I drew some lines in a GIS application in this projection: +proj=longlat+ellps=WGS84 +datum=WGS84 - is there a name for this projection?

I imported my lines into R and to prepare for calculating distance between points on my lines, I projected my lines using: +proj=laea +lat_0=52 +lon_0=10 +x_0=4321000 +y_0=3210000 +ellps=GRS80 +towgs84=0,0,0,0,0,0,0 +units=m +no_defs - again, is there a name for this projection?

To actually calculate distances between points on my lines, I used the gLength function in the R package rgeos. What sort of distance calculation does gLength use?

1 Answer 1


+proj=longlat +datum=WGS84 is a coordinate reference system (crs). If you would create a map with that, by treating longitude as 'x' and latitude as 'y', you could call it the equirectangular projection.

+proj=laea stand for "Lambert Equal Area". This is planar (Cartesian) crs (unlike angular longlat), and can be used with rgeos::gLenght. gLength computes the shortest distance, between points along the line.

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.