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

1
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0answers
9 views

Alternatives to cesium terrain builder?

Looks like cesium-terrain-builder still have this issue and can't be used for large projects, so I wonder if there any alternatives to cesium-terrain-builder that can produce DEM tiles, can work with ...
0
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0answers
33 views

How to interpolate ibutton transect temperature data ArcGIS

I have three transects on opposing slopes. Each transect has ibutton data loggers set to record temperature at hourly intervals. The loggers are spaced at 20m altitudinal intervals from 1550 - 1810m (...
0
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0answers
16 views

Building cache from DEM

I have problems figuring out the best way to build a cache from a DEM. Is it possible to build Cache so that it is optimized for the current display extent, as many details will be lost if this ...
0
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0answers
23 views

QGIS DEM files do not behave the same way using the Viewshed Analysis plugin

Software and platform: QGIS 2.18.20 Windows 10 pro My issue is as follow: I am doing a Viewshed Analysis of a single site, where multiple DEM files (*.img if it makes a difference) are needed. I ...
0
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1answer
57 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 ...
0
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0answers
30 views

Rasterio Raster merge - horrible result

I am merging .DEM files from CUGIR NY repository, and need to merge files into one larger image for the whole of NY city. I use python 3.6 + rasterio; It works perfectly for all but one file - "The ...
0
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2answers
35 views

Flatten broad area through road fill connecting upstream and downstream

What are some recommended approaches for flattening a broad area through a road, as a means of connecting the upstream and downstream parts of a stream bed? I am not trying to connect these areas for ...
1
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0answers
26 views

How can I merge a DEM mosaic with an overlapping bathymetry raster (while keeping only the portions of each that I want)?

I am tasked with merging a bathymetry raster with a mosaic raster I created from ArcGrid DEM Tiles downloaded from the National Map, for an areal extent spanning the Coastal Lowlands Aquifer System. ...
0
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0answers
21 views

Shapefile with data into Unity?

So far I have imported my GeoTIFF as a height map (raw) into unity. The simplest solution to getting the road map shapefile on was to set it up as a PNG texture and layer it on. This worked well, BUT ...
2
votes
1answer
35 views

Usage of interpolation methods with DEMs: Linear vs. natural neighbors

Using the ArcGIS tool "TIN to Raster" (3D Analyst Tools --> Conversion --> From TIN) to work on my Digital Elevation Model I was wondering about the interpolation methods. I can choose either or: ...
1
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0answers
15 views

Points on the opposing side of a breakline

If you have a breakline or even a single line segment within a DEM, how can you tell if two points lie on the opposing side of that breakline or line segment? From a computational geometry standpoint ...
0
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0answers
21 views

Smoothing & standardizing time-series of 20 DEMs/DSMs of same area?

I have a set of 20 DEMs, DSMs and coinciding orthophotos (30cm GSD) of the same area acquired by aircraft which photogrammetrically we generated in Pix4D. No actual ground control was used other than ...
1
vote
1answer
40 views

GeoTiff import appears to be flat in BlenderGIS

I an very new to GIS and I am trying to import a GeoTiff file into Blender to view it as a model before importing into unity. For some reason when I import the file into blender as a raw DEM it ...
1
vote
1answer
55 views

How to open .hgts file from NASADEM data

I have the NASA SRTM1 data as .hgt files from their ftp website, but I would have these elevation data in respect to WGS84. I found by NASA's ftp site a folder named srtmOnly that contains what I want,...
1
vote
1answer
20 views

Find intersection of multiple DSM's using Python and GDAL

I am quite a beginner in respect to GIS and hopefully someone can help me out with the problem I have. I have multiple digital surface models [DSMs] of the same area with all necessary geo-...
2
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0answers
33 views

Adaptive raster to points sampling based on change of slope in QGIS?

I have a high resolution elevation map and need to convert it to XYZ points. Simple conversion generates a lot of points in flat / constant slope areas which are redundant for 3D terrain generation. ...
1
vote
1answer
41 views

Using Color Ramp Manager Plugin in QGIS?

I followed instructions mentioned here and installed the Color Ramp Manager by choosing install experimental plugins as well. Now, when I go to Properties > Style > Single Band PsuedoColor and I ...
0
votes
1answer
27 views

How to save NDVI TIFF file as txt file in ArcGIS?

Basically, I have to use elevation data (dem.tif) and NDVI data (ndvi.tif) as covariates for regression kriging and I want both these files as txt files. Please guide me how to do this.
0
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0answers
6 views

Mosaic multiple slope files

I am trying to mosaic multiple slope files into one large slope file. What is the best tool to use? I have tried mosaic to new raster but the values change from multiple decimal points to whole ...
1
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0answers
49 views

Openlayers in QGIS - Errors in opening google satellite/

End goal: To put contour lines with lat&long layers from a google earth location (Rock Piles beach, HI) in QGIS. I plan to use CRS: EPSG:3760 Does the Plug in (Openlayers / QuickMapServices) ...
0
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0answers
20 views

Reduce or heighten a DTM with overlaying polygons

I am using QGIS 3.01. I have a DTM over a historic area. There has been done archaeological surveys there, which suggest that the ground was several meteres below todays surface many hundred years ...
0
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0answers
41 views

cesium quantized mesh generator

We are trying to develop pur own quantized mesh generator and visualize these terrain tiles on CesiumJS. As an input we use SRTM data that belongs to north parth of TURKEY. We generate contours on DEM,...
1
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1answer
32 views

Changing DEM resolution when creating a slope raster? [duplicate]

I want to create a slope map using a LiDAR DEM. I think that I should use the slope tool; but I need a slope map with a 2m resolution and I'm not sure how to do that. How can I have a slope map with ...
1
vote
1answer
31 views

Blocky Raster from TIN. How to increase resolution?

So i am trying to create a seamless DEM using a DTM created in pix4d with a 5cm resolution (Raster). I have then collected RTK bathymetric data which i have turned into a TIN below To create a ...
0
votes
1answer
61 views

Elevation shading of linear feature compared to surrounding ground level in QGIS

I have a digital elevation model (DEM - geoTIFF) in QGIS 3.2. There is a linear feature (earth bund/wall) in the DEM that I would like to shade/colour based on its elevation above the surrounding ...
1
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0answers
16 views

Adding small-extent rasters to DEM

My goal: create viewsheds for observers which also incorporate the heights of buildings which could block observer view. This is using archaeological data, and is representing time change -- so I need ...
0
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0answers
29 views

Generate XYZ coordinates of DEM mesh/grid

Is there a way to generate a wire grid of plain text XYZ coordinates starting and ending points for each wire segment? I want to generate them from a digital elevation model. Preferably with gdal/qgis ...
1
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0answers
27 views

Obtaining a smoothed DTM?

I am use AcGIS 10.1 and have a DTM with an 8 m grid resolution. Which tool could I apply to smooth the surface?
0
votes
1answer
26 views

Creating a constant surface at designated height above river [closed]

I am trying to create a polygon (and eventually a raster) surface of river deposits that have since been eroded away. We know that at maximum, deposits got up to 600 ft above the present river. Given ...
1
vote
1answer
43 views

Convert several xyz data into a homogenous raster data with GRASS?

I am new to GRASS and Python and I have to convert a huge amount of *.xyz data into raster data using a batch process in GRASS. So far it works good, but when I put the created *.tif data into QGIS ...
3
votes
1answer
47 views

Merging convoluted raster DEMs - what is this method and why use it?

This is more a theoretical question than practical, and I'm referring to 3x3 convolution kernels with online demo and the first comment after it. I have a raster elevation model and want to turn it ...
2
votes
0answers
50 views

QGIS: How to find a line with defined slope starting from a point over a DEM? [closed]

If I have a DEM as raster layer and a point with defined position in a point layer, how could I generate a line with defined slope of e.g. -1%? The end point can be anywhere and should be defined by ...
2
votes
2answers
111 views

How to create “roof line” for a general polygon area?

I have a polygon with an arbitrary shape ( assume that it is well-formed with no self intersection, no duplicated points etc), and I need to subdivide the polygon into sub-polygons like how one would ...
1
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0answers
33 views

Integrating use of surface distance when calculating cumulative cost-surface based on walking pace?

Disclaimer This question is somewhat related to a number of earlier questions of mine: Accumulated cost surface (Tobler's hiking function) ignoring slope using R gdistance?; Calculating ...
4
votes
2answers
180 views

Is D8 flow accumulation algorithm still suitable for watershed computation if terrain contains lots of flat area?

My question is inspired ( and similar) with my previous question. But this question is more concerned about the suitability of D8 ( or in general non-dispersive) flow accumulation algorithm for ...
0
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0answers
36 views

Hillshade in QGIS 3: scale correction factor missing

Recently (ca. 2 weeks ago), I created a QGIS-Project (QGIS 3, Win 7 and 10) covering large parts of Eurasia as physical map, using hillshades created from SRTM-DEM with the Raster – Analysis – DEM (...
1
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0answers
44 views

Flow accumulation algorithm open source code in C++ on Windows

I'm looking for flow accumulation open source implementation ( C++ or C# would do, Python no), on Windows, preferably the source code comes with Visual Studio project files so that I can just build ...
0
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0answers
37 views

QGIS - Average a DEM into a single, flat plane

I have a XYZ point cloud that I am interpolating into a DEM. The data represents a surface that is relatively flat. I am hoping to be able to create a DEM of a single flat plane that best represents ...
1
vote
1answer
30 views

Failed to execute EucAllocation - arcpy

Im unable to get EucAllocation function working in ArcMap 10.5.1 or via Arcpy. I've used user guides for info but with no joy - http://desktop.arcgis.com/en/arcmap/10.5/tools/spatial-analyst-toolbox/...
1
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0answers
17 views

Photogrammetric point cloud classification

My question is regarding the point cloud classification and editing work for a photogrammetric point cloud generated using drone based imagery. My objective is the generation of a digital elevation ...
1
vote
1answer
43 views

Mapserver / QGis and DEM GeoTIFF different nodata values behaviour

I Have a problem with novalue datas in my DEM… This is the workflow I did: my DEM datas are in multiple Arcgis ASCII grids… Each .asc files have a header containing "NODATA_value -99999.00". I ...
5
votes
1answer
106 views

DSM quality lower in ArcGIS Pro than PhotoScan

I am processing aerial photos collected with an automated drone flight into orthomosaics and DSMs, and have noticed the quality of outputs produced in PhotoScan is much higher than those produced in ...
1
vote
0answers
36 views

ArcGIS hillshade creates artifact on tile boundary

I'm working with ArcGIS on a DTM made of 1x1km tiles (cell size 20cm). When I try to create an hillshade model based on this DTM I get visual artifacts on tile junctions, whereas there are no visible ...
3
votes
1answer
92 views

Selecting LiDAR return point type in LiDAR dataset with ArcPy?

I am trying to create a Digital Earth Model (DEM) using ArcPy under ArcGIS Pro 2, but I am running into some problems. I can generate a DEM within ArcGIS Pro by selecting only the ground points ...
1
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0answers
29 views

DEMs not displayed properly in 3D in ArcScene and QGIS

Some of my DEMs are rotating about an axis off the screen, if that makes sense. I defined them with a CRS of GCS 1984 and projected it in UTM. I am only loading one at a time to provide perspective ...
0
votes
0answers
31 views

Registration of stereo pairs?

I am trying to generate DSM and orthorectify the satellite images by myself without using any photogrammetry software. However, primary products are not aligned and I could not register them to ...
0
votes
1answer
50 views

Comparing DEM volume using GRASS

I have two DEMs of an open-pit mine taken a few weeks apart. I would like to estimate the volume that has been excavated during that interval, ie the difference of volume between the two DEMs. Can I ...
0
votes
0answers
11 views

Pop-up for image withqgis2threejs with qgis Las Palmas 2.18.19

I'm trying to let's open pop-up on click when generate 3DDEM with qgis2threejs,like this exemple https://anitagraser.com/2015/01/31/publishing-interactive-web-maps-using-qgis/ any tips to how to do?
2
votes
1answer
38 views

Elevation contours from .JP2 / .J2W files?

Is there a way in ArcGIS, Global Mapper, or CAD to generate elevation contours or any sort of surface data from a .JP2 file? I've never been provided this format before and our client is telling us ...
0
votes
0answers
28 views

Projection of shapefiles in ArcGIS and ArcScene?

I have downloaded Open Street Map Data of a Kurseong, West Bengal. I have Downloaded DEM from USGS. I have changed the projection to "Projected Coordinate System, WGS1984 UTM zone Northern Hemisphere" ...