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QuikMap FAQs
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Automatic Offsets From A Bingo Card
QuikMap has had the ability to automatically offset points in an exclusion zone for some time. The user typically enters a number of parameters on the Miscellaneous Settings dialog that
defines a series of moves to make in order to offset each point. Up until Version 2007.3, these moves were approached as a series of inline and crossline steps that started near the original
point location and progressively moved outward until the point fell outside the exclusion zone and other criteria (such as proximity to other points) were met.
A new automatic offset technique was added in Version 2007.4. This was added as a result of input from clients such as Steve Overmeer with Destiny Resources. As described, survey companies
are often provided rules by which a point is to be offset. For example, if a point must be offset, the first acceptable location might be 100 meters (or feet) offline and 0 meters inline.
Failing that the point is to be offset 200 meters offline and 0 meters inline. These rules could continue for a number of possible offset locations. In fact, some rules sent to our offices
showed several dozen possible locations. These offset guidelines were laid out graphically somewhat like the numbers on a bingo card and thus the name.
With the requirements above in mind, QuikMap was modified to include this method. QuikMap will test every location in sequence remembering all locations which fell outside the exclusion zone
(after applying both the tolerance and proximity tests). It will then cycle through all of these possible locations and return the one with the minimum radial distance from the original
location (minimum offset).
This addition includes a graphic tool to allow the user to create a small template file which is used by the automatic offset process. Offset locations are defined by inline and crossline
values. The user can prioritize the offsets by moving them up and down a listing. There is also provision for importing a CSV file containing the offset locations. There is no real limit to
the number of offsets that the process can utilize.
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Fold analysis SPS X file
At this point in time, you can only make simple X files with GPSQL. When you use the utility in GPSQL, you are prompted for two queries. The first should be the sources, the second,
receivers. GPSQL will write records that will consist of a source followed by the start and end station of a track. There will be one record for each track. So if you had 1000 sources and 20
distiguishable tracks, the X file would have 20,000 records.
You may see the ability to write X files with greater complexity in future versions, but for now, it is normally expected that this file comes from the design Geophysicist using a tool like
Omni or Mesa to create it. The Fold Analysis utility does have options for converting an I-O System 2 ASCII Script file (binary or ASCII), or an ARAM script file (*.PRJ) to a SPS X-File')
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Interpolating specific stations
Q - I was looking to interpolate a half station on every forth station. Ex 101.5, 105.5, 109.5.
A - You could interpolate all then write a query to isolate just what you want. The query at the bottom would take a station number, subtract 10.5, and then divide by 4. Only those that were
evenly divisible would be returned by the query.
Here's the query. Just cut and paste. (If you are doing this in QuikMap, display the points in the spreadsheet, write a query like below, and elect to turn the query points hit.)
Select [POSTPLOT].* From [POSTPLOT] Where (([POSTPLOT].`Station (value)`-101.5) MOD 4=0)')
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Finding interval outliers
Don't be confused and use the Proximity utility for finding large intervals along a line. Do the following.
1) Input your file, or in GPSQL, select your query and send this query to QuikMap
2) Select 'Sort' from the File menu.
3) Select 'Outputs' from the File menu and press the 'Report' button
4) Here you will have a spreadsheet of the distance intervals between points. You could query out those that are greater than a certain value.
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Transforming a DEM
Q - I created a local geoid model using QuikMap. The location of input geoid heights was in Transverse Mercator grid coordinates. I completed a DEM-transformation in order to get a model
referenced to the WGS84 system. During the transformation, a message was displayed about rotation error etc. and I answered YES to create the XYZ file. Now, can I use the output GRD-result
file as a local geoid model in GPSeismic, or do I have to do something more with the XYZ file wich is contain WGS84 Lat/Lon values in this case?
A -When QuikMap version 2006 transforms a DEM, it only transforms the header and leaves the data grid alone. This means that any scaling or rotation in the transformation will be averaged
across the DEM. Knowing this, an option was presented to report the computed rotation and create an XYZ file of the transformed cell coordinates so that a new DEM could be created from that
ASCII file via the Regular XYZ conversion feature.
In version 2007, we have completely re-written the DEM transformation routine and now perform the full transformation (header and grid) in one step.
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Removing Duplicates
There is a way to remove duplicate points in QuikMap by sorting the data and finding out where the difference in consecutive station values is zero:
1) Open your file SP1 file containing duplicates on the initial layer.
2) Choose File-Sort.
3) Choose File-Outputs and press the 'Interval Report' button in the Outputs dialog
4) In the spreadsheet choose Query-Build New Query, and build a query where the criteria is '[INTERVALS].`Change` = 0'. Then display that query via the first toolbar button.
5) Choose File-Turn Current Query Records Hit.
6) Once the spreadsheet closes and you are viewing the map, press the 'delete' key to be prompted to delete the Hit points (your duplicates).
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QuikMap FAQs
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Isolating points with a SHP file
If you have a file of coordinates and a polygon Shp file, you can isolate the points inside the polygons in the following manner:
Import your preplots into QuikMap. Then go to the image menu and load the SHP file. Go back to the Image menu and select layers. Right click on the SHP layer and create an XZO form the SHP.
Import the XZO using 'Begin Batch Search' from the Search menu. The points inside will turn red. Go to Outputs in file menu and save the red points.
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Do you have training videos?
A - We have the following videos.
QuikMap - Interpolating Points - Advanced Mode (10 MB)
QuikMap - Interpolating Points - Basic Mode (6 MB)
QuikMap - Obtaining Consecutive Station Information ,aka, Interval Report (4MB)
QuikMap - Comparing A Preplot File To A Postplot File (4.8MB)
QuikMap - Moving A Single Point (6.3MB)
QuikMap - Moving A Group Of Points (5.3MB)
QuikMap - Finding Points Within A Specified Color Of A Raster Image (1.8MB)
QuikMap - Auto offsetting points from exclusion zones (7.5 MB)
QuikMap - Creating Addbacks Using A Pattern File(1.3MB)
QuikMap - Creating Exclusion Zones Dynamically(6.2 MB)
QuikMap - Creating Exclusion Zones Interactively(7.4 MB)
QuikMap - Proximity Testing(6.2 MB)
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Moving points and changing track
Q - I am competent in QuikMap and the use of grid definition files and how they are used to change station numbers when you do group traverses. But how do I change only the Track and not the
Bin when I have to make both an offline and inline change?
A - Make the cross line move in one step and elect to change the stations to their new numbers.
Make the inline change as a second step and elect not to change the numbers at all.
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Interpolating w/selected points
If you had full and half stations and want to interpolate just the whole stations but utilize both whole and half in the interpolation process, it can be done in the following manner:
1 ' Import file into QuikMap
2 ' Select 'Sort' from File menu
3 ' Use Home and end to select line for interpolation. Use station number method
4 ' On interpolation dialog, enter '.5' for interpolation interval
5 ' Interpolate
6 ' Process interpolated points thereby making interpolated points the secondary layer. If we can now get rid of half stations, we are done.
7 ' Select 'Outputs' form File menu. Select interpolated points and select the spreadsheet option.
8 ' In the spreadsheet, build a query with one criteria, that being [SECONDARY].`Station` Not Like '*.5*'. Since the station is a string, we can basically say that we want all stations, but
not those that have '.5' in it. Remember to surround this with asterisks. Execute this query and what's left in the spreadsheet are all whole stations.
9 ' Build a custom report from the spreadsheet. A comma delimited file is fine. Make sure titles are turned off.
10 ' Exit spreadsheet. Remove secondary points using that item on the Edit menu.
11 ' Import the comma delimited file as secondary layer.
12 ' Use 'Append Secondary Points To Initial Layer' on the Edit menu. You now have what you want. Return to Outputs on File menu and make your file.');
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Raster Hit Test
Q - Is it possible to calculate the distance a raster hit point falls within the raster search zone? And can you output the hit point station number and distance within the raster search
zone?
A -The best way to achieve what you're looking for is:
1) With your point file on the initial layer, perform a raster search.
2) Configure the auto-offset parameters to perform small steps, say 2 meters inline and crossline (note that the auto-offset logic will reach out a maximum of 100 steps both inline and
crossline if necessary).
3) Perform auto-offsets across your dataset via the polygon capture method.
4) Save the initial layer to a new file.
5) Clear all.
6) Open the original file on the initial layer.
7) Open the new offset file on the secondary layer.
8) Go to File-Compare-Offsets to perform an offset analysis.
9) Go to File-Outputs and create an offset report.
This report will list specific offset distances from the original locations along with station names and can be output in a variety of formats.
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QuikMap FAQs
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Combining and sorting files
Q - I have a number of postplot coordinate files that I have to combine and sort. Then I want a listing of offset comparisons between this file and a preplot coordinate file. In the old days,
there used to be a program called QuikSort for doing this, but it doesn't seem to be part of GPSeismic now. What do I do?
QuikSort was one of several utility programs which were launched by a program called DMPU. Every one of these utility programs have been incorporated into other GPSeismic applications. If you
need sorting and comparison capabilities, you will now use QuikMap. Here's how you would accomplish what you want to do:'
1) Place all your files you want to combine into one folder as you would have in the past. You might want to keep source and receivers in separate folders (again, as you would have in the
past) and repeat the steps below for each.'
2) Select the QuikMap File menu item, Combine. From this dialog you can use the second tab page to combine all files in a folder into one file.'
3) Import the file created above into QuikMap as the initial layer. Select the File menu item, 'Sort'. If, at this point, all you really wanted to do was to create a sorted coordinate file,
go to the File menu item, Outputs, and create a coordinate file in the desired format. Also, if you want a consecutive station report, you can press the 'Report' button from the Outputs
dialog. This will display a spreadsheet of the consecutive data from which you can write a query displaying exactly the consecutive station information you need.'
4) Import your preplot file as the secondary layer. Then select the File menu item, Compare/Offsets.'
5) Select the File menu item, Outputs, and press the Report button. IMPORTANT - On the small dialog this action displays, check the box that indicates that the postplots were in the initial
layer. Also, make sure the grid azimuth of the lines is entered here since offset inline and crossline values are dictated by that number. Once the spreadsheet is displayed, a query of the
specific fields you want, along with any other record criteria can be built.'
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Adding on to an existing prospect
An addback utility in QuikMap allows the user to create points in a user defined polygon. You would import your prospect into QuikMap and then a grid definition file for the same. You can
optionally import an image if you need one to help define where the additional prospect is to be created. Note that since the grid definition file dictates where additional points are to be
created, this can be any type of grid, including odd/even (Canadian) grids. You now lasso the area, right click and elect to create addback points on the popup menu. Doubleclick and like
magic, you are done.
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Can't Rebin Stations
If you import points into QuikMap, then open a grid definition file, you have the option of rebinning which is the action of renaming all stations based on where they fall in the theoretical
grid. If you find that no stations are rebinned, yet you know they should be, this means the change in numbers is so great, that QuikMap believes they might be receiver points and not source
points.
Go to the Miscellaneous Settings dialog. Go to the Program Settings tab page. The top text box (Maximum offset for binning logic) should be changed to a much larger number. Then try rebinning
again.
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Large DEMs
Q - I am having trouble using a DEM. The reformatted version 7/8 surfer grid is 800 mb. I get a 'unable to allocate enough memory...' message. Any idea about how to downsize the surfer grid
or avoid this problem.
A - There are two methods, both located on the DEM dialog. The first is to 'extract a sub grid (graphical)'. In this method you select an input DEM and specify the name for an output DEM.
Press OK and you will get the a dialog with a graphical representation of the DEM. You drag a box to create the sub-grid that you want so its best to determine the grid extents you need
before you do this.
The second method is to create evenly spaced tiles. Yo need to specify the input DEM. When run, you get a dialog showing a graphical representation. You specify the number of tiles from the
drop lists followed by a press on the Refresh button then OK.');
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Using JPGs for raster search
QuikMap has the ability to use a raster image like it does an XZO file. That is, if a point is determined to be touching a specified color, the point will be turned to 'hit' status. This is
useful if, for example, you are given a registered raster image containing exclusion areas in a specific color.
 However, JPG compression is notorious for smearing colors. In this closeup of a JPG you can see what at a distance is a fairly
distinct object. For simply depiction, it really doesn't matter, but for the raster search operation, it's a big problem. When you select your colors for the raster search in QuikMap by
dragging a rectangle, the program stores all colors that were found in your rectangle in memory. When performing a raster search it determines the color (RGB value) of the pixel under each
point and sees if it matches any of the selected colors.
The smear is easy to detect over an image, not by eye, but by slowing moving your cursor across the image. You will see that the cursor status changes from inside to outside and vice versa
over what appears to be the same color region. Actually, the colors are changing ever so slowly to the point where at some pixels, they are no longer part of what was originally selected.
Due the this color smear, JPGs should be avoided for a raster search. The preferred format for this operation is TIF LZW. This format has the benefit of comparable JPG compression levels but
with no color smearing whatsoever. This is the format that QuikMap uses to save tracking DEMs for example.
So, if you are creating a raster image from a SHP file in QuikMap, after you ensure that the lines and fill colors are the same and the fill type is solid, go to the Layers dialog and choose
Save/Convert. Make sure you select the Convert to Raster option from the file type list and enter a name for the TIF file. Then adjust the image size to a reasonable value and press OK. A TIF
LZW file will be created with no color smearing. This file is then ideal for use in the raster search operation.
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