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  • How do I get surface area of 3D shape?

    Hi dwsf, select bounding shape around toe of dump (or crest of pit for that matter) and right click to select Analysis/Measurement and then select Pile Volume. Done. See attached screengrabs 1 & 2.

    Cheers,
    /al


    dwsf
  • Drape polyline to TIn

    Did you find a solution in the end? If not, here is a workaround:

    1. Convert the Polyline to an Area Feature
    2. Select the Area Feature
    3. Export the TIN mesh to DWG/DXF using the Area Feature as the Export Bounds (Crop to Selected Area Feature(s)
    4. Import the cropped mesh
    5. Select it
    6. Right-click > Crop/Combine/Split Function > COMBINE
    7. Repeat if any areas remain
    8. Select the combined Area Feature > Advanced Feature Creation Options > Create New Points from Selected Area and Line Features

    Your Area Feature and the Points will be an exact match to the TIN mesh and the vertices are only created where the original polygon intersects the TIN mesh. This workflow does not require you to generate a gridded terrain.

    Cheers,
    Steve



    CarrickCon
  • Combine elevation data

    VincentR said:
    Thank you, @sphillips ! That is a very clear presentation of the Combine/Compare terrain options, very insightful!!!

    With your overview of the operations it is quite clear that what I need is not included in the options for v21.1.
    I took some markers and drew the update/replace operation similar as you presented in your visual guide (the result is however not as neat as yours ;))



    The top drawing is the original separate layers A and B.
    The second is the combined layer where A replaces B.
    The third is the combined layer where B replaces A.


    At the bottom three models in topview:
    • Left are the individual layers before combining.
    • Middle is the combined layer where A replaces B
    • Right is the combined layer where B replaces A

    In words: A updates/replaces the values in B. If there is no value for A, value of B will be used.


    When working with bathymetry, this is a very common operation to perform, e.g. when surveys are executed on different dates.
    An update/replace layer operation would be a very welcome addition for me to the Combine / Compare layer options.
    Do you have any sample data to test (or zip a GMP)? Can you just load the layers and place B above A (or vice versus as required)? Then export them to a new dataset?
    VincentR
  • EPSG visible in Projection display

    Hello,

    We have an open request (GM-9327) to add the EPSG code to the Projection window. It is currently in the queue for Global Mapper 22, but that is not a guarantee that it will be included in that release. I have added your information to the feature request to indicate that another user is interested in this functionality. Thanks for the suggestion.

    Cheers,
    Bob
    VincentR
  • Select cropping area feature

    Hello,

    We have added feature request GM-11190 to our task list. Thanks for the suggestion.

    Cheers,
    Bob
    VincentR
  • Intersecting Contour lines

    It's likely related to your simplification settings or enabling smoothing or both.
    alienyouth
  • Create elevation grid - Inverted values

    There is a far simpler & better way of doing this. Open the Options dialogue for the elevation layer (double click or right click on the layer in the Control Panel). Select the Alter Elevation Values tab and change the scale factot to -1.

    Done

    sphillipsVincentR
  • Generate OziExplorer .map file without rendering the complete map

    Hi, jrm456!
    Here is an example map file.Open it with a notepad and replace the coordinates of the anchor points with yours. 
    https://yadi.sk/d/BLfiPZDNZlb2Yg
    jrm456
  • Digitize Line in Profile View

    Hello: I quite agree with this need. A manual ground profile estimation by means of this human guided interpolation would be great. I'm right now facing the very same case and it is taking ages to select points and assign ground class, while it would be a lot faster and simpler to draw a low-pass line...
    946Engialfa
  • tools for calculating volume

    curves said:
    I have been experimenting with certain tools to calculate the volume of water in potential dam sites. I have been using the 'pile volume' tool which gives an array of feature information including varied data on volume. when I calculate the volumes using mathematical formula I get a very different answer than that given by the pile volume data. 
    Is this tool accurate and reliable for this type of calculation? Is anyone using this tool for the same purpose? Can anyone shed some light on why there is so much variation in calculation methods?

    Many Thanks
    Bruce Kirk
     I'm not sure what "mathematical formula" you used for confirmation but before I started using GIS extensively, the normal method was to use your contour map to compute the area and the elevation of the contours within the reservoir area, then apply the conic or end-area method to compute the volume between the contours and cumulate for the entire reservoir. Usually we ended up with a plot of the Height-Area-Capacity curve to show the characteristics of each potential site.

    My current work flow using Global Mapper involves:

    1: Generating the contour map using the DEM and creating an area feature of the reservoir at the desired contour elevation.






    2: Select the area feature and initiate the volume command


    3: Choose the "Perform multiple calculations over a range of base heights" and enter the lowest and highest elevations within the area (425 to 440 as shown), then press "OK".



    4: The results are shown below with the highest "fill volume" highlighted as 13,285,150m3.


    5: You can copy to clipboard and paste to MS Excel to generate graphs live below.


    6: If you want to have a more direct volume computation, just do step 1 - 2 and choose "Use same base height value for all vertices", enter the desired elevation (440 here) and ensure the value is selected as "above sea level".


    7: Voila, the fill volume is same.


    I have verified this with the manual method and the volumes are not significantly off.
    curvesVincentREngialfa