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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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 ...
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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 ...
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''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 ...
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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....
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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QGIS SRTM-downloader plugin python error

Trying out the SRTM-downloader plugin and it is throwing an error every time I try it. I can't read Python very well so I have no idea what's going on. Is this a permissions issue with writing to a ...
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Difference between SRTMGL3_NC and SRTMGLC3_NUMNC

I requested elevation data from https://lpdaac.usgs.gov/products/srtmgl3v003/ by using the API and received couple of files. I received two .tif files, which are obviously elevation data. However they ...
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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 ...
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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 ...
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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, ...
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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", ...
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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 ...
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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 ...
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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.
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280 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 ...
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777 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 ...
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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)...
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3 votes
1 answer
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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?
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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), ...
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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 ...
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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 ...
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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 ...
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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, ...
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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 ...
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3 votes
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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 ...
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2 votes
1 answer
274 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 ...
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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, ...
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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 ...
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1 vote
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384 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 ...
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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 ...
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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 ...
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1 vote
1 answer
412 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 ...
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5 votes
1 answer
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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 ...
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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 ...
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2 votes
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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 ...
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Adding elevation to shapefile in ArcGIS Desktop

I have a shapefile that's actually a polyline (but it's 200 miles!) on the other hand I have a SRTM layer with elevation data. How should I add the elevation data from SRTM layer to the shapefile? ...
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Converting "ALOS PALSAR" DEM to EGM96 vertical system using ArcGIS Desktop

I have downloaded "ALOS PALSAR" DEM from NASA's EOSDIS. Can you help me to convert the high-res DEM to EGM96 (like SRTM data)? I have used ArcGIS Desktop 10.7 edition but it does not work correctly. ...
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2 votes
1 answer
1k views

Least Cost Path Analysis in QGIS?

For my Bachelor's thesis I try to reconstruct a road betweeen two ancient cities. One method I'd like to try is least cost path analysis with QGIS. I've worked with QGIS before, but mostly only ...
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SRTM DEM data appear mismatching in BW/Saturation or even brightness when gathered

I'm trying to make a DEM data of Algeria as I tried to download about 15 SRTM data but when added on ArcGIS and gathered they appear with diffrent saturation/brightness each, I tried then again to ...
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1 vote
1 answer
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Quality of SRTM 4.1 vs 2.5

In recent years I have used this source https://dds.cr.usgs.gov/srtm/version2_1/SRTM3/ to retrieve elevation data from files in .hgt format. The problem is that these data have holes, so I'm looking ...
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SRTM Data tiles appear to be different scales

I have downloaded the STRM files (.bil) for Hawaii and rendered them in QGIS. They render as grayscale heightmaps. Although all of the tiles appear to line up, none appear to be using the same scale. ...
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1 vote
1 answer
197 views

Move GeoTIFF file to another coordinate of lat and lon [closed]

I have a GeoTIFF file that corresponds to terrain data (SRTM 3-arc data). I need to do 3 things; Crop a specific area of ​​the raster and Literally move the raster to another coordinate of lat and ...
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Which layer for least cost analysis?

I'm new to least cost analysis. I have a DEM-layer of a region and I want to know what's the least cost path from a to b. Do I have to use the DEM layer to calculate that? I also have a hillshade ...
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1 answer
139 views

Which layer for least cost path analysis

New QGIS user here, so maybe it's kind of a stupid question. I want to calcualte the least cost path between two points but I don't know which layer to use. I have two layers, one is a hillshade layer ...
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3 votes
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420 views

Removing noise selectively from DEM using QGIS?

I am looking for a processing tool that can remove noise selectively from a DEM (Mostly SRTM). My current workflow includes "Fill sinks" and "r.neighbours". The problem is that the tool is blind to ...
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3 votes
1 answer
437 views

QGIS raster merge results in a black rectangle

I have 4 SRTM raster like this: I want to merge them into 1, but when I do this, something like this happens (I only tried it with two of them here): I also tried changing the min and max values ...
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