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            <gco:CharacterString>Mósaík af Hexagon KH9-PC myndum frá 22. ágúst 1980 - fyrstu niðurstöður.

Um er að ræða fyrstu útgáfu af myndum sem teknar voru 22. ágúst 1980 af Hexagon KH9 könnunargervihnettinum. Myndirnar voru teknar með panorama myndavél (PC) sem náði að taka myndir af um 75% af Íslandi á einum degi með staðbundinni upplausn á bilinu 0,7 til 1,4 metrar.

Opnað var á gögnin árið 2013 og er hægt að hlaða þeim niður frá Jarðfræðistofnun Bandaríkjanna (USGS: https://earthexplorer.usgs.gov/). Filmurnar voru skannaðar af USGS í 7 míkron upplausn árið 2023.

Geometría skynjarans er ekki þekkt og myndirnar eru mjög bjagaðar. Vegna þessa er vinnsla þessara gagna tilraunakennd. Ames StereoPipeline v3.3 (https://zenodo.org/record/8270270) var notuð til að vinna Hexagon KH9 myndirnar.

Í fyrstu niðurstöðum eru verulegar staðsetningarvillur og því þarf að nota þessi gögn með fyrirvara. Sem dæmi má nefna að það er u.þ.b. 2 km tilfærsla á höfuðborgarsvæðinu til austurs. Almennt séð er staðsetningin betri (rýmisnákvæmni upp á tugi metra) í miðhluta myndanna en brenglun er meiri á austur- og vesturhlið myndanna.

Vinsamlega hafið samband við Náttúrufræðistofnun til að fá nánari upplýsingar.

---- 

This mosaic is the first version of the processing of a set of images acquired on the 22nd August 1980 from the reconnaissance satellite Hexagon KH9, and specifically, from its panoramic camera (PC), which acquired about 75% of Iceland in one day, with a spatial resolution between 0.7 and 1.4 meters.

The data was declassified in 2013 and is available for download through the United States Geological Survey (USGS: https://earthexplorer.usgs.gov/). The films were scanned by the USGS at 7 micron resolution in 2023.

The geometry of the sensor is not known, and the images contain large distortions, therefore the processing of these data is highly experimental. We used the Ames StereoPipeline v3.3 (https://zenodo.org/record/8270270), with the suggested workflow for processing Hexagon KH9 images.

The first results have significant positional errors and therefore these data needs to be used with special caution. For example Reykjavík greater area has a ~2 km shift to the east. In general, the location is better (spatial accuracy of tens of meters) in the middle part of the images, and distortions are larger on the East and West sides of the images.</gco:CharacterString>
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