Hi Martin, I did try that but I think the rounded actually works a little better in this case.
For context this buffering is used to extract the DEM points 200m from the mapsheet boundary. The existing processes have a square boundary so in my new processes I was trying to make it exactly the same. The other part is when I'm doing a change detection between a file and the data in the database there are a few points which don't get read from the DB if I use the rounded buffer. I solved that by just increasing the buffer size to return more data so it does work. Paul Martin Davis wrote: > Further on this, the closest you could get to this is to set the > number of quadrant segments to 0. This will produce a chamfered > corner (i.e. a corner formed by a single line segment, rather than a > more curved one). > > Paul Austin wrote: >> Is it possible with JTS to take a polygon which has sqaure corners (a >> mapsheet square but rotated due to the projection) and create a buffer >> from it such that the corners are squared off? I tried the end cap style >> square or butt but it made no difference. >> >> Here is the original polygon >> >> POLYGON ((1797894.1999176415 628157.1915035518, 1797824.0932976399 >> 628596.6109235631, 1797753.9863068706 629036.0326674981, >> 1797683.8789455905 629475.4567337483, 1797613.7712140563 >> 629914.8831207063, 1797543.663112523 630354.3118267683, >> 1797473.554641249 630793.7428503223, 1797403.4458004911 >> 631233.1761897514, 1797333.3365905043 631672.6118434612, >> 1797263.227011545 632112.0498098433, 1797193.117063873 >> 632551.4900872735, 1797123.0067477413 632990.9326741584, >> 1797052.8960634102 633430.3775688717, 1796982.785011134 >> 633869.8247698182, 1796912.6735911716 634309.2742753765, >> 1796842.561803779 634748.7260839399, 1796772.4496492133 >> 635188.1801938973, 1796702.3371277326 635627.636603632, >> 1796632.2242395934 636067.0953115365, 1796562.1109850537 >> 636506.556315992, 1796491.9973643706 636946.0196153894, >> 1796421.8833778012 637385.4852081146, 1796351.7690256038 >> 637824.9530925499, 1796281.6543080346 638264.4232670888, >> 1796211.5392253534 638703.8957301043, 1796141.423777815 >> 639143.3704799991, 1796423.3824002002 639188.3633832727, >> 1796705.3384798681 639233.3722181804, 1796987.292015922 >> 639278.3969845781, 1797269.2430074578 639323.4376823222, >> 1797551.191453578 639368.4943112694, 1797833.137353383 >> 639413.5668712752, 1798115.0807059696 639458.6553621963, >> 1798397.02151044 639503.7597838882, 1798678.9597658948 >> 639548.8801362077, 1798960.8954714332 639594.0164190093, >> 1799242.8286261521 639639.1686321506, 1799524.7592291539 >> 639684.3367754864, 1799806.6872795406 639729.5208488721, >> 1800088.6127764075 639774.7208521646, 1800370.535718859 >> 639819.9367852192, 1800652.4561059908 639865.1686478918, >> 1800934.373936907 639910.4164400371, 1801216.2892107035 >> 639955.6801615115, 1801498.201926482 640000.9598121699, >> 1801780.1120833447 640046.2553918678, 1802062.0196803873 >> 640091.566900461, 1802343.9247167122 640136.894337804, >> 1802625.8271914208 640182.2377037536, 1802907.7271036115 >> 640227.5969981635, 1803189.6244523805 640272.9722208893, >> 1803471.5192368347 640318.3633717867, 1803753.4114560713 >> 640363.7704507103, 1804035.301109188 640409.193457515, >> 1804317.1881952866 640454.6323920563, 1804599.0727134692 >> 640500.087254189, 1804880.9546628317 640545.5580437677, >> 1805162.8340424765 640591.0447606472, 1805444.7108515054 >> 640636.5474046832, 1805726.5850890144 640682.0659757284, >> 1806008.456754108 640727.6004736396, 1806290.3258458816 >> 640773.1508982703, 1806572.1923634377 640818.7172494745, >> 1806854.0563058783 640864.2995271087, 1807135.9176722998 >> 640909.8977310257, 1807417.776461806 640955.5118610812, >> 1807699.632673493 641001.1419171281, 1807981.4863064648 >> 641046.7878990211, 1808263.337359818 641092.4498066148, >> 1808545.185832656 641138.127639764, 1808827.0317240763 >> 641183.8213983225, 1809108.8750331795 641229.5310821431, >> 1809390.7157590685 641275.2566910824, 1809672.5539008398 >> 641320.9982249914, 1809954.3894575967 641366.7556837266, >> 1810236.2224284364 641412.529067141, 1810307.5791920098 >> 640973.2541599683, 1810378.9355842664 640533.9815386357, >> 1810450.291604947 640094.7112047393, 1810521.6472537876 >> 639655.4431599053, 1810593.002530527 639216.1774057383, >> 1810664.3574349028 638776.913943857, 1810735.7119666527 >> 638337.6527758734, 1810807.0661255154 637898.393903397, >> 1810878.4199112286 637459.1373280454, 1810949.7733235303 >> 637019.8830514252, 1811021.1263621591 636580.6310751522, >> 1811092.4790268526 636141.3814008376, 1811163.8313173503 >> 635702.1340300869, 1811235.1832333892 635262.8889645198, >> 1811306.5347747095 634823.6462057317, 1811377.885941048 >> 634384.4057553485, 1811449.2367321453 633945.1676149629, >> 1811520.5871477379 633505.9317861982, 1811591.9371875648 >> 633066.6982706608, 1811663.286851367 632627.4670699462, >> 1811734.636138882 632188.2381856693, 1811805.985049848 >> 631749.0116194421, 1811877.3335840045 631309.7873728676, >> 1811948.681741091 630870.5654475512, 1812020.0295208457 >> 630431.3458451033, 1811737.5760696593 630385.4716875153, >> 1811455.1200268625 630339.613489666, 1811172.6613933602 >> 630293.7712517017, 1810890.200170051 630247.9449737687, >> 1810607.7363578402 630202.1346560149, 1810325.2699576276 >> 630156.3402985837, 1810042.8009703136 630110.5619016234, >> 1809760.3293968034 630064.7994652791, 1809477.8552379953 >> 630019.052989698, 1809195.378494795 629973.3224750245, >> 1808912.8991680997 629927.6079214066, 1808630.4172588163 >> 629881.9093289888, 1808347.932767842 629836.2266979171, >> 1808065.4456960831 629790.5600283379, 1807782.9560444392 >> 629744.9093203973, 1807500.4638138101 629699.2745742397, >> 1807217.969005102 629653.6557900123, 1806935.4716192128 >> 629608.0529678604, 1806652.971657048 629562.4661079282, >> 1806370.4691195083 629516.895210363, 1806087.9640074926 629471.34027531, >> 1805805.456321908 629425.8013029136, 1805522.9460636533 629380.27829332, >> 1805240.4332336294 629334.7712466745, 1804957.9178327401 >> 629289.2801631214, 1804675.3998618906 629243.805042808, >> 1804392.879321976 629198.3458858775, 1804110.3562139017 >> 629152.9026924763, 1803827.8305385713 629107.4754627487, >> 1803545.3022968858 629062.0641968409, 1803262.7714897445 >> 629016.6688948963, 1802980.2381180534 628971.2895570602, >> 1802697.702182713 628925.9261834789, 1802415.163684623 >> 628880.5787742948, 1802132.6226246897 628835.2473296551, >> 1801850.0790038109 628789.9318497032, 1801567.5328228928 >> 628744.6323345844, 1801284.9840828334 628699.3487844421, >> 1801002.432784539 628654.0811994225, 1800719.8789289095 >> 628608.829579669, 1800437.3225168448 628563.5939253271, >> 1800154.7635492496 628518.3742365399, 1799872.2020270275 >> 628473.170513453, 1799589.6379510786 628427.9827562096, >> 1799307.0713223037 628382.810964955, 1799024.502141608 >> 628337.6551398328, 1798741.930409892 628292.5152809871, >> 1798459.3561280563 628247.3913885625, 1798176.7792970068 >> 628202.2834627023, 1797894.1999176415 628157.1915035518)) >> _______________________________________________ >> jts-devel mailing list >> jts-devel@lists.jump-project.org >> http://lists.refractions.net/mailman/listinfo/jts-devel >> >> > _______________________________________________ jts-devel mailing list jts-devel@lists.jump-project.org http://lists.refractions.net/mailman/listinfo/jts-devel
