What are the meanings of "heading inclination", "lateral inclination" and "photo rotation angle" in photogrammetry?

1, heading inclination, which is the included angle between the projection of shooting direction on uw axis plane and W axis; ?

2. The lateral tilt angle is the included angle between the shooting direction and its projection on uw plane; ?

3. The photo rotation angle is the angle between the intersection line of the plane on the photo and the Y axis on the photo.

It is customary in our country that the clockwise angle is positive and the counterclockwise angle is positive.

Key points of photogrammetry knowledge:

1, what is the photographic scale? What's the altitude? How to determine the height when you know the photographic scale and camera type?

Photographic scale refers to the photo scale of aerial photography scheme design. Flying height is the height of the photographic plane relative to a horizontal plane at the moment of photography. When knowing the camera type = knowing the camera main distance f, use H=f? M, m is the denominator of the photo scale.

2. What is the photo tendency? What are the requirements for its size?

The angle between the shooting direction and the vertical light is called the tilt angle of the photo.

3. What are heading overlap and lateral overlap? What requirements?

The overlapping part of two adjacent photos on the ground along the flight direction of the route is called heading overlap. & gt60% ? The overlapping part of two adjacent aerial photographs on the ground is called lateral overlap. & gt thirty percent

4. What is the main optical axis? Like some?

Starting from the photography center, the vertical line of the image plane P intersects with the point O, that is, the main optical axis, and its focal length is f, and O is the main point of the image. (image principal point: the intersection of the main optical axis of the aerial camera and the image plane is called the photo principal point. )

5. How to establish the auxiliary coordinate system of image plane, image space and image space?

① Image plane coordinate system: used to indicate the position of an image point on the image plane. Taking the main point of the image as the coordinate origin, the right-handed coordinate system is adopted. The direction of the xy axis is determined as required (xy parallel to the frame coordinates).

② Image space coordinate system: taking the projection center S as the coordinate origin, the X and Y axes are parallel to the selected X and Y axes on the image plane, and the Z axis coincides with the photographing direction, forming the right-hand rectangular coordinate system S-xyz in the image space.

③ auxiliary coordinate system of image space: take the projection center S as the coordinate origin, and the xy axis is parallel to the ground xy. (Function: unified in-band coordinate system, too much)

6. What is the difference between image space and image space auxiliary coordinate system?

The origin is the center of photography; The xy axis direction of the former is parallel to the xy axis on the image plane, and the xy axis of the latter is parallel to the xy axis of the ground; The former is obtained by the latter rotating three times, and all belong to the right-handed coordinate system.

7. What are the differences and connections between photogrammetry coordinate system and ground photogrammetry coordinate system?

The coordinate system of the former is consistent with the image space coordinate system, and the coordinate origin is any point on the ground; The coordinate system of the latter is basically the same as the auxiliary coordinate system of the image space, with the X axis horizontal and the Z axis vertical, and the coordinate origin as the control point.

8. Internal orientation elements? Including those? What role?

The data that determines the relative position of the rear node of the objective lens and the image plane is called the internal orientation element, which includes the main distance f of the image and the coordinates of the main point o of the image in the frame coordinate system of the image. Function: Using it, you can get exactly the same beam as in photography, which is the basis of stereo mapping.

9. What is an external directional element? What is included?

The data that determines the spatial position of the camera or photo at the moment of photography, that is, the spatial position of the photographic beam, is called the external orientation element of the photo; Each photo has six external orientation elements: three line elements: the coordinates of the projection center S in the selected rectangular coordinate system; Three angle elements: heading inclination; Lateral inclination; Photo rotation angle. (Function: Describe the posture of the image plane space).

10, what is the principal axis?

The invariant axis around which the photo rotates by a first angle is called the first axis.

1 1、 ? Name? Geometric meaning and determination of symbols.

Indicates the heading inclination, which is the included angle between the projection of the shooting direction on the uw axis plane and the W axis; Represents the lateral tilt angle, which is the included angle between the shooting direction and its projection on uw plane; Represents the rotation angle of the photo, and Svo is the angle between the intersection line of the plane on the photo and the Y axis on the photo. It is customary in our country to stipulate that the angle is positive clockwise and positive counterclockwise.

12. Why do you often convert the image space coordinate system into the space auxiliary coordinate system in photogrammetry?

The image space coordinate system is obtained from the image space auxiliary coordinate system after three rotations. The auxiliary coordinate system of the image side is a transitional coordinate system, which can make the object contact with the image side, from seven parameters to three parameters, simplifying the calculation.

13. Given the image space coordinate system of three corner elements, how to calculate the coordinates in the image space auxiliary coordinate system?

From these three angle elements, the rotation matrix r can be calculated according to the rotation angle system, so the coordinates in the image space coordinate system can be converted into the coordinates in the image space auxiliary coordinate system by multiplying the rotation matrix.

Positive and inverse solutions of 14, * * * linear equation?

Positive solution form: left image square, right object square;

Inverse solution forms: left object square, right image square.

reference data

Photogrammetry. Douban [citation time 2018-1-18]