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Um er að ræða rastergögn sem sýna árlegar mögulegar uppsafnaðar sólarstundir út frá landslagi á Íslandi yfir heilt ár og eru gögnin unnin úr IslandsDEM, 10 m hæðarlíkaninu  í EPSG:8088. Rastergögnin byggja á hermun á landslagskuggum, þar sem útreikningar voru gerðir fyrir hvern klukkutíma á tímabilinu 1. janúar til 31. desember 2027 með tímabeltinu Atlantic/Reykjavik miðað við að dagsbirta sé til staðar þegar sólin er allt að 6 gráður undir sjóndeildarhring. Gildi pixla gefa til kynna fjölda hermdra tímapunkta þar sem viðkomandi staður var skilgreindur sem sólríkur; hærri gildi tákna því tíðara sólskin yfir árið. Skýjahula og aðrir þættir en landslag eru ekki teknir með í útreikningana.

[EN]
Annual theoretical maximum cumulative sunlight raster for Iceland based on terrain and topological features, generated from the IslandsDEM 10 m DEM in EPSG:8088. The raster summarizes hourly terrain-shadow simulations from 1 January to 31 December 2027, using the Atlantic/Reykjavik timezone and a civil twilight threshold of 6 degrees below the horizon. Pixel values indicate the number of simulated time steps in which each location was classified as sunlit; higher values represent more frequent sunlight occurrence during the year. Clouds and other factors beside terrain are not taken into account.</gco:CharacterString>
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Gögnin eru ætluð til greiningar og myndrænnar framsetningar á árlegu mynstri landslagskugga og sólarlýsingar, áhrifum landslags á skuggamyndun og staðbundnum mun á mögulegu aðgengi að sólarljósi á Íslandi.

[EN]
This dataset is intended for analysis and visualization of annual terrain-shadow and sunlight-exposure patterns, topographic shading effects, and spatial differences in potential sunlight availability across Iceland.</gco:CharacterString>
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Rastergögnin sýna uppsafnaða tíðni sólskins miðað við landslag á Íslandi árið 2027. Það var unnið út frá stafrænu 10 m hæðarlíkani IslandsDEM í EPSG:8088 og byggir á klukkustundarlegum hermunum á landslagskuggum fyrir tímabilið 1. janúar 2027 til 31. desember 2027.

Fyrir hvern klukkutíma var reiknuð staða sólar miðað við staðsetningu hæðarlíkansins og tímabeltið Atlantic/Reykjavik. Tímaáætlunin tekur til þeirra tímapunkta þar sem sólarhæðin er innan skilgreindra marka rökkurs eða hærri, með viðmiðunarmörkum sem miðast við að sólin sé allt að 6 gráður undir sjóndeildarhring. Með þessu er tekið tillit til birtuskilyrða á norðlægum slóðum á Íslandi, þar á meðal mjög langra sumardaga og tímabila þar sem rökkur nær yfir miðnætti.

Uppsafnaða rasterið sýnir hversu oft hver pixill var skilgreindur sem sólríkur í öllum þeim tímapunktum sem hermunin náði til. Hærri gildi gefa til kynna staði sem voru oftar í sól á því tímabili sem var hermt, en lægri gildi gefa til kynna staði sem voru oftar í landslagskugga. NoData-svæði gefa til kynna að hæðargildi vanti eða séu ógild í upprunalega hæðarlíkaninu.


[EN] 
This raster represents cumulative terrain sunlight frequency for Iceland during the year 2027. It was generated from the IslandsDEM 10 m digital elevation model in EPSG:8088 and summarizes hourly terrain-shadow simulations for the period from 1 January 2027 to 31 December 2027.

Each hourly raster was calculated using the position of the sun for the DEM location and the Atlantic/Reykjavik timezone. The schedule includes times when the solar elevation was within civil twilight or higher, using a twilight depression threshold of 6 degrees. This allows the dataset to account for high-latitude lighting conditions in Iceland, including very long summer days and periods where twilight extends across midnight.

The cumulative raster records how often each pixel was classified as sunlit across all generated time steps. Higher values indicate locations that were sunlit more frequently during the modeled period, while lower values indicate locations that were more often in terrain shadow. Areas marked as nodata correspond to invalid or missing elevation values in the source DEM.</gco:CharacterString>
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