2 edition of photogrammetric technique for microslope analysis. found in the catalog.
photogrammetric technique for microslope analysis.
John Burns Anderson
1968 in [Toronto] .
Written in English
|Other titles||Toronto. University. Theses (B.A.)|
|LC Classifications||LE3 T62 A55|
|The Physical Object|
|Number of Pages||89|
Scale Requirements only needed if accurate scaling is needed a. If the AutoBar has been removed, you will usually need to design some sort of fixture that allows you to return the AutoBar to its original location. Each code is made up of a unique pattern of squares and a central dot. Planning the Measurement Proper planning is essential for making a successful measurement.
If no approximate coordinates are available, you can use the AutoBar provided with the system to do an initial measurement. Thus, the target and object exposure are largely independent with target exposure provided by the strobe, and object exposure provided by the ambient light. Spherical hard-body targets are also available. Typically, this local system is not usually the final coordinate system desired by the user. For larger distances, a larger AutoBar can be used.
Attaching the Scale Bar s Scale bar s provide precise distance information so the measurement can be scaled correctly. Even if you are not measuring the top of the box, you may find it very useful to add targets here since these may very well be seen from many different locations around the box. Often, the user coordinate system is defined by a subset of the measured points that have coordinates in the user's desired coordinate system. If a point of interest cannot be seen directly, often some form of offset target can be devised to measure the point indirectly.
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If no approximate coordinates are available, you can use the AutoBar provided with the system to do an initial measurement. Another approach is to put targets on the edge or top of the panel that can be seen from both sides. After this we discuss the general procedures for the different types of measurements.
Often, the user coordinate system is defined by a subset of the measured points that have coordinates in the user's desired coordinate system. To help understand the process we describe below design strategies for some typical types of partially overlapping measurements.
However, since the back and front of the target are not the same point they are separated by the thickness of the two target surfaces which is about 0. Remember, just a line of common points is not sufficient. These are precisely made target carriers designed to be mounted in a precision bushing so they can be rotated.
However, the difficulty comes when we try to connect the front and back together. Placing a line through the target with a red marker is one way of signalizing a target that is bad.
This material is especially useful for measuring surfaces since it is much faster to apply and remove than individual targets.
Need at least twenty well-distributed points in the entire measurement but forty is better. In addition, your plan must consider blockage. First, we can take more photographs in the middle that are aimed right at the center of the wall. Keep it in mind if you ever face a similar situation.
Need two different sightings of every point prefer four as a minimum. Self-Calibration Requirements a. Taking more pictures can increase photogrammetric accuracy significantly. After you have a good design for each side, we can turn our efforts to tying all the sides together.
In other examples they have small black dots in the center so theodolites can measure them as well. You can then turn these to face the camera as you go around the box.
On other projects, you will take and measure some pictures, and then process them to get preliminary results so you can make measuring the remaining pictures easier. For example, on some projects, you will take all pictures first to minimize time on-site typically and then measure them, while on others you will measure each picture after it is taken.
Design for "Box" Measurements A common situation that requires partially overlapping measurement occurs when you must measure an object that has multiple sides. Masked targets can also have alignment marks added to the edges so the center of the target can be precisely aligned with scribe lines.
Finally, you can try measurements of more complicated objects. Visually inspect targets before use for any dirt, dust or damage.
Whenever possible, the AutoBar should be placed so it is easy to see and not blocked by the object. A low-power flash located at the camera is used to illuminate the targets.A DIGITAL CLOSE-RANGE PHOTOGRAMMETRIC TECHNIQUE FOR MONITORING SLOPE DISPLACEMENTS Efstratios Stylianidis, Petros Patias, Vassilios Tsioukas, Lazaros Sechidis and Charalambos Georgiadis Aristotle University of Thessaloniki, Department of Cadastre, Photogrammetry & Cartography University BoxGR Thessaloniki, Greece Abstract.
position may be a useful analytic technique in a variety of marine mammal inves-tigations. Using data collected from the Weddell seal (Leptonychotes weddellii), we describe the method of body form characterization using elliptical Fourier analysis and demonstrated usefulness of the technique in photogrammetric mass-estimation.
The analysis demonstrated that the relative positions and azimuths of frames and differed only slightly from those found with the Pan photos included in the full photogrammetric analysis. The differences are well within the range of expected errors and are not shown.
A photogrammetric approach for stability analysis of weathered rock slopes Photogrammetric methods based on 3D surface models are used to obtain reliable data on the joint sets in rock slopes, instead of general site investigation using labor-intensive techniques.
Photogrammetric surveys were conducted on weathered rock slopes in Gold Coast. a digital close-range photogrammetric technique for monitoring slope displacements Article (PDF Available) · January with Reads How we measure 'reads'.
High Accuracy Deformation Monitoring of a Concrete Beam using Automatic Photogrammetric Techniques FIG Working Week Knowing to manage the territory, protect the environment, evaluate the cultural heritage Rome, Italy, May 4/16 alternative video recording may be used by two synchronized video camcorders.