DatCat℠Internet Measurement Data Catalog

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Object Types

Information in IMDC is organized as Objects, each of which describes a real-world object.
Common Fields
The following fields appear on multiple types of IMDC objects.
Handle
An automatically generated IMDC Handle that uniquely identifies the object.
Name
The object's full name, which will be displayed to other users. If the name is not unique, it may be displayed with a numeric suffix to make it unique.
Contributor
The contact who contributed the metadata for this object to IMDC. Usually an object's contributor is the only user allowed to edit it.
Creators
(on Format, Collection, Location) A list of contacts who created the real-world item described by this IMDC object
Primary contact
(on Format, Collection, Location) Who to contact with questions about the real-world item described by this IMDC object, if different from the creators.
Creation time
The time at which this object was contributed to IMDC
Modification time
The time of the most recent modification to this IMDC object (i.e., the metadata, not the real-world item)
Short description
(on Contact, Format, Collection) A short (up to 128 characters) description of the object, displayed in tables containing the object and at the top of the object's detail page
Description
(on Contact, Format, Collection) A much longer description of the object, displayed only on the object's detail page
Home page
(on Contact, Format, Collection) The full URL of a web page that describes the object.
Keywords
(on Format, Collection) A list of words or short phrases that describe important features of this object, useful for searching.
collection
The core of IMDC is the Collection object. A Collection is a set of closely related data files, usually collected as part of a single effort. A Collection may contain other Collections or Publications to indicate that it contains all the data contained by the others. For example, Collections named “F-root DNS traces” and “A-root DNS traces” might each contain hundreds of data files representing traces taken at the respective root DNS servers, while “Root DNS traces” might contain both of those Collections and thus indirectly contain all data contained by those Collections.
child_coll
A set of Collections and Publications belonging to this Collection.
Summary
A medium-length description of this Collection and its purpose.
Motivation
The motivation behind the creation of this collection, i.e. why the collection's creators thought it would be useful for the contents of this collection to be gathered together.
Data start time, Data duration
These fields roughly describe the time period covered by the data in the collection, although there may be gaps in the coverage.
Creation process
A text description of the procedure used to collect the data in this collection.
Data file size
The size of the (uncompressed) data file, in bytes.
Data file count
The number of the data files in the collection.
format
The Format of data files included in this collection.
Geographic location
The geographic source of the data collection, in terms of continent, country, state, province, city, etc.
Network location
Where on the network the data was collected, in terms of hostname, IP address, AS, etc.
Logistic location
The source of the data from an organizational viewpoint, e.g. “X-root DNS server” or “University of Freedonia off-campus link”.
Platform
The relevant hardware, software, and OS used to collect the data in this collection.
Creation process
A text description of the procedure used to collect the data.
Handle, Collection name, Contributor, Creators, Primary contact, Creation time, Modification time, Short description, Description, Description URL, Keywords
See Common Fields above.
publication
A Publication describes a scholarly paper, article, or other publication that uses Internet measurement data. IMDC is not meant to be a catalog of publications, as that service is already performed by other sites such as Google Scholar and CiteSeer. Rather, the primary purpose of indexing publications in IMDC is to index the data used by the publications. A Publication object in IMDC can be thought of as a specialized kind of Collection representing the data used by the publication. Like a Collection, a Publication may contain other Collection or Publication objects in order to incorporate their contents.
Publication title
The publication's full title.
Authors
A list of contacts who wrote the publication
child_coll
A set of Collections of data used by this Publication.
Venue
The name of the conference, journal, magazine, or other venue where the publication was published.
Summary
A medium-length description of this Publication.
Data description
A longer description of this Publication.
URL
A URL where the full publication can be found.
Publication date
The year and optionally month and day of publication
Data start time, Data duration
These fields roughly describe the time period covered by the data objects used by the publication, although there may be gaps in the coverage.
Creation process
A text description of the procedure used to collect the data used in this publication.
format
The Format of data files included in this collection.
Handle, Contributor, Primary contact, Creation time, Modification time, Keywords
See Common Fields above.
location
A Location object represents a method for obtaining a Collection of data. Collections available via multiple means (e.g., mirrors) will have a distinct Location object for each. Often a Location will include a URL linked directly to a collection directory (external to IMDC), although it may be password-protected or otherwise restricted. If the Location is restricted in any way, such as requiring owner approval or agreement to an AUP, there will be instructions on how to proceed.
For Collection
The Collection hosted at this Location.
Download URL
A URL linked directly to a directory where the data in the collection can be downloaded.
Download procedure
Additional text instructions on how to obtain the collection, if necessary.
Geographic location
The geographic location of the server described in this Location, to help users choose between multiple Locations for the same Collection.
Logistic location
The location of the download server from an organizational viewpoint, e.g. “CAIDA” or “University of Freedonia”.
Availability
“Free” if anyone may obtain the collection without restrictions, or “Restricted” if obtaining the collection requires a password or agreement to an AUP or has other restrictions.
Status
The status of this Location: “Active” or “Disabled”.
Handle, Name, Contributor, Creators, Primary contact, Creation time, Modification time, Short description, Description, Home page, Keywords
See Common Fields above.
contact
Contact objects describe a person or role. Contacts are used to describe the creators of collections and other cataloged items. Every IMDC login account is also a Contact.
Login
(on login accounts only) A unique string of 3-80 non-space characters used to log in to IMDC.
Password
(on login accounts only) A secret string of 4-40 characters.
Private email
(on login accounts only) An address at which IMDC can send email to the user. This address will never be given out to anyone else. When an account is created, this address will be subscribed to IMDC mailing list(s); but if you wish to change the address used for a mailing list later, you must visit the mailing list pages directly.
Time zone
(on login accounts only) The user's preferred time zone. This is used for displaying and optionally inputting dates and times.
Type
“person” if this contact describes an individual person (e.g. “John Smith”), or “role” if this contact describes a job or function independently of the person or people who perform it (e.g. “FooNet Data Manager”).
Public email
An email address that will be given out to other users.
Phone
The contact's phone number. You may choose to hide this from other users.
Address
The contact's postal address. You may choose to hide this from other users.
Country
The contact's country. You may choose to hide this from other users.
Organization
The organization to which the contact belongs.
Handle, Full name, Contributor, Creation time, Modification time, Job title or short description, Description, Home page, Keywords
See Common Fields above.
format
A Data Format (e.g., “pcap”) describes the file format used by raw data files, and a Package Format (e.g., “tar-gzip”) describes the file format used to bundle multiple data files together into a single file.
Type
Describes whether the file format is binary, text, or mixed.
suffixes
A set of suffixes commonly used on the names of files of this format (e.g., “.pcap” or “.tar.gz”).
Handle, Format name, Contributor, Creators, Primary contact, Creation time, Modification time, Short description, Description, Description URL, Keywords
See Common Fields above.
annotation
An annotation is an extra piece of text attached to an IMDC object. Any user can attach an annotation to an object.
Subject
The object to which this Annotation refers.
Value
The text value of this annotation.
Handle, Contributor, Creation time, Modification time
See Common Fields above.