topic Re: Reprojecting circle features in Data Management Questions

Reprojecting circle features

BrianKneller — Tue, 19 Mar 2019 14:28:19 GMT

I have created a simple circle feature and tried to reproject it onto an equidistant cylindrical projection which I am using. I created the circle in a dataframe with this projection and it does not compensate for the spatial distortions towards the poles. I have used the feature class reprojection tool under data management. I was expecting the rendering of the circle to be corrected for these distortions. I am using ArcGIS 10.5. I must have missed something obvious, a suggestion would be welcome. Thank you

Re: Reprojecting circle features

DanPatterson_Retired — Tue, 19 Mar 2019 17:25:44 GMT

do you have a screen grab ? and what longitudinal bands do you need to do this for?

I am thinking Tissot's indicatrix - Wikipedia and whether you need the circles to be of the same size or just shape (see images for global data in the link)

Re: Reprojecting circle features

MelitaKennedy — Tue, 19 Mar 2019 20:11:09 GMT

Circle features are maintained as circles, assuming that you're more interesting in keeping the feature as a circle. That viewpoint is coming from street/parcel design.

To get it to reflect the distortions in a projection, you will have to convert it to a polygon by densifying it.

Melita

Re: Reprojecting circle features

BrianKneller — Fri, 22 Mar 2019 12:24:58 GMT

Dan please find a screen shot attached, you can see the spatial distortion in the crater outline which are usually circular or thereabouts. Melita I have tried what you suggested and could not get it to work, the function failed with a warning 000117.

Re: Reprojecting circle features

MelitaKennedy — Fri, 22 Mar 2019 18:40:43 GMT

Which tool?

Re: Reprojecting circle features

BrianKneller — Sun, 24 Mar 2019 10:56:42 GMT

Sorry for the omission I used the Geodetic Densifying tool