Fig 1.
A supposed distribution route of Ongagawa pottery and the sites with samples used in the present study.
1. Itazuke (板付), 2. Tsuko-tsuchitori (津古土取), 3. Ayaragi-go (綾羅木郷), 4. Yano (矢野), 5. Uemitani-shinoda (上三谷篠田), 6. Dougomachi (道後町), 7. Tamura (田村), 8. Kamei (亀井), 9. Kinomoto (木の本), 10. Tainaka (田井中). This map contains data provided by Geospatial Information Authority of Japan (GSI: https://maps.gsi.go.jp/development/ichiran.html) as a part of The GSI Tiles Collection, the Elevation Map by Color. Especially, the sea area is based on the reports by Hydrographic and Oceanographic Department. Location information, scale, direction mark and some figures were added by TN with QGIS 3.16.11version. Reprinted from https://maps.gsi.go.jp/development/ichiran.html under a CC BY license, with permission from Geospatial Information Authority of Japan, original copyright 2013.
Fig 2.
Placement for SfM/MVS construction of 3D models in FOLDIO 3.
This pottery is from the Dougomachi site, owned by The Ehime Research Center for Buried Cultural Properties.
Fig 3.
Sample photos from different angles for SfM/MVS.
The number of angles (three or four) when we take photos of the inside of pottery depends on its form. It also depends on the outside form whether we tilt the camera at an angle of 15 to 20 degrees or take photos from front.
Fig 4.
Placement for scanning with the Creafrom HandySCAN BLACK or Creafrom HandySCAN BLACK™ | Elite (the pottery is tainaka_26_254 and ayaragi-go_407).
The scanner reconstructs 3D models of the pottery based on the time and angle of the reflected laser from the target points (silver and black seals on the acrylic boards).
Fig 5.
Comparisons of the distances in the 3D models by Creafrom HandySCAN BLACK™ | Elite and the actual objects using a steel ruler.
Table 1.
Summarized data of comparisons.
Pottery from the Ayaragi go site is owned by the Shimonoseki city archaeological museum, the Tamura site by the Kochi Prefecture Archaeological Center, the Itazuke site by the Fukuoka City Archaeological Center, the Kamei site by the Osaka Center for Cultural Heritage, the Kinomoto and Tainaka site by the Osaka Prefectural Board of Education, the Yano site by the Izumo Yayoinomori Museum, the Uemitani and Dougomachi site by the Ehime Prefecture Archaeological Center, the Tsuko-tsuchitori site by the Ogori City Archaeological Center, and the Shimokawatsu site by the Kagawa Prefecture Archaeological Center.
Fig 6.
The difference between 3D models by two kinds of laser scanners (ayaragi-go_293 and tamura_c1_12_7), laser scanner (1) and SfM (1) (tamura_b1_4_8 and yano_256_3), laser scanner (1) and SfM (2) (tsuko_89_2), and laser scanner (1) and SfM (3) (tamura_c1_34_12) using GOM Inspect.
Fig 7.
Photos aligned in Metashape.