Lýsigagnagátt
Loftmyndir DMA 1956-1961 / Aerial photographs DMA 1956-1961
[IS]
Loftmyndir, sem bandaríski herinn tók á árunum 1956-1961, eru svokallaðar DMA myndir (Defense Mapping Agency). Afrit af filmum DMA myndanna er að finna í loftmyndasafni Náttúrufræðistofnunar (áður Landmælinga Íslands). Árið 2024 voru filmurnar skannaðar af fyrirtækinu Wehrli & Co (í Bandaríkjunum) með 20 míkróna punktstærð og 8-bita dýpt.
Staðsetning myndanna var unnin út frá níu kortum í mælikvarðanum 1:250.000. Fluglínur voru upphaflega handteiknaðar á kortin, kortin voru hnitsett og seinna var fluglínunum settar á vektorform, þar sem fyrstu og síðustu myndanúmer hverrar fluglínu voru skráð sem eigindir.
Í kjölfariðið var gagnagrunnurinn endurskoðaður með því að rýna skönnuðu myndirnar. Auka upplýsingum var bætt við eigindatöfluna, svo sem dagsetningar ljósmyndanna, brennivídd og flughæð. Fluglínurnar voru einnig flokkaðar eftir staðsetningu og nálægum dagsetningum í eigindinni „svæði“. Hverri fluglínu var umbreytt í punkta, þar sem gert var ráð fyrir að punktarnir væru miðja fyrstu og síðustu mynda fluglínunnar. Staðsetning miðju allra hinna myndanna meðfram viðkomandi fluglínu var línulega áætluð, miðað við að allar myndirnar væru teknar með reglulegu millibili.
Áætluð nákvæmni staðsetningar er ± 2 km.
Heimild:
Náttúrufræðistofnun. Loftmyndir DMA1956 - 1961. Dagsetning myndar. loftmyndasja.gis.is. [Loftmynd].
[EN]
The aerial photographs collected by the US military in 1956-1961 are the so-called Defense Mapping Agency
(DMA) images. A copy of the films of the DMA images is available at the archive of aerial photographs of the
National Land Survey of Iceland. In 2024, these films were scanned by the company Wehrli & co (in US), at a
scanning resolution of 20 microns and 8-bits.
The location of these images was extracted by a series of nine maps in 1:250.000 which had hand-drawn the
flightlines relative to these images. These maps were georeferenced and the flightlines were digitized into
vectors, writing the first and last image numbers of each flightline as attributes.
Once this was finished, a revision of the database was made, by inspecting the scanned images. Extra
information was added into the table, such as the date of the photographs, the focal length and flight height. The
flightlines were also grouped by location and nearby dates, into the attribute "area". Finally, each flightine was
converted into points, assuming these points to be the first and last center of the images of the flightline. The
location of the center of all the remaining images along a flightline were linearly interpolated, assuming that all
the images were taken at regular intervals.
The expected accuracy of the geolocation is ± 2 km.
Citation:
Natural Science Institute of Iceland [Náttúrufræðistofnun]. Aerial photographs DMA 1956 - 1961 [Loftmyndir DMA 1956-1961]. Imagery date. loftmyndasja.gis.is. [Aerial Imagery].
Simple
- Date (Creation)
- 2024-06-05
- Credit
-
Citation and Credits: "Aerial imagery from Náttúrufræðistofnun (áður Landmælinga Íslands)"
- Status
- Completed
- Point of contact
-
Organisation name Individual name Electronic mail address Role Náttúrufræðistofnun
Joaquin Munoz Cobo Belart
Point of contact
- Maintenance and update frequency
- Not planned
- Theme
-
- Place
-
-
Loftmyndir
-
Aerial photographs
-
Orthoimagery
-
- Access constraints
- Copyright
- Use constraints
- otherRestictions
- Other constraints
-
https://creativecommons.org/licenses/by/4.0/
Citation and Credits: "Aerial imagery from Náttúrufræðistofnun"
- Spatial representation type
- Grid
- Denominator
- 125000
- Language
-
eng
- Character set
- UTF8
- Topic category
-
- Imagery base maps earth cover
- Begin date
- 1956-01-01
- End date
- 1961-12-31
))
- Reference system identifier
- EPSG:8088
- Number of dimensions
- 3
- Dimension name
- Row
- Dimension name
- Column
- Dimension name
- Vertical
- Cell geometry
- Area
Digital transfer options
- OnLine resource
-
Protocol Linkage Name WWW:LINK-1.0-http--link
https://www.lmi.is/ Náttúrufræðistofnun, heimasíða - webside
WWW:LINK-1.0-http--link
https://loftmyndasja.lmi.is/mapview/?application=loftmyndasja Loftmyndasjá - Imagery viewer
OGC:WMS-1.3.0-http-get-capabilities
https://gis.lmi.is/geoserver/loftmyndir/wms?service=WMS&request=GetCapabilities dma_myndir_1956_1961
OGC:WFS-1.0.0-http-get-capabilities
https://gis.lmi.is/geoserver/loftmyndir/wfs?service=WFS&request=GetCapabilities dma_myndir_1956_1961
- Hierarchy level
- Dataset
Metadata
- File identifier
- 37acc9c9-e2ff-412d-9923-76a001035ca7 XML
- Metadata language
- ice, eng
- Character set
- UTF8
- Date stamp
- 2026-01-16T09:59:29
- Metadata standard name
-
ISO 19115:2003/19139
- Metadata standard version
-
1.0
- Metadata author
-
Organisation name Individual name Electronic mail address Role Náttúrufræðistofnun
Point of contact
)))