diff --git a/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3-in-RDF-IFCViewer.png b/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3-in-RDF-IFCViewer.png
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diff --git a/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.ifc b/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.ifc
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+++ b/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.ifc
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+ISO-10303-21;
+HEADER;
+FILE_DESCRIPTION (('ViewDefinition[Ifc4x3NotAssigned]'), '2;1');
+FILE_NAME ('Georeferencing-Survey-12d-3.ifc', '2021-04-26T23:34:33', ('ljg'), ('12d Internet NW - Ranch'), 'IFC Engine rev 1257', '12d Model 15.0', '');
+FILE_SCHEMA (('IFC4X3_RC3'));
+ENDSEC;
+DATA;
+#1 = IFCPROJECT('2LJesmETv6W9jWXnI$q1Aj', #2, 'Georeferencing-Survey-12d-3', '', $, $, $, (#12), #7);
+#2 = IFCOWNERHISTORY(#3, #6, $, .NOCHANGE., $, $, $, 1619444073);
+#3 = IFCPERSONANDORGANIZATION(#4, #5, $);
+#4 = IFCPERSON($, $, 'ljg', $, $, $, $, $);
+#5 = IFCORGANIZATION($, '12d Internet NW - Ranch', '12d Internet NW - Ranch', $, $);
+#6 = IFCAPPLICATION(#5, '15.0', '12d Model', '12d Model');
+#7 = IFCUNITASSIGNMENT((#8, #9, #10, #11));
+#8 = IFCSIUNIT(*, .LENGTHUNIT., $, .METRE.);
+#9 = IFCSIUNIT(*, .AREAUNIT., $, .SQUARE_METRE.);
+#10 = IFCSIUNIT(*, .VOLUMEUNIT., $, .CUBIC_METRE.);
+#11 = IFCSIUNIT(*, .PLANEANGLEUNIT., $, .RADIAN.);
+#12 = IFCGEOMETRICREPRESENTATIONCONTEXT($, 'Model', 3, 1.E-6, #14, #18);
+#13 = IFCLOCALPLACEMENT($, #14);
+#14 = IFCAXIS2PLACEMENT3D(#15, #16, #17);
+#15 = IFCCARTESIANPOINT((0., 0., 0.));
+#16 = IFCDIRECTION((0., 0., 1.));
+#17 = IFCDIRECTION((1., 0., 0.));
+#18 = IFCDIRECTION((0., 1.));
+#19 = IFCPROJECTEDCRS('EPSG:7856', 'MGA2020 Zone 56 and AHD', 'EPSG:7844', 'EPSG:5711', 'UTM', '56', $);
+#20 = IFCMAPCONVERSION(#12, #19, 0., 0., 0., 1., 0., 1., 1., 1.);
+#21 = IFCSITE('0cEC8I7n115wd$bDGXiGnK', #2, 'Default Site', 'Description of Default Site', $, #13, $, $, .ELEMENT., $, $, $, $, $);
+#22 = IFCRELAGGREGATES('3K7e7XBtz3JOOXMsZJrMxB', #2, 'ProjectContainer', 'ProjectContainer for Sites', #1, (#21));
+#23 = IFCFACILITY('0nEAPsbGvABv_85cELtcxf', #2, 'All on string', 'Description of All on string', $, #13, $, $, .ELEMENT.);
+#24 = IFCRELAGGREGATES('1qGCqhwJX1cAZqB4Oue1$1', #2, 'SiteContainer', 'SiteContainer For All Models', #21, (#23));
+#25 = IFCRELCONTAINEDINSPATIALSTRUCTURE('1fg8xKaRjEDgLMqALe$c84', #2, 'FacilityContainer', 'FacilityContainer for Elements', (#26), #23);
+#26 = IFCANNOTATION('1GFw8fpSrCkwvlQELfbWOr', #2, 'SW', $, 'Super', #13, #27, .NOTDEFINED.);
+#27 = IFCPRODUCTDEFINITIONSHAPE($, $, (#28));
+#28 = IFCSHAPEREPRESENTATION(#12, 'Body', 'GeometricCurveSet', (#29));
+#29 = IFCPOLYLINE((#30, #31, #32, #33, #34));
+#30 = IFCCARTESIANPOINT((256566.71394629, 7411793.56535756, 38.47979312));
+#31 = IFCCARTESIANPOINT((256594.45838039, 7411770.44499658, 39.));
+#32 = IFCCARTESIANPOINT((256616.91816057, 7411739.72794533, 39.5));
+#33 = IFCCARTESIANPOINT((256634.42357754, 7411711.65322103, 40.));
+#34 = IFCCARTESIANPOINT((256656.55306694, 7411674.6606431, 40.5));
+#35 = IFCPROPERTYSET('3OnwxMQsjDExWfqhKkm8ZH', #2, 'SW', $, (#36, #37, #38));
+#36 = IFCPROPERTYSINGLEVALUE('STRMATERIAL', $, IFCLABEL('RCP'), $);
+#37 = IFCPROPERTYSINGLEVALUE('STRSHAPE', $, IFCLABEL('diameter'), $);
+#38 = IFCPROPERTYSINGLEVALUE('STRDIAMETER', $, IFCREAL(2.4), $);
+#39 = IFCRELDEFINESBYPROPERTIES('34othb4PL1Kg$ksXkccSqd', #2, '12d Model Property Sets', 'Custom String Attributes', (#26), #35);
+#40 = IFCPROPERTYSET('2VDPGzO_HDiwXPrNzpMDVT', #2, 'Vertex', $, (#41, #47));
+#41 = IFCCOMPLEXPROPERTY('SW', '12d_attribute_group', '12d_attribute_group', (#42, #43, #44, #45, #46));
+#42 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL1', $, IFCLABEL('QL_1'), $);
+#43 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL2', $, IFCLABEL('QL_2'), $);
+#44 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL3', $, IFCLABEL('QL_3'), $);
+#45 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL4', $, IFCLABEL('QL_4'), $);
+#46 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL5', $, IFCLABEL('QL_5'), $);
+#47 = IFCCOMPLEXPROPERTY('PT_ID', '12d_attribute_group', '12d_attribute_group', (#48, #49, #50, #51, #52));
+#48 = IFCPROPERTYSINGLEVALUE('Point_Id1', $, IFCLABEL('42'), $);
+#49 = IFCPROPERTYSINGLEVALUE('Point_Id2', $, IFCLABEL('43'), $);
+#50 = IFCPROPERTYSINGLEVALUE('Point_Id3', $, IFCLABEL('44'), $);
+#51 = IFCPROPERTYSINGLEVALUE('Point_Id4', $, IFCLABEL('45'), $);
+#52 = IFCPROPERTYSINGLEVALUE('Point_Id5', $, IFCLABEL('46'), $);
+#53 = IFCRELDEFINESBYPROPERTIES('0COXzjPinAqQnQlbpjPJdf', #2, '12d Model Property Sets', 'Custom String Attributes', (#26), #40);
+#54 = IFCPROPERTYSET('0RQ1CujmbD9uARTUDpgX5G', #2, 'Segment', $, (#55));
+#55 = IFCCOMPLEXPROPERTY('SW', '12d_attribute_group', '12d_attribute_group', (#56, #57, #58, #59));
+#56 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL1', $, IFCLABEL('QL_A'), $);
+#57 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL2', $, IFCLABEL('QL_B'), $);
+#58 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL3', $, IFCLABEL('QL_C'), $);
+#59 = IFCPROPERTYSINGLEVALUE('QUALITY LEVEL4', $, IFCLABEL('QL_D'), $);
+#60 = IFCRELDEFINESBYPROPERTIES('01Zpn5brr9SRxdtQKLICQQ', #2, '12d Model Property Sets', 'Custom String Attributes', (#26), #54);
+ENDSEC;
+END-ISO-10303-21;
diff --git a/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.png b/Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.png
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index 00000000..411fc2d4
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diff --git a/Georeferencing-Survey-12d-3/readme.md b/Georeferencing-Survey-12d-3/readme.md
new file mode 100644
index 00000000..87e76271
--- /dev/null
+++ b/Georeferencing-Survey-12d-3/readme.md
@@ -0,0 +1,64 @@
+
+### Intent
+
+Survey data is collected from the very beginning of a project and the position and elevation of any other data in the project must be tied back to accurate survey.  
+Survey data starts with points and strings which are an ordered set of points (vertices) vertices connected by segments.
+So a survey point is just a survey string with only one vertex.
+ 
+As well as collecting the (x,y) and sometimes a z for each vertex, surveyors also collect properties for the entire string, properties for each vertex of the string and properties for each segment of the string.
+For example when picking up the top of a buried pipe, the Quality level can vary for each vertex and for each segment of the pipe.
+
+However I have no idea how these prperties can be represented in IFC.
+So as a start I have mapped the Property set for the vertices and segments to Property Sets for IfcAnnotation with:
+
+- Property sets with properties for the entire string
+- Property set Vertex with the properties for each vertex with the property name for a vertex appended by the number for the vertex (starting at 1)
+- Property set Segment with the properties for each segment with the property name for a segment appended by the number for the segment (starting at 1)
+
+This encoding is to allow the process to be reversed when read into another software package. 
+
+So this scenario covers one simple survey string with property sets for the entire string, property sets for vertex properties and property sets for segment properties
+
+I am definitely happy to hear any suggestions on how slese this could be done.
+
+This IFC file has a survey consisting of:
+
+- one survey string with name "RD ET"
+- Property Set "SW" with properties STRMATERIAL, STRSHAPE and STRDIAMETER
+- Property Set "Vertex" containing Property sets "SW" and "PT ID" 
+- Property Set "Segment" containing Property sets "SW" 
+
+The coordinates are in Easting, Northing and AHD for the map projection MGA2020 Zone 56.
+The Horizontal and Vertical datums, and Map Projection, are specified in IfcProjectedCRS.
+IfcMapConversion is a "No Operation" as the data in the file is already in map coordinates and needs no further transformation. 
+
+![georefsurvey12d3](../Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3.png  "Simple Survey String with Property Sets")
+![georefsurvey12d3RDF](../Georeferencing-Survey-12d-3/Georeferencing-Survey-12d-3-in-RDF-ifcviewer.png  "Simple Survey with Property Set in RDF ifcviewer")
+
+The IFC file was written by 12d Model. 
+
+### Prerequisites
+
+This scenario builds upon following other scenarios:
+
+- Georeferencing-Survey-12d-2
+
+### Content
+
+This scenario covers the following new concepts and/or IFC entities:
+
+-  `IfcComplexProperty`
+-  `IfcPropertySingleValue` with `IfcPropertySingleValue.Nominalvalue` IFCLABEL
+-  `IfcPropertySingleValue` with `IfcPropertySingleValue.Nominalvalue` IFCREAL
+
+
+### Supporting files
+
+Following files correspond to this scenario:
+
+| Filename                           | Description                        |
+|------------------------------------|------------------------------------|
+| `Georeferencing-Survey-12d-3.ifc`  | the exported content as IFC document |
+| `Georeferencing-Survey-12d-3.png`      | screen shot from 12d Model           |
+| `Georeferencing-Survey-12d-3-RDF-ifcviewer.png`      | screen shot from RDF ifcviewer      |
+