All Questions
Tagged with dem spatial-analyst
78
questions
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 ...
2
votes
0
answers
51
views
Using LiDAR-Derived DEM to Identify Aerial Sewer Lines
I am trying to come up with the best process for identifying aerial sewer lines (typically over streams) using the pipe inverts and a LiDAR-derived DEM. In other words, locate the lines where the Z ...
- 41
0
votes
1
answer
123
views
Digitizing topographic contours to produce DEM from it using ArcMap
I have four topographic maps spanning 60 years all of which have the same scale (1:62,500). I have digitized contours (5 feet interval, 4 contours 285, 290, 295 and 300 feet) of the same section in ...
- 109
1
vote
1
answer
104
views
Expanding river width on raster based DEM in ArcMap [closed]
How do I expand the river width on a raster based DEM in ArcMap?
For example, my DEM has 20 m cell size, and I want that my river is wide 3x that everywhere (60 m in total, or 3 cell wide). I have ...
- 31
1
vote
1
answer
20
views
Quickly digitising several polygons based on classified raster output using ArcGIS Spatial Analyst
I have a raster DTM of a river which I would like to split into 90 sections, each measuring 125m. I have used Euclidean Distance to outline each section by reclassifying the symbology to change colour ...
- 358
0
votes
2
answers
325
views
Using ArcGIS to split a raster DTM of a river valley into equal parts/sections?
I would like to split a raster DTM of a river valley into several (maybe 30) equal sections. The raster currently follows the river channel and so is not a straight line but bends and moves like a ...
- 358
0
votes
1
answer
640
views
How to get elevation value in CSV format in R from raster SRTM DEM file?
I am trying to get elevation value in meter using R programming.
I have loaded raster library in rstudio:
elevation <- getData("alt", country = "BD")
How I can get those value with lat lon? ...
2
votes
2
answers
335
views
Stream Feature generated from DEM is missing data
I tried to search other questions to see if this has been answered but couldn't find anything, so sorry if this is redundant. I use the Hydrology toolset in Spatial Analyst to create a stream feature ...
0
votes
1
answer
297
views
Comparing Slope among various DEM resolutions?
I'm comparing the slope products derived from DEMs of various spatial resolutions (1m, 10m, 30m) for a set area.
The trend I find is that as the resolution improves, the areal extent of various ...
- 99
0
votes
2
answers
2k
views
Applying low pass/median filter over DEM in GeoTIFF format using ArcGIS Desktop?
I want to apply a median/low pass filter (over a few hundred kilometers) over my DEM to reduce the noise. I tried ArcGIS focal statistics tool but no luck. I got a blank GeoTIFF file.
How can I do it ...
- 11
1
vote
0
answers
74
views
Join DEM and GPS data point ArcMap
I have a problem using ArcGIS. I have generate a DEM raster with a 3D online software and exported it in ArcGIS. So I have a raster of my surface. After that, I have some GPS point (x,y,z) that we ...
- 11
0
votes
0
answers
98
views
Flow Distance Not Calculating for Entire Raster
I am trying to calculate the height above the nearest stream for an area. The problem is, it only does so for a portion ( the colored area below) of my area of interest. In the pic below, the black ...
- 450
0
votes
1
answer
507
views
Line of Sight Analysis using Points and DEM
I have a DEM and a point feature class with the elevation value from the DEM as an attribute plus with x number of feet added to it representing a tower location.
I would like to do a line of sight ...
- 55
0
votes
1
answer
346
views
Converting DEM units using Map Algebra and Python
I am trying to write a bit of code that combines a bunch of DEMs that match up perfectly and convert the elevation values of the pixel cells from meters to feet. This is all using Pyscripter and ...
- 345
2
votes
0
answers
35
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 ...
- 81