Intersection operation returns geometry with some coordinates with the incorrect precision for the PrecisionModel used

[dbotija-RatedPower]

Hi, I found a case where I have two geometries, created with a PrecisionModel with scale 10000, and the intersecting geometry result have some coordinates with more decimals than it should have (4).

I replicated it in a unit test:

@Test
void intersectionPrecisionIssue() throws ParseException {
  PrecisionModel precisionModel = new PrecisionModel(10000);
  GeometryFactory jtsGeometryFactory = new GeometryFactory(precisionModel);
  
  WKTReader reader = new WKTReader(jtsGeometryFactory);
  Geometry polygon1 = reader.read("POLYGON ((18270.0442 4093.366, 18270.0442 4136.5772, 18270.1562 4137.0371, 18365.2813 4320.7098, 18371.2196 4306.0107, 18371.3956 4305.6304, 18372.3693 4303.7719, 18372.8271 4303.0744, 18374.1447 4301.4424, 18374.4237 4301.1298, 18382.1461 4293.29, 18466.5478 4195.7056, 18467.1167 4195.1597, 18468.2233 4194.2795, 18468.5443 4194.0477, 18500.4094 4173.228, 18505.4339 4168.1271, 18505.8255 4167.7759, 18507.8925 4166.1413, 18508.3244 4165.8412, 18555.726 4137.0858, 18556.5044 4136.5772, 18563.5213 4131.9926, 18564.0319 4131.7071, 18565.9201 4130.8159, 18566.2129 4130.7241, 18569.3143 4128.8427, 18569.8295 4128.5765, 18570.8922 4128.1162, 18572.49 4127.4242, 18573.6008 4127.1136, 18576.4737 4126.719, 18577.052 4126.6795, 18642.3008 4126.6801, 18713.7325 4109.5628, 18723.1374 4105.754, 18729.7373 4103.0812, 18730.2452 4102.9119, 18752.8122 4096.939, 18865.3335 4067.1574, 18946.5485 4033.1466, 18974.9936 4017.4059, 18984.0767 4011.492, 18997.4862 4002.7613, 19020.4646 3987.8004, 19020.959 3987.5235, 19022.7875 3986.6544, 19023.6753 3986.3474, 19024.9942 3986.0494, 19025.3674 3985.9824, 19065.0917 3980.6688, 19124.2595 3972.7544, 19124.6829 3972.7192, 19126.1988 3972.6692, 19127.0414 3972.7254, 19174.4375 3980.6688, 19238.4397 3991.3953, 19239.5027 3991.7208, 19241.6778 3992.7141, 19242.2629 3993.0393, 19242.714 3993.3387, 19247.2962 3994.0553, 19248.2187 3994.3086, 19250.8963 3995.3802, 19251.7396 3995.8338, 19253.3222 3996.9316, 19253.6279 3997.1649, 19255.2062 3998.4862, 19270.7417 4011.492, 19273.3567 4013.6812, 19296.6796 4029.1642, 19343.3123 4036.4951, 19418.9728 4025.8157, 19419.389 4025.7777, 19421.4788 4025.6902, 19422.31 4025.737, 19424.3763 4026.0585, 19425.1829 4026.2667, 19427.1468 4026.9851, 19427.8973 4027.3465, 19429.6834 4028.4342, 19430.3492 4028.9353, 19431.8887 4030.3506, 19432.4439 4030.972, 19433.6777 4032.6605, 19434.1009 4033.378, 19434.9816 4035.2747, 19435.2568 4036.0612, 19435.7505 4038.0932, 19435.8669 4038.9183, 19435.9546 4041.0071, 19435.8707 4042.0438, 19435.2384 4045.1098, 19434.9053 4046.0951, 19433.9979 4047.9797, 19433.564 4048.6922, 19432.3066 4050.3624, 19431.584 4051.1106, 19429.1501 4053.0793, 19428.0763 4053.7126, 19425.1759 4054.8904, 19424.1715 4055.1609, 19403.4223 4058.0926, 19403.3854 4058.3713, 19403.3165 4058.6384, 19403.1295 4059.3631, 19402.3264 4061.4136, 19401.8408 4062.3152, 19401.3402 4063.0241, 19400.992 4063.5172, 19400.4557 4064.1392, 19399.392 4065.1551, 19398.7467 4065.6618, 19397.5076 4066.4544, 19396.7766 4066.8279, 19395.4087 4067.3673, 19394.4178 4067.6255, 19392.2354 4067.9199, 19391.2108 4067.9334, 19358.6586 4064.4173, 19344.1888 4066.4617, 19343.4415 4066.5008, 19341.5645 4066.4333, 19341.1869 4066.4028, 19287.6402 4059.6685, 19284.1928 4059.2349, 19283.4051 4059.0586, 19282.117 4058.6384, 19281.472 4058.428, 19280.555 4058.0023, 19277.9648 4056.4008, 19277.4716 4056.0448, 19246.8216 4030.3851, 19234.5756 4022.2262, 19134.5694 4006.6258, 19040.5397 4015.1734, 18977.6476 4049.9676, 18934.5636 4077.9859, 18934.1733 4078.2112, 18932.7388 4078.9408, 18931.9022 4079.2604, 18881.9788 4092.5088, 18841.0142 4109.6506, 18840.3647 4109.8628, 18789.4329 4122.0772, 18783.1322 4123.5882, 18714.8015 4139.9752, 18673.2886 4156.4119, 18672.9236 4156.5376, 18671.6011 4156.9267, 18670.8491 4157.0759, 18669.479 4157.221, 18669.0945 4157.2441, 18577.7922 4158.5996, 18541.908 4180.3666, 18523.2578 4192.5494, 18399.4103 4318.282, 18394.8256 4327.211, 18383.333 4355.565, 18485.0487 4551.963, 18619.6375 4504.3857, 18620.0379 4504.266, 18622.0689 4503.7659, 18622.8933 4503.6469, 18624.9818 4503.5526, 18626.0185 4503.6331, 18629.0865 4504.2555, 18630.073 4504.5856, 18631.9605 4505.487, 18632.6739 4505.9183, 18634.3487 4507.1705, 18634.9638 4507.7323, 18636.3622 4509.2872, 18636.8561 4509.9585, 18637.9242 4511.7564, 18638.2773 4512.5107, 18638.9742 4514.4823, 18639.1736 4515.2915, 18639.4724 4517.3613, 18639.51 4518.1935, 18639.3993 4520.2817, 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5149.5445, 19015.632 5149.2767, 19014.3722 5147.8787, 19013.9222 5147.281, 19012.9274 5145.6843, 19012.743 5145.3569, 19001.5682 5123.2887, 19000.7612 5122.3226, 19000.3225 5121.6883, 18999.6409 5120.4817, 18999.4638 5120.1314, 18995.5274 5111.3592, 18971.7251 5064.3539, 18971.5617 5063.9898, 18970.8292 5062.1278, 18970.7008 5061.7501, 18955.6961 5009.7455, 18955.6001 5009.3386, 18955.2205 5007.2816, 18955.1503 5006.4533, 18955.2063 5002.2765, 18951.6321 4989.6715, 18951.5331 4989.2367, 18951.2615 4987.6669, 18951.2023 4986.7835, 18954.0639 4910.2505, 18954.1051 4909.7977, 18956.684 4892.0624, 18957.967 4796.3742, 18953.5307 4771.4035, 18938.7392 4721.8666, 18938.6353 4721.4393, 18938.2268 4719.2763, 18938.1538 4718.4077, 18939.1333 4666.3094, 18939.1615 4665.8933, 18939.4023 4663.8441, 18939.5762 4663.0426, 18940.2059 4661.0785, 18940.3506 4660.6925, 18943.4069 4653.6078, 18943.7321 4642.8822, 18943.7655 4642.4638, 18943.9573 4640.9866, 18944.144 4640.1779, 18944.6191 4638.7665, 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  List<Coordinate> coordinatesWithMoreDecimals = new ArrayList<>();
  for(Coordinate coordinate : intersection.getCoordinates()) {
	  BigDecimal decimalCoordinate = new BigDecimal(String.valueOf(coordinate.getX()));
	  if(decimalCoordinate.scale() > 4) {
		  coordinatesWithMoreDecimals.add(coordinate);
		  System.out.println(coordinate);
	  }
  }
  Assertions.assertTrue(coordinatesWithMoreDecimals.isEmpty());
}

This test fails because the intersection geometry has these coordinates with the x value not being rounded to 4 decimal places:

(19035.040399999998, 5362.0221, NaN)
(19074.572500000002, 4496.9724, NaN)
(19973.771099999998, 4136.8438, NaN)
(20074.769800000002, 4319.9262, NaN)
(20291.215799999998, 4163.6581, NaN)
(18627.772100000002, 3859.0718, NaN)

I have problems with those coordinates later in my code when using the equals() between the ones with the not rounded x value and the rounded ones, as they are not equal anymore.
For example here ((Polygon) intersection).getExteriorRing().getPointN(128) and reader.read("POINT (19035.0404 5362.0221)") they are both POINT (19035.0404 5362.0221), but they are not equal to each other.

I think this is a very uncommon case because I use the intersection operation extensively and this is the first time I have found this issue. Also it seems like it only affects the x value of the coordinate and not the y.

[MansoorAhmadi]

We have a similar issue. Please, look at this issue, there seems to a similarity : #991