Finding the percentage of coverage that a layer covers a polygon

Dan_Weaver · October 25, 2018, 2:16pm

I have a user drawn polygon on the map that is being held in an InMemoryFeatureLayer. I also have a layer loaded containing various polygonshapes. What I’m trying to do is determine how much of the layer’s polygons are overlapping with the user drawn polygon and get a %.

There’s the long way of doing this by counting pixels and such, but I was hoping there was a tool in MapSuite that will help with this.

I know you can get the area of a shape, but is there a way to get the area of all the shapes within a layer? That might help with this.

Let me try to show an example:

The black hexagon is a user drawn polygon.
The red shapes are from a single layer (shapefilelayer or personalgeodatabase).
I want to find what percent the red shapes WITHIN the black user drawn polygon cover the user drawn polygon. So half of the red polygon on the left side would not be counted in the calculation since it isn’t in the black hexagon.
In this case the result might be around 50% or so just looking at it.

Ethan · October 26, 2018, 5:19am

Hi Dan,

Please write a function for that, in the logic you can loop your red polygons.

If the polygon is out of black one, just ignore it.
If it’s contained by black one, just save it’s area value.
If they are intersect, use the API for example Different to get the redundant area, just minus it. For example:

Wish that’s helpful.

Regards,

Ethan

Dan_Weaver · October 26, 2018, 4:29pm

So upon doing the .GetDifference() function, I receive the following error:

NetTopologySuite.Geometries.TopologyException: ‘found non-noded intersection between LINESTRING(-7876991.7922414318 5325298.295923247, -7876990.8093172209 5325297.7621183572) and LINESTRING(-7876990.7206208259 5325298.48704141, -7877103.4217566978 5325130.8619913682) [ (-7876991.1013756851, 5325297.9207289955, NaN) ]’

It’s doing it for all polygons in the layer I try the .GetDifference() on.

Here’s the polygon that I want to see the coverage of: {POLYGON((-7877448.29829595 5324740.51763905,-7876028.63364608 5326029.2912219,-7877105.967813 5326250.79918145,-7878193.37052354 5325344.63025601,-7877448.29829595 5324740.51763905))}

Here’s the polygonshape
{POLYGON((-7877731.13322687 5326435.24404656,-7877728.12455957 5326432.80810549,-7877715.06571897 5326421.71426822,-7877707.29751201 5326414.1799989,-7877700.46418759 5326406.88622082,-7877694.97808909 5326400.63313546,-7877690.07148653 5326395.08303144,-7877685.13452432 5326389.58100731,-7877679.08698649 5326382.65584006,-7877671.58723328 5326373.8024913,-7877663.29744665 5326362.90343487,-7877655.20065348 5326350.13532052,-7877648.49391143 5326337.32374974,-7877643.65901759 5326326.22222194,-7877640.54174649 5326317.98495092,-7877638.47946384 5326312.69251466,-7877637.02461236 5326309.41766151,-7877635.93699004 5326307.36492091,-7877635.03741436 5326305.89378408,-7877634.37552356 5326304.92447239,-7877634.1818622 5326304.75994379,-7877633.90649558 5326304.63083217,-7877633.16147015 5326303.94390602,-7877631.30797353 5326301.95562846,-7877628.59563059 5326298.9646886,-7877624.75405624 5326294.57147031,-7877620.04257439 5326289.20290238,-7877605.1368801 5326269.89755827,-7877600.72956406 5326263.44505996,-7877596.59736954 5326256.97601231,-7877592.97477853 5326250.99768363,-7877589.84598632 5326245.64185307,-7877587.04980277 5326240.78367801,-7877584.82215966 5326236.78819166,-7877582.4515387 5326232.58101676,-7877580.16105838 5326228.74611572,-7877578.28643227 5326225.38432161,-7877576.32672119 5326221.981505,-7877572.12853361 5326215.38568959,-7877562.83082771 5326202.40964065,-7877560.14258625 5326198.91109735,-7877555.74106681 5326193.43921627,-7877544.40401567 5326178.41350935,-7877538.73438683 5326169.87808683,-7877533.84941206 5326161.93214106,-7877530.16352417 5326155.54169162,-7877526.86733974 5326149.7548119,-7877523.57806898 5326144.27054778,-7877520.17304077 5326138.61423772,-7877516.49437242 5326132.29805113,-7877512.51199748 5326125.38795389,-7877508.67119126 5326118.67777405,-7877504.8616192 5326111.6982379,-7877500.99135573 5326104.53864453,-7877497.53453541 5326097.93552399,-7877494.48655939 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5325994.25578219,-7877671.29144951 5326001.00961725,-7877674.30420132 5326007.07394235,-7877677.03179715 5326012.49663293,-7877679.46963815 5326017.19348725,-7877682.03001474 5326021.98571631,-7877684.8065338 5326026.79324098,-7877687.50332831 5326031.40085771,-7877690.56567358 5326036.51769735,-7877693.90165897 5326041.8709701,-7877697.29155766 5326047.31160471,-7877700.61269851 5326052.7883884,-7877703.35860343 5326057.32286073,-7877705.64755139 5326060.97937184,-7877707.39922194 5326063.53828851,-7877712.20349697 5326069.51561351,-7877715.65618604 5326073.528964,-7877719.83264652 5326078.58405199,-7877735.51998188 5326098.9756643,-7877746.90652301 5326115.83884722,-7877749.8325007 5326120.56624556,-7877752.90540752 5326125.58873781,-7877755.80983676 5326130.22282166,-7877758.44859289 5326134.65401855,-7877761.23032686 5326139.38159523,-7877763.50536457 5326143.24649668,-7877765.50963776 5326146.6137523,-7877767.20564464 5326149.35852121,-7877768.51573634 5326151.44320237,-7877769.85992733 5326153.37505829,-7877773.69301398 5326158.03714941,-7877775.66070158 5326160.03666257,-7877778.37460835 5326162.92682483,-7877782.09405822 5326166.96517869,-7877786.9815752 5326172.42963244,-7877792.91571922 5326179.53418311,-7877799.38136621 5326188.29751631,-7877805.5576535 5326197.7876517,-7877811.20386718 5326207.57399401,-7877816.11764268 5326217.19728733,-7877820.5959949 5326226.83182442,-7877824.33605298 5326235.83710217,-7877827.22130326 5326243.41765574,-7877829.05156509 5326248.39216952,-7877829.72080163 5326250.58715273,-7877829.50769654 5326250.64867179,-7877829.14142356 5326250.16083058,-7877829.63350787 5326250.86451556,-7877831.53406722 5326253.02105832,-7877835.01053027 5326256.85169193,-7877839.59756894 5326261.85138294,-7877843.96759061 5326266.71830999,-7877847.5107397 5326270.797581,-7877849.76850702 5326273.41272705,-7877851.52430094 5326275.19455669,-7877858.87403366 5326281.29312698,-7877866.31702966 5326287.66507303,-7877731.13322687 5326435.24404656))}

No idea what the problem is.

Ethan · October 29, 2018, 8:36am

Hi Dan,

It looks one of your polygon is not valid, please try the code as below, we have two API to get different:

            string Poly1 = "POLYGON((-7877448.29829595 5324740.51763905,-7876028.63364608 5326029.2912219,-7877105.967813 5326250.79918145,-7878193.37052354 5325344.63025601,-7877448.29829595 5324740.51763905))";
        string Poly2 = "POLYGON((-7877731.13322687 5326435.24404656,-7877728.12455957 5326432.80810549,-7877715.06571897 5326421.71426822,-7877707.29751201 5326414.1799989,-7877700.46418759 5326406.88622082,-7877694.97808909 5326400.63313546,-7877690.07148653 5326395.08303144,-7877685.13452432 5326389.58100731,-7877679.08698649 5326382.65584006,-7877671.58723328 5326373.8024913,-7877663.29744665 5326362.90343487,-7877655.20065348 5326350.13532052,-7877648.49391143 5326337.32374974,-7877643.65901759 5326326.22222194,-7877640.54174649 5326317.98495092,-7877638.47946384 5326312.69251466,-7877637.02461236 5326309.41766151,-7877635.93699004 5326307.36492091,-7877635.03741436 5326305.89378408,-7877634.37552356 5326304.92447239,-7877634.1818622 5326304.75994379,-7877633.90649558 5326304.63083217,-7877633.16147015 5326303.94390602,-7877631.30797353 5326301.95562846,-7877628.59563059 5326298.9646886,-7877624.75405624 5326294.57147031,-7877620.04257439 5326289.20290238,-7877605.1368801 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5326287.66507303,-7877731.13322687 5326435.24404656))";

        PolygonShape p1 = new PolygonShape(Poly1);
        PolygonShape p2 = new PolygonShape(Poly2);

        Feature f1 = new Feature(p1);
        Feature f2 = new Feature(p2);            

        Feature result1 = SqlTypesGeometryHelper.GetDifference(f1.MakeValid(), f2.MakeValid());
        Feature result2 = f1.MakeValid().GetDifference(f2.MakeValid());

Regards,

Ethan