# Esri x and y coordinate confusión

I am trying to figure out which coordinate system x and y are in and trying to understand the data from the Esri site.

datasource: DATA

In the data each FID represents a Polyline, the coordinate is in the geometry attribute. Sometimes the first given value (0 -> 0,1) represents the stating point of the line, and some times x0 and x1 gets inverter, the dame happend to y0 and y1.

For example:

FID: 124

``````0:{0:142239, 1:104776}
1:{0:-1345, 1:2253}
``````

The 1 represents the difference between origin and next point.

When you represent the data, it should be displayed as:

``````0:{0:142239, 1:109282}
1:{0:-1345, 1:-2253}
``````

FID: 127

``````0:{0:142239, 1:104776}
1:{0:-13221, 1:3123}
``````

The 1 represents the difference between origin and next point.

When you represent the data, it should be displayed as:

``````0:{0:140894, 1:107029}
1:{0:-13221, 1:-3123}
``````

Another thing, which coordinate system x and y are this data in? FID: 124 origin is supposed to be nearby: 18.929 -70.358 FID: 127 origin is supposed to be nearby: 18.909,-70.370

• Look at the layer metadata, at the level above, which reports "Spatial Reference: 102100 (3857)". The units in Web Mercator are nominally "meters" but actually of no particular meaning. Tiny values near the origin keep you on Null Island. Commented Feb 25, 2023 at 3:32
• And if you request geojson (`f=pgeojson`) instead of Esri json (`f=json`), you'll get lon, lat in EPSG:4326 i.sstatic.net/zahOk.png Commented Feb 25, 2023 at 7:06
• @user2856 Thanks for your help. How did you manage to organize the data? I noticed that the dataset got from the 'f=pgeojson' refered to EPSG:3857 and the data seems to be lat and lot inverter, and the decimal point misplaced. Commented Feb 26, 2023 at 19:44
• No, the data returned from that query is in EPSG:4326 not EPSG:3857. i.e. latitude and longitude (Y, X) in decimal degrees. The coordinates are reversed as that is the correct axis order for EPSG:4326 and there is no misplacement of decimal point, the coordinates are decimal degrees not metres. If you read it as GeoJSON, i.e use a library that understands GeoJSON you don't need to worry about that. Commented Feb 26, 2023 at 20:12