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From 1 - 10 / 487
  • Categories  

    Bauganet jarðar byggist á ímynduðu hnitakerfi sem lagt er yfir jarðarkúluna og er notað til að gefa upp nákvæma staðsetningu á yfirborði jarðar. Breiddarbaugar eru notaðir til þess að ákvarða staðsetningu til norðurs eða suðurs og lengdarbaugar ákvarða staðsetningu til austurs eða vesturs. Hver gráða á lengdarbaug er að meðaltali 111,2 kílómetrar á lengd (um það bil 60 sjómílur) svo til að fá meiri nákvæmni er henni ýmist skipt í hundraðshluta (kommustafi) eða mínútur (60 hluta) og sekúndur (60*60 eða 360 hluta). Dæmi um hnit í bauganeti jarðar er 48°51′29″N, 2°17′40″A (Eiffelturninn í París) þar sem ' eru mínútur og " sekúndur.

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    Skoðunarþjónustur í samræmi við INSPIRE tilskipunina og lög um grunngerð fyrir stafrænar landupplýsingar

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    IS: Í Kortasjá Náttúrufræðistofnunar er meðal annars hægt að velja kort með örnefnum, loftmyndir, atlaskort eða AMS kort. Þá er þar að finna sveitarfélagakort með upplýsingum um stærð sveitarfélaga og íbúarfjölda, þekju með CORINE landflokkun sem sýnir til dæmis mólendi eða mýrlendi og gamlar ljósmyndir danskra landmælingamanna sem og gamlar bæjarteikningar. EN: Kortasjá from Institute of Nature Research is a simple and reactive map where the user can view placenames, protected areas, Corine classification, roads, height points, buildings, boundaries of municipalities, and more.

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    The Urban Atlas provides pan-European comparable land use and land cover data for Functional Urban Areas (FUA). The Street Tree Layer (STL) is a separate layer from the Urban Atlas 2012 LU/LC layer produced within the level 1 urban mask for each FUA. It includes contiguous rows or a patches of trees covering 500 m² or more and with a minimum width of 10 meter over "Artificial surfaces" (nomenclature class 1) inside FUA (i.e. rows of trees along the road network outside urban areas or forest adjacent to urban areas should not be included). Urban Atlas is a joint initiative of the European Commission Directorate-General for Regional and Urban Policy and the Directorate-General for Enterprise and Industry in the frame of the EU Copernicus programme, with the support of the European Space Agency and the European Environment Agency.

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    Vefþjónn fyrir landfræðileg gögn Náttúrufræðistofnun. Hér eru nýjustu útgáfur gagna Náttúrufræðistofnun aðgengilegar. Vefþjónnin er byggður á opnum staðli OGC og hægt er að nálgast gögnin á vefþjóninum í gegnum ýmsar tegundir þjónusta, s.s. WFS, WMS, WMTS.

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    Skoðunarþjónustur Náttúrufræðistofnunar (Jarðfræði, líffræði, náttúruvernd)

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    The high resolution imperviousness products capture the percentage and change of soil sealing. Built-up areas are characterized by the substitution of the original (semi-) natural land cover or water surface with an artificial, often impervious cover. These artificial surfaces are usually maintained over long periods of time. A series of high resolution imperviousness datasets (for the 2006, 2009, 2012 and 2015 reference years) with all artificially sealed areas was produced using automatic derivation based on calibrated Normalized Difference Vegetation Index (NDVI). This series of imperviousness layers constitutes the main status layers. They are per-pixel estimates of impermeable cover of soil (soil sealing) and are mapped as the degree of imperviousness (0-100%). Imperviousness change layers were produced as a difference between the reference years (2006-2009, 2009-2012, 2012-2015 and additionally 2006-2012, to fully match the CORINE Land Cover production cycle) and are presented 1) as degree of imperviousness change (-100% -- +100%), in 20m and 100m pixel size, and 2) a classified (categorical) 20m change product. The production of the High Resolution Imperviousness products was coordinated by the European Environment Agency in the frame of the EU Copernicus programme. A verification of the Imperviousness layer was performed by the Institute of Nature Research during autumn of 2018 and the data and resulting report are made available on the NLSI websites.

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    Útlínur dregnar eftir uppréttum Sentinel-2 gervihnattamyndum. Uppréttar loftmyndir frá Loftmyndum ehf. og Landsat 8 gervihnattamyndir voru einnig notaðar á nokkrum stöðum.

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    Slope aspect map of Iceland. This tool calculates slope aspect (i.e. slope orientation in degrees clockwise from north) for each grid cell in an input digital elevation model (DEM). “Aspect values indicate the directions the physical slopes face.” The values of each cell in the output raster indicate the compass direction the surface faces at that location. It is measured clockwise in degrees from 0 (due north) to 360 (again due north), coming full circle. Flat areas having no downslope direction are given a value of -1.

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    Slope map of Iceland (in Degrees and Percent units). The slope gradient (slope, slope steepness) identifies the steepest downhill slope for a location in a surface: “the inclination of the land surface with respect to the horizontal plane” Basic local land-surface parameters. First partial derivative from surface.