Stefnuskekkja

Open data API in a single place

Provided by National Land Survey of Iceland

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Dataset information

Country of origin
Updated
Created
2021.06.09
Available languages
Icelandic
Keywords
Iceland, Opin gögn LMÍ, Open data, GSL, Raster gögn LMÍ
Quality scoring
210

Dataset description

Þessi þekja sýnir stefnuskekkjur (Meridian Convergence) fyrir Lambert Conformal Conic kortavörpunina sem oftast er notuð fyrir ISN hnitakerfin, stundum kölluð ISNET vörpun. ISN93 EPSG:3057, ISN2004 EPSG:5325 og ISN2016 EPSG:8088. Stefnuskekkjan segir okkur hvernig norðurstefna á korti víkur frá raunverulegri norðurstefnu á sporvölu GRS80. Þetta veldur því að fyrirbæri virðast norðar en þau í raun og veru eru út frá lengdarási vörpunarinnar sem er 19°vestur í okkar tilfelli. Því lengra sem við fjarlægjumst ásinn þeim mun meir bjögun fáum við. Sem dæmi er norðurhnit Hraunhafnatanga um 270m hærra en norðurhnit Rifstanga í ISNET vörpun, en í raun er Rifstangi um 65m norðar þegar hnattstað hans er skoðuð í baughnitum á sporvölu GRS80. Hraunhafnatangi er um 7,4km austar en Rifstangi.
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