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Corrupted Streamlines Contour Map

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8 comments

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    Kari Dickenson

    Hello,

    For that little black box, include a polygon of that box in a BLN file and use the BLN file as a fault file when gridding. Faults act as a barrier to flow, so the grid cannot go through it (and hence the contours won't either), as long as there are no data points within the fault polygon. You might want to see:

    You might also want to be sure you have enough data points for the rest of the grid. The contours on top look a bit sparse on the left side of the grid relative to the bottom grid. I'm not sure if the axes are oriented the same way as the map on the bottom though.

    Thanks,

    Kari

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    dgengy
    Thank You Kari Dickenson for your reply , i have tried what you suggested but as you can see in the attachment the block overlapped the streamlines.
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    Kari Dickenson

    Hello,

    You could try adding the BLN file as a breakline instead of (or maybe in addition to) using it as a fault file. For a breakline file though, you do need a column of Z values for the points in the BLN. So you could click File | Open, select the BLN file and click Open. Then in column C add Z values to each point in the BLN. For example, you could put a bunch of 0's in column C. Then save and close the file. To have the streamlines go up and around the blocks instead of right into it, a breakline is the best bet. More data points around the blocks would also help.

    Thanks,

    Kari

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    dgengy
    I have tried using both breakline and fault file but the results are as follows ( the polygon is just overlayed over the original streamline plot)(i filled the original contours with grayscale gradient so you can see that the polygon is just placed as a layer over the original one and the streamlines goes through it).
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    Kari Dickenson

    Hello,

    You could get the image you show above if the BLN file was used as a fault file when gridding, or if you used the BLN file to blank the grid after it was created. However, gridding the data using the BLN as a breakline file should have the contour lines go around the blocks, not through them. As a tip - increasing the # of Nodes when gridding will decrease the size of that blank envelope around the blocks. If you are certain you are using the BLN file as a breakline file during gridding (in the Advanced Options for the gridding method in the Grid Data dialog) and you still see the image above, can you please email me the data you are gridding and the BLN file you used as a breakline file?

    Thanks,

    Kari

    kari@goldensoftware.com

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    dgengy
    Okay,I've sent you an email with all the files you requested. Thank You.
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    dgengy
    I also tried to increase the number of nodes but still the streamlines goes through the boundaries .
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    Kari Dickenson

    Hello!

    I got your files and just sent you a reply via email. Just to mention it here too though, the problem is that the raw data itself is already on a grid pattern, and shows that the contours would go right into the boundaries (not around them). So Surfer is trying to be accurate to the original data. If Surfer made the contours go up and around the boundaries, then that would be inaccurate to the original data. There are a couple things you can do:

    1. Add more dummy data points around the boundaries so that Surfer could make the contours go around them, not stop right at the boundaries.
    2. Edit the grid after it is created. Minimum Curvature does a pretty good job of making the contours look nice. However, the 0 contour line still is a little abrupt at the boundaries. After the grid is created, click Grid | Grid Node Editor and open the grid in the Grid Node Editor. You can adjust the Z value of the nodes around the blocks so that the contours go around them. Save the grid when finished.

    Thanks!

    Kari

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