2. Latitude and longitude positioning query
How can I know my current latitude and longitude?
You can directly use Google Earth to check your latitude and longitude.
Latitude and longitude are the combined names of longitude and latitude, which form a coordinate system. Longitude is the degree of a place on the earth from the north-south line called the prime meridian to the east or west.
Latitude refers to the line-plane angle between a point and the center of the earth and the equatorial plane of the earth, and its value is between 0 and 90 degrees. Latitude and longitude are the combined names of longitude and latitude, which form a coordinate system.
Also known as geographic coordinate system. It is a spherical coordinate system that uses the spherical surface of three-dimensional space to define the space on the earth, and can mark any position on the earth.
Each degree of latitude is approximately equivalent to 1 1km, but the distance of each degree of longitude varies from 0km to11km. Its distance varies with latitude and is equal to 1 1 1km multiplied by the cosine of latitude.
However, this distance is not the shortest distance between two points separated by a longitude. The shortest distance is the distance of the arc connecting the great circle between these two points, which is smaller than the distance calculated above. The longitude of a place generally corresponds to the time difference between it and Coordinated Universal Time: there are 24 hours in a day and a circle has 360 degrees, so the earth rotates 15 degrees every hour.
So if a person's local time is 3 hours earlier than UTC, then he is about 45 degrees east longitude. However, due to political factors in time zone division, a person's time zone may not be consistent with the above calculation.
But by measuring the local time, a person can calculate the longitude of his place. In order to calculate this data, he needs a clock indicating Coordinated Universal Time, and needs to observe the time when the sun passes through meridian circle.
How to locate Baidu map to get the current latitude and longitude?
Open Baidu Map "Coordinate Picking System"
After entering the "coordinate retrieval system", you can easily query your precise geographic information. We take "Haier Industrial Park" as an example to find its detailed coordinates.
Enter "Haier Industrial Park" in the search field, and click Search, as shown in the figure, and the corresponding mark will appear on the map. Click on what you are looking for, and you will see the corresponding coordinates, as shown in the figure.
Method for accurately positioning latitude and longitude coordinates by using Baidu map
Similarly, we enter the found coordinates into the search bar, check the "coordinate reverse query" at the back, and click search, and the corresponding coordinates will be marked, and the corresponding address is on the far right.
Method for accurately positioning latitude and longitude coordinates by using Baidu map
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Also, when you slide the mouse on the map, you can see that the corresponding coordinates will be displayed wherever the mouse slides.
Latitude and longitude query positioning system
Latitude and longitude query steps
(a) Baidu "latitude and longitude query", choose the first one.
(2) Open the query page
(3) Enter the name of the query place, such as Beijing.
How to get the latitude and longitude of the current position through Gaode map
Gaode map does not support latitude and longitude query.
In the upper right corner of Baidu map, click "Map API".
On the map API page, move the mouse to the Tools menu item and select Coordinate Picking Tool from the drop-down menu.
For example, enter "baidu edifice" in the search bar, click Search, and the corresponding mark will appear on the map. Click on what you are looking for, and you will see the corresponding coordinates.
Similarly, enter the found coordinates into the search bar, check "Coordinate Reverse Query" at the back, and click Search, and the corresponding coordinates will be marked, and the right side is the corresponding address.
At the same time, slide the mouse on the map, you can see that the mouse slides to every place, and the coordinates will be displayed accordingly.
How to find latitude and longitude
After entering Google Maps, you can see Google Maps Lab in the upper right corner. Click to enter, as shown in the figure below:
Then you will see the following interface, drop down the window scroll bar, as shown by the arrow:
After the drop-down, you will see the latitude and longitude mark, and the display is disabled.
We need to disable and enable it, and then save the changes, as shown in the following figure:
After setting up, you can check your location on Google Maps.
Put the mouse where you want to find it, and right-click it to show the following figure. Choose to place latitude and longitude marks, and click to enter:
Finally, when you put the mouse in the place you choose, it will automatically display the local accurate latitude and longitude, as shown in the figure:
I hope it will help everyone.
How to locate Baidu map to get the current latitude and longitude?
To set the proxy
self . mapview . delegate = self；
[self.mapview setshowsuserlocation: Yes];
So you can listen to it in-(void) mapviewdidstocataloger: (bmkmapview *) mapview {} when you watch it later.
Such as moving to the current position:
After positioning, move to the current position.
-(void)mapView:(BMKMapView *)mapView didUpdateUserLocation:(BMKUserLocation *)user location {
CLLocationCoordinate2Dcoor
coor . latitude = self . mapview . user location . coordinate . latitude；
coor . longitude = self . mapview . user location . coordinate . longitude；
[self . mapviewsetcentercoordinate:coor animated:YES]；
}
How to calculate latitude and longitude
To put it simply, the latitude is horizontal, the longitude is vertical, the latitude is a whole circle, the longitude is a semicircle, the middle of the latitude is small and the two sides are large, and the longitude starts from Greenwich, England, and gradually increases in the east, east and west.
The details are longitude and latitude.
Longitude and latitude are both angles. Longitude is dihedral angle, that is, the angle between two meridian planes. Because all meridians are the same length, choose a starting point to measure longitude. After the negotiation of 1884 international conference, it was decided that the starting meridian was the meridian passing through a main meridian instrument cross at the Royal Greenwich Observatory on the south bank of Thames in London, England. The prime meridian plane is the starting point plane and the ending point plane is the local meridian plane. The longitude of a point is the angle between the meridian plane where the point is located and the prime meridian plane. Measured on the equator, from the prime meridian plane as the starting point plane, measured to the east and west respectively. The east value is called east longitude and the west value is called west longitude. It can be seen that the longitude of a place is its direction and angular distance from the prime meridian. The prime meridian is zero longitude, the maximum longitude is east longitude 180, the maximum longitude is west longitude 180, and the longitude of east longitude 180 is the same meridian, so both east longitude and west longitude are called 180 longitude.
Latitude is the line angle. The starting point plane is the equatorial plane and the straight line is the local ground normal. The so-called normal is a straight line perpendicular to the reference oblate sphere. The latitude of a place is the angle between the normal and the equatorial plane. Latitude is on the local meridian.
Latitude and longitude positioning query Latitude and longitude query positioning system
Latitude and longitude query steps
(a) Baidu "latitude and longitude query", choose the first one.
(2) Open the query page
(3) Enter the name of the query place, such as Beijing.
Latitude and longitude query
Knowing the latitude and longitude can locate this place on the map, which is very easy to operate. At present, Google Maps and Google Earth can be realized.
Google Maps, Google Earth
Methods/steps
Generally, the latitude and longitude measured by mobile phone or GPS are in the front and the latitude is in the back. When using map search, latitude comes first and longitude comes last.
Open Google Maps and enter the latitude and longitude in the search box, separated by English ",". Click search. come here
Latitude and longitude: for example, 3 1. 19243, 12 1.54044. The result is shown in the figure. But the positioning of Google Maps is not very accurate.
The most accurate method is to use Google Earth software. Open Google Earth and enter the latitude and longitude at the icon position in the upper left corner. Pay attention to the need to ensure normal network connection.
After clicking search, Google Earth will slowly enter the actual location of latitude and longitude. This position is very accurate, unless your latitude and longitude itself is biased.