Questions tagged [terrain]
The vertical and horizontal dimension of land surface
0
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0answers
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 ...
0
votes
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?
-1
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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 ...
0
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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 ...
1
vote
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 ...
2
votes
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 ...
-1
votes
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 ...
2
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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. ...
1
vote
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,...
4
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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 ...
0
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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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0answers
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 ...
5
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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
votes
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:
...
0
votes
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 (...
0
votes
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 ...
1
vote
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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0answers
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
votes
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 ...
0
votes
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'...
0
votes
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 ...
0
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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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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/...
1
vote
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 ...
1
vote
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. ...
0
votes
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 =...
1
vote
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 ...
1
vote
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
votes
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 ...
9
votes
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'...
1
vote
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
votes
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 ...
0
votes
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 ...
0
votes
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 ...
2
votes
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 ...
1
vote
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 ...
1
vote
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?
7
votes
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
votes
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 ...
1
vote
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 ...
1
vote
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 ...
1
vote
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
votes
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 ...
0
votes
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
vote
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?
