I've been using the JS 3.27 api buffer tool:
https://developers.arcgis.com/javascript/3/jssamples/util_buffergraphic.html
I've got it working in my custom map, but the buffer sizes are wrong. For example, I've done a buffer of 1600 metres, but when I measure it, it is about 1900 metres. It's not the measure tool, because I've buffered some grid roads, the distances of which are 1600 metres apart, so when I buffer a line in the middle, it goes over by about 150m on each side
I've measured other buffers and they are wrong too, by about 20%.
Have a look at my attachment, it shows two grid roads (north-south), 1,600 metres apart. The buffer was supposed to be 1,600 metres wide, but when measured it is around ,1900 metres.
