Adbms 45 spatial and multimedia databases

Jan 20, 2021Download as pptx, pdf0 likes187 views

Spatial Database Concepts • Keep track of objects in a multi-dimensional space – Maps – Geographical Information Systems (GIS) – Weather • In general spatial databases are n-dimensional – This discussion is limited to 2-dimensional spatial databases

Advance Database Management Systems :45
Spatial and Multimedia Databases
Prof Neeraj Bhargava
Vaibhav Khanna
Department of Computer Science
School of Engineering and Systems Sciences
Maharshi Dayanand Saraswati University Ajmer

Slide 24- 2
Spatial and Multimedia Databases
• Spatial Database Concepts
• Multimedia Database Concepts

Slide 24- 3
Spatial Databases
Spatial Database Concepts
• Keep track of objects in a multi-dimensional
space
– Maps
– Geographical Information Systems (GIS)
– Weather
• In general spatial databases are n-dimensional
– This discussion is limited to 2-dimensional spatial
databases

Slide 24- 4
Spatial Databases
Spatial Database Concepts
• Typical Spatial Queries
– Range query: Finds objects of a particular type within a
particular distance from a given location
• E.g., Taco Bells in Pleasanton, CA
– Nearest Neighbor query: Finds objects of a particular type that
is nearest to a given location
• E.g., Nearest Taco Bell from an address in Pleasanton, CA
– Spatial joins or overlays: Joins objects of two types based on
some spatial condition (intersecting, overlapping, within certain
distance, etc.)
• E.g., All Taco Bells within 2 miles from I-680.

Slide 24- 5
Spatial Databases
Spatial Database Concepts
• R-trees
– Technique for typical spatial queries
– Group objects close in spatial proximity on the
same leaf nodes of a tree structured index
– Internal nodes define areas (rectangles) that cover
all areas of the rectangles in its subtree.
• Quad trees
– Divide subspaces into equally sized areas

Slide 24- 6
Multimedia Databases
Multimedia Database Concepts
• In the years ahead multimedia information
systems are expected to dominate our daily lives.
– Our houses will be wired for bandwidth to handle
interactive multimedia applications.
– Our high-definition TV/computer workstations will
have access to a large number of databases, including
digital libraries, image and video databases that will
distribute vast amounts of multisource multimedia
content.

Slide 24- 7
Multimedia Databases
• Types of multimedia data are available in
current systems
– Text: May be formatted or unformatted. For ease
of parsing structured documents, standards like
SGML and variations such as HTML are being
used.
– Graphics: Examples include drawings and
illustrations that are encoded using some
descriptive standards (e.g. CGM, PICT, postscript).

Slide 24- 8
Multimedia Databases
• Types of multimedia data are available in
current systems (contd.)
– Images: Includes drawings, photographs, and so
forth, encoded in standard formats such as
bitmap, JPEG, and MPEG. Compression is built into
JPEG and MPEG.
• These images are not subdivided into components.
Hence querying them by content (e.g., find all images
containing circles) is nontrivial.
– Animations: Temporal sequences of image or
graphic data.

Slide 24- 9
Multimedia Databases
• Types of multimedia data are available in
current systems (contd.)
– Video: A set of temporally sequenced
photographic data for presentation at specified
rates– for example, 30 frames per second.
– Structured audio: A sequence of audio
components comprising note, tone, duration, and
so forth.

Slide 24- 10
Multimedia Databases
• Types of multimedia data are available in
current systems (contd.)
– Audio: Sample data generated from aural
recordings in a string of bits in digitized form.
Analog recordings are typically converted into
digital form before storage.

Slide 24- 11
Multimedia Databases
• Types of multimedia data are available in
current systems (contd.)
– Composite or mixed multimedia data: A
combination of multimedia data types such as
audio and video which may be physically mixed to
yield a new storage format or logically mixed while
retaining original types and formats. Composite
data also contains additional control information
describing how the information should be
rendered.

Slide 24- 12
Multimedia Databases
• Nature of Multimedia Applications:
– Multimedia data may be stored, delivered, and
utilized in many different ways.
– Applications may be categorized based on their
data management characteristics.

Assignment
• Explain the importance of multimedia
databases

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