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What Metadata is Stored
Learn what metadata is held by default in content entries and is available for you to query.
Aside from metadata you add to each individual content entry, you are also able to query for metadata automatically generated by the platform for each individual content entry.
Different hologram types and target types can determine the automatically generated metadata available.

Any Content Entry

This metadata key are available for any content entry regardless of the hologram type or target type.
Key
Type
Description
Value Example
createdAt
Number
Timestamp in UTC format of the time the content was created
1587258208433
lastAccessed
Number
Timestamp in UTC format of the last time the content was accessed
1587248667634
accessHistory
Array
A collection of timestamps in UTC format of the times the content was accessed
[\"1587253222904\"]
usageByDate
Object
A collection of dates in human readable format in which the content was used and a counter of the overall time it was used.
[{\"date\":\"2020-04-18\",\"numUses\":12.0}]
qrWebXRStorageFilename
String
Filename of a QR image redirecting to a sample WebXR experience that shows this hologram
qr_webxr_my_key_1234.png
qrWebXRStorageID
String
Storage ID of a QR image redirecting to a sample WebXR experience that uses this hologram
9d39d3f4-68f5-49ae-a798-903ac249f073
qrARjsStorageFilename
String
Filename of a QR image redirecting to a sample AR.js experience that shows this hologram
qr_arjs_my_key_1234.png
qrARjsStorageID
String
Storage ID of a QR image redirecting to a sample AR.js experience that shows this hologram
fd3f4c85-5d47-40ea-a38c-9aeb728f780b
qrARjsTargetStorageFilename
String
Filename of the target file used for a sample AR.js experience that shows this hologram
qr_arjs_my_key_1234.patt
qrARjsTargetStorageID
String
Storage ID of the target file used for a sample AR.js experience that shows this hologram
ce090285-8b88-4b12-b9d3-da6490298da2
qrARjsMarkerStorageFilename
String
Filename of the image marker file used for a sample AR.js experience that shows this hologram
marker_qr_arjs_my_key_1234.png
qrARjsMarkerStorageID
String
Storage ID of a QR image redirecting to a sample AR.js experience that uses this hologram and doubles as a marker
bb9e8709-a882-49fe-a3d1-9804fa452ba4
source
String
Credit attribution to the creator of the hologram
Skyscraper by Poly by Google, CC-BY

Specific Hologram Types

These metadata keys are available for content entries with specific hologram types.

Model Holograms

Key
Type
Description
Value Example
glbHologramStorageFilename
String
Filename of a .glb version of the 3D model, if such exists
Skyscraper.glb
glbHologramStorageID
String
Storage ID of a .glb version of the 3D model, if such exists.
d686a655-e800-430d-bfd2-e38cdfb0c9e9.glb
usdzHologramStorageFilename
String
Filename of a .usdz version of the 3D model, if such exists
Skyscraper.usdz
usdzHologramStorageID
String
Storage ID of a .usdz version of the 3D model, if such exists.
d686a655-e800-430d-bfd2-e38cdfb0c9e9.usdz
vuforiaHologramStorageFilename
String
Filename of a .h version of the 3D model, if such exists
Skyscraper.h
vuforiaHologramStorageID
String
Storage ID of a .h version of the 3D model, if such exists.
7068cd74-6c9f-4106-9326-585c56fa4475
shortURL
String
A short shareable URL which automatically redirects to the model
https://go.echo3d.co/24m3

Video Holograms

Key
Type
Description
Value Example
height
Number
Height of the video frame
360
width
Number
Width of the video frame
460

Image Holograms

Key
Type
Description
Value Example
height
Number
Height of the video frame
360
width
Number
Width of the video frame
460
compressedImageStorageID
String
Storage ID of the compressed version of the image uploaded by the user, if such exists.
d2c42d32-dd13-4541-b446-89dcf8e4bcb4

Specific Target Types

These metadata keys are available for content entries with specific target types.

Surface Targets

No additional metadata for surface targets.

Location Targets

No additional metadata for location targets.

Image Targets

Key
Type
Description
Value Example
originalImageStorageID
String
Storage ID of the original image uploaded by the user before being compressed, if such exists.
d2c42d32-dd13-4541-b446-89dcf8e4bcb4
arjsTargetStorageFilename
String
Filename of the target file used for a sample AR.js experience that shows this hologram
air.patt
arjsTargetStorageID
String
Storage name of the target file used for a sample AR.js experience that shows this hologram
f6607f7b-aee2-4cc8-87e1-97be5a6c36a6
arcoreTargetStorageFilename
String
Filename of the target file used for a sample AR.js experience that shows this hologram
air.imgdb
arcoreTargetStorageID
String
Storage ID of the target file used for a sample AR.js experience that shows this hologram
420c746a-34e3-4535-b9ba-a4c14b4cc881
arjsMarkerStorageFilename
String
Filename of the image marker file used for a sample AR.js experience that shows this hologram
marker_air.png
arjsMarkerStorageID
String
Storage ID of the image marker file used for a sample AR.js experience that shows this hologram
440c117a-5b11-4380-8d1d-6d54d3889c08
vuforiaTargetID
String
Target ID of the image used by Vuforia Cloud Recognition
6309204a74d842a8b 6917e6aef743088
Last modified 17d ago