2. What Is Geoinformatics:
Geoinformatics is the science and the technology
which develops and uses information science,
infrastructure to address the problems of geography,
geosciences and related branches of engineering.
“The art, science or technology dealing with the
acquisition, storage, processing, production,
presentation and dissemination of geoinformation“
3. Branches of geoinformatics
include:
1. Remote Sensing
2. Geographic Information Systems (GIS)
3. Cartography
4. Global Navigation Satellite Systems
5. Photogrammetry
6. DBMS- Data Base Management System
4. Remote Sensing:
Remote sensing is the acquisition of information about
an object or phenomenon without making physical
contact with the object.
Remote sensing is the technique of deriving information
about objects on the surface of the earth without
physically coming into contact with them. This process
involves making observations using sensors mounted on
platforms (aircraft and satellites), which are at a
considerable height from the earth surface and recording
the observations on a suitable medium.
6. Sensor:
Sensor is a device that measures and records
electromagnetic energy.
Types of sensors,
1. Passive sensors:
2.Active sensors:
7. Passive Remote Sensing
Passive remote sensing use reflected
or emitted electromagnetic energy
from the natural sources like sun. The
passive remote sensing system mainly
depending on the solar radiations.
The Remote sensing system that uses
electromagnetic energy are called
Electromagnetic or Passive remote
sensing.
Examples:
Passive microwave radiometer
8. Active Remote sensing:
Active Remote sensing are the sensors which
emit their own source of energy. An active
remote sensing system generates and uses its
own source of energy.
Examples:
Lidar (LIght Detection And Ranging)
Radar (RAdio Detection And Ranging)
Falcon II LIDAR
9. REMOTE SENSING PLATFORMS
Platform is a stage to mount the camera or sensor to
acquire the information about a target under
investigation. Based on its altitude above earth
surface, platforms may be classified as
Ground borne Platforms
Air borne Platforms
Space borne Platforms
11. Air Borne Platforms
In this type of sensors are mounted on air based
platforms.
Aircrafts are generally used to acquire aerial
photographs for photo-interpretation and
photogrammetric purposes.
Example: airplanes, helicopters, high-altitude
aircrafts, balloons.
Beechcraft KING AIR
C90
12. Space-Borne Platforms
In this type of sensors are mounted mainly on
satellites.
Example: rockets, satellites, shuttle at a hieght
100 km to 36000 km
Space shuttle: 250-300 km
Space station: 300-400 km
Low-level satellites: 700-1500 km
High-level satellites: about 36000 km
13. Depending on their altitudes and orbit these
platforms may be divided in two categories:
Geostationary
Polar orbiting or Sun-synchronous
14. Polar satellites:
Polar orbiting satellites, whose orbits are in the
plane of the Earth’s polar axis.
Orbit of Polar orbiting satellites:
16. Sun synchronous satellites:
An earth satellite orbit in which the
orbital plane is near polar and the
altitude is such that the satellite
passes over all places on earth
having the same latitude twice in
each orbit at the same local sun-
time.These satellites orbit at a
altitude betweeen 700 to 800 km.
These satellites the entire globe is
covered on regular basis and gives
repetitive coverage on periodic
basis.
Few of these satellites are Landsat
series, SPOT series, IRS series,
NOAA, SEASAT, TIROS etc.
17. Geosynchronous satellites:
Geostationary satellites are
“fixed” above a given point on the
Earth surface because their
circular orbits above the equator
have rotation period equals to the
earth’s rotation period.
An equatorial west to east satellite
orbiting the earth at an altitude of
36000 km. The altitude at which it
makes one revolution in 24 hours,
synchronous with earth's rotation.
Geosynchronous satellite:
18. These platforms are covering the same place and give
continuous coverage over the same area day and
night.
These are mainly used for communication and
meteorological applications.
Eg: GEOS, METOSAT, INTELSAT and INSAT
satellites
19. Geographic Information Systems
(GIS)
GIS is a computer based
information system used
to digitally represent
and analyse geospatial
data.
Spatial data: Data
which can be
represented using
geographical cordinate
system (latitude and
longitude)
20. Defination of GIS
A geographic information system (GIS) is a computer-based
system for the storage, retrieval, manipulation, analysis, and
display of geographic data.
Computer-based system refers to the hardware, software,
and procedures necessary to operate the GIS.
Geographic data are data which vary over geographical area.
Storage, retrieval, manipulation, analysis, and display are the
“tools” provided by GIS software for processing geographic
data.
21. GIS in general
It is a system of hardware, software and procedures which
enable management, manipulation, analysis, modeling,
representation and display of geo-referenced data to solve
complex problems regarding planning and management of
resources.
Mapping of
Roads network
Settlements
Water bodies
Hospitals
Railway
Airport
Soil type
22. Components of a GIS:
A working GIS integrates these
five key components:
Hardware
Software
Data
People
Methods.
23. Hardware:
Hardware is the computer on
which a GIS softwares operates.
Today, GIS runs on a wide range of
hardware types, from centralized
computer servers to desktop
computers.
Software:
GIS software provides the
functions and tools needed to
store, analyze, and digitize, and
display geographic information.
24. Data:
The most important component of a GIS is the data. Geographic data
and related tabular data can be collected from the field or bought
from a commercial data provider. Most GIS employ a DBMS to create
and maintain a database to help organize and manage data.
People:
GIS technology is only of limited value without the people who
manage the system and to develop plans for applying it. GIS users
range from technical specialists who design and maintain the system,
to those who use it to help them do their everyday work.
Methods:
A successful GIS operates according to a well-designed plan and
business rules, which are the models and operating practices unique
to each organization.
27. Global Navigation Systems:
The Global Positioning System (GPS) is a space-
based satellite navigation system that provides
location and time information in all weather
conditions, anywhere on or near the Earth where
there is an unobstructed line of sight to four or more
GPS satellites
Global Positioning satellite System (GPS)
28. Photogrammetry:
Photogrammetry is the art and science of
making accurate measurements and obtaining
reliable information by means of aerial
photography.
aerial survey
29. DBMS- Data Base Management
System
DBMS is a software designed to assist in
maintaining and utilizing large collection
of data.
Example: Oracle, SQL
