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Fleiri upplýsingar má nálgast hér: 
TRI Paper: https://arc.lib.montana.edu/ojs/index.php/IJS/article/view/2914
GDAL TRI: https://gdal.org/en/stable/programs/gdal_raster_tri.html

[EN] Terrain Ruggedness Index (TRI) describes local terrain variation and ruggedness by measuring the elevation difference between a raster cell and its surrounding cells. It was calculated from the 10 m ÍslandsDEM using GDAL raster tri. Low values, close to 0, indicate smooth or relatively uniform terrain. Higher values indicate greater elevation differences and more rugged terrain, such as steep slopes, mountainous areas, gullies, or other areas with strong local relief. TRI can be used to support landscape analysis, landform classification, assessment of terrain variability, and interpretation of geological or hydrological landscape characteristics.

More info: 
TRI Paper: https://arc.lib.montana.edu/ojs/index.php/IJS/article/view/2914
GDAL TRI: https://gdal.org/en/stable/programs/gdal_raster_tri.html</gco:CharacterString>
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[EN] The purpose of the TRI dataset is to describe local terrain ruggedness by identifying how much elevation difference exists between each location and its immediate surroundings. It can be used for landscape analysis, landform classification, geomorphological interpretation, hydrological assessment, and mapping areas with different levels of terrain variability, ranging from smooth terrain to steep or mountainous areas.</gco:CharacterString>
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                  <gco:CharacterString>[IS] Gögnin fyrir hrjúfleikavísir landslags eða TRI eins og þau eru kölluð í daglegu tali voru unnin út frá ÍslandsDEM í 10 m upplausn. Hæðarlíkanið (rasterlíkan) var unnið með GDAL raster tri, sem reiknar TRI-gildi fyrir hvern reit út frá hæðarmun milli miðjureits og nærliggjandi reita. Útkoman eru einrása rastergögn (single-band raster) sem sýnir staðbundinn hrjúfleika landslags og breytileika í hæð miðað við næsta umhverfi. Lág gildi, nálægt 0, gefa til kynna slétt eða lítið breytilegt landslag, en hærri gildi gefa til kynna meiri hæðarmun og hrjúfara landslag. NoData-gildi eru skráð sem -9999.

[EN] The Terrain Ruggedness Index (TRI) dataset was derived from the 10 m resolution ÍslandsDEM. The elevation raster was processed using GDAL raster tri, which calculates TRI values for each cell from the elevation differences between the central pixel and its surrounding cells. The output is a single-band raster representing local terrain ruggedness and elevation variation relative to the immediate surroundings. Low values, close to 0, indicate smooth or relatively uniform terrain, while higher values indicate greater elevation differences and more rugged terrain. NoData values are represented as -9999.</gco:CharacterString>
               </gmd:statement>
               <gmd:source uuidref="e6712430-a63c-4ae5-9158-c89d16da6361"/>
            </gmd:LI_Lineage>
         </gmd:lineage>
      </gmd:DQ_DataQuality>
  </gmd:dataQualityInfo>
</gmd:MD_Metadata>