49
votes
Accepted
Creating transparent hillshade?
Nutshell
Each set of 3 images below should be read such as "grey (band) + opacity (band) = transparent result". You can test these processes within minutes via the associated github hosted ...
- 2,633
20
votes
Accepted
Hillshade results look too grainy
I think you are using Geographic CRS not Projected CRS. Usually this hillshade output is due to you are not using a projected DEM such as UTM projection with a meter unit. You need first to reproject ...
- 39.6k
18
votes
Accepted
Hillshading makes crater-like depressions look elevated?
It may surprise you to find that most people likely do perceive your hillshaded DEM as containing depressions, however, this is not an uncommon experience. Here is the reason why. Ever since the ...
- 11k
15
votes
Accepted
Remove border lines of SRTM tiles rendered as hillshade
SRTM tiles (3601 px * 3601 px in this case) have 1-pixel overlaps in between. When you apply transparency (or reduced opacity) to your hillshade layer, such overlapping pixels stand out. You may have ...
- 30.2k
13
votes
Hillshade shows grid texture artifacts
The problem is because the DTM has a high-resolution pixel size when data (in my opinion) doesn't have the same resolution is some areas.
For example, direct hillshade raster:
Check pixel values (...
- 13k
12
votes
Where is World hillshade free download?
Three of the first sources that come to mind:
OSM hillshade basemap
USGS NED hillshade basemap
ESRI hillshade basemap (based on SRTM 30m)
Or you could always download the free SRTM 30m data and ...
- 9,745
12
votes
How can I get a blurred Hillshade effect in QGIS?
You can find Hillshade in menu Raster --> Analysis --> DEM (Terrain models)... or in processing toolbox Hillshade.
Blurry effect can be achieved by changing resample method in Style tab in ...
- 6,687
11
votes
Accepted
How to create composite hillshade?
The linked source mention "change its fusion mode to < Multiply >", so the operation to do is not a simple average of input hillshades (for this, see also How to average gdal_hillshades?). It's ...
- 2,633
10
votes
Using processing.runandload in QGIS 3
I think with the new QGIS 3.0, it is much easier to incorporate the input parameters of an algorithm into a dictionary which can then be called using:
processing.runAndLoadResults()
which is the ...
- 74.6k
9
votes
Creating transparent hillshade?
Another way to get the same result of a non-grey canvas more suitable for combining with other layers is the 'combined' option in gdaldem.
It performs a slope and hill shade and combines the two in ...
- 606
9
votes
Accepted
Merging hillshade / DEM data into color relief single geotiff with QGIS and GDAL
gdal_calc.py is a good tool to perform mathematical operations and functions on raster images. The gamma and overlay functions are fairly simple to write and you can string together some temporary ...
- 2,779
9
votes
Accepted
Using processing.runandload in QGIS 3
I followed @Joseph directions and it helps me to see another visions. I opened processing toolbox in QGIS and complete missing parameters. Here is the last version:
import processing
rasterLyr = ...
- 1,531
9
votes
Accepted
Blocky SRTM hillshade in QGIS
Your screenshot depicts the classic blocky "herringbone" pattern resulting from applying a Nearest Neighbor resampling to raster elevation data. The solution is to instead apply either a ...
- 7,759
8
votes
Accepted
Making elevation contours of raster smoother using QGIS
In my case, I have a DEM with continue values, going from 100 to 103 meters. The spatial resolution is 0.25 x 0.25 degrees, defined in EPSG:4326. The DEM is styled with a discrete color ramp with ...
- 13.3k
7
votes
Accepted
How can I get the original DEM from a hillshade raster (GeoTiff)?
There isn't. When one generates a hillshade raster, the height information is transformed into slope information, and that into a hypothetical illumination information. It is meant to mimick how the ...
- 3,101
7
votes
How to create an "arcgis-style" hillshade?
The key to the ESRI hillshade layer is the multidirectional hillshading, according to their blog: https://www.esri.com/arcgis-blog/products/arcgis-living-atlas/mapping/introducing-esris-next-...
- 16.1k
7
votes
Accepted
How to colorize QGIS hillshades without including black tones?
You can't directly use the DEM + style options to generate hillshade + custom colour ramp as try to you do.
You need to generate a hillshade raster (use raster tools >hillshade or the processing ...
- 3,067
6
votes
Where is World hillshade free download?
Just to add to @Kersten's brilliant answer, you can download Elevation maps of Europe which includes 1km x 1km hillshade data:
Additionally, there's also a Global Hillshades compressed raster which I ...
- 74.6k
6
votes
Accepted
Hillshade not displaying correctly in ArcGIS Pro?
You are probably generating your hillshade from a surface model that is referencing a geographic coordinate reference system like WGS84. Re-project your data into a Cartesian coordinate reference ...
- 8,857
6
votes
Making elevation contours of raster smoother using QGIS
There are several tools that exist in qgis to smooth contour lines as opposed to smoothing the raster itself , including vector->geometry->simplify, the vector geometry tool "smooth", and the GRASS ...
- 2,759
6
votes
How to create an "arcgis-style" hillshade?
I highly recommend the Batch Hillshader plugin for QGIS by PANOImagen (GitHub).
It generates a three light exposure composite using the methodology outlined in this paper:
Ref.: Gantenbein, C. (2012):...
- 2,669
5
votes
Accepted
Topographic Position Index unexpected result in QGIS
I think the problem is related to how you change the projection of your data. If the DEM data was originally in geographic projection (WGS84), and not projected to UTM zone 10S, then you need to ...
- 39.6k
5
votes
DEM out of a shaded relief LiDAR?
What you have is a hillshade surface built from a LiDAR point cloud. According to ESRI:
A hillshade is a grayscale 3D representation of the surface, with the sun's relative position taken into ...
- 10.1k
5
votes
Accepted
What would a simple hillshade algorithm be?
It is important to remember that when computing hillshading, you need to have an illumination source. Using the sun as an illumination source may mean that a cell is shaded at noon, when the sun is ...
- 660
5
votes
How to create hillshade models every hour for a zone with GDAL
As a guide on how to start:
This is a paper describing the Sun Position Algorithm, and this is a python module implementing the SPA for pretty much everything that you could do with it, including the ...
- 28.1k
5
votes
How to create an "arcgis-style" hillshade?
To complete other answers note that most very good hillshade seem to be created using a mix of of GIS and non GIS tool (ie. 3d rendering or image traitement tools) or some "hillshade only" specific ...
- 13.9k
4
votes
How to average gdal_hillshades?
For my case (hillshade and my computer), I had to use --calc="(A/3+B/3+C/3)" to get a correct average results.
(A+B+C)/3 fails because gdal_calc limit the equation to a [0-255] range. (A+B+C)/3 will ...
- 2,633
4
votes
Preparing hillshade map in mapinfo discover
Yes, Discover let's you add hillshading to your DTM quite easily.
From the Surface toolbar click the button Sun-shade Grid and use the Modify Grid Display dialog to set the appropriate settings for ...
- 7,478
4
votes
Accepted
Should I use my DEM or ortho file to create my Hillshade layer?
Short answer would be : have a try, you'll see what happen ;)
To be more explicit : you need to understand what is hillshading. Hillshading (as in shade from a hill) is a way to recreate some ...
- 7,738
4
votes
How to convert 4band RGB/A GeoTiff to 1band Gray GeoTiif?
Given a grayscale conversion algorithm, gdal_calc is able to convert an RGB(A) GeoTIFF to a grayscale one (Credits to Jukka Rahkonen).
For instance:
gdal_calc.py -R input.tif --R_band=1 -G input.tif -...
- 14.1k
Only top scored, non community-wiki answers of a minimum length are eligible