I did the interpolation from the same map using arcgis and the turf.js library, using the same parameters and points. Could anyone say why the difference?

ArcGIS params enter image description here

ArcGIS Map enter image description here

Turf.js params

turf.interpolate(points, 20, {
  gridType: 'square',
  property: 'Ca_1',
  units: 'meters',
  weight: 1,

Turf.js Map enter image description here

  • 1
    Most likely is number of points they are using by default.
    – FelixIP
    Commented Jul 14, 2021 at 21:07

1 Answer 1


@felixIP - I agree, first check would be default number of points needed to make an estimation. In ArcMap you can assign the minimum number of samples needed to conduct the calculation. Second check would be the search radius used by the interpolant to "look" for other data. It is not clear to me in the turfs documentation for interpolation (https://turfjs.org/docs/#interpolate) if they consider search radius and minimum number of samples - two very important variables that will dictate the interpolation.

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.