Why add a constant of 50000 to the horizontal axis?

Considering that the vast western region can also participate in the fact that it is a kind of care, if you do not add 50,000, the abscissa will inevitably have a negative value after going to the point code, so it is possible to reduce the code by one bit without going to the code, and it will be chaotic!

You wrote one less 0The purpose of adding 500 km is to not have a negative value in the y-coordinate.

The purpose of adding 500 kilometers to the positive solution upstairs is to not have a negative value in the y coordinates.

China's longitude range from 73° in the west to 135° in the east, can be divided into 11 6-degree projection zones, that is, the 13th 23rd zone.

In the 2000 national geodetic coordinate system, the maximum length of half of the zone is about =.

On the projection surface, the projection of the ** meridian is the x-axis of the ordinate, and the projection of the equator is the y-axis of the abscissa.

In our country the x-coordinates are all positive, and the maximum value of the y-coordinates (on the equator) is about 330km. In order to avoid negative abscissa for y, add 500 km to the abscissa. In addition, the coordinates should be preceded by a band. Such coordinates are called national uniform coordinates.

This is why, in RTK measurements, the Y-coordinate plus constant increases by 500,000 m when entering the projection parameters.

Hehe, the basic things of surveying, the explanation upstairs is detailed enough.

In order to control the projection deformation, it is divided into 3 degree zones and 6 degree zone projections, in which the left y of the projection line is a negative value, in order to avoid negative numbers, 500km is added to become a positive number.

The coordinate system used for the measurement is the same as the mathematical coordinate system, where x and y are reversed.

We use the NE coordinate system, and the horizontal axis is the y-direction, also known as the east-east direction (e);

The longitudinal axis is in the x-direction, also known as the north direction (n).

1) The abscissa of an intersection point is 2, and substituting x=2 into the proportional analytic formula: y=2k, and substituting the inverse proportional analytic formula gets: y=5?k

Eliminate y to get: 2k=5?k

solution: k=1, then the analytic formulas of the two functions are y=x and y=4x2 respectively) The analytic formulas of the two functions are conjoined as:

y xy y 4x solution:

x＝2y＝2

Or. x＝?2

y＝?2, then the two intersection points are (2,2) and (-2,-2), respectively;

3) When x1x2

0, y1y2

When x10 x2

, y1y2

When 0 x1x2

, y1y2

In general, they are evenly distributed.

Ahh If the distribution needs to be adjusted, double-click on the horizontal axis.

The topographic map of our country adopts the Gaussian Krüger planar Cartesian coordinate system. In this coordinate system, the horizontal axis: equator, denoted by y; Longitudinal axis:

**Warp, denoted by x; Coordinate origin: The intersection of the meridian and the equator, denoted by O. South of the equator is negative, north is positive; **The east of the meridian is positive and the west is negative.

China is located in the northern hemisphere, so the ordinate is positive, but in order to avoid the negative value west of the longitude line, the longitudinal axis of the coordinates is shifted westward by 500 kilometers (500,000 meters). The so-called "abscissa constant" means that the origin of the ordinate axis is "translated 500 km to the west".

A normal distribution with a constant is still in line with the normal distribution, but the expected value is added with this constant.

n(0,σ²c ~ n(c,σ²

If a random variable conforms to a normal distribution, we can draw an image of its function and add a constant to each of its numbers, which will only make the function image shift left and right, then it will only change the expected value, and it will still conform to the normal distribution, and even the standard deviation will not change.

Finding the double integral for a constant is a constant multiple of the area of the region. This area is the total area of the integral area, and there is no need to subtract the negative area from the positive area.