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Questions tagged [srtm]

The Shuttle Radar Topography Mission (SRTM) obtained elevation data on a near-global scale to generate the most complete high-resolution digital topographic database of Earth. SRTM consisted of a specially modified radar system that flew onboard the Space Shuttle Endeavour during an 11-day mission in February of 2000. As of 2016, it is now almost universally available at 1-Arc Second resolution.

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Should I merge SRTM tiles then reproject or reproject each tile then merge?

I have downloaded SRTM elevation tiles for England and Wales from USGS EarthExplorer. There are around 40 raster files to cover England and Wales. I now need to use QGIS to create slope and aspect ...
BlackDouglas's user avatar
1 vote
1 answer
492 views

How to extract elevation using contours in Google Earth Engine?

I want to extract the elevation values and generate contour lines from SRTM DEM at a 100 m intervals. However, I was able to create the contour lines using a code available here. But I am not able to ...
CESCRA IARI's user avatar
1 vote
1 answer
169 views

Lines Visible When Blending Raster Layer of Merged Tiles QGIS

After merging SRTM DEM tiles into 1 raster layer, the layer has no visible join lines on the map canvas as below. Multiply blending mode has been applied However, when viewed in Layout, there is a ...
Sean Jarrett's user avatar
4 votes
1 answer
473 views

Creating color physical map using SRTM V2 GeoTIFF tiles in QGIS

Trying to make a physical map (don't pay attention to the colors, I'm experimenting). The map is based on DEM SRTM V2. But I have experienced some trouble with making a smooth transition between ...
GeoEth's user avatar
  • 385
0 votes
1 answer
299 views

Is there a DEM WCS for the whole globe?

I've found some for a few individual places, but I am struggling to find one for the whole globe. North America | https://elevation.nationalmap.gov/arcgis/services/3DEPElevation/ImageServer/WCSServer?...
John Keyberg's user avatar
1 vote
0 answers
59 views

Convert ERA5 data on zero degree level into meters above sea level

I am trying to calculate the zero-degree isotherm (altitude in which temperature is at 0 degrees) in meters above sea level. I used ERA5 data by ECMWF for this and I noticed that the values decrease ...
Phil's user avatar
  • 11
1 vote
2 answers
216 views

Error: Computed value is too large, while trying to extract all the elevation values in GEE

I am trying to extract all the elevation values of a region using the NASA SRTM Digital Elevation 30m data set as a CSV file. But it is showing the error FeatureCollection (Error)Computed value is too ...
nawra parveen's user avatar
1 vote
2 answers
595 views

SRTM raster looks pixelated with hillshade style in QGIS when zooming in

I have a project and I want to create a map using SRTM as a background. I upload it ... and it looks like that: But my project area is smaller, so I need to zoom it ... and when I do that, my SRTM ...
Cipanul's user avatar
  • 19
-1 votes
1 answer
148 views

Getting high resolution DEM for a location [closed]

As a part of my project, I want high resolution (10m approx) DEM for my desired location. How and where can I get it? I already tried with 30m DEM obtained from USGS. I am getting blurry DEM, if I ...
Kaushik Vezzu's user avatar
1 vote
1 answer
115 views

Sun's Mesh Denoise algorithm not working (feature preserving smoothing)

I tried to use Sun's denoise algorithm for elevation data via the RCP project from Jake but I cannot observe any changes to the TIF file: python raster_chunk_processing.py -m mdenoise -t 0.9 -n 10 -v ...
Karussell's user avatar
  • 707
1 vote
0 answers
170 views

Find corresponding OSM ways to a set of coordinates

I'm currently building a routing application that is based on the Open Source Routing Machine (OSRM), which uses OSM data. For the routes i am trying to generate elevation profiles using SRTM data. So ...
Theo's user avatar
  • 11
1 vote
1 answer
232 views

SRTM hillshade looks weird in QGIS

I am using QGIS 3.18. My .hgt SRTM files downloaded from the USGS website looks OK except when I try to apply hillshade to it. The parameters that I have used are summarized on the screenshot below. I ...
Caribou's user avatar
  • 19
4 votes
1 answer
977 views

Blocky SRTM hillshade in QGIS

I have downloaded some SRTM topography data, which I've re-projected to a projected coordinate system and displayed as a hillshade. As seen in the attached screenshot, the product looks blocky, with ...
Saj's user avatar
  • 107
1 vote
0 answers
70 views

Strange behaviour in Z Cartesian axis when creating 3D Point Cloud

I'm working on a tool to convert SRTM data to Cesium 3D Tileset Point Cloud. All is working fine as you see here: And in this video ( subtitle in portuguese): https://youtu.be/zroGesdS-OI Well... My ...
Magno C's user avatar
  • 2,150
0 votes
0 answers
240 views

Change resolution of SRTM

Currently, I am trying to change the resolution of an SRTM downloaded via SRTM Downloader. Problem is the following: I need it in 1 Pixel Resolution but can't find a working way, either the heightmap ...
Thomas's user avatar
  • 1
0 votes
0 answers
22 views

''pixelatted'' ''griddy'' result from slope function (QGIS) [duplicate]

I use the SRTM downloader to download my DEM's, then it happens very often that when I create a slopemap there are weird artefacts in the slope map. Something I do before making the slopemap is ...
N_LLC's user avatar
  • 615
0 votes
1 answer
1k views

GDAL resample 30m file to 90m

I have an SRTM file in DTED format obtained from EarthExplorer spanning 1 degree latitude by 1 degree longitude and containing 3601x3601 pixels at 30m spacing. The pixel size resolution is 0....
Daniel C Jacobs's user avatar
2 votes
1 answer
240 views

QGIS "Profile Tool" Plugin inaccurate reading

I'm getting an inaccurate reading from QGIS "Profile Toll" plugin as you can see in the image below. Not only is showing incorrectly which of these two peaks is the highest, but also the ...
David Martins's user avatar
0 votes
1 answer
170 views

Removing no data in raster (DEM) using ArcMap

I'm trying to work with this DEM in ArcMap, which is TANDEM. But, I have areas where the altitude is not normal, since it tends to shoot (which are the areas that look like clouds). How can I fix the ...
Fernanda Sanchez's user avatar
0 votes
0 answers
190 views

SRTM 1arc second bulk download

This has been asked before, I am aware, but the web links seem to all be obsolete. Using EarthExplorer, I can get the dataset and I can download... each tile individually. I do not want to get any ...
TomGreen's user avatar
1 vote
1 answer
2k views

Seeking SRTM 90m data

I'm looking for 90 meter resolution SRTM data to coverage a large state in the Western US. I used to use Derek Watkins' awesome tile grabber for SRTM90: https://dwtkns.com/srtm/ but as he explains on ...
mikeLdub's user avatar
  • 1,205
1 vote
0 answers
239 views

Using a DSM and DEM together to identify height above ground

A pretty basic question I feel, but its something I thought I understood and further reading has caused more confusion. DEM is the topographical/elevation of the ground. DTM and DSM are pretty much ...
breandan kerin's user avatar
0 votes
1 answer
210 views

R script SRTM DEM

Someone who has experience with R in Qgis can help me with this problem. I have a script that works perfectly in R making downloads SRTM DEM and cuts to the desired polygon. But I can't implement it ...
Ramon's user avatar
  • 3
1 vote
2 answers
640 views

How to compress DEM SRTM files?

I'm trying to compress my 1.2GB DEM file to reduce its size through the OSGeo4W Shell, but it's not working, as the command only works for RGB images (3 bands), but my DEM only has 1 band (1-band). I ...
wesleysc352's user avatar
0 votes
0 answers
362 views

Convert SRTM DEM GeoTIFF to XYZ tiles

I have SRTM DEM of whole country covering large area. It takes too much time to load in to QGIS and freezes the system while zooming in and out. Is there any way to use this SRTM as XYZ tile in QGIS, ...
Paul P's user avatar
  • 113
0 votes
0 answers
496 views

I am trying to download images using SRTM download, but then this error pops up after the download has been completed

2021-05-26T13:28:44 WARNING Traceback (most recent call last): File "C:/Users/Paul Maritz/AppData/Roaming/QGIS/QGIS3\profiles\default/python/plugins\SRTM-Downloader\download.py", ...
Stelmi's user avatar
  • 1
1 vote
1 answer
1k views

SRTM elevation data download error QGIS

I am trying to download SRTM rester data in QGIS for a specific area. See image below: I am using SRTM-Downloader plugin and when I click on download the following error pops up. Any idea about what ...
Viktor Sulakvelidze-Skantz's user avatar
0 votes
0 answers
296 views

GDAL Slope function not working with SRTM DEM data?

I'm a QGIS rookie trying to generate slope data for research projects in South Africa. I've managed to download DEM data from Bing Aerial maps using the SRTM-downloader but cant get the GDAL slope ...
Francois le Roex's user avatar
1 vote
1 answer
1k views

Grid UTM coodinates in Google Earth Engine [closed]

I am trying to use GEE to make maps intended for use on trails with compasses. I have already managed to place the contour lines but I couldn't put the grids with UTM coordinates.
Mailon Figueiredo's user avatar
2 votes
1 answer
923 views

Failing to download SRTM data from USGS

I was used to download SRTM/DEM data from the following link: https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ But I'm not being able to download anymore, I don't know the exact causes of that, it was ...
Antonio Marques's user avatar
0 votes
1 answer
2k views

Get DEM from Google Earth Engine

How can I get ASTER or SRTM DEM for years like 2016, 2020,... in Google Earth Engine? I can't filter date for SRTM DEM in GEE. It seems that SRTM DEM doesn't have multi-year data, it was captured only ...
mary19977's user avatar
0 votes
0 answers
307 views

What CRS should I convert my WGS84 (unprojected) SRTM data to for slope calculations?

I have SRTM data at 90m resolution downloaded and I need to calculate slope (in degrees). I'm using the GDAL python library and command line tool for everything. GDAL can read in hgt files (SRTM files)...
Shrey Joshi's user avatar
3 votes
1 answer
159 views

Getting unexpected DEM spatial resolution using ArcMap

I have downloaded SRTM DEM 30 m. However, when I displayed on ArcMap, I got a DEM raster with 0.0002777 cell size. How can I solve this problem?
Imen BRINI's user avatar
1 vote
0 answers
190 views

Extracting Factors Causally Related to Landslides from DEMs (SRTM) [closed]

I have the SRTM dataset, and I've managed to write some python code to show elevation and slope heatmaps. The code runs fine, and the elevation data is reliable (I checked some points from the web), ...
Shrey Joshi's user avatar
1 vote
0 answers
94 views

undecodableError: invalid start byte when processing SRTM data

Downloading SRTM-Data using the QGIS-SRTM-Downloader plugin works fine. I now do want to process this image data further by using the contours plugin within the extraction tools of raster data, but ...
Walter's user avatar
  • 11
1 vote
0 answers
266 views

Flatten/smooth/reduce noise in SRTM elevation maps

Is it possible to "flatten" some areas in an elevation map using GRASS? For example I have an elevation map of Iraq. I'd like to smooth out the mostly flat areas while still keeping things ...
KaiserJohaan's user avatar
0 votes
0 answers
125 views

How to fix SRTM half-pixel shift with GeoServer

The SRTM data has an half-pixel shift (I assume that’s what is described in the last FAQ, and that GeoServer uses pixel corner origin ? I couldn’t find this information). Despite this shift being ...
Skippy le Grand Gourou's user avatar
2 votes
2 answers
2k views

Prepare DEM in QGIS to open in Blender [closed]

I have been having trouble loading 30m SRTM files into blender. I download the SRTM (DEM) 30m files from the earthdata (NASA) website and I would like to prepare them in QGIS (making mosaic, clip, ...
Jiu Domínio's user avatar
0 votes
1 answer
258 views

Unable to open hgt downloaded from dds.cr.usgs.gov

I downloaded a SRTM hgt file from https://dds.cr.usgs.gov/srtm/version1/SRTM30/w100n40/w100n40.dem.zip, after unzipping I am not able to open it in QGIS or even gdalinfo. I downloaded other hgt files ...
Elio Diaz's user avatar
  • 3,486
3 votes
0 answers
118 views

Raster artefacts after saving to GeoTIFF in QGIS

When processing DEMs created using downloaded SRTM data (initially HGT files) I produce a nice-looking product; however, saving this as a GeoTIFF creates square artefacts which are plain to see (and ...
Shawn's user avatar
  • 345
2 votes
1 answer
549 views

gdal translate resampling -r flag has no effect?

Whenever I add a resampling parameter (-r) to my gdal_translate commands, it seems to have no effect. For example the following two commands produce a binary exact result. How can I get my image to ...
A. Mort's user avatar
  • 395
1 vote
0 answers
1k views

How to add elevation data to tif to create DEM (SRTM satellite data)

I have a .tif created from the SRTM satellite data. The tif should already be DEM data as it was collected from the SRTM satellite. When I open the tif in ArcGIS, I don't see any height or z data, ...
Jeff's user avatar
  • 11
1 vote
0 answers
2k views

How can I export elevation layer data and OpenStreetMap layer data as shapefile in QGIS? [closed]

I am a newbie in QGIS looking to obtain elevation data with respect to a map. As I could not find any free elevation data, therefore I adopted the following approach. Elevation data: I got the ...
codeheadache's user avatar
1 vote
0 answers
659 views

Conversion of EGM96 to NAVD88

I am new to ArcGIS and geoids/ellipsoids, and I want to convert a dataset in EGM96 (the USGS SRTM DEMs) to NAVD88. I have the SRTM dataset from NASA downloaded and open in ArcGIS as .hgt files. I ...
Jeff's user avatar
  • 11
0 votes
0 answers
139 views

Why are SRTM tiles (*.tif) not visible in my QGIS project?

I am wondering, why my SRTM tiles are not displaying correctly in my QGIS (3.10.4 LTR) project. If I load vector layers to an empty QGIS project first, they are visible and the later added SRTM are ...
Enzo Baldini's user avatar
  • 2,347
0 votes
1 answer
203 views

DTED file project get squared by QGIS

I am quite new to the GIS world and I am trying to work with some DTED file from the SRTM project on QGIS. Unfortunately, when I add it as raster layer the program automatically shape it as a perfect ...
Marco Cangemi's user avatar
1 vote
1 answer
681 views

Load all SRTM data into PostGIS

I am trying to load all the SRTM data into a PostGIS database. I tried the process described here: https://postgis.net/docs/using_raster_dataman.html It created a giant SQL file. When I tried ...
Craeft's user avatar
  • 197
5 votes
1 answer
3k views

Use "SRTM Downloader Plugin" with "QGIS 3.4"

Edit (TL;DR): As Gabriel De Luca pointed out in his answer there is an open GitHub ticket about the issue. I would like to use "SRTM Downloader Plugin" with "QGIS 3.4" (OS: Win7, 64-bit). Now if I ...
Axel's user avatar
  • 174
0 votes
0 answers
171 views

How to convert DHHN2016 to mean sea level?

I am new to GIS. How can I convert DHHN2016 to mean sea level? I am using this dataset https://www.opengeodata.nrw.de/produkte/geobasis/hm/dgm1_xyz/dgm1_05314000_Bonn_EPSG4647_XYZ.zip which I stiched ...
sehan2's user avatar
  • 457
2 votes
0 answers
126 views

How to compare two DEMs?

I am new to GIS and I want to compare two DEM raster .tiff files, i.e. I want to compute differences between height values etc. How can I determine if the two tiff files are comparable? I have read ...
sehan2's user avatar
  • 457

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