Questions tagged [dem]

For questions about Digital Elevation Models (DEM), Digital Terrain Models (DTM) and Digital Surface Models (DSM)

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28 views

Selecting coordinates of points below DEM (DTM)

I have a DEM file and a big list of X,Y,Z point (about 1M). Each of them can be below or above the DEM file. Is there a quick way to select the x,y,z points below the DEM file using Python? I did ...
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2answers
8k views

Removing negative values from DEM using ArcGIS for Desktop?

i'm using (ArcGIS 10.1) and i want to remove a negative values from DTM in order to keep just a ground topographic surface.
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2answers
24 views

Why does Blender not accept DT2 file (elevation data from EarthExplorer)?

Trying to do the Creating Shaded Relief in Blender tutorial https://somethingaboutmaps.wordpress.com/2017/11/16/creating-shaded-relief-in-blender/ Got the file from SRTM 1 Arc-Second Global. Got ...
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1answer
29 views

Applying xyz translation vector derived from IceSAT altimetry to an ArcticDEM strip?

Laser altimetry data from the NASA IceSAT spacecraft is used to compute x, y, and z offsets for ArcticDEM strip files. The values of these offsets are contained within the DEM metadata, but are not ...
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1answer
82 views

EU DEM in GRS80 EVRS2000 with geoid EGG08 --> Make it comparable to Black Sea 1975 for Romania

I got contour lines for western Romania in vertical system Black Sea 1975 which is based on elevation data with 100 m resolution. Now I would like to compare that to the EU DEM with higher resolution. ...
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2answers
44 views

Problem processing Slovenian LiDAR DTM with GDAL (and QGIS): “too many stepY values” error

If I want to apply GDAL (version 2.2.3) on the LiDAR derived DTM (ASCII) from Slovenia (Link to Slovenian DTM below), I run into this error: gdalinfo input.asc ERROR 1: Ungridded dataset: At line ...
2
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1answer
37 views

Stream Feature generated from DEM is missing data

I tried to search other questions to see if this has been answered but couldn't find anything, so sorry if this is redundant. I use the Hydrology toolset in Spatial Analyst to create a stream feature ...
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0answers
35 views

QGIS Grass 7 r.fill.dir

The following layers were not correctly generated.C:/Users/JIM/AppData/Local/Temp/processing_e2688a45d8934d16a2269a7ef6af8cbd/7eefcc8d13144f598fa7ab5bb5d657b8/output.tifYou can check the 'Log Messages ...
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0answers
16 views

3D Display of sub map on a map with python [closed]

I have a map of heights represented by a numpy array (x,y, z = height), and a sub map of the first map, also represented by an numpy array. Is there a way to display a 3-dimensional representation of ...
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1answer
15 views

ArcGIS 10.X - DEM raster creation - Point to Raster vs. Terrain to Raster tools [closed]

I have a bunch of LiDAR data that I need to make a raster DEM & DSM from. From what I can gather my options are use the Point to Raster tool directly on the Multipoint feature or make a terrain ...
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0answers
26 views

Point/Area location of data in reference to geotransform of raster

I'm trying to understand how to interpret the position of pixel data within a GDAL raster, specifically as it applies to files containing height data. I'm create Triangular Regular Network (TRN) for ...
2
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1answer
62 views

Can QGIS render and show DTM (Digital Terrain Model)?

I wonder if qgis can properly render a DTM (triangle) layer (as shown in image1) and become like a moveable (orbit-able) map to export to web browser? If this is possible, where should I start from? ...
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0answers
15 views

Opening LIDAR DEM in QGIS with several .adf files

I have a LIDAR DEM dataset of a bay. What I got is a single folder with these files I found out that the w001001.adf is the one that contains all the raster data and that the dblbnd, hdr, prj.sta ...
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0answers
11 views

Methods for selecting areas adjacent to higher slope features? [closed]

I'm using the ESRI Predictive Analysis tool to attempt to model potential locations for a particular type of occupation area. I'm working with the NED 1/3 arc set DEM and I want to delineate ...
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2answers
2k views

Filling hole in DEM using ArcGIS Desktop?

How would I fix my DEM because it has holes? I need to maybe extrapolate from surrounding terrain. Here is the picture
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2answers
45 views

Altitude extraction from a DEM(.tiff) file using Python [duplicate]

I have a DEM(.tiff) file and I need to know the altitude of certain points(coordinates). I opened it like this: import tifffile as tiff import matplotlib.pyplot as plt import rasterio tfile = tiff....
3
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4answers
6k views

Mosaic to New Raster tool fail

I'm trying to merge 24 DEM files, after applying the tool (Mosaic to New Raster) only 11 out of the 24 merged. All the original files are in the same projection, pixel type, band, etc. I also ...
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1answer
53 views

Generating DEM Generation in LPS?

I have a Cartosat 2.5 m Imagery and Block files along with DSM Data. I wanted to generate DEM using Leica Photogrammetry Suite Software. Does anyone know the steps of generating same? I have to edit ...
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1answer
40 views

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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1answer
35 views

Comparing Slope among various DEM resolutions?

I'm comparing the slope products derived from DEMs of various spatial resolutions (1m, 10m, 30m) for a set area. The trend I find is that as the resolution improves, the areal extent of various ...
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1answer
19 views

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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0answers
15 views

Interpolating Line in ArcGIS 3D Analyst

I am trying to make a 2D topographic profile using the Interpolate Line tool and a DEM. I've done this before on a different project; not sure why it's not working now. The 3D Analyst extension is ...
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1answer
44 views

Extracting DEM from PRISM data?

I have PRISM data which is in the following format. Are there any ways (software and methods) to extract the DEM or elevation information from these data files?
7
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2answers
8k views

Cropping Geotiff with gdalwarp

I downloaded a geotiff from the recently published 25m-DEM of the European Union (see: http://courses.neteler.org/eu-dem-new-digital-surface-model-at-25m/). One tile has about 5GB so I would like to ...
8
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1answer
123 views

Coarse Woody Debris extraction

I created very high dense point cloud of some forest plots using terrestrial laser scanner. Then removed points above 1.3 meter to see the coarse woody debris (Fallen dead trees). Attached is the ...
4
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0answers
24 views

Difference between merge and create virtual raster

I have the DEM of a defined region that has been split into sub-DEM with a resolution of 1 km x 1 km. When I merge the sub-DEM to create a single DEM (Raster -> Miscellaneous -> Merge), the overall ...
8
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1answer
3k views

How to extract DEM (Digital Elevation Model) from 3D model

How can I extract a Digital Elevation Model from a 3D model of a building, made with SketchUp, using Blender,qgis or any other software?
32
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8answers
5k views

Generating random but believable digital elevation model? [closed]

Is there a way to generate a DEM, programatically or otherwise, that will feed into ArcGIS Desktop for further spatial analysis? Perhaps this needs to be broken down into smaller incremental steps: ...
0
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1answer
45 views

Open TIN DEM File format

Anyone know a TIN DEM file format commonly used? In the context of a TIN DEM generator project, I am searching for a file format to save the TIN generated.
3
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4answers
7k views

How to clean up contours?

I have .dxf file with contour lines representing elevation. But this contours are too "ugly" and elevation model looks just bad. As you can see on image, contours are not continuous... Is there any ...
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0answers
55 views

Creating DEM from points in QGIS? [closed]

I'm trying to make DEM from points in QGIS. I've read all the other questions regarding the same issue and tried them all. But, none of them worked. For example, at the end of inverse distance ...
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0answers
17 views

Snap raster to specified coordinate point?

Is there any way to get a raster to snap to a specified coordinate point? The documentation for the snap raster environment setting says: The lower left corner of the given extent is moved to the ...
2
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1answer
57 views

Merging DEMs in QGIS?

Not the first problem I've had with DEMs in QGIS 3.4. Trying to merge 6 DEM tiles together into one. Process for this is simple: go to Raster --> Miscellaneous --> Merge. Once in the menu, select ...
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1answer
204 views

ArcGIS Raster To Multipoint Mac/OSX alternative

Is there an alternative to the ArcGIS Raster To Multipoint tool for Macs? The VIP thinning method is particularly of use. A comparative point cloud thinning/simplification tool to this would just as ...
3
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1answer
284 views

TIN interpolation problem

I made a TIN interpolation of some height points but the resulting raster appears with some weird lines (like in the pic) What can i do to avoid this result? Here are the input parameters. Sorry ...
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0answers
23 views

QGIS - Smooth merged DEM

I am having trouble making smooth contours from a DEM I created by merging two different DEMs of different resolutions (1m and 10m). The DEMs are partially overlapping and the contours I have ...
1
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1answer
30 views

Georeferencing a stack profile graph?

Is there a way to get a georeferenced profile graph from Stack Profile? I have a DSM and use transects to get a profile graph from the DSM. This gives an x,y value between 0 and 300m (the length of ...
2
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0answers
27 views

ArcMap - Blocky/Shattered Glass DEM Fix?

I am currently working with some data obtained from the Spanish Government to produce Digital Elevation Models for a site I am studying. I want to create a model that is essentially showing the ...
0
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1answer
35 views

Transfering height information from DEM to line feature to use in profile with ArcGIS Pro?

I am using ArcGIS Pro 2.4. I want to make a height profile of a line segment. The line has no height information, so I want to transfer height information to the line from a dem. How can this be ...
1
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1answer
49 views

Importing DEM to QGIS?

I downloaded a DEM file (package, rather?) of the entire US from usgs.gov. It's 30GB and contains quite a few files. Is it possible to import this to QGIS to overlay the data on my map?
4
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1answer
158 views

Use DEM elevation attributes in vector polygon?

I am modeling glacier retreat scatching polygons on DEM surface trying to come out with 3D scatch. Is it possible to adjust "height" of polygon to follow elevation of DEM surface (eg. glacier height ...
1
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1answer
45 views

Detrending DEM (QGIS)

I’m trying to detrend a DEM in QGIS. The best guidance that I could find on the internet was this question : Removing elevation trend over sloped surfaces? I couldn’t understand that so I would like ...
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1answer
707 views

DEM reconditioning?

I'm using ArcGIS Desktop 10.5 Arc Hydro Toolbox & encountered a problem while trying to delineate watersheds respectively drainage lines. The red lines indicate my obtained drainage lines, which ...
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2answers
60 views

Applying low pass/median filter over DEM in GeoTIFF format using ArcGIS Desktop?

I want to apply a median/low pass filter (over a few hundred kilometers) over my DEM to reduce the noise. I tried ArcGIS focal statistics tool but no luck. I got a blank GeoTIFF file. How can I do it ...
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0answers
49 views

Identifying upside and downside of road using QGIS?

I am a forest engineer and I have to reclassify a DTM in upside pixels and downside ones in relation to a line shapefile indicating skid trails network of the forest parcels. I don't have necessarily ...
0
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1answer
571 views

gdalbuildvrt error when mosaicking SRTM data with different NoData values?

I'm attempting to mosaic together 9 SRTM tiles downloaded from CGIAR to produce a DEM of Borneo. I'm using: gdalbuildvrt Borneo.vrt BorneoSRTM/*.tif where BorneoSRTM contains the 9 tif files to be ...
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0answers
19 views

Edit small details of DTM Raster in QGIS (flattening rocks or erasing buildings)

I got the following Raster, in which I would like to erase the rocks that appear on it. I applied Gauss filter and got rid of small rocks (as noise), but which tool should I used to erase bigger ...
16
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4answers
5k views

Manually correcting raster DEM (OpenSource)?

Is it possible, to correct a raster DEM by changeing the raster-cell-values manually, like by "painting"? My DEM (ASTER) have one small error where the elevation is about 300m below the actual ...
0
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1answer
126 views

Changing slopes derived from DEM using ArcGIS Desktop? [closed]

I have a DEM for a region over which I want to simulate an ecological process. I would like to run several simulations for the same region but I want to alter the topography for the simulations. ...
0
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2answers
2k views

Seeking Elevation Data for Scotland? [closed]

I have been searching for quality elevation data for the entire Scotland but I have not succeeded yet. Do you know where to get the data in Raster or Vector formats? Accuracy is very important as ...