Best Insightful Content

• Error message

try by deleting the ">" sign from the name

• Measure Volume Between Surface of Waste Rock Dump and Uneven Topo at Incremental Intervals?

I feel your pain! I model Dry Stack Facilities and Tailings Dams and have to perform a stage storage analysis quite often. These days I use mining software but I used to do this in Global Mapper. In a nutshell you have to run the volume analysis twice against a common 'comparison surface'. So in essence you are computing the volume between the terrain and the plane; and then the dump upper surface and the plane. You then subtract one from the other.

I take no credit for this - please see this site for the general principle: https://ceethreedee.com/?s=stage+storage

I have attached my notes from back in 2016 for your reference. Please see the Excel spreadsheet I have embedded in the Attachments panel on the left. Right-click on the attachment and hit open or save. If I recall you just paste the values into the green cells and it will do the rest for you.
• Variable width corridor for path profile?

Why not creating a surface from your trapezoid shape and extract the Terrain underneath?
Assuming your polygon is a 3D height evaluation  surface of course.

• Flood Simulation using GM 22

You can do the following :

Digitize the water surface and add elevation from terrain to resulting vector.
Or just digitize the river centerline add elevation and use a small buffer value to create an area.

Select the 3D polygon and use Water Rise Function.

Use desired parameters and repeat the simulation with your increment

Result

• Variable width corridor for path profile?

Hi Jo, perhaps a simpler way to go would be to crop your terrain to the trapezoidal shape in question and then use contour max/min tool to show highest point within shape? Alternatively you could use the show water level tool to highlight highest point(s). Might be simpler. I've attached a few screen shots...

(Screen shot #1 shows terrain, #2 cropped to shape and then #3 with high/low spots using contouring tool.  #4 is with the "Shows water " tool turned on - I use this tool a lot! for flood inundation studies).

Cheers,
/al

• Variable width corridor for path profile?

Hi Jopacak. Wow, tricky question!

As you have probably already noticed the "Distance from Path" under the Path Profile Settings menu is fixed and will only allow sampling at a fixed offset either side of your central corridor.

If I had to do what you are asking (and I hope I never do! <span></span>) I think I'd do it iteratively by increasing the length of the Perpendicular Profile as you move along the central corridor (in your case from SW to NE). I'd then view each cross-section and right click on "Show Path Profile Details" to see "Maximum Elevation on Path" and copy to clipboard if required or if I needed x,y,z of highest point I'd right click and select File/Save CSV File  and then bring into Excel say and pick maximum elevation point using @Max command.

Its a bit of pig of a thing to have to do, but that is what I'd do as a workaround. I've attached a few screen grabs of an example. Hope this helps.

Ta,
/al
• Is there a way to split large vector layer into small layers by number of features?

Hi!
Open your layer's attribute table. Find the <Index in Layer> field in the table

And create a query like this:

In my case, there are much fewer objects in the layer.
Next:

Then proceed in the same way.

• Map layout editor

Hi Jan,

It sounds like you haven't discovered the Map Layout Editor button yet (select icon to left of "spanner" on File tool bar or bottom selection below "Tools" dropdown menu). This editor allows you to set up A1, A2, A3 etc. size drawing/figure sheets with windows automatically to scale (use insert Map View Element), also to paste in Word details (use insert Text Element), coordinate grid frames, image files, scale bars, north arrows etc.  If you need an overview map for your figure you can create it in the normal workspace view and then insert it as an image on your figure.

Once you get your head around it you can set up standard template files for your business or project e.g. Portrait A4, Landscape A3 etc. with title box, logo etc. I've attached an example of what I mean.

Further details are available under GM Help (search up "Map Layout Editor").

Cheers,
/al
• Combine elevation data

I struggled to understand the Combine/Compare Terrain function so made this visual guide years ago. Hopefully it will make it easier to understand than their description.

You can also physically place them on different layers and feather the edges of the uppermost layers to blend the edges seamlessly. Then export out as a new dataset.