Digital Elevation Model (DEM), which could be a Digital Terrain Model (DTM) or a Digital Surface Model (DSM).

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2
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1answer
46 views

Reclassifying a DEM using ArcMap 10.1

I have a DEM that am reclassifying into two classes. One areas less than or equal to 1000 and the other areas greater than 1000. Am accomplishing this using the reclassify Tool in ArcMap 10.1. The ...
0
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1answer
21 views

Creating DEM from topography map in QGIS [duplicate]

For my geology diploma project I need to create DEM from topography map my professor gave me to use as a base map. The map is georeferenced. My idea was to draw lines over the izolines of the map, ...
2
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0answers
18 views

How to calculate best path between 2 points from a DEM in Qgis?

I'm analyzing the roads and paths of a region by calculating how effective the communication is in the region. First I calculated the shortest paths between the points using the actual road map. Now ...
3
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1answer
38 views

How to derive a hydrologically correct DEM from point shapefile using QGIS?

I used grass gis v.surf.rst function to interpolate a surface using vector points. But it is very difficult to find a optimum parameters to be used. I am still unable to develop a accurate terrain
1
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2answers
53 views

Filling up river corridors in a DEM

I'm currently working with a DEM (10 m x 10 m resolution) that has a lot of faulty elevation values in river corridors. In order to run a hydrodynamic model I'm trying to get the following done in an ...
2
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1answer
32 views

How to import a digital elevation model in Germany Gauss Krüger from .dat file?

i am very new to qgis. I want to create a hillshade file and also calculate the inclination. The structure of the digital elevation model data looks like this: 5390.0125 5659.9875 251.8 5390.0125 ...
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0answers
28 views

Stream Burning/DEM Reconditioning

I am conducting a regional study in the Midwest. I was wondering if stream burning would be necessary for this large region. I am using a 90 meter DEM. If stream burning is necessary, what should the ...
1
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1answer
58 views

How to find the height information from LiDAR point cloud data [duplicate]

I need to find the biophysical parameters(biomass) from the LiDAR point cloud data. For that I need the height of the trees from the data. Currently I am having the general height with respect to sea ...
1
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1answer
17 views

Free Digital Elevation (Terrain) Model of Europe or Germany

Is there any free (or not expensive) source of Digital elevation model of Europe or Germany with the resolution of 10 meters or better and vertical accuracy of +-5m or better? Thanks!
0
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1answer
29 views

How do you identify cuttings / crevices from a DTM or DSM using ArcGIS?

I am trying to identify where cuttings and crevices exist by using a DTM or DSM. My ultimate aim is to find where roads and rail lines sit within a cutting i.e. the land either side of them is higher ...
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0answers
24 views

Creating tiling scheme to get multiple extents before gridding elevation data

Looking to create 1 degree by 1 degree tiles with pixel overlap to get extents before I start gridding. So basically I would like to have a shapefile of the tiling scheme with extents before having ...
3
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0answers
34 views

Building a DEM with both a raster and vector points

So I'm struggling here, trying to get a decent DEM for the Azores Islands because I want to include bathymetric data on it. I have a raster with elevation for the islands (land) with a 30 meter ...
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0answers
33 views

Generating continuous aspect surfaces from DEM with QGIS

I'm trying to extract aspect surfaces from different DEM sources at different resolutions in QGIS. I've had success working with SRTM-derived grids (3-arcseconds) and am trying to perform the same ...
1
vote
1answer
33 views

Extracting coordinates of a triangulation from DEM data

I'm working on the succinct representation of planar graphs and now I'm trying to obtain some datasets to test my results. I saw that Delaunay triangulations of elevation data can be a good source of ...
0
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0answers
14 views

Volume of free space between valleys using arcgis [duplicate]

I'm having DEM and I want to estimate volume of wastes that can be dumped in valley. For that I want to estimate volume of free space between valleys. How should I estimate volume of free space in ...
2
votes
1answer
20 views

Creating Data Elevation Model from two sources

I have 2 Data Elevation Models ( Aster with 30 m resolution and a DEM obtained by stereo with 4 m resolution ). Unfortunatly the DEM with high resolution contains a lot of no data value and some ...
4
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0answers
43 views

OS terrain 50: .vrt from zip files

I tried to follow what was suggested in How to use OS Terrain 50 in QGIS, but I got the following problem: in spite of being generally able to generate .vrt files using gdalbuildvrt from unzipped ...
0
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1answer
51 views

Extracting channel banks from DEM and channel newtork

Currently I am working in project that require from me extracting channel banks. I have been thinking about the best method that I can use to come up with good function that extract the location of ...
6
votes
3answers
110 views

Vertical datum query for coastal modeling

This may be very specific. I have a USGS derived DEM with a vertical datum of EGM96 from NASA satellite data. My Bathymetry uses a lowest astronomical tide datum. Has anybody come across this or ...
3
votes
1answer
67 views

Why do multiple raster processing tools fail with this DEM?

I have a provincial sized DEM. I need to clip it to a fairly large watershed boundary. Should be easy. I've tried: Data Management Tools -> Raster -> Raster Processing -> Clip (Did I make sure ...
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2answers
42 views

Finding average elevations from a Raster DEM, applying those to Vector Grid created with GME

I'm using ArcMap 10.3, and here's what I have: I have an angled vector grid created through GME's GenVecGrid tool which has been clipped to an irregular size and angled relative to the xy axes to ...
3
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1answer
54 views

How to delete obstacles (corduroy road) from DEM in ArcMap?

I have a DEM which looks like this: The narrow longish lift running from north to south is a corduroy road (hope this is the correct word for "planks which allow people to cross a mire without ...
0
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1answer
39 views

Uncompressed size of ASTER DEM tile is 0 Bytes

I have downloaded ASTER DEM tiles(n=400), I have to merge/mosaic them. While doing so I got a problem with one tile which does not merge but displays correctly. I have downloaded it again but still I ...
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0answers
9 views

Inserting ground control points in ASP NASA?

I am using PLEIADES stereo images and  the Nasa software : Ames Stereo Pipeline (ASP) in order to generate a Data Elevation Model (DEM). In addition to that, I have some ground control points and I ...
0
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1answer
21 views

Surfaces and Rasters in DWG format

I have been asked to export a DEM into DWG format, is this possible? The only thing I can think of is to create a regular grid of points and to export this. Also I have been asked to save geotiff ...
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3 views

Is there any publication about TIN MDE file formats like ESRI TIN or ITF?

I would like to cite in my thesis how GIS software deal with TINs both via files and in the memory during execution. Any scientific or technical publication about GIS file formats would be helpfull. ...
0
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0answers
8 views

Create a new DTM with shape [duplicate]

I have a DEM (bare earth elevation) and a shapefile footprint of building. I want to do a hydraulic simulation in this area. Is it possible, with a free software, to create a new DTM where, using the ...
3
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1answer
30 views

Change direction of polylines from DEM data

I am trying to define the direction of my polylines (which represent gutters in a drainage system). Does anyone know if it is possible to define the direction based on elevation data extracted from a ...
1
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1answer
25 views

In qgis2threejs html output select deselect the layers not working

I used qgis2threejs to output 3d model with a dem and another viewshed output. I want to tick untick the layers for displaying and not displaying the layer.But the select unselect option in right ...
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0answers
40 views

Turning simple raster file into DEM?

I'm using QGIS LYON 2.12.1, and I want to turn a plain gray scale raster file (that I got from Google search) into a DEM. The aim is to apply the DEM (terrain models) function to the newly created ...
1
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0answers
21 views

How to create a numerical mask file with the elevation points of an area with QGIS

I'm using QGIS and I have to create a mask file (.txt) as an input for a hydrological model. The file should be a numerical grid map that represents the elevation points of a catchment area, like the ...
3
votes
0answers
76 views

Add a dam to DEM in ArcMap

I followed the instructions how to build a dam by whuber (How to build an artificial 'dam' across a river?) "draw a line segment" "compute the Euclidean distance to this line segment" ...
3
votes
1answer
43 views

Standardising DEM raster for a MCE

I'm trying to complete a Multi-Criteria Evaluation for an MSc assessment and am in the process of standardising my factor maps. Unfortunately, my DEM layer (ASCII file) keeps changing from this: ...
6
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2answers
404 views

best and most accurate free DEM?

I'm working in France. I thought the TanDEM-X was a free and open DEM but that does not seem to be the case. According to a few websites, the most famous free DEMs seem to be ASTER GDEM, SRTM, X-SAR ...
0
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0answers
11 views

Error : LayerRasterRead failed : Imagine Photogrammetry

I'm using Imagine Photogrammetry ( ERDAS ) and I would like to generate a Data Elevation Model DEM based on PLEIADES imagery. When I execute erdas , it seems like he is computing the DEM but after ...
3
votes
1answer
79 views

How to exclude water during contour generation?

I recently acquired a LiDAR data set that included a 1 meter DEM. I generated 1, 2 and 5m contour layers but I am seeing a lot of contours within water bodies. I suspect this is either caused by wave ...
1
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1answer
76 views

Making DEM from contours without elevation data?

I got a shapefile with contours, but no elevation data is present. We can assume as known info, that the contours mark elevations at known steps (say, 20 m). Is it still possible to restore the ...
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0answers
32 views

Why does the flow direction tool in ArcGIS desktop give wrong output (unique values from 1-255)?

I ran the flow direction in ArcGIS, and received unique values ranging from 1-255. I know that these values are wrong, and should be along the lines of 1, 2, 4, 8, 16, etc multiples. The DEM is ...
0
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0answers
29 views

Aster DEM damaged file (N30 E041)

I tried to merge several raster data sets ( from Aster GDEM), but one file is possibly damaged and I get a hole in my raster, see here ...
2
votes
1answer
71 views

How to find a point with highest elevation in area using ArcObjects

Is there a way to find a point with highest elevation in specified area by using ArcObjects? Let's say that I have a raster with DEM and I would like to establish some areas of interest in this ...
1
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2answers
76 views

“ERROR 010214: Unable to read STA of…” while running Arc Hydro Geoprocessing Tools

Today I tried running the Combined Terrain with Unknown Sink and Stream Locations Tool from the Arc Hydro Toolset (version 10.3.0.58, ArcMap 10.3). As input I used a DTM with values between -10 and 19 ...
1
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2answers
120 views

Determining Min and Max elevation in Python using GDAL? [closed]

I have a DEM file and shape file of specific area ,and i want to Create a module in Python that writes name of each area which is shows in the picture, with the greatest differences in altitude on ...
2
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0answers
14 views

Applying colour ramp to DSM in ArcGIS using real elevation values as colour cut-offs?

I have a topo-bathymetric lidar DEM that I need to construct a CSR for in ArcGIS 10.3. I know how to make colour ramps and personalize them, but I'm wondering if it's possible to make a ramp based on ...
0
votes
1answer
21 views

DEM data to Excel using ArcMap?

I have downloaded a DEM from digmap and have opened it in ArcMap. I now want to transfer elevations from each gridsquare into excel to be used in a water routing model. Do you have any ideas how ...
0
votes
2answers
78 views

How to create a reservoir for a dam site?

I have created the watershed for a proposed dam site point using SRTM 90m DEM. Now my task is to create a reservoir or pondage where water would be collected from the watershed. Above a watershed can ...
1
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1answer
40 views

Regarding Atmospheric correction and Elevation DEM Projection system

I am trying to conduct atmospheric adjustment of Landsat 8 image bands using 6s algorithm (i. atcorr grass gis tool). It seems, in the input section, an elevation raster map should be provided. In my ...
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1answer
45 views

Creating contours from DEM for multiple files using ArcMap ModelBuilder?

How can i create an ArcMap model in ModelBuilder to iterate through a folder and applying contouring tool on all tif DEM files on that folder.
0
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1answer
28 views

gdaldem hillshade using command to calculate hillshade of whole folder

I need to calculate hillshade of folder using gdaldem hillshade which has 60 files in it. How can i do it using command prompt window.
0
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3answers
115 views

Why is my DEM in ArcScene flat, not 3D?

I am working with Digital Elevation Models in format TIFF 2km * 2km. As far as I know DEMs should have a 3d function but in my case the DEMs are flat. They only look 3d because of the hill shading. ...
2
votes
1answer
48 views

Looking for DTM for Morocco

I am looking for a DTM for the city of Agadir in Morocco. Could anyone help me to find it?