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Questions tagged [terrain]

The vertical and horizontal dimension of land surface

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33 views

Erroneous contour polygons in QGIS 3

I have a global DEM and try to calculate contour polygons for 4 different heights in QGIS. In the first image below, you can see the colored DEM (white = lowest; yellow = higher; orange = highest) as ...
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0answers
10 views

Creating terrain polygon buffer from line using ArcMap? [duplicate]

I have a line in a steep hill, and need a 400 meter buffer on each side of the line. I know (roughly) how to create buffer on a point, but not a line. Can someone help me here?
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0answers
8 views

Does the OS terrain 50 data exist as HGT files anywhere?

The creator of OpenAndroMaps is showing interest in improving the contours for the UK. HGT files are what he needs. Does the OS Terrain 50 OpenData exist as HGT files anywhere? If it doesn't...is ...
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0answers
39 views

Is there a way to linear reference a line in QGis [duplicate]

Iv'e seen a number of plugin's that do things like create grids of points and such like, but what I need to do ideally is to create a line of points that follows a line geometry, and then drop those ...
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2answers
92 views

“Relief” function from the Raster Terrain Analysis plugin in QGIS 3.0

I am using QGIS 3.0, where I can't find the Raster Terrain Analysis plugin. I am under the impression that the plugin was embedded into the QGIS 3.0 version, as under "Raster --> Analysis" there ...
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1answer
45 views

Extracting Road Terrain Properties using DEM / LIDAR

I want to extract following road terrain data from DEM but I'm not sure if its possible. Can i extract these attributes using LIDAR if not DEM ? These are the data fields I need: Horizontal curve ...
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0answers
22 views

What is Google's 'terrain' basemap? [duplicate]

I've been using Google's 'terrain' map type with ggmap in R to plot some spatial data that I have. It prompted me to ask, what exactly is this layer showing us? Slope? Is it a form of hillshade? How ...
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0answers
43 views

Converting Surface Model to Elevation Model?

Is there a way to convert a digital surface model (DSM) to a digital elevation model (DEM) in QGIS? Surface models contain lots of noise (e.g. trees, buildings) when I only want to show the ground. ...
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1answer
155 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,...
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0answers
49 views

Using the height of river to approximate its extreme flood boundaries - terrain analysis in QGIS?

Using QGIS I'm trying to analyse an area/DEM with this criteria: - heights 10 meter above the river-centerline in both sides of river. I can do it with the calculation of contours (2m) from DEM and ...
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0answers
18 views

Ruggedness Index appended to point data [duplicate]

I'm working with two key files, one is a ruggedness Index raster built from a DEM raster file and the other is point data for roughly 100k points. What is the simplest method available using open ...
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39 views

Exclusion zones (for trees/buildings) in QGIS Viewshed

Is there a way to set up an 'exclusion zone' in a viewshed in QGIS? For example, I want my viewshed to take into account a large block of screening trees in it's calculations, to see how the ...
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0answers
337 views

Using QGIS 2.14 to creating a evenly distributed grid of points, spaced 500m apart, that takes terrain into account [closed]

I am using QGIS 2.14 (Essen Version). I need to create a grid of points within a given area so that each points 500m across the ground from any other point. At these points trail cams will be placed,...
2
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2answers
134 views

Clipping terrain in ArcMap?

Is there a way to clip a terrain in ArcMap, or make sure it doesn't exceed a certain geographical extent area in the first place? After creating my terrain from a multipoint file it looks like this: ...
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1answer
270 views

Interpreting results in legend, SAGA GIS or QGIS? [closed]

Can somebody explain to me what units of measurement do I get in the results of analysis, ground morphometry in SAGA GIS software or through a plugin in QGIS? for example: Terrain ruggedness index (...
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0answers
62 views

Error in loading terrain files (.terrain)

I can't load the terrain file to the cesium. Now I will describe how I did it step by step. Hope this will help you find out where I went wrong. STEPS: Basically, I am following the tutorial in this ...
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0answers
42 views

Esri Terrain-Tools v1.1 Sky Tool Cannot Save File

I am trying to use Esri Terrain-Tools v1.1 to create a hillshade from either a 90 m SRTM DEM or 30 m DEM. I have tried saving this to a file geodatabase (FGDB) and .tif. In both cases the error ...
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79 views

Unable to set a terrain to a CityEngine scene

Since yesterday I'm facing an issue while setting a terrain in CityEngine. It's very frustrating because the problem appeared suddenly, before terrain data were loading and projected correctly. The ...
5
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2answers
448 views

Using slope and total height for terrain analysis in QGIS?

Using QGIS I'm trying to analyse an area/DEM with these two criteria: -Even sloping terrain steeper than 1:20 and total slope height > 5 m. Finding areas with slope of 1:20 (5% slope) could be done ...
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0answers
28 views

Terrain obstruction between 2 points

I'm trying to figure out the amount of terrain obstruction there is in a straight line between two points. I used the Terrain Profile plugin in QGIS to get an elevation graph against distance, and I'...
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1answer
49 views

Can I created a DEM or digital surface model with high resolution image

I have VHR imagery, 5 cm pixel, and I want to create a DEM but this image has high trees and when I take my model I cant take a real elevation because DEM is not the height of the terrain. Could I ...
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0answers
37 views

No cell value in raster file [duplicate]

I downloaded a .tif raster file from opentopography.org. It's an Alos (AW3D30 ) topography file showing mountainous terrain in Sweden. On the very right the file contains terrain, and on the left a ...
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1answer
49 views

Finding Rocky Outcrops

I've been asked by one of my users if it's possible to find "Rocky Outcrops" in an area. They don't really have a definition for what that means, it's a very open ended question! My feeling is that ...
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0answers
59 views

Measuring true length of polyline over terrain in QGIS? [closed]

I use QGIS for a variety of mapping purposes and also for managing UAV/drone data. I need to calculate the true length of a mapped fence over varying terrain for which i have a detailed DEM. Is this ...
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1answer
65 views

Changed aws terrain datasets

I noticed that the structure and size of the file was changed pattern https://s3.amazonaws.com/elevation-tiles-prod/geotiff/{z}/{x}/{y}.tif example https://s3.amazonaws.com/elevation-tiles-prod/...
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2answers
228 views

CityEngine: aligning a shape to terrain

I have three layers: 1-Parcels 2-Buildings 3-DEM I imported them all into CityEngine and I aligned parcels and Buildings to Terrain (DEM). I noticed that, in large parcels (see Figure 1), some ...
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0answers
521 views

Terrain correction / Orthorectification with gdal

Since MODIS Imagery Orthorectification (Open Source) had no answer, I will try to get one here with a similar problem: I got some raster datasets with GCPs in lat/lon, but without height information. ...
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1answer
122 views

Use LatLng Double to query GeoTiff in geotrellis (scala)

I am currently trying to read bigtiffs into geotrellis in Scala to read single band terrain geotiffs. I can load them successfully, and query data/access CRS and extent info by val tiffPath: String =...
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1answer
32 views

Creating ArcGIS terrains using ModelBuilder?

I'm trying create a terrain using ModelBuilder but with "Create Terrain" there is no where to specify SFTypes and when the model is run it give the error: The Terrain definition is incomplete or ...
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0answers
469 views

Cartopy image tiles - determining possible zoom level in advance?

In Cartopy I'm using an image tile like so: terrain_tile = cimgt.StamenTerrain() ax.add_image(tile, zoom) By default I've set the zoom level to 14 and that works perfectly for my first test case. ...
4
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1answer
198 views

QGIS: Terrain accessibilty in hours/days usind DEM/CSV data

I am an Archaeologist. I am interested in settlement dispersal and land use strategies in late antiquity and early middle ages. Therefore, I want to analyze a certain terrain by: - least cost ...
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1answer
126 views

How to style rocky coast?

I've got a bunch of data from LINZ which includes rocky areas. Is it possible to style them as they do (see picture)? It's a fairly standard style in large scale maps so I hoped it would be simple! I'...
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0answers
33 views

Interpret terrain type from height data and/or geolocation

I have downloaded a large subset of the STRMGL1 Dataset, and have further split each entry down into 5km by 5km tiles. I now need to start classifying each tile by terrain types. Are there any ...
2
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1answer
328 views

Extruding building heights from 3D terrain model creates sloped buildings

How can i prevent sloped buildings when I extrude building footprints over sloped terrain? I am using FME to drape 2D features over terrain (SurfaceDraper), then using the Extruder transformer to ...
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0answers
47 views

Slope Analysis from Raster and Contour Lines do not match QGIS [duplicate]

Having run the slope analysis using Terrain Analysis with a percentage output, I found that my outputs ranged from 0 to 0.013, with virtually all land ranging from a slope of 0 to 0.00326. Measuring ...
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1answer
212 views

Contour TIN Interpolation

I'm attempting to interpolate the NU national grid square of Ordnance Survey's terrain data (10m intervals). If I interpolate with IDW, I encounter no issues and the raster pixels are square in shape ...
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2answers
116 views

Slope between max and min values of a defined area within a DEM

Say I have a DEM raster. I then also I have a set of polygons in which I would like to know the slope between the max and min DEM values of any given polygon. If my thinking is correct, I could ...
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2answers
583 views

Creating a map highlighting areas of potential visibility of a high structure

The end goal is to add a point which will represent a mast/pylon of x height and for QGIS to generate polygons for the surrounding area which will have direct visibility of the top of the structure ...
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2answers
335 views

Algorithm for smoothing DEM without losing max and min elevations

I am looking for a method/algorithm for smoothing a DEM raster similiar to something like lowpassing, however I want to keep the highest and lowest points, resp. peaks. Latter often are only ...
4
votes
1answer
1k views

DTM extraction of tree heights

I need to classify tree heights in a DSM of a slope-y terrain. It´s not a forest but several individual / detached trees. In a plane terrain it won´t be an issue but in that uneven terrain I need ...
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0answers
125 views

Buffering based on topography in ArcGIS Desktop?

I need to do a buffer based on the real terrain. Like 500 meters from a polyline on all sides. I have DEM (SRTM) of the terrain. Is there a way to do that?
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2answers
658 views

Slope, in which direction?

I have a dilemma? I work with a slope terrain. Slope field is done by a percentage of 10%. My question is, in which direction is oriented this pixel, or any pixels? It is important to know to what ...
0
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1answer
664 views

Open source solution to convert terrain data to collada?

I am exploring how to convert terrain information (DTED, SRTM, etc) to a 3D mesh file. Collada is preferrable as it is very compatible. I have read this: Converting dem and geotiff to collada model ...
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0answers
131 views

Smoothing relatively flat DEM for terrain and hydrologic analysis

I'm trying to do some terrain and hydrologic analysis from a 1/3 arcsecond DEM that I downloaded from the USGS National Map website. The issue I'm having is that the area in question is central ...
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0answers
38 views

Displaying Coastal Terrain Models in ArcGIS

I'm trying to display a simple Coastal Terrain Model (CTM) using ArcGIS 10.2.2. The display I have in my first image (below) is ideal, however this was constructed using Unique Values to define the ...
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0answers
92 views

Generalize raster data dependent on DEM?

I'm working on a generalization process of probabilistic calculated raster data (rockfall extend, data shows probability of being hit by a rock in %; I used binary data, 1 for "one hit or more", 0 for ...
2
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1answer
1k views

Terrain() function for computing slope and aspect from elevation data always returns NA

I'm facing a problem with the terrain() function in the raster package (in R) since yesterday. I'm working with elevation data and coordinates in Lambert 72 (espg registry : "+init=epsg:31300"). Here ...
1
vote
1answer
502 views

Cesiumjs 1.32 and ArcGIS 10.2 - ArcGisImageServerTerrainProvider is being deprecated - how to provide terrain data

I tried to connect CesiumJS to ArcGIS by using ArcGisImageServerTerrainProvider. This works OK if I have a map in simple format BUT: ArcGIS 10 now supplies data in LERC compression and Cesium can't ...
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0answers
42 views

Elevation from GPS Vs. Query Elevation from Static TOPO database like SRTM

As far as I understand the GPS determines Elevation by real time calculations. What I don't understand is how? For example let's assume perfect (errors free) Lat/Lon fix by GPS. So I can query static ...
1
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1answer
288 views

Does maptiler support DEM .tif images?

Does maptiler support DEM *.tif images? I was generating terrain tiles via cesium-terrain-builder but I wonder can I use maptiler somehow?