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New User Question Regarding Data Files

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    Dick West

    I am a new potential user also and have not downloaded the surfer yet.  I am a Oasis Montaj user though.  How did you convert the inches to feet (or vice versa) - within surfer or in another program such as excel?  If you provide a data set of xyz data, the gridding routine will generate a grid that covers the same area as the data (with potential holes in the data being filled with extrapolated data).  Sounds like you created a grid with surfer or did the error occur before the gridding routine was completed?

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    MSR

    Hi, the issue was figured out but still trying to resolve several other new things. Mainly with a help of a co-worker we were able to realize in Surfer the "Y" Axis is actually the "Z" axis...Also we needed to save the Data file and reload in the Grid Options Menu, this was in part some of the problem. Now I am onto figuring out on how to cut the model off by drawing to scale in the program (cutting with a polygon boundary was pretty easy given one tutorial provided), would love to know how to change the boundary elevation so I don't end up with contours running off the outline if that makes any sense. We are trying to display depressions in a floor so most of the boundary would be even except for some areas recorded where depressions were found along the boundary.

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    Dick West

    Glad you got past the first issue.  I am glad they have a polygon boundary that one can use to limit the data boundaries.  So the polygon you used was only for the map making and not the gridding and contouring process?  Sorry but I am looking to sign up for a free trial this week but not there yet.  Looks like the user community does not use this site very often at all and evidently there is not a Golden Software person that is dedicated  to answering or providing advice.  I would be interested in a community where people can share tips and tricks and also mathematical expressions to manipulate the data for special applications such as geophysics.  One suggestion is to provide an image showing a problem you have since a picture is worth a thousand words

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    MSR

    Hi, they have a polygon boundary that you can use to cut out parts of the map you create, however seems to be limited on two axis vs. three so I am not sure how you would set a Z coordinate on it to create a map where you would want a defined boundary to be set at a certain height where your plotting points can be unilaterally set to a certain coordinate if this makes any sense.

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    Dick West

    If I remember correctly you can specify a maximum value for your z value (elevation) during the gridding process - that will limit the values to those less than the max.  does that solve your issue?

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    MSR

    I am not sure, I would have to see if this option is available when loading the Data File. When drawing the Polygon Z option is non existent.

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    Clayton Bruntz
    Hello MSR and terracognito,
     
    Thank you for your comments and input! I am happy to hear you solved your original issue, MSR. As terracognito said, you can limit your Z value range maximum and minimum when creating a grid. I have provided details on how to do this below. The best way to get quick responses from our support team is by emailing us at support@goldensoftware.com as we do not monitor the forum closely. If you have any questions, please let us know!
     
    When you are gridding data, the gridding algorithm can calculate a Z range for the grid that extends beyond the Z range for the original data file.  However, you have control over this using the Grid Z Limits section on the Output page of the Grid Data dialog.
    You can allow the gridding method to determine the Z range in the grid, you can tell Surfer to match the Z range in the grid to the Z range in the data file, or you can enter a custom value for the grid Z range.

    For example:

    1. Click Home | Grid Data | Grid Data.
    2. In the Grid Data - Select Data dialog, click Browse in the DataSet 1 field, select the data file to grid and click Open.
    3. Select the Gridding Method and the X, Y, and Z columns.
    4. Click Skip to End.
    5. On the Output page under the Grid Z Limits section, you can choose how you want Surfer to calculate the grid's Minimum and Maximum Z value. You can use different selections for the Minimum and Maximum (e.g. you can set Minimum to Custom and leave Maximum set to None). The options are:
      1. None. This allows the gridding method full control over calculating the Z minimum or maximum.
      2. Data min or Data max. This tells Surfer to use the minimum or maximum Z value in the data file as the maximum and minimum Z value in the resulting grid file.
      3. Custom. This allows you to specify a custom minimum or maximum Z value for the grid file. For example, if you know that there should be no negative values in the grid file, you can enter 0 as the Custom value for the Minimum.
    6. Click Finish and the grid is created with the Z range specified.
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