Questions tagged [slope]

Use this tag when asking questions related to slope analysis.

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13 views

Why does the slope raster not align with the DEM?

I created a slope raster from a DEM raster using the Slope tool in ArcGIS 10.7 desktop. I snapped the slope raster to the DEM (but not the processing extent). The slope raster is the same projection ...
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1answer
25 views

Define point locations in relation to slope [closed]

I have a dataset of settlements that I would like to put in relation with slope and aspect layers that I have made to see if there is a preferred altitude or direction (facing north or south, etc.) ...
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12 views

Vegetation detection of anthropic crops with Google Earth Engine

I am very new using Google Engine and I need to know how to detect only agricultural crops on slopes without them mixing with that natural vegetation on hills. I have tried different indexes (like ...
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23 views

How to use QGIS Raster Calculator for computing slope?

I am using QGIS 3.10 in my Windows 10. I want to create a slope of a DEM layer. First I used "Slope" in the Raster Terrain Analysis. Then I used Raster calculator to find the slope less than 10. The ...
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10 views

Creating line profile graph in ArcGIS Desktop 10.6 with 3D Analyst for multiple line features

I'm looking to create profile graphs for approximately 150 streams in a 3D feature class. I made a sample profile graph but I'm not sure how to automate the process to run through the remaining lines.
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1answer
22 views

QGIS Rastercalculator: unexpected results for cos() function

I've calculated the slope values of a DEM and created a raster with values from 0 to 51,3 (degree). I wanted to calculate the Cos of these pixel values with the Raster calculator (to calculate in the ...
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23 views

How to remove slope from DEM to better visualise topographic features of vriver systems in QGIS

0 I have a DEM of a river channel that i would like to remove the overall slope but retain features such as pools, riffles, bars etc. I have used the River Bathymetry Toolkit (detrending tool https://...
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1answer
38 views

Empty result layer was created by raster calculator

I'm a new user of QGIS and learning some tips from this book https://www.amazon.com.au/Learn-QGIS-Andrew-Cutts/dp/1788997425. I'm currently practising how to use raster calculator to find areas at ...
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1answer
23 views

How to determine the individual slope values of GPS point features in ArcGIS Pro

I have created a geodatabase raster displaying the slope of a region's terrain and have a number of GPS points which I uploaded into ArcMap (using the GPX to features tool). The points are locations ...
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17 views

Altitude information for European highways

I need to calculate the gradient in major European highways. Fot this I need altitude data for each highway, let's say every 100 meters. Are there such kind of data publicly available? If not, I am ...
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14 views

How to find all cells within a neighborhood with slopes towards the center?

I would like to iteratively go through each cell in a raster in arcGIS that meets criteria (already established as per below description) and find the percentage of cells in a several km neighborhood ...
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12 views

ARCGIS-Slope map with different X and Y cell resolution

I have a tif DEM with different resolution in X and Y : cell size x =0.000222222222222222 cell size y=0.000111111111111111 with col=4501 and row =9001. The resulting slope map that I have is a tif ...
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10 views

Modifying existing DSM from new slope raster layer for optimizing solar panel in solar radiation tools

I would like to calculate solar radiation of some building roofs using area solar radiation tools in ArcGIS Pro. However, I need to modify my DSM (input raster) because I want to optimize the panel ...
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43 views

Extract soil and slope data using coordinates

I have no experience at all in GIS and I'm trying to extract soil type and slope data. All I have is a CSV file with latitude and longitude coordinates. Is it possible to use this to extract the ...
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1answer
54 views

How to extract slope value for a geometry point in GEE

I want to extract slope values for various points in a certain region. Below is my current code which visualizes my region of interest on the map viewer // dataset var srtm = ee.Image('USGS/...
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1answer
41 views

Altitude point layer to slope heatmap in QGIS

I have a vector point layer (grid of 100km x 50km, a point every 20meters = 12.500.000 points). It has an altitude attribute. I would like to have the information about the slope. I guess I need to ...
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20 views

Break of slope polyline from raster

I am looking to create polylines that define the break of slope along a cliff line. Using LiDAR data I have created a slope raster using r.slope.aspect in QGIS. This nicely displays where the breaks ...
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98 views

Slope obtained with GDAL has weird lines

I am working with this DEM obtained using terraincache, it uses mapzen data. The SRC is WGS 84. I ran this GDAL command to get the slope: gdaldem slope -s 111120 dem.tif slope.tif (I had to do ...
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12 views

Highlight sparse pixels in a generated raster layer

I've been loving QGIS and need some expert help. I have a project where we need to highlight areas with slopes greater than a set number. I currently do this by processing the DSM with Slope and ...
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0answers
36 views

Slope and hillshade layer not continuous in QGIS

I have been trying to create slope and Hillshade rasters from a DEM raster, which is in UTM11N. I tried different ratios (vertical to horizontal) but everything is in meters so it should work fine. I ...
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36 views

Slope analysis in QGIS [duplicate]

I have a 1/3 arc-second DEM downloaded from USGS that I am trying to use to create a slope analysis layer. The DEM is in ESPG 4269 to start and I've re-projected it into NAD83 UTM Zone 11N (the DEM ...
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1answer
34 views

QGIS Raster Mask Layer?

I have a raster slope layer and a raster aspect layer. The slope layer is single band grey, that is black to white, with white as the steepest slope. The aspect layer is pseudo colour. I'd like to ...
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1answer
58 views

Identifying slopes surrounding a lake (in ArcGIS)

I'm working with ArcGIS 10.7 to investigate lakes in the mountains. I have created a 2km "hazard buffer" around every lake-TIN showing instable slopes (>40°) above the lake surface from where a ...
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19 views

Incorrect slope values for points in QGIS [duplicate]

I'm trying to determine the slope of sampling points in QGIS 3.4, but the values are all ~89.99°, which I know is incorrect. Pretty sure it's an issue when creating the slope raster. Based on the ...
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31 views

Create a land-use raster in which the “crop cells” are distributed in dependency on the slope?

I have a geo-"scientifical" question. If you don’t know the answer, but have a hint how to search for the solution, this information would be helpful as well! In Germany we do not get land-use data ...
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1answer
29 views

Seeing heights in Landsat 8

I have downloaded some DEM from Landsat 8 from usgs website. when I opened the compressed file I saw some Tiff files and two text files. I opened the txt file using ArcGIS 10.7 and it contains many ...
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1answer
29 views

Slope and side-slope of vineyard rows

I have a question about interpreting the slope and side-slope of vineyard rows using a line vector layer and a DEM. I am trying to calculate the slope along the row (split into 2 meter lengths) as ...
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1answer
72 views

Obtaining slope and aspect for points in QGIS

I'm new to QGIS. I have GPS points uploaded to QGIS and a ⅓ arc-second DEM (USGS) of the area. I'd like to generate slope and aspect data for each point. What is the best way to do this? The ...
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1answer
219 views

Technical documentation for GDAL Slope

I was running a gdal slope calculation on DEM I had gdaldem slope B:/data.tif G:/slope.tif -of GTiff -b 1 -s 1.0 and I need to find the concert documentation on how the slope is calculated. https://...
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16 views

Analyzing Sonoma County's topography/slope in 2017 fires

I am looking to create a map of sonoma county's topography. I am looking at one of the components of a fire: slope. I want to first isolate sonoma county, which is easy enough to do, after that ...
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3answers
135 views

Using QGIS polygonize tool to create discreet slope polygons

I am trying to create a shapefile with polygons representing areas of different slopes. I am running into some problems using the following workflow. I start with a digital elevation model and using ...
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0answers
67 views

Correcting slope of river bed on DEM using QGIS or ArcGIS

I have a DEM that has incorrect value of altitude/slope in the river bed area. This is a result of the interpolation of elevation value that are close to the river and creates lots of errors. In fact ...
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0answers
27 views

Reclassify slope raster

I want to reclassify a slope raster as part of Least Cost Path Analysis, but I'm a little bit confused about the reclass rules. My rules look like this at the moment (numbers left are degree): 0 ...
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1answer
416 views

Average Cross Slope Calculation

My county ( Pima, Arizona ) uses a number called “average cross slope” which they define as ACS = (I * L)/A where I = contour interval L = length of contour lines in the area A = area ...
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0answers
62 views

Slope and Aspect calculations giving wildly different results based on zoom using Leaflet

I asked Accessing slope and aspect data using Leaflet? last week about getting slope and aspect as a function of lat and lng in leaflet, and I am in the process of trying to code out a good answer. ...
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1answer
108 views

Accessing slope and aspect data using Leaflet?

I am building an application in leaflet, and I need to be able to access slope and aspect as a function of latitude and longitude. Currently I am able to get elevation data from the mapbox elevation ...
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0answers
86 views

QGIS Slope analysis thinks elevation unit is degrees making all slopes 90 degrees or 0 degrees [closed]

When i run my slope analysis the output has only two values: 0 and close to 90 degrees. The only way I have found to solve this is using a z factor of 1/111,120 which is the conversion of degrees to ...
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1answer
62 views

How do I view and export table with slope data for raster and TIN?

Using an original point file, I created a DEM raster with IDW interpolation as well as a TIN. I used surface analysis to create 3D slope layers, one with degrees for the raster (IDW) and one with ...
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1answer
56 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 ...
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0answers
25 views

Correcting forestry acreages due to slope to get actual acreages treated [duplicate]

I came up with a process to get actual acreages vs map acres of steep slopes, but I am wondering what others do to correct for steep slopes and get actual acreage treated? For mine, In ArcGIS Desktop, ...
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1answer
113 views

Calculating average slope using ArcGIS Pro?

I want to rate for ease of walkability for one track, I have a road shapefile and raster of the slope. Any ideas about how to calculate average slope or other methods to do that?
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1answer
63 views

Which layer for least cost analysis?

I'm new to least cost analysis. I have a DEM-layer of a region and I want to know what's the least cost path from a to b. Do I have to use the DEM layer to calculate that? I also have a hillshade ...
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2answers
199 views

Labeling DEM or slope layer with slope angle in degrees?

I have a shapefile and made a DEM raster to create contours and slope analyze puttinggreen for a golf area . I have all i need except the slope values in degree (labeled directly in the map along with ...
1
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1answer
504 views

Digital Terrain Analysis - Roughness Index [closed]

Currently I am working on a project dealing with terrain analysis based on a DEM. I came across the term "roughness index" using slope values from that specific DEM. On YouTube I found a video, which ...
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0answers
55 views

Calculating variable buffers using slope between river and point 100' away using ArcGIS Pro?

I have a network of streams that I need to buffer based on a basic rule set. This buffer will depend on the slope. The slope is determined by the looking at the difference in elevation between a ...
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0answers
95 views

Extract longest flow path in ArcGIS pro

I did calculate Hydrology with Spatial Analysis tools==> Hydrology and now, I have streams and Watershed. In each watershed, I need to extract the longest Flow as a polyline for calculate slope. What ...
3
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1answer
233 views

GRASS GIS producing different slope than GDAL?

When producing a slope in GRASS GIS 7.4 the results are different than with QGIS (GDAL) and ArcMap for the same input data and same parameter (Z ratio is 1.0 and degrees). QGIS and ArcMap generate ...
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2answers
166 views

Adding slope values to attribute table (QGIS 3)

I have a DEM raster and some points (one .shp for all points) plotted on it. I would like to know if there is a way to add the slope value of the pixel that each point is located in the attribute ...
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1answer
229 views

Using QGIS 3.2 to add slope and/or % grade to county-wide street layer?

Using QGIS 3.2 what is the best way to add slope and/or % grade to a county-wide street layer using the following data: Streets (polylines) = 35k records (10mb) Contours (polylines) = 500k records (...
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0answers
85 views

Extracting slope of aspect information using QGIS?

In What is SOA (slope of aspect)? @Spacedman explained to me what SOA means. Now I need help to understand how I could work with it and extract the data that I want. I want to use Qgis (with Grass ...

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