Mælikvarðaskekkja (ppm = milljónarhlutur)

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Provided by National Land Survey of Iceland

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Dataset information

Catalog

Icelandic geoportal

Country of origin

Iceland

Updated

Created

2021.06.09

Available languages

Icelandic

Keywords

Open data, Raster gögn LMÍ, Opin gögn LMÍ, GSL, Iceland

Datasource

Official portal for European data link

Quality scoring

210

Dataset description

Þessi þekja sýnir mælikvaðaskekkjur (Scale) fyrir Lambert Conformal Conic (2SP) kortavörpunina sem oftast er notuð fyrir ISN hnitakerfin, stundum nefnd ISNET vörpun. ISN93 EPSG:3057, ISN2004 EPSG:5325 og ISN2016 EPSG:8088. Þegar mælikvarðinn er jákvæður þýðir það að raunveruleg lengd er styttri en lengd reiknuð með kortahnitum og öfugt ef kvarðinn er neikvæður. 1 ppm jafngildi 1mm á kílómeter. Til þess að fá góða nálgun á raunverulegri lengd á sporvölu GRS80 er kortalengd með mælikvarðanum. Sem dæmi ef mælikvarðinn er 300 ppm þýðir það að 1000,30m í kortahnitum er í raun 1000m.

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