Questions in topic: "areacalculator"
https://knowledge.safe.com/questions/topics/single/1007.html
The latest questions for the topic "areacalculator"Area Calculator vs SHAPE_Area
https://knowledge.safe.com/questions/89035/area-calculator-vs-shape-area.html
<div class="fr-view clearfix"><p>Hi Community!</p><p><br /></p><p>I was wondering if anyone had an idea of why I am getting different values for polygonal areas when calculated in FME using AreaCalculator vs the SHAPE_Area attribute of an ESRI feature class?</p><p>The geometry I am working with enters the workbench with a defined projected coordinate system (DUB-DTLM) from a dwg file and the feature dataset in which the destination feature class resides is also in DUB-DTLM.</p><p>The discrepancies are minor (at the 3rd decimal place in sqm) but nonetheless have the potential to cause issues.</p><p>Interestingly, when the features are interrogated in Map3D, they show the same area as is calculated in FME.</p><p>Any explanation (or even hint!) as to the cause of the difference would be much appreciated.</p></div>esri geodatabaseareacalculatordwg readerMon, 25 Mar 2019 13:21:13 GMTmapmechanicHow to get 3D Area using Simpson's rule?
https://knowledge.safe.com/questions/87746/how-to-get-3d-area-using-simpsons-rule.html
<div class="fr-view clearfix"><p>Good morning!</p><p><br /></p><p>My input data is a series of 3D polygons that represent Administrative Units stored in an ESRI Geodatabase.</p><p>I've been tasked with calculating the area of those polygons. For that i wanted to use the AreaCalculator transformer with Type parameter as "Sloped Area".</p><p>No problems there. Except the final user of that data wants the area to be calculated using the Simpson's Rule. I had no idea what that was, so I've been looking for info a little bit:</p><p><a rel="noopener noreferrer" href="https://www.emathzone.com/tutorials/geometry/simpsons-rule.html" target="_blank">https://www.emathzone.com/tutorials/geometry/simpsons-rule.html</a></p><p>I still don't know how to translate that to FME. Could anyone give me any pointers, please?</p></div>areacalculatorThu, 28 Feb 2019 11:55:27 GMToscardCalculating polygon area
https://knowledge.safe.com/questions/82739/calculating-polygon-area.html
<div class="fr-view clearfix"><p>I am converting a kml to shp and trying to calculate the area of the resulting polygons. It seems to run okay, but I don't see the calculated result. The field that should have it is blank in the attribute table in ArcMap. Here is the AreaCalculator transformer: <img src="/storage/attachments/22952-exercise1-error-areacalculator.jpg" style="width:556px" /></p><p>This is Inspector:</p><p><img src="/storage/attachments/22953-exercise1-error-inspector.jpg" style="width:550px" /></p><p>Is it actually doing the calculation? Where is the result?</p><p>Thank you..</p></div>areacalculatorSun, 18 Nov 2018 01:52:19 GMTregulusdenebAreaOnAreaOverlayer to get only polygons that overlap polygons from certain group
https://knowledge.safe.com/questions/74270/areaonareaoverlayer-to-get-only-polygons-that-over.html
<p>Hello,</p><p></p><p>I have one feature reader where I read filter polygons from table A. As a result I get few of them.</p><p></p><p>Then I have separate reader where I read polygons from different table B. I have like 2000 of them.</p><p></p><p>Then I would like to get as a result only those polygons from table B which are inside any of the polygons from tabel A or % of the area inside one of the polygons from table B is let's say 90%.</p><p></p><p>What would be the best way of doing that? </p>overlapareacalculatorThu, 12 Jul 2018 14:44:29 GMTwitosArea calculator different with Qgis software
https://knowledge.safe.com/questions/73052/area-calculator-different-with-qgis-software.html
<p>Hi everybody,</p><p>Why FME calculates different area in compare with Qgis.</p><p></p><p>I have one area calculates in FME as: 46,56, but in Qgis the area is: 56,56.</p><p></p><p>ThankĀ“s</p><p></p>areacalculatorMon, 25 Jun 2018 13:24:36 GMTmr_fmecalculate area of buildings within site area
https://knowledge.safe.com/questions/40773/calculate-area-of-buildings-within-site-area.html
<p>I have tried to calculate the building footprint area within each building site and output the result as an excel table. I also want to count the number of Buildings. There are numerous buildings within each site and I want to export the data as below.</p><p>Building Site A - 4390 sqm </p><p>Building Site B - 5293 sqm</p><p> How do I achieve this as I only seem to be exporting the site area.</p><p>Thanks in advance.</p><p></p><p></p>statisticsareacalculatorThu, 02 Mar 2017 12:51:27 GMTingallaMerge/combine attributes of the biggest geometry within target dataset feature only
https://knowledge.safe.com/questions/39852/mergecombine-attributes-of-the-biggest-geometry-wi.html
<p>I'm adding data from two different data sets into one and i'm struggling to get the final merge ready.</p><p>I have two data sets with roads, DS1 (data set 1) has more detailed information but the geometry is not correct and the other DS2 (data set 2) is the other way around and has the leading geomtry. Luckily the geometry does not differ that much in shape, the problem is that DS1 has a bit more pieces. </p><p>So i need a check on how many features of DS2 are within DS1 and than merge the information from the largest (in area) features from DS1 puts/merges his information into that feature of DS2.</p><p>I tried a tester and AreaOnAreaOverlayer but then the data explodes into a huge dataset. I tried to narrow the results down but in the end i still need a final merge that says the largest feature gives the information to the correct geometry. </p><p> </p><p></p><p> </p><p></p>featuremergeraggregatormergeareacalculatorMon, 13 Feb 2017 08:50:22 GMTjdh009Calculate percentage change in two sets of polygons based on area.
https://knowledge.safe.com/questions/39348/calculate-percentage-change-in-two-sets-of-polygon.html
<p>Hi,</p><p>I am trying to calculate the percentage change in area between two sets of postal code polygons. </p><p>So I have an old polygon file and a newer one, and I connect them to an AreaCalculator to get the area of the polygons. Now, for the calculation of %change I would use the ExpressionEvaluator but I cannot figure out how to keep the output tied to its original row. It either puts out way too many values as its own thing or treats it as one big calculation.</p><p>I just can't really figure out how to set this up. It should be as simple as X divided by Y but it does not seem to want to cooperate on the output.</p><br><p><img src="/storage/attachments/6331-1-31-2017-10-25-21-am.png"></p><p>This
is what I have so far. It creates the _area_F0 and E0 as I want, but
when I try to do the division in the expressionevaluator it either fails
saying it's dividing by 0 if I use the "/" operator in an equation or
if I use the "div" function it runs but created a row for each
individual row in both readers so it ends up with 75k entries where the
result value is null. it should end with 38217 rows where 37280 should
have the result and the rest are null because there's no matching value.</p><p></p><p>Any advice on this would be greatly appreciated. Thank you.</p><p></p>expressionevaluatorareacalculatorTue, 31 Jan 2017 15:59:22 GMTjaymartinAreaCalculator: Invalid parameter 'REJECTABLE'
https://knowledge.safe.com/questions/37249/areacalculator-invalid-parameter-rejectable.html
<p>If I run a model with FME Desktop, there are no issues. If I run the same model with the same input in FME Server, I get the following error:</p><p>AreaCalculator(TeeFactory): AreaCalculator: Invalid parameter 'REJECTABLE'</p><p>What does this error mean, and why is it occuring only in FME Server?</p><p></p><p></p><p></p><p></p><p></p>fmeserverareacalculatorFri, 02 Dec 2016 10:48:26 GMTbakkermansArea/Length Calculated with MapInfo vs. Area/Length Calculated with FME
https://knowledge.safe.com/articles/197/arealength-calculated-with-mapinfo-vs-arealength-c.html
<h2>Question</h2><p>Why do the values I get with FME AreaCalculator and LengthCalculator differ from the values displayed in MapInfo? Can I get the same values as calculated by MapInfo Area() and ObjectLen() functions using FME?</p><h2>Answer</h2><p>Comparing area/length calculated with MapInfo to area/length calculated with FME is quite often confusing. You do get some difference in numbers. This is why: MapInfo uses either
<strong>Cartesian </strong>or <strong>Spherical </strong>method to calculate areas/distances (<strong>Spherical </strong>is used by default when possible), while FME always uses <strong>Cartesian </strong>method.<br>
<br>
This is how both methods are described in MapInfo Help:</p><ul>
<li><strong>Spherical</strong> - The Spherical calculations measure distance according to the curved surface of the Earth. <strong>Spherical</strong> is the default. The data is first converted to Latitude/Longitude and then a calculation is produced. Lat/Long data will always use spherical calculations.</li>
<li><strong>Cartesian</strong> - The Cartesian method performs calculations on data projected onto a flat plane. Cartesian coordinates (x,y) define the position of a point in two-dimensional space by its perpendicular projection onto two axes which are at right angles to each other. Long/Lat projections cannot use Cartesian calculations.</li></ul><p> To switch from Spherical calculation to Cartesian in MapInfo map window, please, select Map > Options.. and change the setting in Distance/Area Using GroupBox.<br>
<br>
If you use a MapInfo function to calculate an object area in MapInfo, you have three options: you can use either Area(), or SphericalArea(), or CartesianArea() function.</p><ul>
<li> If the table is Longitude\Latitude based, a SphericalArea() or Area() function can be used. If CartesianArea() is used on Longitdue\Latitude tables, a value of -1 will be returned.</li>
<li> If the table is Non-Earth based, CartesianArea() and Area() functions can be used. If SphericalArea() is used on Non-Earth tables, a value of -1 will be returned.</li>
<li> Any other projection or projected coordinate system tables other than Longitude\Latitude or Non-Earth (e.g.: UTM, Albers, Gauss-Kruger, Robinson, State Plane, etc.) can use all three functions of SphericalArea(), CartesianArea() or Area() to calculate this value in a column.</li></ul><p> NB: Area() will use the method set in Map > Options... > Distance/Area Using.<br>
<br>
The same applies to object length calculation using MapInfo functions. The three options in this case are: <strong>ObjectLen()</strong>, <strong>SphericalObjectLen()</strong>, and <strong>CartesianObjectLen()</strong>.<br>
</p><h2> Conclusion</h2><p> If you open your data in MapInfo, set Cartesian for distance/area calculation in map options, and check Cartesian area or length of an object, you will get exactly the same value as calculated by FME.<br>
</p>giscoordinate systemsmapinfolengthcalculatorareacalculatorThu, 08 Oct 2015 19:12:54 GMTlenaatsafe