Questions tagged [slope]

Use this tag when asking questions related to slope analysis.

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Slope Analysis with Python

I am trying to perform a slope analysis using Python and GDAL. The DEMs have a CRS of EPSG:4269 which is NAD83 and a geographic coordinate system. Previous attempts to perform a slope analysis ...
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27 views

General slope inclination in ArcGIS Pro [closed]

I am writing my masters thesis about postglacial seismicity using ArcGIS pro. I am doing a spatial analysis of the area based on a DEM dataset that I have run through the hillshade tool and slope tool....
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9 views

Changing size of window when calculating slope in ArcGIS Pro

I am running a focal statistic using a 2m resolution raster with a 8x8 window (so 16m x 16m) to calculate the "range" across my tile. I also want to do the same with slope but by default ...
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44 views

Calculating Slope from DEM in QGIS

I have a world DEM raster in QGIS in EPSG:4326 with elevation units in meters. I'm trying to get a raster of the slope of the terrain, and I'm doing so using the "Slope" tool under "...
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1answer
35 views

Getting slope from DEM.tif using Spatial Analyst

I have a DEM.tif file and I want to get the slope. I know I use the Slope tool from Spatial Analyst. But, I'm confused which output_measurement to choose from (i.e degrees or percent rise). Basically, ...
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1answer
22 views

Combine slope info with Landsat for classification in Google Earth Engine

I wanted to add slope data as a band to filtered Landsat data. I used ee.Image.cat to "merge" two images. I can see added band in a merged image, but when I perform the classification (which ...
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42 views

SAGA GIS getting 90 degree slope in the whole terrain

I´m studying a jungle area in Peru, and when I try to calculate the slope with the "Slope, Aspect, Curvature" tool from SAGA v7.7.0, I get that the whole terrain has a 90-degree slope. In ...
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27 views

Draw a new curve for each level curve with specific slope in QGIS

I´m new to QGIS due to a project I´m involved in. For this project we want to draw a new curve for each level curve, but with a 0.5% positive slope for the valleys and 0.5% negative slope for the ...
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44 views

QGIS Slope not working properly

I'm new in QGIS and I have been having an issue with it. The thing is that I'm trying to get the slope and relief of a zone. I have the contour lines, from that I created the DEM with 'Rasterize' > ...
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177 views

How to get the slope from an elevation raster in QGIS?

I need to extract the slope from an elevation raster in order to do a species distribution model. It should be quite straightforward, but I can't seem to get it to work. I am running QGIS 3.10 on a ...
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30 views

Slope shows strange grid texture

Being aware that there were already similar questions concerning the output of hillshade/slope layer with an unwanted grid texture, but still I m confused, so I hope someone can explain it. Working ...
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24 views

QGIS Slope Analysis produces strange values [duplicate]

I am performing a slope analysis (Raster>Analysis>Slope) of a US Geological Survey DEM. I am calculating the slope of a raster DEM saved as a TIF. I set up the slope analysis as per the picture ...
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7 views

Clipping and exporting sections of raster from multi-feature shapefile using ArcMap [duplicate]

I have a multi feature shapefile and a slope raster and I'm trying to export images (tif, png whatever) for each feature showing the feature boundary and the slope raster contained within it with a ...
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15 views

Using WCS DEM data for make slope and aspect maps in QGIS [duplicate]

I need to do several slope and aspect analyses (hundreds). Instead of downloading an ASCII for each location, I want to extract/clip the elevation data from wcs and do the analysis. This is the WCS ...
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1answer
32 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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16 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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27 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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13 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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31 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
41 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
31 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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15 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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14 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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12 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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51 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
68 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
59 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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22 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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101 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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41 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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0answers
39 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
37 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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20 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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32 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
30 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
129 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
341 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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17 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
171 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
77 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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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
453 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
69 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
123 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
105 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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