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Densifiy a Circle

MKa

I cannot get any of the density functions to work correctly on a true circle. I simple want to draw a circle using the Circle create feature tool, then turn that circle into many points. I want to do this, because i have found that when clipping and getting the difference of two circles, it works better if they are densified. The problem is, is that everytime I try any of the 4 densify functions in Pro SDK, the circles turn into Oblong ovals. I need them to preserve their circular shape, but have many vertices.

In ArcObjects I simply did this

newPolygon<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Densify</SPAN><SPAN class="punctuation token">(</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="number token">0001</SPAN><SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">.</SPAN><SPAN class="number token">0001</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN></SPAN>

But in ArcGIS Pro, i cant get anything to work quite like that? They all turn into ovals, not the true circle

densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">GeodeticDensifyByDeviation</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="number token">0001</SPAN><SPAN class="punctuation token">,</SPAN>LinearUnit<SPAN class="punctuation token">.</SPAN>Feet<SPAN class="punctuation token">,</SPAN>GeodeticCurveType<SPAN class="punctuation token">.</SPAN>Geodesic<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">DensifyByLength</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">.</SPAN><SPAN class="number token">01</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">DensifyByDeviation</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN> <SPAN class="punctuation token">.</SPAN><SPAN class="number token">0001</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

etc<SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN><SPAN class="punctuation token">.</SPAN>

‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍<SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

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Accepted answers

MKa

Thank you for all of your help. I think I have the solution now. It was a combination of my projection before and after the densify was executed. Additionally, using 1m distance was more than sufficient for my needs. I projected my item to WebMercator, then densified, then projected back to my original Spatial Reference. I need to still check that the shape was correctly preserved, but this seemed to do the trick

SpatialReference previousSR <SPAN class="operator token">=</SPAN> densifyPolygon<SPAN class="punctuation token">.</SPAN>SpatialReference<SPAN class="punctuation token">;</SPAN>

<SPAN class="comment token">//Need to get to WebMercator in order to get the circle the same</SPAN>
densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Project</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN> SpatialReferences<SPAN class="punctuation token">.</SPAN>WebMercator<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">DensifyByLength</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN> <SPAN class="number token">1</SPAN><SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>
densifyPolygon <SPAN class="operator token">=</SPAN> GeometryEngine<SPAN class="punctuation token">.</SPAN>Instance<SPAN class="punctuation token">.</SPAN><SPAN class="token function">Project</SPAN><SPAN class="punctuation token">(</SPAN>densifyPolygon<SPAN class="punctuation token">,</SPAN> previousSR<SPAN class="punctuation token">)</SPAN><SPAN class="punctuation token">;</SPAN>

_dataInspector<SPAN class="punctuation token">.</SPAN>Shape <SPAN class="operator token">=</SPAN> densifyPolygon<SPAN class="punctuation token">;</SPAN><SPAN class="line-numbers-rows"><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN><SPAN>‍</SPAN></SPAN>

All comments

MKa

My users use the Circle tool from the editing tool bar to draw the circle via heads up digitizing. But I need this circle to be converted from the 2 points of a circle, to a densified circle~ of points.

My problem can be recreated by taking the circle created using the out of box circle edit tool, then in the onRowCreated event try to densify it. I always get the oblong circle or oval.

DanPatterson_Retired

a densification of 0.001 would represent 1 millimeter if your file is indeed in a utm projection... perhaps specify your densification in units appropriate to the circumference of the circle. most arc* based circles use an n-gon of 360 points to represent a circle. You can calculate your current point spacing from the circumference/360 then you can space appropriately

Now... if the file is actually in decimal degrees... project it to UTM first since guessing spacing from arc-seconds is less than desirable

MKa

These circles represent an irrigation system in an agriculture field. So around 200-400m in diameter. The projection is UTM with the meridian centered for that area where the fields are at to best preserve distance. Is there a particular projection that would be best for this that would preserve the circle during the densify procedure?

JoshuaBixby

What projection are you using and how large are these circles?

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