7
votes
Accepted
How to measure volume in raster?
The best way I've found to do so is to use a combination of the raster calculator and zonal statistics.
You first need to calculate the difference between the two rasters, using a filter to get ...
- 1,917
5
votes
Estimation of volume from DTM
Using QGIS 2.18.3, it seems to work fine.
I set the "County Only Above Base Level", with base level equals to 0 and I get this log:
Algorithm Raster volume starting...
grid_calculus "Grid Volume" -...
- 16.1k
5
votes
How to measure volume in raster?
A very fast way to get the volume with some python code and gdal2xyz.
You have to calculate your difference raster only. Don't care about positiv or negativ value, we will distinguish between them ...
- 4,394
5
votes
Accepted
How to restore a scarp surface grid to calculate material loss
I will try to address your question with GRASS.
Your problem has a first task that is a bit challenging already, which is to get the situation before the event you want to quantify. I think the best ...
- 3,210
4
votes
Accepted
Cut Fill Tool in QGIS?
The raster calculator can give you the difference between the original DSM and the new DSM. DSM_o minus DSM_n = DSM_cut-fill. You can then run saga raster volumes in processing to get the volume below ...
- 2,284
4
votes
Accepted
Volume of a raster
SAGA Raster volume with [0] Count Only Above Base Level option (Base Level= 0) will be fine.
If you are unsure about the output value, please ensure your CRS is in line with your expected output ...
- 30.5k
4
votes
Accepted
Elevation and Volume relationship curve in QGIS
You may not believe it, but you can use QGIS Hypsometric curves tool (in Processing Toolbox > Raster terrain analysis) exactly for this purpose.
Please do not forget to reproject your map to a CRS ...
- 30.5k
3
votes
calculating a volume from points
In ArcGIS-Create a polygon that represents the outer boundary of the reservoir. Give create a new attribute in that polygon (say 'z') and populate the attribute wit the elevation. Feed the points (as ...
- 9,394
3
votes
Calculating the volume between two interpolation layers in QGIS?
The first step is to define a grid resolution (g.region) and then convert your points to rasters with v.surf.idw. Check that the rasters look OK. Sometimes interpolating introduced artifacts. Then, ...
- 1,630
3
votes
Interpolating bathymetric data to make a volume estimate
You are drawing a wedge through the hummocky splooge. The methodology is fairly crude, but without a "before".. you are just guessing so why waste a bunch of time.
The points you proposed to create ...
- 718
3
votes
Measuring Volumes using DEMs
QGIS can use the GRASS GIS and SAGA GIS tools that solve the problem (example uses GRID VOLUME by SAGA GIS from processing).
- 4,375
3
votes
What is result from cut fill operation?
The negative volume is the amount of dirt you have used to fill the hole in projection units and your chosen z unit. In your case it is the amount of fill needed to fill the lake. So if x y z are ...
3
votes
Accepted
'Result' object has no attribute 'GetMessage', ArcGIS Example
For a results object the punctuation is slightly different than the GetMessage method.
print result.getMessage(0)
- 13.8k
3
votes
Calculating Volume differences between two DTM from different years with QGIS?
The usage of SAGA raster volume is slightly different from what you would expect with ArcGIS Cut/Fill, as it is a tool to calculate a volume above a reference surface.
How about simply using QGIS ...
- 30.5k
3
votes
Calculating volume of fill needed using QGIS
Solution: reproject
You use a CRS that is not suitable for measurements. Reproject to a local CRS, e.g. the UTM zone valid for your area of interest. See also here for backround.
Details: why you get ...
- 67.1k
2
votes
Calculating Cut & Fill volume using ArcGIS Desktop?
Use a projected coordinate system suitable to your region. UTM is common for this. Those units appear to me to have been generated from:
x=decimal degree
y=decimal degree
z=your layer units such as ...
2
votes
Calculating volume with Cut Fill tool in ArcGIS Desktop?
If you want to calculate the sum of cut and the sum of fill do the following:
Go to the attribute table of the layer
Sort the rows by volume
Select the rows with minus (i.e. fill) (highlight them)
at ...
2
votes
Measuring volume using DSM instead of point clouds in Pix4D
here's some good news for you!
In the latest version of Pix4Dmapper, the volume is calculated based on the DSM if the 3rd step - DSM and Orthomosaic generation is done. This is done by default, and ...
- 21
2
votes
Calculating the volume between two interpolation layers in QGIS?
Assuming that borewells’s elevations (in my example a constant raster with value 2000) and elevation of the bottom of the first geological layer (in my example a DEM raster) are two rasters with the ...
- 29.6k
2
votes
Calculating volume using polygon instead of contour line in ArcGIS Desktop?
I assume that what you call “DEM of the lake” is DEM of lake bottom and surrounding area.
If this a case, it is a few steps procedure main ones being calculation of lake bank altitude and average ...
- 22.6k
2
votes
calculating a volume from points
I don't really have much experience with doing this sort of thing, but I have a few suggestions.
If you have a DEM, you could try the QGIS/SAGA GIS Grid Volume Tool on it with the method set to 1 and ...
- 81
2
votes
Calculate volume from raster (GRASS) with depth per cell
Are you aware that the output from r.clump does not have the depths? Each clump is given a unique category value, so you no longer have the cell depths. You can get the area of each clump, but not the ...
- 15.5k
2
votes
In DEM data there the elevation ranges from - 156 to 3877. What does this mean?
The datum for most elevation is set at sea level. If you have a negative number in a DEM this usually refers to below sea level. An example of this would be Florida. Let me know if this helps
- 358
2
votes
Elevation and Volume relationship curve in QGIS
Just came across a Youtube tutorial by Hans van der Kwast.
Basically he used a pyQGIS script to iterate a series of elevations, at each iteration the script uses "Raster Surface Volume" to ...
- 21
2
votes
Accepted
Building a table from for loop values in QGIS
Try:
from qgis import processing
with open('/MY_TABLE.CSV','w+') as summary_csv:
for level in range(169.49,170.00,0.01):
'lake_level'= (level+0.01,level)
processing.run("qgis:...
- 1,629
1
vote
Change Detection in ArcGIS Desktop?
As commented by @MichaelStimson:
The difference between the rasters, or more correctly the absolute
value, represents the volume. Assuming you have both 3d and spatial
analyst license: Create a ...
- 65k
1
vote
How to restore a scarp surface grid to calculate material loss
I am trying to calculate the volume of ore that has been excavated in an open-pit mine, using QGIS and GRASS. I used the same method suggested here except for the step 7.
To calculate the volume of ...
1
vote
In DEM data there the elevation ranges from - 156 to 3877. What does this mean?
You could use RASTER CALCULATOR to identify cell(s) containing suspicious values. You could end up realizing that odd value(s) are not that odd after all. For instance, I happen to deal with an area ...
- 1,536
1
vote
In DEM data there the elevation ranges from - 156 to 3877. What does this mean?
What area does this DEM cover? Is this a combined surface model and bathymetric data set? Is this data from someplace like Death Valley California or near the Dead Sea? If so you should expect some ...
- 9,394
1
vote
Volume Calculation for non-closed geometries in postgis
As a main drawback volume-calculations with use of the typical functions in postgis is not possible (neither for one part of the building nor for the whole building). The dataset I’m talking about can ...
- 7,031
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