DOI: 10.5878/6m3n-1124
title: CHAQ2020 - Snow Hill Island - Spatial data
title: CHAQ2020 - Snow Hillön - Spatiala data

description: The first Swedish Antarctic Expedition (1901-1903), led by Otto Nordenskjöld, sailed to Antarctica on the ship Antarctic captained by CA Larsen, and established a research station on Snow Hill Island. There six members overwintered and performed paleontological, meteorological, geomagnetic and geological studies, while the rest of the expedition set sail for South Orkney.

After the winter, on the way back to Snow Hill Island, the Antarctic got stuck in the ice and sank. At this point, the expedition members were divided into three groups. One of these overwintered an extra year on Snow Hill Island, whereas the other two groups were forced to build stone huts in order to overwinter at Hope Bay and Paulet Island. An Argentinean vessel, the Corbeta Uruguay, rescued the expedition in November 1903.

CHAQ 2020 is an Argentinean-Swedish project with fieldwork in the area around the Antarctic Peninsula aiming to investigating and documenting the historical remains of the first Swedish South Polar expedition under the leadership of Otto Nordenskjöld 1901-1903. The material was collected in January and February 2020. 

This catalogue entry collects the spatial data from Snow Hill Island, which include point clouds and textured meshes produced through laser scanning with a Faro Focus m70, and structure-from-motion photography.

The scanning of the interiors of the winter station took place on the 12th and 13th of January 2020. In total, point clouds from 31 different positions were collected, ranging between 150 and 500 million points per scan. In addition to all the raw files, seven key positions have been processed and are available in full resolution through the repository and as previews below. The interior scans have also been registrered and combined into two point clouds, one for the ground floor and one for the attic. The ground floor point cloud is 2.6 billion points and the attic point cloud consists of 354 million points. These dense clouds can be donwloaded from the repository, and sparse representations of these are available below. The winter station exteriors, as well as the hill it stands on, have been captured through 54 scanning positions at four different occasions between January 13 and 19, 2020. These are available both as individual raw scans through the repository and as two pointclouds combining several of the scans. The first one collects 34 exterior scans in greyscale of the station and hill (2.3 billion points) from January 13 and 14, while the second one in colour collects the 19 scans done on the January 18 and 19 of the winter station exteriors. Sparse versions of these point clouds are available below. 

In addition to laser scanning, several models were produced through Structure-from-Motion photogrammetry, using both handheld cameras (Fujufilm X-T2 and iPhone XR) and drone (DJI Mavic 2 Pro and DJI Phantom 4). The exterior ground-based models of the hut and the hill were computed using 6657 photos captured with the Fujufilm X-T2, and a model of the landscape was created through 1428 photos captured with the drone.
description: Syftet med forskningsprojektet var att dokumentera lämningarna efter Otto Nordenskjölds Antarktisexpeditionen 1901-1903. Materialet består av fotografier, planer, ritningar, 3d-modeller och drönarfilmer från Snow Hillön, Hoppets vik och Seymourön.

Denna katalogpost samlar den spatiala datan från Snow Hillön, vilket inkluderar punkmoln och texturerade trådmodeller skapade med en Faro Focus m70 laserskanner samt structure-from-motion fotografering.

Se den engelska beskrivningen för mer information.

Skanningen av vinterstationens interiörer ägde rum den 12 och 13 januari 2020. Totalt samlades punktmoln från 31 olika positioner, med mellan 150 och 500 miljoner punkter per skanning. Interiörskanningarna har också registrerats och kombinerats till två punktmoln, en för bottenvåningen och en för vinden. Bottenvåningens punktmoln är 2,6 miljarder punkter och punktsmolnet från vinden består av 354 miljoner punkter. Vinterstationens exteriör, liksom kullen den står på, har fångats med 54 skanningspositioner vid fyra olika tillfällen mellan 13 och 19 januari 2020. Dessa finns både som enskilda rådata och som två punktmoln vilka kombinerar flera av skanningarna. Den första samlar 34 yttre skanningar i gråskala av stationen och kullen (2,3 miljarder punkter) från 13 och 14 januari, medan den andra i färg samlar de 19 skanningar som gjordes den 18 och 19 januari av vinterstationens exteriörer. 

Förutom laserskanning producerades flera modeller genom Structure-from-Motion-fotogrammetri med både handkameror (Fujufilm X-T2 och iPhone XR) och drönare (DJI Mavic 2 Pro och DJI Phantom 4). De yttre markbaserade modellerna för stationen och kullen beräknades med 6657 foton som tagits med en Fujufilm X-T2, och en modell av landskapet var skapad genom ytterligare 2689 fotografier som tagits med drönare.