- Photogrammetry is the science of obtaining reliable information from photographic images. It involves recording, measuring, and interpreting images and electromagnetic radiation.
- There are two main types: terrestrial photogrammetry which uses ground-based photos, and aerial photogrammetry which uses photos taken from aircraft.
- Vertical aerial photos are easier to interpret but cover less ground, while oblique photos cover more area but are harder to interpret. Photogrammetry is used to create maps and 3D models.
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.
This presentation about photogrammetry survey, this presentation gives a complete detail of photogrammetry survey. Photogrammetry survey is a powerful technique used in various industries to obtain accurate measurements and three-dimensional (3D) data from photographs. It involves the process of extracting precise geometric information from images using specialized software, providing a cost-effective and efficient method for capturing and analysing spatial data.
Data Centers - Striving Within A Narrow Range - Research Report - MCG - May 2...pchutichetpong
M Capital Group (“MCG”) expects to see demand and the changing evolution of supply, facilitated through institutional investment rotation out of offices and into work from home (“WFH”), while the ever-expanding need for data storage as global internet usage expands, with experts predicting 5.3 billion users by 2023. These market factors will be underpinned by technological changes, such as progressing cloud services and edge sites, allowing the industry to see strong expected annual growth of 13% over the next 4 years.
Whilst competitive headwinds remain, represented through the recent second bankruptcy filing of Sungard, which blames “COVID-19 and other macroeconomic trends including delayed customer spending decisions, insourcing and reductions in IT spending, energy inflation and reduction in demand for certain services”, the industry has seen key adjustments, where MCG believes that engineering cost management and technological innovation will be paramount to success.
MCG reports that the more favorable market conditions expected over the next few years, helped by the winding down of pandemic restrictions and a hybrid working environment will be driving market momentum forward. The continuous injection of capital by alternative investment firms, as well as the growing infrastructural investment from cloud service providers and social media companies, whose revenues are expected to grow over 3.6x larger by value in 2026, will likely help propel center provision and innovation. These factors paint a promising picture for the industry players that offset rising input costs and adapt to new technologies.
According to M Capital Group: “Specifically, the long-term cost-saving opportunities available from the rise of remote managing will likely aid value growth for the industry. Through margin optimization and further availability of capital for reinvestment, strong players will maintain their competitive foothold, while weaker players exit the market to balance supply and demand.”
Adjusting primitives for graph : SHORT REPORT / NOTESSubhajit Sahu
Graph algorithms, like PageRank Compressed Sparse Row (CSR) is an adjacency-list based graph representation that is
Multiply with different modes (map)
1. Performance of sequential execution based vs OpenMP based vector multiply.
2. Comparing various launch configs for CUDA based vector multiply.
Sum with different storage types (reduce)
1. Performance of vector element sum using float vs bfloat16 as the storage type.
Sum with different modes (reduce)
1. Performance of sequential execution based vs OpenMP based vector element sum.
2. Performance of memcpy vs in-place based CUDA based vector element sum.
3. Comparing various launch configs for CUDA based vector element sum (memcpy).
4. Comparing various launch configs for CUDA based vector element sum (in-place).
Sum with in-place strategies of CUDA mode (reduce)
1. Comparing various launch configs for CUDA based vector element sum (in-place).
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Empowering the Data Analytics Ecosystem: A Laser Focus on Value
The data analytics ecosystem thrives when every component functions at its peak, unlocking the true potential of data. Here's a laser focus on key areas for an empowered ecosystem:
1. Democratize Access, Not Data:
Granular Access Controls: Provide users with self-service tools tailored to their specific needs, preventing data overload and misuse.
Data Catalogs: Implement robust data catalogs for easy discovery and understanding of available data sources.
2. Foster Collaboration with Clear Roles:
Data Mesh Architecture: Break down data silos by creating a distributed data ownership model with clear ownership and responsibilities.
Collaborative Workspaces: Utilize interactive platforms where data scientists, analysts, and domain experts can work seamlessly together.
3. Leverage Advanced Analytics Strategically:
AI-powered Automation: Automate repetitive tasks like data cleaning and feature engineering, freeing up data talent for higher-level analysis.
Right-Tool Selection: Strategically choose the most effective advanced analytics techniques (e.g., AI, ML) based on specific business problems.
4. Prioritize Data Quality with Automation:
Automated Data Validation: Implement automated data quality checks to identify and rectify errors at the source, minimizing downstream issues.
Data Lineage Tracking: Track the flow of data throughout the ecosystem, ensuring transparency and facilitating root cause analysis for errors.
5. Cultivate a Data-Driven Mindset:
Metrics-Driven Performance Management: Align KPIs and performance metrics with data-driven insights to ensure actionable decision making.
Data Storytelling Workshops: Equip stakeholders with the skills to translate complex data findings into compelling narratives that drive action.
Benefits of a Precise Ecosystem:
Sharpened Focus: Precise access and clear roles ensure everyone works with the most relevant data, maximizing efficiency.
Actionable Insights: Strategic analytics and automated quality checks lead to more reliable and actionable data insights.
Continuous Improvement: Data-driven performance management fosters a culture of learning and continuous improvement.
Sustainable Growth: Empowered by data, organizations can make informed decisions to drive sustainable growth and innovation.
By focusing on these precise actions, organizations can create an empowered data analytics ecosystem that delivers real value by driving data-driven decisions and maximizing the return on their data investment.
As Europe's leading economic powerhouse and the fourth-largest hashtag#economy globally, Germany stands at the forefront of innovation and industrial might. Renowned for its precision engineering and high-tech sectors, Germany's economic structure is heavily supported by a robust service industry, accounting for approximately 68% of its GDP. This economic clout and strategic geopolitical stance position Germany as a focal point in the global cyber threat landscape.
In the face of escalating global tensions, particularly those emanating from geopolitical disputes with nations like hashtag#Russia and hashtag#China, hashtag#Germany has witnessed a significant uptick in targeted cyber operations. Our analysis indicates a marked increase in hashtag#cyberattack sophistication aimed at critical infrastructure and key industrial sectors. These attacks range from ransomware campaigns to hashtag#AdvancedPersistentThreats (hashtag#APTs), threatening national security and business integrity.
🔑 Key findings include:
🔍 Increased frequency and complexity of cyber threats.
🔍 Escalation of state-sponsored and criminally motivated cyber operations.
🔍 Active dark web exchanges of malicious tools and tactics.
Our comprehensive report delves into these challenges, using a blend of open-source and proprietary data collection techniques. By monitoring activity on critical networks and analyzing attack patterns, our team provides a detailed overview of the threats facing German entities.
This report aims to equip stakeholders across public and private sectors with the knowledge to enhance their defensive strategies, reduce exposure to cyber risks, and reinforce Germany's resilience against cyber threats.
2. Photogrammetry
Photogrammetry is the art, science, and technology of
obtaining reliable information about physical objects and the
environment through processes of recording, measuring,
and interpreting photographic images and patterns of
Electromagnetic radiant energy and other phenomena
3.
4.
5. Photogrammetry
Derived from 3 Greek words
– photos – light
– gramma - something drawn or written
– metron - to measure
8. Definitions
Camera axis Line passing through the centre of the camera
lens perpendicular both to the camera plate (negative) and
the picture plane (photograph)
Picture plane Plane perpendicular to the camera axis at the focal
distance in front of the lens.
Principal point Intersection of camera axis with either the picture
plane (positive) or the camera plate (negative)
Focal length Perpendicular distance from the centre of camera lens
to either the picture plane or the camera plate
9. Definitions
Focal plane (image plane) plane (perpendicular to the axis
of the lens) in which images of points in the object space
of the lens are focused
Perspective Centre Every light ray, which reached the film
surface during exposure, passed through the camera lens
(which is mathematically considered as a single point, the
so called “perspective center”)
A photographic image is thus a “central perspective”.
10. Basic elements
● Fiducial marks
Marks at the edges and corners recorded during
exposure
● Principal point
Point of intersection of lines connecting opposite
pairs of fiducial marks
11. Basic Elements
Ground nadir
point on the ground verticallybeneath the center ofthe camera
lensduringexposure
Photographic nadir
intersection of the photograph and the vertical line that
intersects the ground nadir andthe center ofthe lens
13. Principally, photogrammetry can be divided
into:
1.Depending on the lens-setting:
• Far range photogrammetry (with camera
distance setting to indefinite), and
• Close range photogrammetry (with camera
distance settings to finite values).
14.
15. •
Terrestrial photogrammetry (mostly close range
photogrammetry)
Branch of photogrammetry wherein photographs are
taken from a fixed position on or near the ground
Aerial photogrammetry (mostly far range
photogrammetry)
Photographs are taken by a camera mounted in an
aircraft flying over the area
16.
17. Oblique photographs
- Cameras oriented toward the side of the aircraft
Vertical photographs
-camera aimed directly at the ground
surface from above
-difficult to recognize ground features but
measurements can be made
18.
19.
20. -Vertical aerial photograph
-an aerial photograph is considered vertical only if the
isocenter, nadir and the principal point are in perfect
alignment
-Orthophoto
-a digital image derived from aerial photography where
all distortions and displacements have been removed
photogrammetrically
26. Advantages
An aerial photograph has the following advantages over a map:
1. It provides a current pictorial view of the ground that no map can
equal.
2. It is more readily obtained. The photograph may be in the hands
of the user within a few hours after it is taken; a map may take
months to prepare.
3. It may be made for places that are inaccessible to ground
soldiers.
4. It shows military features that do not appear on maps.
5. It can provide a day-to-day comparison of selected areas,
permitting evaluations to be made of enemy activity.
6. It provides a permanent and objective record of the day-to-day
changes with the area.
27. Disadvantages
The aerial photograph has the following disadvantages as
compared to a map:
1. Ground features are difficult to identify or interpret without
symbols and are often obscured by other ground detail as,
for example, buildings in wooded areas.
2. Position location and scale are only approximate.
3. Detailed variations in the terrain features are not readily
apparent without overlapping photography and a
stereoscopic viewing instrument.
4. Because of a lack of contrasting colors and tone, a
photograph is difficult to use in poor light.
5. It lacks marginal data.
6. It requires more training to interpret than a map.
28. Uses and Users
Aerial photogrammetry is mainly used to produce
topographical or thematical maps and digital terrain models.
Among the users of close-range photogrammetry are
architects and civil engineers (to supervise buildings,
document their current state, deformations or damages),
archaeologists,
29. Advantages of vertical over oblique aerial photographs
Vertical photographs present approximately uniform scale The
determination of directions (i.e., bearing or azimuth) can be performed in
the same manner as a map.
●
●
Vertical photographs are easier to interpret than oblique
photographs.
tall objects (e.g., buildings, trees, hills, etc.) will not mask other
objects as much as they would on oblique photos.
●
●
simple to use photogrammetrically as a minimum of
mathematical correction is required.
To some extent and under certain conditions (e.g., flat terrain), a
vertical aerial photograph may be used as a map if a coordinate grid
system and legend information are added.
● Stereoscopic study is also more effective on vertical than on oblique
photographs.
30. Advantages of oblique over vertical aerial photographs
covers more ground area than a vertical photo taken from the
same altitude and with the same focal length.
If an area is frequently covered by cloud layer
Oblique photos have a more natural view
Objects that are under trees or under other tall objects may not
be visible on vertical photos if they are viewed from above.
Determination of feature elevations is more accurate using
oblique photograph than vertical aerial photographs.
oblique aerial photos are not used for photogrammetric and
precision purposes, they may use inexpensive cameras.
31. Terrestrial Photogrammetry
• Basic Principles
• Similarto planetable surveying.
• If the directions of the same objects photographed from two extremities of
measuredbaseare knowntheir position canbe located bythe intersection oftwo
raysto the sameobject
33. Terrestrial Photogrammetry classifications
Plane table photogrammetry Consists essentially in
taking a photograph of the area to be mapped from
each of the two or three stations.
Terrestrial stereophotogrammetry
The camera base and the angles of intersection of the
datum rays to the points to be measured
can be considerably reduced since the camera axes at
two stations exhibit great similarity at two stations.
The image points which are parallactically displaced
relative to each other in the two photographs are fused
to a single spatial image by the stereoscopic
measurement
36. Photo Theodolite
The instrument consists of a photographic camera with an internal
compasscard, housedin analuminumbox with a horizontal circle below,
and atransit-mounted telescope with vertical arc above. The horizontal
circle isgraduated to 30 minutes, and read by vernier to single minutes.
The vertical arc extends 90 degrees either way, and is graduated to 30
minutes and read by vernier and small telescope to single minutes. The
whole instrument sits on a tribach base, suitable for mounting on a
tripod.