All Questions
Tagged with dem arcgis-desktop
492
questions
2
votes
0
answers
55
views
Strange parallel lines in the middle of the basin
I prepared a stream network for my study area using ArcGIS. Why am I seeing those strange lines in the middle of the map. I used 3 Second SRTM Derived Digital Elevation Model (DEM) from https://ecat....
- 21
2
votes
1
answer
99
views
Using Esri ASCII Grid as DEM + Reprojecting
I've downloaded *.txt files from this site: https://ide.cat/geonetwork/srv/eng/catalog.search#/metadata/model-digital-terreny-5x5-v1r0
I used Copy Raster tool to import one of the files with Esri Grid ...
- 291
0
votes
1
answer
166
views
How do I create a polygon layer of high slope (>58%) area from a DEM in ArcGIS Pro
I am hoping to get from a slope raster (calculated from a 10m resolution DEM) to a polygon of areas above a certain grade (58%). I am using ArcGIS Pro 3.1. I have used the Raster Calculator tool to ...
1
vote
1
answer
106
views
Removing georeferencing from DEM using ArcGIS Pro
I am creating an assignment for students to demonstrate different visualizations of LiDAR-derived DEMs. However, because the DEM is currently unpublished and contains archaeological features, I want ...
- 11
1
vote
0
answers
128
views
Flow direction outputs (ArcGIS Pro: Hydrology Tools) returning 255 values rather than 8 (D8 settings)
I am working with 10-meter resolution digital elevation models to produce flow direction raster images to be used ultimately for the watershed tool in ArcGIS Pro. When I use one DEM at a time, things ...
0
votes
1
answer
51
views
Validating that the smallest channel extracted using ArcMap (Hydrology toolbox) from DEM is the first-order stream
In ArcMap, the 'Hydrology' tool under the toolbox 'Spatial Analyst' can be used to extract the stream network, as described in detail here: extract streams from DEM. One step consists of using a ...
- 141
0
votes
2
answers
200
views
Quickly generate multiple hillshades from DEMs in ArcGIS Pro
In ArcGIS Desktop I would usually use ImageAnalyst app where it was easy to quickly generate hillshade from DEMs that are in data frame. But I can't find anything similar in ArcGIS Pro version, except ...
- 31
1
vote
1
answer
55
views
Adjusting heights of two DTM rasters using ArcMap
I have two DTM rasters of a forest area. The base heights of the winter DTM must match the base heights of the summer DTM.
How can I adjust them using ArcMap?
- 11
0
votes
1
answer
119
views
Determining slope percentage using ArcMap
I am working on a project where I need to conduct a MCA. One of the criteria is: if the slopes are greater than 15%, they should not be used at all. I have DEM model and a slope has been made in ...
0
votes
0
answers
279
views
Identifying (spotting) holes (pits, depressions) on surface using DTM and highlight them
Is there any way to identify all the ”holes” on a surface (DEM, DTM) - (pits, depressions) and highlight them using ArcGIS Pro?
I need for example to highlight all the ”holes” that are more deep than ...
1
vote
0
answers
117
views
Smoothing a DEM with visible grid
I have a DEM (1x1m) whose hillshade shows like this:
As you can see, a grid shows up and that could be a problem for hydrological modeling.
Do you know why this happens?
How can I remove this grid ...
0
votes
0
answers
134
views
Getting blurred image after extracting AOI through shapefile from USGS data
I intended to generate DEM of required location using ArcGIS Pro. Using USGS Earth Explorer, I downloaded the SRTM DEM as a .tiff file for a huge block of area which consists my desired area in it.
...
0
votes
0
answers
102
views
Processing a LiDAR image to be more detailed
I'm using ArcMap 10.8 to try and find old roadbeds. The DEM data I downloaded is very dark and shaded. You can't see anything at lower elevations. I have the hillshade effect turned on but you can't ...
- 1
0
votes
0
answers
47
views
Unwanted line in the raster data (DEM and DEM derived indices)
I am getting unwanted parallel lines in the raster data (see image). I was deriving different indices like slope, terrain ruggedness index, topographic wetness index etc. Prior to calculation I also ...
0
votes
0
answers
59
views
Drainage line do not match DEM stream line using Arc Hydro
I've been running my DEM using Arc Hydro, drainage line output do not match the DEM or the basemap stream.
What could be the problem?
The red line is my stream from delineated DEM, the blue line is ...
