# Tag Info

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 ...
• 1,927

### 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 ...
• 4,434

### 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" -...
• 16.3k
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 ...
• 3,240
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 ...
• 2,326
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 ...
• 31k
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 ...
• 31k

### 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 ...
• 31k

### 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 ...
• 10.1k

### 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, ...
• 1,622

### 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).
• 4,500

### Calculating volume of fill needed using QGIS

Solution: reproject You use a CRS that is not suitable for measurements. Reproject to a local CRS (do not simply "change"/set the CRS), e.g. the UTM zone valid for your area of interest. See ...
• 73.2k

### 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 ...
• 30.1k

### 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 ...

### 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 ...
• 15.7k

### 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

### 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
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:...
• 1,699
1 vote
Accepted

### How precise is a volumetric calculation made with satellite stereo par imagery?

I have seen providers state accuracies around 20cm between two subsequent elevation datasets covering the same mine. Such accuracies require a significant number of calibration points from the site, ...
1 vote

### Calculate volume of MultiPolygon Z using Postgis

As per ST_Volume documentation, you should make your objects as POLYHEDRALSURFACE, then convert them to solids with ST_MakeSolid and then use ST_Volume on that. By my knowledge there is no way how ...
• 1,353
1 vote

### Converting road segments into one full link and taking mean of traffic volume

This can be mostly resolved with a simple dissolve. This is your starting situation: Line direction is indicated by arrow, lines are labelled with volume and green points are the end nodes of a line ...
• 43.9k
1 vote

### sfcgal ST_Volume Issue

Not really an answer but a workaround: Changing the TINZ prefix in the input data file to POLYHEDRALSURFACE Z then works with: ST_Volume(ST_MakeSolid(sd.design)) Maybe there are some polygons ...
• 121
1 vote
Accepted

### Comparing DEM volume using GRASS

The difference of two rasters, before and after, can be produced as a new raster with r.mapcalc (rasterDiff= rasterBefore - rasterAfter). Then, you can have the volume by using the r.report of ...
• 3,240
1 vote

### 3D Points within 3D Polygon in PostGIS

I played around with some test setups a while ago; it seems ST_3DUnion, ST_3DDifference and ST_3DIntersection work on Volumes; you could try sth. like this: WITH volume AS ( SELECT ...
• 30.5k
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 ...
• 65.3k
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 ...
• 10.1k
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 ...
• 7,091
1 vote

### Estimation of volume from DTM

2017-03-03T21:00:43 0 SAGA execution commands io_gdal 0 -TRANSFORM 1 -INTERPOL 0 -GRIDS "/var/folders/gj/24tjnl3d5q1cbmf8qrzp5l080000gp/T/processing09437b37ce8c4b63aa9d22ecc2283762/...
• 305

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