I am using Mapinfo and it has Y as latitude and X as longitude. Is that the same case for all mapping software? As for any country their respective value is multiple of 1 or -1. So for Nepal can I say it is on positive side +1 for both latitude and longitude? And for USA to be +1 Y and -1 X.
No, for example when talking to a GeoServer WFS (or any other compliant WFS) the axis order depends on if you ask for version 1.0 or 1.1 of the spec in EPSG:4326.
For ESRI its almost always going to be:
Lat = Y Long = X
It's easy to get backwards. I've been doing this for years but still need to think about it sometimes.
On a standard north facing map, latitude is represented by horizontal lines, which go up and down (North and South) the Y axis. Its easy to think that since they are horizontal lines, they would be on the x axis, but they are not.
So similarly, the X axis is Longitude, as the values shift left to right (East and West) along the X axis. Confusing for the same reason since on a north facing map, these lines are vertical.
I'm mildly dyslexic so I always need to pause and think about it for a brief second when displaying new x/y data. Hope this helps.
X and Y are variables that can change for different purposes. For example: You may want to know the wind-speed, and you could use a sailboat's speed to know how fast is the wind going, so we can say: the sailboat = X and wind = Y. But it could also be that, you don't know how fast is the boat going and you can find its speed by knowing the wind-speed so now wind = X and sailboat = Y. However: The Equator, Prime meridian (at Greenwich), North and South, and Latitude and Longitude don't change. From the Equator to the North pole we measure Latitude 0° to 90° respectively, from the Equator to the South pole we measure 0° to -90° respectively. From the prime meridian at 0° we measure West up to -180° and East up to 180°. Sometimes -+ are replaced with West and East so that: -81° and 81°W mean the same thing. ESRI corporation regularly use X as longitude and Y as latitude.
The reason behind is:
If you place x and y axis on earth, Latitude will cut across y axis and Longitude will cut across x axis. Hence, Latitude is y and Longitude is x.
protected by Community♦ Oct 12 '16 at 17:43
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