MS3D-GSM Display in 2D

8/13/2019 MS3D-GSM Display in 2D

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Visualizing a GSM in 2D on aFence Diagram or

Non-Orthogonal SectionIntroduc on

In the current version of MineSight 3-D (MS3D), crea ng a cross-sec on of a model view is possible only along an

orthogonal orienta on. This ar cle presents a method of viewing model data on a fence diagram or non-orthogonalplane u lizing a composite le drillhole view.

This method of viewing model data as drillhole data, in 2D on a fence diagram or on a non-orthogonal grid plane, can alsobe used to view a 3D block model (3DBM), as was demonstrated at the 2009 Annual Mintec Seminar (see 2009 Seminarworkshop paper, MineSight 3-D: Tips & Tricks ).

This newsle er ar cle demonstrates how to view Gridded Seam Model (GSM) data, in 2D on a fence diagram and on a non-orthogonal, non-ver cal sec on using a composite le drillhole view. This method should only be used as a visualiza on tool.

The basic methodology is: MineSight Compass (MSCompass): export the model data to an ASCII le. MineSight Data Reformat Tool (MSDART): create drillhole IDs (DHIDs). MSCompass: create a dummy composite le containing the ASCII model data. MS3D: create a drillhole view with the composite le and use the drillhole strips op on to simulate the block display

in a fence diagram or non-orthogonal plane.

Export the Model Data from the GSM Using MSCompass, export data from your exis ng GSM toASCII via the procedure, p60301.dat (Figure 1).

Table 1 summarizes which items from the model will be usedlater in the composite le (File 9).

Toggle on the op on to export the X, Y, Z loca ons rather thanthe model column, row, and bench values. And, since this is aGridded Seam project rather than a 3D block model project,toggle on the op on to omit the block centroid Z value in theoutput le. We will use the ZTOP and ZBOT values instead.Then output any quality items (i.e., BTU, MOIST, SULF, etc.)you might want to query or display in the resul ng drillholeview.

Figure 1 shows the rst two panels from procedure, p60301.dat . Choothe model items to export and toggle the op on to export the mid-block X,Y, Z values rather than column/row/bench, as well as the op on to export just the X and Y values (omit Z).


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Model items Composite fle items

X (block centroid) EAST

Y (block centroid) NORTH

ZTOP ZTOP

ZBOT ZBOT

Quality items(BTU, Moist, etc.)

Quality items(BTU, Moist, etc.)

Table 1 shows the associa on between the model items and the items inthe composite le. Note the rst four items in the composite le column arealso required items in a composite le.

Figure 2 shows a portion of the resulting output file fromprocedure p60301.dat . From left to right, the valuesfor X (Easting), Y (Northing), ZTOP, and ZBOT are shownfor a few blocks.

Figure 2 shows a por on of the ASCII le output from procedure p60301.dat; Eas ng, Northing, ZTOP, and ZBOT.

Use MSDART to Create DHIDsThe next step is assigning a DHID to each line of data so we can use MSCompass procedure p50001.dat to load the datainto a temporary composite le. Each line of data will correspond to one drillhole having a single composite.

Assigning the DHID is easily accomplished via MSDART, using the Counter op on on the Output Op ons panel (Figure 3). Onthe Load Op ons page, the source le is the resul ng output le from procedure p60301.dat , and the des na on le willbe used as input to p50001.dat . The Counter op on will add a eld called Counter that contains integer values that areincremented for every line in the des na on output le. As an op on, you can use the Reorder func on to place this eld inthe rst data column in the output le.

Figure 3 shows the Load Op ons and OutputOp ons panels from MSDART. On the LoadOp ons panel specify both the input le andoutput le names. On the Output Op ons paneluse the Counter op on to create a eld calledCounter. You can op onally use Reorder to put

the Counter eld in the rst column in the outputdata le.

Figure 4 shows a por on of the resul ng output le from MSDART. From le to right, the values for Counter (to be usedas DHID later on), X (Eas ng), Y (Northing), ZTOP and ZBOT are shown for a few blocks. Compare this to Figure 2. The onlydi erence between the les is the addi on of the Counter eld in the rst column.

Figure 4 shows a por on of the ASCII le output from MSDART; counter (will be used asDHID), Eas ng, Northing, ZTOP and ZBOT).


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Create a Composite File (dummy File 9)Create a dummy composite le. In our example, this le will be called coal09.gsm . Open MSCompass and click on theProject tab, then open the Project File Editor (PCF) (Figure 5). In the PCF Editor , either click on the New File bu on , or goto File | New... (Ctrl+N) and create a new 9 - Composite le.

The required items in a File 9 are displayed in blue; they cannot be edited and are always included (i.e., REF#). Add anyaddi onal quality items (match the model items that you exported), then save and name the new composite le.

WARNING: Make sure your REF# maximum is at least as large as the number of blocks in your model. The limitson the other items should match the limits in your GSM le.

Figure 5 shows the use of the PCF Editor inMSCompass to create a composite le (File 9).The items with blue highlight are required andcannot be changed.

Load Data to the Composite File (File 9) via Procedure, p50001.datLoad the data that was output from MSDART into the new composite File 9 using MSCompass procedure p50001.dat (Figures 6 and 7). Note the order of the data columns in the input le; in the procedure, the composite le items must belisted in the same order they occur in the input le. Since there is no corresponding survey le (File 12), choose the op on toload data to File 9 only, and then specify which composite le items to use for the collar geometry (EAST, NORTH, and ZTOPfor eleva on).


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Figure 6 shows the rst panel in procedure p50001.dat . The composite le items must

be listed in the order they occur in the input le.Load the Counter data created in MSDART toitem REF# it will serve as the DHID.

Figure 7 shows panels 2 and 3 fromprocedure p50001.dat . Since there is nocorresponding survey le (File 12), choose theop on to load the data to File 9 only. On thelast panel, choose the GSM eleva on itemto use for de ning the drillhole collars (thisis required in a GSM project regardless ofwhether you are loading data to a survey le[File 12] or not). Finally, toggle on DH-IDENTis a numeric ref# value op on.

Before proceeding further, check to ensure that the data was loaded properly. Use procedure p50301.dat (List CompositeData ). If the data was successfully loaded, proceed to the next step. If not, review the steps described previously. Review theASCII data les as well as the new composite le (File 9, i.e., do the data item descriptors (min/max/precision) in the le matchthe input data? etc.).


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Create a Composite File Drillhole View

In MS3D, create a Drillhole View ofthe new composite le (Figure 8).Each drillhole has a single intervalthat corresponds to a block in theGSM. Composite items EAST, NORTH,ZTOP, and ZBOT are used to de ne theloca on. To create a Drillhole View inMS3D, choose File or click right in theData Manager and then select New |

DH View | MineSight .

Figure 8 shows drillhole view crea on dialogs from MS3D. In the dialog on the le , choose CompositeFile (File 9) and select the new composite le ( coal09.gsm , in this example). Then, click on thetoggle for no survey since there is no survey le associated with this composite le. Composite itemswere previously selected for the collar geometry when the data was loaded to the composite le. Thedialog shown on the right is where the start and end point geometry items are de ned as well as the

item that contains the DHID.

Open the Model View and Drillhole View and use the same display item in each to visually verify that the composite drillholedata was loaded to the proper loca on (Figure 9).

WARNING: You have created a drillhole for every model block. Therefore, viewing the model blocks anddrillhole data at the same me can be resource intensive. Opening, closing, and changing the orienta on ofthe Viewer may be slow.

Figure 9 shows a 3D ver cally exaggerated view of a GSM Model View (in Surface/Slab display mode) overlaid with the Drillhole View of the compositedata. This con rms there is a drillhole interval for each model block.


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You can also visually verify that the data was loaded properly by viewing a Drillhole and Model View on an orthogonal crosssec on as shown in Figure 10.

Figure 10 shows an EW slab of GSM blocks and composite Drillhole View data on an Edit Grid. The composite data occurs in the center of the model blocks,and the length of the composite intervals is equal to the thickness of the model blocks which are outlined.

Add Strips and Projec on Volume to the Drillhole ViewIn order to view the data on a fence diagram or non-orthogonal sec on, you will need to switch to 2D mode.Simulate model blocks on sec on by turning on DrillholeStrips (Figure 11) in the Drillhole Proper es dialog. On theStrips tab, click on the bu on to Add a Color Strip , thenclick on the Color Strip Proper es bu on to specify thecolor display item and the strip width. In the example used inthis ar cle, we speci ed a width of 45m (which equals 90% ofthe model block size). Use the op on to center the strip overthe drillhole trace, this simulates a mid-block loca on.

Figure 11 shows the Drillhole Proper es | Strips tab, and the StripDefni on dialog for Color Strips.


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Set the projec on volume for the drillhole data on theDrillhole Proper es | Display tab (Figure 12). In this example,we use +25 m and -25 m to simulate the projects modelblock size (50 m). Because the method we are presen ng inthis ar cle is for visualiza on purposes only, you may wantto experiment with di erent projec on volume values to see

what works best for you.Figure 12 shows the Drillhole Proper es | Display tab, where you can setthe 2D projec on volume for drillhole data.

View the Data in 2D on a Fence DiagramA ach a fence polyline to the Viewer by clicking on the Set Fence geometry bu on . Choose an exis ng polyline to use forthe fence and then switch to 2D mode. In this example, our polyline exists on the horizontal plane, well above the highest levelin the model, has an a ributed name Fence1, and traverses across the project area. Figures 13, 14, and 15 show this fence inthree di erent views.

Figure 13 is an oblique view across the modelarea showing the model blocks, drillhole data,and the fence diagram. The model blocks areshown as Filled polygons, and the drillholedata is located in the center of the model blocks.

The fence polyline is de ned by the polyline withcircular nodes and Eas ng and Northing labels ateach fence post. The white fence plane is only for illustra ve purposes to show how the fencesec on bends across the project area.

Figure 14 is a plan view showing the modelblocks and the fence polyline with its nodeslabeled with their Eas ng and Northing values.The dashed lines are 25m on either side of thefence polyline to show the projec on volume.


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Figure 15 is a fence diagram cross-sec on of pseudo GSM data. Drillhole data is displayed using a strip width of 45m centered on the +/-25m projec onvolume to simulate a GSM block (xy block size in this project is 25 x 25), and a strip width of 45m centered on the drillhole.

View the Data in 2D on a Non-Orthogonal, Non-Ver cal Grid Plane

The same method is used to displayGSM data on a non-orthogonal sec on(ver cal or non-ver cal). A ach anexis ng non-orthogonal grid planeto the Viewer using the Set a grid setto the Viewer bu on , and thenswitch to 2D mode. In the example inthis ar cle, we are using a non-ver cal,non-orthogonal grid plane (Figures

16 and 17). The pseudo modelblocks appear o set from one anotherbecause of the Grid plane orienta on,the projec on volume, and Strip width.Tweaking the projec on volume and/or the Strip width may create a moreacceptable view.

Figure 16 shows the non-orthogonal, non-ver cal Grid plane in rela on to a GSM Model View and thecomposite drillhole data.


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Figure 17 shows a por on of the 2D sec on view on the non-orthogonal, non-ver cal grid plane shown in Figure 1 6 displaying pseudo GSM data(composite drillhole data). Drillhole data is displayed using a strip width of 45m centered on the +/-25m projec on volume to simulate a GSM block (xyblock size in this project is 25 x 25).

ConclusionsIn summary, un l the op on is available to view a 2D cross sec on of your GSM in any orienta on in MS3D, you can usethe following methodology as a visualiza on tool:

1. MSCompass: export X, Y, ZTOP, ZBOT, and any quality items of interest from the GSM using procedure, p60301.dat .

2. MSDART: create DHIDs.

3. MSCompass: create a dummy composite le (File 9) and load the data into the composite le (File 9) viaprocedure p50001.dat .

4. MS3D: create a Composite Drillhole View.5. MS3D: add strips and set the Projec on Volume in the Drillhole View.

6. MS3D: view the data on a fence diagram.

7. MS3D: view the data on a non-orthogonal, non-ver cal Grid Plane.

MS3D-GSM Display in 2D

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