***Line Conditional Equation

***The line condition equation is as follows: x=a+b*t.

Extended information:

***Line equation is the mathematics that expresses the object point, image point and projection center (usually the lens center for photos) located on a straight line. The relationship is one of the most basic formulas in photogrammetry.

In the formula:

1. x, y are the image plane coordinates of the image point;

2. x0, y0, f are the internal orientation elements of the image ;

3. XS, YS, ZS are the object space coordinates of the camera point;

4. XA, YA, ZA are the object space coordinates of the object point;

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5. ai, bi, ci (i=1,2,3) are the 9 directional cosines composed of the 3 external azimuth elements of the image.

The main applications of ***line equations are:

1. Rear intersection in single image space and front intersection in multi-image space;

2. Analytical aerial triangulation The basic mathematical model in measurement beam adjustment;

3. Form the basis of digital projection;

4. Calculate simulated image data (known internal and external azimuth elements and object point coordinates of the image (Find image point coordinates);

5. Use digital elevation model (DEM) and linear equations to create orthophotos;

6. Use DEM and linear equations Perform single image mapping.

Extended information:

The word photography is derived from the Greek φ? English: phos (light) and γραφι English: graphis (painting, drawing) or γραφ? graphê, two words Together it means "drawing with light". Photography refers to the process of recording images using certain specialized equipment. Generally, we use mechanical cameras or digital cameras for photography.

Sometimes photography is also called photography, which is the process of exposing a photosensitive medium to light emitted or reflected by an object. Someone once said a pithy saying: The photographer's ability is to transform the fleeting and ordinary things in daily life into immortal visual images.

In June 2020, the National Copyright Administration issued the "Notice on Standardizing the Copyright Order of Photographic Works", which clarified the copyright issues related to photographic works. It will increase efforts to rectify copyright in the field of pictures and promote the construction of photographic works. Long-term mechanism for copyright protection.