topic geometryEngine.geodesicBuffer gives error "not implemented" when creating buffer for a layer in Web AppBuilder Custom Widgets Questions

geometryEngine.geodesicBuffer gives error "not implemented" when creating buffer for a layer

MichaelLev — Thu, 11 Mar 2021 16:07:18 GMT

in my code I do:

var buffers = geometryEngine.geodesicBuffer(
geometries, // geometries
[bufferDistance], // distance
"meters", // unit
true // unionResults into SINGLE polygon
);

But suddenly, for new layers, I get error msg "Not Implemented".

What in the layer(s) can cause such an error?

Re: geometryEngine.geodesicBuffer gives error "not implemented" when creating buffer for a layer

MichaelLev — Wed, 10 Mar 2021 14:36:01 GMT

Dear Robert,

can you help please?

Re: geometryEngine.geodesicBuffer gives error "not implemented" when creating buffer for a layer

MichaelLev — Thu, 11 Mar 2021 15:42:34 GMT

From my trials I understand that

if the layer spatial reference is 102100 (that is 3857 WGS 1984 Web Mercator) then from its geometries then I can create a buffer, by the code above,

but

if the layer spatial reference is wkid:2039 (Israel TM Grid) then when I try to create a buffer from its geometries by the code above, I get the error mentioned above.

So, what should I do? I need to create a buffer, and I need spatial reference = wkid:2039 (Israel TM Grid) in order that the automatic computed area for polygons will be correct.

Help will be gereatly appreciated!

Michael

Re: geometryEngine.geodesicBuffer gives error "not implemented" when creating buffer for a layer

Maarten-de-Rijk — Thu, 01 Jul 2021 08:58:43 GMT

Hi Michael,

I was having a similar problem. My solution was to use buffer() instead of geodesicBuffer().

From the documentation:

The GeometryEngine has two methods for buffering geometries client-side: buffer and geodesicBuffer. Use caution when deciding which method to use. As a general rule, use geodesicBuffer if the input geometries have a spatial reference of either WGS84 (wkid: 4326) or Web Mercator. Only use buffer (this method) when attempting to buffer geometries with a projected coordinate system other than Web Mercator.

This worked for me:

const point = new Point({ type: "point", x: 187043, y: 333702, spatialReference: { wkid: 28992 } }); let buffer = geometryEngine.buffer(point, 100, "meters");