Remote sensing began with aerial photography in the 1800s. It involves collecting data about the Earth's surface from a distance using electromagnetic sensors. Vertical aerial photographs are important for remote sensing as they have minimal distortion and can be used to take measurements. Photogrammetry allows calculating scale and measurements from aerial photos using factors like focal length and aircraft height. Stereopairs of aerial photos enable measuring terrain height differences through parallax, similar to how human binocular vision perceives depth.
Photograph taken from an aircraft commonly termed as aerial photograph have come to play and ever increasing role in the execution in cartographic mapping in various scales and in evaluation of natural resources of a region. Uses of aerial photographs in other fields are also manifold; in fact the scope seems limitless.
Photograph taken from an aircraft commonly termed as aerial photograph have come to play and ever increasing role in the execution in cartographic mapping in various scales and in evaluation of natural resources of a region. Uses of aerial photographs in other fields are also manifold; in fact the scope seems limitless.
Types of Platforms
1. Airbrone Platforms
2. Spacebrone Platforms
Platforms are Vital Role in remote sensing data acquisition
Necessary to correct the position the remote sensors that collect data from the objects of interest
Aerial surveying technology is utilized in a wide range of fields throughout the world. These range from the creation of maps, to terrain analysis and research (rivers, soil erosion, coasts, etc.), urban planning, road planning (roads, rails, etc.), and vegetation research (forests, agriculture, lakes and marshland, etc.).
Types of Platforms
1. Airbrone Platforms
2. Spacebrone Platforms
Platforms are Vital Role in remote sensing data acquisition
Necessary to correct the position the remote sensors that collect data from the objects of interest
Aerial surveying technology is utilized in a wide range of fields throughout the world. These range from the creation of maps, to terrain analysis and research (rivers, soil erosion, coasts, etc.), urban planning, road planning (roads, rails, etc.), and vegetation research (forests, agriculture, lakes and marshland, etc.).
Remote Sensing Data Acquisition,Scanning/Imaging systemsdaniyal rustam
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We have compiled the most important slides from each speaker's presentation. This year’s compilation, available for free, captures the key insights and contributions shared during the DfMAy 2024 conference.
Using recycled concrete aggregates (RCA) for pavements is crucial to achieving sustainability. Implementing RCA for new pavement can minimize carbon footprint, conserve natural resources, reduce harmful emissions, and lower life cycle costs. Compared to natural aggregate (NA), RCA pavement has fewer comprehensive studies and sustainability assessments.
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Understanding Inductive Bias in Machine LearningSUTEJAS
This presentation explores the concept of inductive bias in machine learning. It explains how algorithms come with built-in assumptions and preferences that guide the learning process. You'll learn about the different types of inductive bias and how they can impact the performance and generalizability of machine learning models.
The presentation also covers the positive and negative aspects of inductive bias, along with strategies for mitigating potential drawbacks. We'll explore examples of how bias manifests in algorithms like neural networks and decision trees.
By understanding inductive bias, you can gain valuable insights into how machine learning models work and make informed decisions when building and deploying them.
Online aptitude test management system project report.pdfKamal Acharya
The purpose of on-line aptitude test system is to take online test in an efficient manner and no time wasting for checking the paper. The main objective of on-line aptitude test system is to efficiently evaluate the candidate thoroughly through a fully automated system that not only saves lot of time but also gives fast results. For students they give papers according to their convenience and time and there is no need of using extra thing like paper, pen etc. This can be used in educational institutions as well as in corporate world. Can be used anywhere any time as it is a web based application (user Location doesn’t matter). No restriction that examiner has to be present when the candidate takes the test.
Every time when lecturers/professors need to conduct examinations they have to sit down think about the questions and then create a whole new set of questions for each and every exam. In some cases the professor may want to give an open book online exam that is the student can take the exam any time anywhere, but the student might have to answer the questions in a limited time period. The professor may want to change the sequence of questions for every student. The problem that a student has is whenever a date for the exam is declared the student has to take it and there is no way he can take it at some other time. This project will create an interface for the examiner to create and store questions in a repository. It will also create an interface for the student to take examinations at his convenience and the questions and/or exams may be timed. Thereby creating an application which can be used by examiners and examinee’s simultaneously.
Examination System is very useful for Teachers/Professors. As in the teaching profession, you are responsible for writing question papers. In the conventional method, you write the question paper on paper, keep question papers separate from answers and all this information you have to keep in a locker to avoid unauthorized access. Using the Examination System you can create a question paper and everything will be written to a single exam file in encrypted format. You can set the General and Administrator password to avoid unauthorized access to your question paper. Every time you start the examination, the program shuffles all the questions and selects them randomly from the database, which reduces the chances of memorizing the questions.
HEAP SORT ILLUSTRATED WITH HEAPIFY, BUILD HEAP FOR DYNAMIC ARRAYS.
Heap sort is a comparison-based sorting technique based on Binary Heap data structure. It is similar to the selection sort where we first find the minimum element and place the minimum element at the beginning. Repeat the same process for the remaining elements.
Heap Sort (SS).ppt FOR ENGINEERING GRADUATES, BCA, MCA, MTECH, BSC STUDENTS
1 2 aerial photography
1. Remote Sensing and Image Processing
PDF
Aerial Photography and Photogrammetry
2. Structure
• Definitions of Remote Sensing
• Origins of remote sensing
• Types of aerial photograph
• Photogrammetry
• Parallax
• Human vision
• Conclusions
3. Definitions of Remote Sensing
Can be very general, e.g.
“The acquisition of physical data of an
object without touch or contact” (Lintz
and Simonett, 1976)
“The observation of a target by a device
some distance away” (Barrett and Curtis,
1982)
4. Definitions of Remote Sensing
Or more specific, e.g.
“The use of electromagnetic radiation
sensors to record images of the
environment, which can be interpreted to
yield useful information” (Curran, 1985)
5. Definitions of Remote Sensing
Or more specific, e.g.
“The use of sensors, normally operating at
wavelengths from the visible to the
microwave, to collect information about the
Earth’s atmosphere, oceans, land and ice
surfaces” (Harris, 1987)
6. Definitions of Remote Sensing
Main characteristics
• Physical separation between sensor and
target
• Medium = electromagnetic radiation (sonar
is an exception)
• Device to sample and measure radiation
(sensor)
• Target is the terrestrial environment
(atmosphere, oceans, land surface)
26. Types of aerial photograph
Principal
point
Marginal
information
27. Types of aerial photograph
An aerial photograph mission
will be flown in strips, shutter
timing set for 60% endlap
(needed for parallax) and strips
spaced for 30% sidelap (to avoid
missing bits)
28. Types of aerial photograph
• Endlap (or forelap) is the
important bit
• It ensures every point on the
ground appears in at least two
photographs
• Distance between principal point
of adjacent photographs is known as
the “air base”
29. Structure
• Definitions of Remote Sensing
• Origins of remote sensing
• Types of aerial photograph
• Photogrammetry
• Parallax
• Human vision
• Conclusions
30. Photogrammetry
If you know focal length of
camera and height of
aircraft above the ground
you can calculate the scale
of the photograph
35. Photogrammetry
But to take “true”
measurements on an uneven
surface you need
to work in 3-D
You can do
this thanks to
parallax
36. Structure
• Definitions of Remote Sensing
• Origins of remote sensing
• Types of aerial photograph
• Photogrammetry
• Parallax
• Human vision
• Conclusions
37. Parallax
Pencil is very displaced because it is close to observer
Church is less displaced because it is further away
38. Parallax
Parallax is used to find distance to stars, using two viewing
points on either side of Earth’s orbit
39. Parallax
The same principle can be used to find height of objects in
stereopairs of vertical aerial photographs
40. Parallax
H = height of aircraft above ground
P = absolute parallax at base of object being measured*
dP = differential parallax
* For convenience the photo base length of a stereo pair is
commonly substituted for absolute stereoscopic parallax (P)
41. Structure
• Definitions of Remote Sensing
• Origins of remote sensing
• Types of aerial photograph
• Photogrammetry
• Parallax
• Human vision
• Conclusions
42. Human vision
Human vision is binocular in most
cases, and human eyes can resolve
parallax as angle of convergence
This provides perception of
“depth” and enables us to judge
distances (up to 400m)
Eye base (6-7cm)
43. Human vision
3-D stereoptic viewing of
the Earth’s surface is
possible using
overlapping pairs of
vertical stereo aerial
photographs
44. Human vision
Two types of
light-sensitive
cells are
present in the
retina:
• Cones are sensitive to radiation of specific wavelengths
(either red, green or blue)
• Rods are sensitive to all visible wavelengths
45. Human vision
Two types of
light-sensitive
cells are
present in the
retina:
• Cones are clustered around the fovea centralis
• Rods are widely distributed elsewhere
47. Structure
• Definitions of Remote Sensing
• Origins of remote sensing
• Types of aerial photograph
• Photogrammetry
• Parallax
• Human vision
• Conclusions
48. Conclusions
• Remote sensing involves collecting information
about the Earth from a distance using
electromagnetic sensors
• It evolved from aerial photography
• Vertical stereopairs of aerial photographs are used
to take 3-D measurements by measuring parallax
• Human vision is binocular, enabling us to resolve
parallax for depth perception
• Human vision includes perception of colour