offset moolyam sellinte uyara moolyathilekku cherkkunnu.
viewshed vishakalanathin parimithamaaya view angle undayirikkaam. radio gopuratthinte viewing angle allengil asimat rund moolyangal cherthu kanakkukoottalil ulppeduthaam. aadya moolyam saadhyamaaya ettavum kuranja asimat konum randaamathe moolyam saadhyamaaya ettavum uyarnna asimat konum aanu. thannirikkunna eee asimat konukalkkullil maathrame prograam viewshed vishakalanam cheiyukayulloo. 
oru lamba konum cherkkaam. lamba koninulla moolyangal 90° (nere mukalilekku nokkunnathu) muthal-90° (nere thaazhekku nokkunnathu) vareyaanu. radio tower valare idungiya lambamaya beam purappeduvikkunna sandarbhangalil eee variable cherkkendathundu.
viewshed vishakalanathil upayogikkunna anthima variable radius moolyamaanu. radio gopuratthinte kaaryatthil, radio signalinu parimithamaaya paridhi undengil, orupakshe 10 mile, appol viewshed vishakalanam 10 mile radiusaayi parimithappedutthaan radius variable sajjamakkaam.
viewshed vishakalanam upayogikkunnu.
gopuram sthaapikkunnathinu purame mattu prayogangalkkaayi oru viewshed vishakalanam upayogikkaam. udaaharanathinu, oru viewshed vishakalanathin oru valia kettidam koottichertthathinte aaghaatham kanakkakkaan kazhiyum. viewshed vishakalanam kettidam kaanaan kazhiyunna ellah mekhalakalum eathenkilum prathyeka sthalathu ninnu avyakthamaaya eathenkilum kaazhchakalum kanikkum. parvathapradeshangalile agni nireekshana kendrangal kandethunnathinum viewshed vishakalanangal upayogikkunnu (liie aandu stakki, 1998). ithu steshanukal sthaapikkaan anuvadikkunnu, angane muzhuvan vanavum theepiduthatthinu saadhyathayullathayi nireekshikkaan kazhiyum.
oru line segmentile viewshed vishakalanam upayogikkunnathinte oru udaaharanam beuro oof land maanejmentile vyoming stettu offeesil ninnullathaanu, athil vyomingiludaneelamulla deseeya charitraparamaaya pathakalil ninnulla drishyaparatha nirnnayikkaan oafees oru viewshed vishakalanam upayogichu. roock springs feeld oafees eriyayil thiranjedukkaan anchu vyathyastha viewshedukalundu. ivide udaaharanam viewshed nambar vann aanu. pathayil ninnu ethra thavana kaanaan kazhiyumennathinte adisthaanathil, naalu vyathyastha thalangalil pathakalil ninnu drishyamaakaathathum drishyamaakunnathumaaya bhoopradeshangale viewshed soochippikkunnu. padinjaaran athirthiyile (roock springs feeld oafees) paathakaliloode sanjarikkumbol pioneermark kaanaan kazhiyunnathaayirunnu ithu.
savisheshamaaya oru veekshana vishakalanam.
mattoru udaaharanathil, american aikyanaadukalile bhoomishaasthra sarway (yuu. ezz. jii. ezz) naasayude maars exploration rover (merr) padhathiye sahayikkaan oru viewshed vishakalanam upayogichu. chovva roverukalkku anuyojyamaaya landing spottukal kandethendivannappol, saadhyamaaya ettavum mikacha sittukal mapp cheyyaan naasa usgkalilekku thirinju. vishakalanathinte oru bhaagath saadhyamaaya saitt thiranjeduppukalude oru viewshed ulppedunnu. eee saahacharyathil oro landing saittilum ninnu chovva roverukalkku drishyamaakukayo drishyamaakaathirikkukayo cheiyunna pradeshangale viewshed soochippikkunnu (merr landing saitt viewshed vishakalanam).

