Geoscience Reference
In-Depth Information
Table 1
The metadata noticed among the eight inventoried resources are labeled by “E” for
noticed in explicit fields, “I” for noticed in implicit fields (e.g. written summaries), and “Ø” for
not noticed at all
Information
category
Information
details
CGDI
QCOD
LID
MRN
CBW
TRL
CTY1
CTY2
3D spatial
Primitive
dimension
I
Ø
I
I
I
I
I
I
Primitive type
I
Ø
E
I
E
E
E
I
Elevation
encoding
E
Ø
Ø
Ø
I
Ø
Ø
Ø
3D pre-
processing
E
Ø
I
I
I
I
I
I
Vertical precision
E
Ø
E
I
I
Ø
E
E
Vertical coverage
E
Ø
Ø
Ø
I
I
I
I
Vertical spatial
reference
E
Ø
Ø
Ø
I
Ø
Ø
Ø
LoD
Object count
Ø
Ø
Ø
Ø
E
Ø
E
E
Primitive count
Ø
Ø
Ø
Ø
E
E
I
Ø
Scale
E
Ø
Ø
Ø
Ø
Ø
Ø
Ø
3D appearance
Texture and
material
Ø
Ø
Ø
Ø
E
I
I
I
3D format
Proprietary
formats
E
E
Ø
E
E
E
E
I
In header row, the abbreviations (e.g. CGDI) represent the inventoried resources. For full names
see text part. Results are from the original inventory in mid-2013
In order to contribute to asserting the 3D metadata requirements, the inventory
takes into account the information which by our knowledge and based on the most
mentioned topics of the literature tells various 3D models apart (e.g. type of primi-
tives, extent, vertical reference, format, etc.). The result is a list of several information
items categorized as “
3D Spatial
”, “
LoD
”, “
3D Appearance
”, and “
3D Format
”.
For each inventoried metadata (abbreviated columns of inventory results in
Table
1
), the listed details are labelled by “E” for constituted by an Explicit field,
“I” for noticed in Implicit fields (e.g. written summaries), and “Ø” for not noticed
at all. For example, CGDI's metadata has an explicit field for documenting the
scale factor of the dataset (i.e.
scale denominator
) while it does provide one for
documenting the dimension of the geometric primitives. However, the metadata
documents which have been published in CGDI show that some of the data pro-
viders talk about primitive dimension in the summaries they have appended to the
metadata schema (i.e. implicit). So, implicit (“I” in Table
1
) means that the infor-
mation was found in the examined metadata documents, but not constituted by
the metadata schema. Indeed, implicit metadata can easily change to none as they
depend on the skills of the metadata generators. The inventory results in Table
1
are from the original inventory which was carried out in mid-2013.
To help with perusing the results of the inventory, the following diagram
(Fig.
1
) represents the percentage of explicit metadata (number of “E”s per total
