Digital Orthophotography Metadata Standard
INTRODUCTION
The following document is the standard to collect metadata for digital orthophotographs.
This
standard and additional metadata standards for products such as aerial
photographs and topographic data are available at: www.nsgc.gov.ns.ca/mappingspecs/Specifications/
All
metadata standards available via the above website are Federal Geographic Data
Committee (FGDC) compliant, adhering to guidelines from the FGDC Content
Standard for Digital Geospatial Metadata, also called the FGDC Metadata
Standard.
Metadata
for digital orthophotographs will be compiled in two levels: collection and product.
Collection level metadata – created by NSGC – consists of only one
metadata record describing the overall
series of orthophotos created during a project.
This record will be populated and edited by data owners at NSGC,
using the existing online metadata entry tool, The Nova Scotia Discovery Portal
(http://142.176.62.104/discovery/). This tool complies with the FGDC-compliant
Nova Scotia Metadata Standard. Most fields in the collection level record will
contain data that remains the same for each orthophoto in the series.
Collection level metadata will be housed in the database of the
Nova Scotia Metadata Search Portal and may be found using that site’s search
tool, located here: http://142.176.62.104/gisportal/gisportal
Product level metadata
– created by the contractor – will refer to individual orthophotos. These records will be populated with
information that generally varies per orthophoto, such as title and geographic
reference information.
Product level metadata will be searchable through the Nova Scotia
Metadata Search Portal, but at present will be editable at the desktop only
(not editable online yet).
This document provides a list of the input fields that will
be populated to create a product level record. It also provides descriptions,
examples, and reference to corresponding FGDC elements.
List of Input Fields
An input field is a field specified in a database or text file that requires information to be supplied by a user. The following input fields are required to create a product level metadata record and are discussed in the next section, Input Fields.
01 Orthophoto
Number
02 Orthophoto Name
03 Display Scale
04 East
05 West
06 North
07 South
08 Keyword: NTS
Sheet Number
09 Keyword: NTS
Sheet Name
10 Keyword: GSA or
Community Name
11 Keyword:
12 Keyword:
Province Name
13 Source
Contribution
14 Source(s) Scale
15 Process
Description
16 Process Date
17 File Format
Name
18 Format Version
19 Format Version
Date
20 File Size
21 Vertical Datum
Name
22 Vertical
Distance Units
23 Horizontal
Datum Name
24 Orthophoto
Producer
25 Series Name
26 Series Owner
27 Related
Metadata Records
28 Metadata Date
QUICK REFERENCE
|
|
Input Field: |
Format: |
Length: |
Example(s): |
|
01 |
Orthophoto Number |
free
text |
3 |
0245590062560 |
|
02 |
Orthophoto Name |
free
text |
6 |
|
|
03 |
Display Scale |
numeric
value |
8 |
2000 |
|
04 |
East |
decimal
degrees |
11 |
-62.5600 |
|
05 |
West |
decimal
degrees |
11 |
-62.5800 |
|
06 |
North |
decimal
degrees |
11 |
45.6000 |
|
07 |
South |
decimal
degrees |
11 |
45.5900 |
|
08 |
Keyword: NTS Sheet Number |
free
text |
6 |
11E/12 21A/01 |
|
09 |
Keyword: NTS Sheet Name |
free
text |
100 |
|
|
10 |
Keyword: GSA or Community Name |
free
text |
100 |
|
|
11 |
Keyword: |
free
text |
100 |
|
|
12 |
Keyword: Province |
free
text |
11 |
|
|
13 |
Source Contribution |
free
text |
255 |
aerial
photographs |
|
14 |
Source(s) Scale |
"10000" "18000" other numeric value |
5 |
10000 |
|
15 |
Process Description |
free
text |
255 |
This orthophotography
compiled from aerial photography flown in 2003. |
|
16 |
Process Date |
yyyy-mm-dd or yyyy-mm
or yyyy |
10 |
2005 |
|
17 |
File Format Name |
"TIFF" "JPEG" free text |
100 |
TIFF |
|
18 |
Format Version |
free
text |
100 |
6.0 |
|
19 |
Format Version Date |
yyyy-mm-dd or yyyy-mm
or yyyy |
10 |
2001 |
|
20 |
File Size |
numeric
value + Kb, Mb, or Gb |
10 |
670 Mb |
|
21 |
Vertical Datum Name |
"CGVD1928"
"NAVD1988" "NAVD1928" free
text |
100 |
CGVD1928 |
|
22 |
Vertical Distance Units |
"metres" "feet" free text |
15 |
metres |
|
23 |
Horizontal Datum Name |
"NAD1927"
"NAD1983" "NAD1983CSRS" "ATS1977" free text |
100 |
ATS77 |
|
24 |
Orthophoto Producer |
free
text |
255 |
Atlantic
Air Survey Ltd., 199 Ritcey Cresent, |
|
25 |
Series Name |
free
text |
100 |
Orthophoto
Series 123456 |
|
26 |
Series Owner |
free
text |
255 |
Service |
|
27 |
Related Metadata Records |
free
text |
255 |
Air
Photos: 12345-42 Topo
Data: pictou Orthophoto
Map: 0245590062560-pictou |
|
28 |
Metadata Date |
yyyy-mm-dd |
10 |
2005-08-01 |
Guide to Input Fields
An input field is a field specified in a
database or text file that requires information to be supplied by a user. In
this document input fields are shown in Bold text. Qualifiers following the input
field provide information as to how each field should be populated, including
examples and FGDC references.
## Input
Field
Provides a description of the information required by the
user to populate the input field.
Format: Specific information (words or phrases)
or type of information (free text, dates, etc). Quotes " " around
text in this field indicate that the quoted text is an exact phrase that can be
used to populate an input field.
Example(s): One or more example that illustrates how
to populate each input field.
FGDC Field Title: Corresponding FGDC field title as it appears in the FGDC
Metadata Standard.
FGDC Reference No.: Order of appearance in the FGDC Metadata Standard.
FGDC
Short Name: Reference to the database title of each input
field.
INPUT FIELDS
01 Orthophoto Number
Number of the orthophoto. Naming
convention is "scale + southeast corner" (no spaces).
Format: free text
Example(s): 0245590062560
Field Length: 3
FGDC Field Title: Title
FGDC Reference No.: 8.4
FGDC Short Name: title
02 Orthophoto Name
Name of the orthophoto.
Format: free text
Example(s):
Field Length: 6
FGDC Field Title: Title
FGDC Reference No.: 8.4
FGDC Short Name: title
03 Display Scale
The ratio of the distance on a photograph to the corresponding
distance on the ground. Under FGDC guidelines, scale is expressed using the
denominator only. For example, under these guidelines, a map with a scale of
1:10000 is expressed as 10000 in the metadata record.
Format: numeric value
Example(s): 2000
Field Length: 8
FGDC Field Title: Supplemental Information
FGDC Reference No.: 1.2.3
FGDC Short Name: supplinf
04 East
Eastern-most coordinate of the limit of coverage
expressed in longitude. Decimal places
minimum: 4 maximum: 7.
Format: decimal degrees
Example(s): -62.5600
Field Length: 11
FGDC Field Title: East Bounding Coordinate
FGDC Reference No.: 1.5.1.2
FGDC Short Name: eastbc
05 West
Western-most coordinate of the limit of
coverage expressed in latitude. Decimal places
minimum: 4 maximum: 7.
Format: decimal degrees
Example(s): -62.5800
Field Length: 11
FGDC Field Title: West Bounding Coordinate
FGDC Reference No.: 1.5.1.1
FGDC Short Name: westbc
06 North
Northern-most coordinate of the limit of
coverage expressed in latitude. Decimal places
minimum: 4 maximum: 7.
Format: decimal degrees
Example(s): 45.6000
Field Length: 11
FGDC Field Title: North Bounding Coordinate
FGDC Reference No.: 1.5.1.3
FGDC Short Name: northbc
07 South
Southern-most coordinate of the limit of
coverage expressed in latitude. Decimal places
minimum: 4 maximum: 7.
Format: decimal degrees
Example(s): 45.5900
Field Length: 11
FGDC Field Title: South Bounding Coordinate
FGDC Reference No.: 1.5.1.4
FGDC Short Name: southbc
08 Keyword: NTS Sheet Number
NTS Sheet Number related to the
photograph.
Format: free text
Example(s): 11E/12
21A/01
Field Length: 6
FGDC Field Title: Place Keyword
FGDC Reference No.: 1.6.2.2
FGDC Short Name: placekey
09 Keyword: NTS Sheet Name
NTS Sheet Name related to the map.
Format: free text
Example(s):
Field Length: 100
FGDC Field Title: Place Keyword
FGDC Reference No.: 1.6.2.2
FGDC Short Name: placekey
10 Keyword: GSA or Community Name
Name of the GSA (General Service Area) or
community at the centre point of the
photograph.
Format: free text
Example(s):
Field Length: 100
FGDC Field Title: Place Keyword
FGDC Reference No.: 1.6.2.2
FGDC Short Name: placekey
11 Keyword:
Name of the county(ies) shown in the
photograph.
Format: free text
Example(s):
Field Length: 100
FGDC Field Title: Place Keyword
FGDC Reference No.: 1.6.2.2
FGDC Short Name: placekey
12 Keyword: Province Name
Name of the province shown in the
photograph.
Format: free text
Example(s):
Field Length: 11
FGDC Field Title: Place Keyword
FGDC Reference No.: 1.6.2.2
FGDC Short Name: placekey
13 Source Contribution
Brief statement identifying the
information contributed by the source to the data set.
Format: free text
Example(s): aerial photographs
Field Length: 255
FGDC Field Title: Source Contribution
FGDC Reference No.: 2.5.1.6
FGDC Short Name: srccontr
14 Source(s) Scale
The ratio of the distance on a photograph to the corresponding
distance on the ground. Under FGDC guidelines, scale is expressed using the
denominator only. For example, under these guidelines, a map with a scale of
1:10000 is expressed as 10000 in the metadata record.
Format: "10000"
"18000"
other
numeric value
Example(s): 10000
Field Length: 5
FGDC Field Title: Source Scale Denominator
FGDC Reference No.: 2.5.1.2
FGDC Short Name: srcscale
15 Process Description
A brief written explanation of one or more
steps in the process of creating the orthophoto.
Format: free text
Example(s): This orthophotography compiled from aerial
photography flown
in 2003.
Field Length: 255
FGDC Field Title: Process Description
FGDC Reference No.: 2.5.2.1
FGDC Short Name: procdesc
16 Process Date
The date when the process step was
complete.
Format: yyyy-mm-dd
or yyyy-mm or yyyy
Example(s): 2005
Field Length: 10
FGDC Field Title: Process Date
FGDC Reference No.: 2.5.2.3
FGDC Short Name: procdate
17 File Format Name
Digital file format of the orthophoto
(expressed as shortened version of the extension name).
Format: "TIFF"
"JPEG"
free
text
Example(s): TIFF
Field Length: 100
FGDC Field Title: Format Name
FGDC Reference No.: 6.4.2.1.1
FGDC Short Name: formname
18 Format Version
Version number or name of the file format
used.
Format: free text
Example(s): 6.0
Field Length: 100
FGDC Field Title: Format Version
FGDC Reference No.: 6.4.2.1.2
FGDC Short Name: formvern
19 Format Version Date
Year of the file format version used.
Format: yyyy-mm-dd
or yyyy-mm or yyyy
Example(s): 2001
Field Length: 10
FGDC Field Title: Format Version Date
FGDC Reference No.: 6.4.2.1.3
FGDC Short Name: formverd
20 File Size
The size, or estimated size, of the file
in gigabytes, megabytes, or kilobytes.
Format: numeric value + Kb, Mb, or Gb
Example(s): 670 Mb
Field Length: 10
FGDC Field Title: Transfer Size
FGDC Reference No.: 6.4.2.1.7
FGDC Short Name: transize
21 Vertical Datum Name
The identification given to the surface
taken as the surface of reference from which altitudes
are measured.
Format: "CGVD1928"
"NAVD1988"
"NAVD1928"
free text
Example(s): CGVD1928
Field Length: 100
FGDC Field Title: Altitude Datum Name
FGDC Reference No.: 4.2.1.1
FGDC Short Name: altdatum
22 Vertical Distance Units
Units in which altitudes are recorded.
Format: "metres"
"feet"
free
text
Example(s): metres
Field Length: 15
FGDC Field Title: Altitude Distance Units
FGDC Reference No.: 4.2.1.3
FGDC Short Name: altunits
23 Horizontal Datum Name
The identification given to the reference
system used for defining the coordinates of points.
Format: "NAD1927"
"NAD1983"
"NAD1983CSRS”
"ATS1977"
free text
Example(s): ATS1977
Field Length: 100
FGDC Field Title: Horizontal Datum Name
FGDC Reference No.: 4.1.4.1
FGDC Short Name: horizdn
24 Orthophoto Producer
Name of the organization responsible for production and quality
control of deliverables for a project.
Format: free text
Example(s): Atlantic Air Survey Ltd., 199 Ritcey
Cresent,
Field Length: 255
FGDC Field Title: Data Set Credit
FGDC Reference No.: 1.11
FGDC Short Name: datacred
25 Series Name
The name of the series publication of
which the orthophoto is a part, if applicable..
Format: free text
Example(s): Orthophoto Series 123456
Field Length: 100
FGDC Field Title: Series Name
FGDC Reference No.: 8.7.1
FGDC Short Name: sername
26 Series Owner
The organization that has ownership of the
orthophoto. Enter as: Department, Division,
Branch
Format: free text
Example(s): Service
Information Management Services,
Field Length: 255
FGDC Field Title: Originator
FGDC Reference No.: 8.1
FGDC Short Name: origin
27 Related Metadata Records
Reference all other metadata records required
to complete metadata for this photo, as it
relates to the orthophoto map. Include the
records for the related air photo(s), topographic
data, and orthophoto map(s).
Format: free text
Example(s): Air Photos: 12345-42
Topo Data: pictou
Orthophoto Map: 0245590062560-pictou
Field Length: 255
FGDC Field Title: Title
FGDC Reference No.: 8.4
FGDC Short Name: title
28 Metadata Date
The date that the metadata was created or
last updated.
Format: yyyy-mm-dd
Example(s): 2005-08-01
Field Length: 10
FGDC Field Title: Metadata Date
FGDC Reference No.: 7.1
FGDC Short Name: metd