Tagged Questions
1
vote
1answer
61 views
How to apply DEM elevation adjustment parameters?
I have a nice DEM, created from UAV data, which I want to process further in QGIS, my platform of first choice. In order to represent the evelation of each pixel correctly, I have to adjust the ...
4
votes
1answer
79 views
What functionality exists to calculate Cut and Fill for excavation?
Does qgis have the ability to compare and quantify existing versus proposed elevations?
0
votes
0answers
21 views
How to extract elevation data from DEM along a polyline [duplicate]
I've been trying to use qGIS to extract and save as an attribute the data elevation along a line, knowing that something similar is available in ArcGIS using the Spatial Analysis tool. So far, ...
1
vote
1answer
71 views
Which horizontal unit is used on the table of the Profile Tool?
Does anyone knows what horizontal unit is used on the table of the "Profile Tool".
Vertical is in meter but I don't know about the horizontal axis.
Knowing the length of my profile, I tried to divide ...
6
votes
2answers
386 views
Elevation profile 10 km each side of a line
How can I get an elevation profile for a band of terrain?
The highest elevation within 10 km (on each side of the defined line) should be taken into account.
I hope my question is clear.
Thank you ...
2
votes
1answer
165 views
Orthogonal Height Profile along line (sextante -> v.segment, r.profile?)
While trying to find a way to find "valleys/ridges" within a DEM, I'd
like to know if there are tools, plugins or "methods" known or
available to automatically generate height profiles along a given
...
3
votes
2answers
286 views
Exporting DEM-derived rasters to CSV from QGIS?
I have been able to import into QGIS a set of raster topographic maps and the associated DEM raster maps. It registered the two for me. From there I have calculated the associated slope raster map. ...
9
votes
3answers
392 views
What are common methods for converting raster digital elevation data to vector contours?
In researching this I have found many references to the opposite, creating elevation data from contours, but nothing regarding contour creation. Preferably, I am looking for open source solutions like ...
4
votes
5answers
456 views
Elevation correction ASTER GDEM2 (+10m)
My ASTER GDEM2 has a average elevation error of -10m for my area. (I testet it using 90 defferential GPS reference points and compared it with old Topo25, SRTM, and GoogleMaps).
I would like to ...
1
vote
1answer
420 views
Why does QGIS Profile from Line tool give me the same value for every point?
I'm trying to make an elevation profile with QGIS's Profile from Line plugin. But when I do, the resulting points all have the same value: -32,767. I'd like to know what I'm doing wrong.
My elevation ...
0
votes
2answers
259 views
Why does only one of three elevation rasters display correctly?
I downloaded a selected sub-set of the USGS National Elevation Data (NED) using their online GUI. This download came in the form of three files.
The names of the files are 61471006, 61471006_2, and ...
1
vote
0answers
235 views
How to create a profile with profile points at discrete altitude intervalls, e.g. each 10 m
In both SAGA and QGIS theres a profile-from-line-function that does a nice job of creating profiles. But there's no way to control the altitude spacing.
Any ideas for workflows that would allow me ...
1
vote
2answers
545 views
How to get the altitude of the vector shapes from DTM raster layer?
I have a vector layer containing thousands of vector shapes/polygons and a raster layer with DTM. Every shape has its own OBJECTID in attribute table. I would like to get the altitude of every shape, ...
