This document provides an overview of photogrammetry and how it can be used to create different types of maps from aerial images captured by drones. It discusses how orthomosaics, 3D models, NDVI maps, thermal maps, and other products can be generated from drone imagery using photogrammetry software. It also covers best practices for drone data acquisition such as camera selection, flight planning, image overlap, and use of ground control points to produce accurate georeferenced maps and models.
High Exposure strives to provide developers with accurate data that ensures you can have a solid understanding of the land, property, and potential of the terrain being mapped.
For more details you can visit athttps://www.highexposure.com.au/aerial-photography-for-aerial-mapping/
Critical Infrastructure Monitoring Using UAV Imageryaditess
The use of two rapidly evolving approaches, the Unmanned Aerial Vehicles (UAVs) and Dense Image Matching (DIM) techniques is an attractive solution to extract high quality photogrammetric products like 3D point clouds and orthoimages.
High Exposure strives to provide developers with accurate data that ensures you can have a solid understanding of the land, property, and potential of the terrain being mapped.
For more details you can visit athttps://www.highexposure.com.au/aerial-photography-for-aerial-mapping/
Critical Infrastructure Monitoring Using UAV Imageryaditess
The use of two rapidly evolving approaches, the Unmanned Aerial Vehicles (UAVs) and Dense Image Matching (DIM) techniques is an attractive solution to extract high quality photogrammetric products like 3D point clouds and orthoimages.
Photogrammetry: Latest Technology to Create Maps Using Drones?NI BT
To know more about Photogrammetry: Latest Technology to Create Maps Using Drones and also get information of aerial photogrammetry, drone photogrammetry which can be used in Geographical informational system industries
This paper will discuss three different aspects of surveying technology, namely the types of surveying technologies available for use in a quarry environment, the types of applications the surveying technologies are used for and comparative performance of different surveying technologies in measuring stockpile volumes.
Photogrammetry Surveying, its Benefits & DrawbacksNI BT
Learn the Photogrammetry Surveying and benefits-drawbacks of photogrammetry. Photogrammetry is the process of generating a 3D model from a set of 2D photographs. In Surveying, this is done by taking two or more images of the same point from different angles
Surveyors already have access to ground-based, manned flight, and satellite data, so will they embrace this new technology in earnest?
By Bill McNeil, Contributor/Advisor, and Colin Snow, CEO and Founder, Skylogic Research, LLC
The 2016 Remote Sensing Field camp will take the form of two projects.
A low tech, low cost aerial photography project using visible spectrum UAV/Ultralight Aircraft mounted cameras as the sensor to demonstrate that relatively low tech, low cost solutions can achieve surprisingly good results when compared to more commercial systems.
A more high tech, high cost terrestrial LiDAR collect of a building or structure of historical or architectural significance.
The scope of a project will influence all other aspects of the project, including its cost, timing, quality and risk.
Laser ScanningLaser scanning is an emerging data acquisition techn.pdfanjaniar7gallery
Laser Scanning
Laser scanning is an emerging data acquisition technology that has remarkably broadened its
application field and has been a serious competitor to other surveying techniques. Due to rapid
technological development, the increased accuracy of global positioning systems and improving
demands to even more accurate digital surface models, airborne laser scanning showed
significant development in the 1990s.
Somewhat later terrestrial laser scanning became a reasonable alternative method in many kinds
of applications that previously by ground based surveying or close-range photogrammetry.
1 Airborne laser scanning
Airborne laser scanning is an active remote sensing technology that is able to rapidly collect data
from huge areas. The resulted dataset can be the base of digital surface and elevation models.
Airborne laser scanning is often coupled with airborne imagery, therefore the point clouds and
images can be fused resulting enhanced quality 3D product.
The basic principle is as follows: the sensor emits a laser pulse through the terrain in a
predefined direction and receives the reflected laser beam. Knowing the speed of light, the
distance of the object can be calculated, see Figure 1.
Figure 1.: Time of flight laser range measurement [2]
Airborne LiDAR systems are composed by the following subsystems:
The components are shown in Figure 2
Figure 2.: Principle of airborne LiDAR [2]
2. Sensors, equipment
Sensors can be distinguished based on the scanning method, i.e. how the laser beam is directed
through the surface. The four most widely used sensor types are shown in Figure 4.2.3.
Figure .3: Scanning mechanisms [1]
As it is clearly seen in Figure 3, different kinds of mechanisms are applied by the different types
of sensors; each has its advantages and shortcomings, e.g. number of moving parts, type of
rotation etc. that lead to different kinds of error sources.
The capabilities (repetition rate, scan frequency, scan angle, point density) of the above scanners
are very similar; the main difference lies in the scanning pattern, as seen in Figure 4. The most
widely used oscillating mirror scanners produce the zigzag pattern. Spacing along the line
depends on the pulse rate and scanning frequency, while spacing along the flight direction
depends on the flying speed. To avoid too wide spacing of points along flight direction, LiDAR
flights are usually slower (e.g. at 60-80 m/sec) compared to that of photogrammetric flights
(even 120-160 m/sec). Careful planning of the measurement results in rather homogenous
density, however, due to technical and microelectronic reasons (regarding the operating
mechanism of the mirror, especially in case of oscillating mirrors), higher point density can be
observed at the edges of the scan swath. Previously, critics were addressed to the fixed optic
scanners, i.e. the parallel scan lines along the flight direction can miss sizeable objects, but
vendors successfully responded and modified the mechanis.
2137ad - Characters that live in Merindol and are at the center of main storiesluforfor
Kurgan is a russian expatriate that is secretly in love with Sonia Contado. Henry is a british soldier that took refuge in Merindol Colony in 2137ad. He is the lover of Sonia Contado.
Photogrammetry: Latest Technology to Create Maps Using Drones?NI BT
To know more about Photogrammetry: Latest Technology to Create Maps Using Drones and also get information of aerial photogrammetry, drone photogrammetry which can be used in Geographical informational system industries
This paper will discuss three different aspects of surveying technology, namely the types of surveying technologies available for use in a quarry environment, the types of applications the surveying technologies are used for and comparative performance of different surveying technologies in measuring stockpile volumes.
Photogrammetry Surveying, its Benefits & DrawbacksNI BT
Learn the Photogrammetry Surveying and benefits-drawbacks of photogrammetry. Photogrammetry is the process of generating a 3D model from a set of 2D photographs. In Surveying, this is done by taking two or more images of the same point from different angles
Surveyors already have access to ground-based, manned flight, and satellite data, so will they embrace this new technology in earnest?
By Bill McNeil, Contributor/Advisor, and Colin Snow, CEO and Founder, Skylogic Research, LLC
The 2016 Remote Sensing Field camp will take the form of two projects.
A low tech, low cost aerial photography project using visible spectrum UAV/Ultralight Aircraft mounted cameras as the sensor to demonstrate that relatively low tech, low cost solutions can achieve surprisingly good results when compared to more commercial systems.
A more high tech, high cost terrestrial LiDAR collect of a building or structure of historical or architectural significance.
The scope of a project will influence all other aspects of the project, including its cost, timing, quality and risk.
Laser ScanningLaser scanning is an emerging data acquisition techn.pdfanjaniar7gallery
Laser Scanning
Laser scanning is an emerging data acquisition technology that has remarkably broadened its
application field and has been a serious competitor to other surveying techniques. Due to rapid
technological development, the increased accuracy of global positioning systems and improving
demands to even more accurate digital surface models, airborne laser scanning showed
significant development in the 1990s.
Somewhat later terrestrial laser scanning became a reasonable alternative method in many kinds
of applications that previously by ground based surveying or close-range photogrammetry.
1 Airborne laser scanning
Airborne laser scanning is an active remote sensing technology that is able to rapidly collect data
from huge areas. The resulted dataset can be the base of digital surface and elevation models.
Airborne laser scanning is often coupled with airborne imagery, therefore the point clouds and
images can be fused resulting enhanced quality 3D product.
The basic principle is as follows: the sensor emits a laser pulse through the terrain in a
predefined direction and receives the reflected laser beam. Knowing the speed of light, the
distance of the object can be calculated, see Figure 1.
Figure 1.: Time of flight laser range measurement [2]
Airborne LiDAR systems are composed by the following subsystems:
The components are shown in Figure 2
Figure 2.: Principle of airborne LiDAR [2]
2. Sensors, equipment
Sensors can be distinguished based on the scanning method, i.e. how the laser beam is directed
through the surface. The four most widely used sensor types are shown in Figure 4.2.3.
Figure .3: Scanning mechanisms [1]
As it is clearly seen in Figure 3, different kinds of mechanisms are applied by the different types
of sensors; each has its advantages and shortcomings, e.g. number of moving parts, type of
rotation etc. that lead to different kinds of error sources.
The capabilities (repetition rate, scan frequency, scan angle, point density) of the above scanners
are very similar; the main difference lies in the scanning pattern, as seen in Figure 4. The most
widely used oscillating mirror scanners produce the zigzag pattern. Spacing along the line
depends on the pulse rate and scanning frequency, while spacing along the flight direction
depends on the flying speed. To avoid too wide spacing of points along flight direction, LiDAR
flights are usually slower (e.g. at 60-80 m/sec) compared to that of photogrammetric flights
(even 120-160 m/sec). Careful planning of the measurement results in rather homogenous
density, however, due to technical and microelectronic reasons (regarding the operating
mechanism of the mirror, especially in case of oscillating mirrors), higher point density can be
observed at the edges of the scan swath. Previously, critics were addressed to the fixed optic
scanners, i.e. the parallel scan lines along the flight direction can miss sizeable objects, but
vendors successfully responded and modified the mechanis.
2137ad - Characters that live in Merindol and are at the center of main storiesluforfor
Kurgan is a russian expatriate that is secretly in love with Sonia Contado. Henry is a british soldier that took refuge in Merindol Colony in 2137ad. He is the lover of Sonia Contado.
2137ad Merindol Colony Interiors where refugee try to build a seemengly norm...luforfor
This are the interiors of the Merindol Colony in 2137ad after the Climate Change Collapse and the Apocalipse Wars. Merindol is a small Colony in the Italian Alps where there are around 4000 humans. The Colony values mainly around meritocracy and selection by effort.
Hadj Ounis's most notable work is his sculpture titled "Metamorphosis." This piece showcases Ounis's mastery of form and texture, as he seamlessly combines metal and wood to create a dynamic and visually striking composition. The juxtaposition of the two materials creates a sense of tension and harmony, inviting viewers to contemplate the relationship between nature and industry.
Explore the multifaceted world of Muntadher Saleh, an Iraqi polymath renowned for his expertise in visual art, writing, design, and pharmacy. This SlideShare delves into his innovative contributions across various disciplines, showcasing his unique ability to blend traditional themes with modern aesthetics. Learn about his impactful artworks, thought-provoking literary pieces, and his vision as a Neo-Pop artist dedicated to raising awareness about Iraq's cultural heritage. Discover why Muntadher Saleh is celebrated as "The Last Polymath" and how his multidisciplinary talents continue to inspire and influence.
2. Definition
“Photogrammetry is the science of obtaining reliable information
about the properties of surfaces and objects without physical
contact with the objects, and of measuring and interpreting this
information”
is derived from the three Greek words:
phos or phot light
gramma letter or something drawn
metrein measure
3. HOW TO MAKE MAPS WITH DRONES
TYPES OF MAPS: ORTHOMOSAICS, 3D MODELS, OTHERS.
UAVs can produce a number of different types of maps:
orthorectified maps, elevation models, termal maps, and 3D
maps or models. The photogrammetry is used here.
The simplest way to create a mosaic from aerial imagery is by
using photo-stitching software, which combines a series of
overlapping aerial photographs into a single image.
An orthotmosaic is a series of overlapping aerial photographs
that have been geometrically corrected.
4. TYPES OF MAPS: ORTHOMOSAICS, 3D
MODELS, OTHERS.
3D models, which permit researchers to make volume
calculations from a set of aerial images, are increasingly
common outputs from UAV technology.
Other data products that can be made from UAV-collected
imagery include digital elevation models (DEM), NDVI
(vegetation) maps, and thermal maps, which require
specialized payloads and processing software.
5.
6. TYPES OF MAPS: NDVI MAPS
NDVI maps are made from specialized Normalized
Difference Vegetation Index (NDVI) images, which are taken
with cameras that can see in both the visual and the near-
infrared spectrum. Standard point-and-shoot cameras, such
as the Canon A490, can be modified to capture the
wavelengths required for the imagery used to create NDVI
images, considerably bringing down the cost of gathering
this data.
7. Data adquisition
• Geometric Information involves the spatial position and the
shape of objects. It is the most important information source
in photogrammetry.
• Physical Information refers to properties of electromagnetic
radiation, e.g., radiant energy, wavelength, and polarization.
• Semantic Information is related to the meaning of an image.
It is usually obtained by interpreting the recorded data.
• Temporal Information is related to the change of an object in
time, usually obtained by comparing several images which
were recorded at different times.
13. TYPES OF MAPS: THERMAL MAPS.
Thermal maps image the temperatures of a given mapping area,
and are useful for applications such as detecting structural
damage to roads, identifying the source of groundwater
discharge, spotting hidden archaeological ruins, and detecting
roe deer fawns. Specialized thermal imaging cameras, such as
those made by FLIR are light enough to be mounted on a UAV
and are increasingly being adopted by civilian pilots interested
in gathering thermal imagery.
17. FLIGHT PLANNING FOR IMAGE QUALITY
Resolution in aerial photography is measured as ground sampling
distance (GSD)—the length on the ground corresponding to the
side of one pixel in the image, or the distance between pixel
centers measured on the ground (these are equivalent). GSD is
also affected by the camera’s focal length, as well as its pixel
size. The larger pixel size means the sensor will be more
sensitive, allowing for a faster shutter speed in given light
conditions and better image quality generally.
18. Canon S100 lens, zoomed out, has a
focal length of 5.2 mm (26 mm zoomed
in). So if we wanted, say, to be able to
resolve 1 cm-sized features on the
ground using a zoomed-out S100, we
would have to fly at
1 cm x 5.2 mm / 0.0019 mm = 27.3 m =
89.7 feet
19. SENSORS
Most cameras used for UAV mapping are lightweight and can be
programmed to shoot pictures at regular intervals or controlled
remotely. Some specialized devices that can be mounted on a
UAV include LiDAR (light detection and ranging) sensors,
infrarred cameras equipped for thermal imaging, and air-
sampling sensors.
Cameras with wide-angle lenses, like the GoPro, are very
popular for video and photography uses. However, these lenses
create distortion that isn’t ideal for mapping work and has to be
edited out in post-processing, meaning they’re not well suited
to this kind of project.
20. SENSORS
The internal GPS functionality of Canon’s lightweight S100 and
SX260 models makes them particularly popular for UAV
mapping. They can be used with the Canon Hack Development
Kit, which can program the camera to take pictures at a certain
interval or to take a picture based on distance or upon
encountering a certain waypoint .
Gimbals are also used for changing the angle of the camera
from vertical (straight down) to oblique. Some mappers do not
use gimbals at all or construct their own from other
components.
22. VIEWS
The two aerial views most commonly used in UAV mapping are
known as nadir (overhead) and oblique.
Photos taken from these two different angles can be combined
in photogrammetry software (such as Agisoft Metashape,
UASMaster or Pix4Dmapper)
23. Software for UAS / Photogrammetry
Tomado de https://geoinnova.org/blog-territorio/comparativa-de-programas-para-fotogrametria/
29. GPS AND GEOREFERENCING
Some digital cameras, such as the Canon S100, come with the
ability to track the GPS location of where each image was
captured, producing data that can then be used to georeference
the image with processing software.
Some UAVs use direct georeferencing techniques that do not
require the use of ground control points, including specialized
mapping UAVs such as the MAVinci SIRIUS Pro and the SenseFly
eBee RTK model. Real Time Kinematic (RTK) satellite navigation is
a positioning technique capable of producing survey-grade
accurate results down to the centimeter level by measuring the
phase of the radio wave sent by GPS satellites.
30. GROUND CONTROL POINTS
A ground control point, as previously mentioned, is a target in
the desired mapping area with known coordinates, which can be
used to find the coordinates of other locations on the map.
33. REFERENCIAS
• T. Schenk, 2005. Introduction to Photogrammetry. Department
of Civil and Environmental Engineering and Geodetic Science.
The Ohio State University.