Questions tagged [contour]

Contour maps depict spatially-varying values, such as elevation, by means of curves of equal value.

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18 views

Labeling contour lines in ArcGIS Pro when contour lines are raster data

I am running ArcGIS Pro 2.8 on Windows 10. I have a DEM from which I am generating contour lines. In the map layout, I would like to have every 5th line labeled with the elevation value. When I use ...
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1answer
34 views

Elevation contour lines with footage calls

Does anyone know how to create contour elevation lines? I've never done it before as I am using ArcGIS 10.8. I am unable to find any datasets online for my AOI. Is this possible?
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27 views

Calculating the area individually enclosed by multiple contour lines in R (SpatialLinesDataFrame)

Aim Calculating the area and perimeter of each individual contour line (SpatialLinesDataFrame) extracted using raster::rasterToContour(). Issue In spite of my web searches, I seem I cannot find a ...
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1answer
47 views

Batch Processing Contour Lines in QGIS

I'm trying to create contour lines at 40 meter intervals from 60 different DEM Contour Shaded files. Rather than doing them 1 by 1 I have tried using the batch process but I don't get any results as I ...
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26 views

Interpolation QGIS produces a black box

I have a number of points on a map, each with a numeric attribute taking values from 1-9. The points with attribute equal 1 should have the highest density representation, and the points with ...
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47 views

Whitebox tool not in QGIS 3.16.5

In QGIS 3.16.5 I can not see a whitebox tools to create contour from raster. Why the whitebox tool does not appear in my QGIS version?
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17 views

Topo-to-raster/anudem, entering lake polygons with elevation values

I am entering lake polygons that have elevation values as "Contour" input to topo-to-raster which I thought was correct, the documentation says: "If the elevation of the lake is known, ...
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39 views

gdal_contour: Specifying index contour lines

I'm building an application where I need to programmatically generate contour lines(and export to a .dxf) from a raster terrain data-set(DTM specifically). What I've tried: Using gdal_contour, I've ...
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1answer
59 views

Printing geographical centroid coordinates of georeferenced image in CSV file

I am trying to print the centroids of the circular contours from the image. The image is already georeferenced using GDAL with ESRI 102025 and I tried to extract the points in terms of the ...
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1answer
86 views

Enclosing contour lines along edges

I have contour lines that I am converting to polygons. Contours along the edge are clipped so are difficult to simply convert to polygons. So I'm trying to find an automated way to do this within QGIS....
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33 views

QGIS - How to create contours based on values of a ramp

When creating contour on a raster, is it possible to create them based on values specified in a colour ramp ? I only see the option "Interval between contour lines"... Or maybe by using gdal?...
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70 views

Heatmap with Contour Polygons

I have point data off the coast of Oahu. Someone else used these same data to create two polygons (approximated by me in the figure below with the green and red hand-drawn boundary lines). I believe ...
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1answer
78 views

contours not saved

I have generated several bathymetry layers using the contour plugin. These are saved in memory. I have installed the memorylayer saver plugin which recognises the layers concerned. When I try to make ...
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1answer
35 views

Contour Lines exported as raster in Illustrator

I am trying to export contour lines from arcgis to illustrator to finish the map. I have tried to export the map with "vectorize layers with bitmap markers/fills" option, but it still opens ...
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1answer
49 views

Making polygons from interpolated points in QGIS

I need to know the extension of the area of a lagoon according to depth classes. I started from a point shapefile containing depth values and used the interpolation plugin and I obtained a raster file....
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33 views

Grid from SAGA natural neighbor results in black grid

I'm new in QGIS and I'm following tutorials mainly on YouTube so I created a path in Google Earth then exported to kml which is converted to txt via GPS visualizer. When added delimited layer it shows ...
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1answer
35 views

Extract the mean elevation from a raster by a mask with several spatial objects

I am working with a glacier and I want to get the Hypsometric curve of the elevation difference between two time periods. I divided the mask of the glacier by the contour lines (each 50 m) and now I ...
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1answer
19 views

Contouring in ArcGIS from raster file yielded rectangular contours

Why does Contouring in ArcGIS using Contour tool in ArcGIS from raster file yielded rectangular contours? The attached image of contour is shown below The contours shows a rectangular gridded ...
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38 views

Making Ridge Line and Valley Line from Contours or DEM using SAGA GIS

How do I make ridge lines and valley lines using open source GIS Software? I am totally stuck. I found solution in SAGA GIS - also available in QGIS but it freezes when I run it. http://www.saga-gis....
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2answers
58 views

Generate Contour Plugin

I have 6 point .shp files wich contain elevation data, the first 3 files are rather small (about 200MB for the shp and 1GB for the dbf) and the last 3 much larger (500MB .shp and 3.5GB for dbf). I ...
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1answer
33 views

Fix unwanted sink contours from hydrologically correct DEM

I am creating contours from a DEM that has been hydrologically corrected via a Breach Depressions algorithm. The DEM is coloured light grey to dark grey (top to bottom), the stream is in blue and the ...
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40 views

Feature to polygon tool not recognizing closed contour lines

I am using the Feature to Polygon data management tool in ArcMap (v.10.7.1) to convert contour lines (above 1200m) to polygons. The contour lines are closed (beyond the extent of the picture which is ...
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1answer
82 views

Creating line that follows lowest elevation on contour map in QGIS

I have a shapefile of contours that I generated from LiDAR data on QGIS. I'm trying to create a line that follows the lowest point of elevation across the entire map that follows a ditch (it's a long ...
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1answer
64 views

Creating a DEM from irregularly spaced contour lines in QGIS

I'm using QGIS to work with a contour line shapefile with contour lines that are not spaced evenly (e.g. not just 100 meter elevation increase between each line). The increase ranges from a 100 meter ...
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0answers
143 views

Problems when importing shapefile with the Blender GIS add on from QGIS: contour lines appear flat

So I'm trying to import a shapefile of contour lines of groundwater isohypses that I have loaded into QGIS and saved separately. I'm actually following the steps of a online tutorial of our department ...
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135 views

LiDAR download - ASC file to QGIS - Rasterize ->Extract -> COntour - Export to Google Earth Pro

I am trying to create a 50cm contour map using QGIS and then export it as KML to Google Earth Pro. When I get to Earth and import the KML file I am left with random red lines around the globe. The ...
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1answer
74 views

Creating Contours from Raster using PyQGIS

I am trying to create contours from a raster layer I have loaded in my QGIS project as below using gdal from qgis.core import QgsProject import processing ## QgsVectorLayer('Coordinate','Layer name','...
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16 views

Using reclassified raster to make contours, contours contain the class value instead of height value

I reclassified my raster to 12 classes and used the contour tool to make contours from there (they are much smoother). The issue is, the contour lines no longer contain the raster height, they ...
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1answer
88 views

Merge Contour Boundary for Polygons QGIS

Hoping this is fairly simple but haven't been able to find much online. I am trying to create some elevation polygons from a DEM model. Right now I am getting this after getting the contours, ...
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0answers
43 views

Adding labels to contours created with the rendering option of rasters in QGIS 3.16

Is it possible to add labels to raster contours created using this option in the "Render Type" under "Raster symbology"?
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36 views

Convert contour shapefile to MicroStation dgn file in QGIS

I have a contour shapefile in QGIS with labels on (elevations for labels). I am able to convert it to MicroStation dgn file but the elevation labels of the contour shapefile are not converted with the ...
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342 views

XYZ LiDAR data to contours with QGIS

I need to prepare a 1m contour map for an area with LiDAR data (XYZ files, in a 1m grid). The files are a little large and there are 54 of them. I merged the files to a single XYZ file (which turned ...
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42 views

Plotting contour map for geodetic data

I need to plot contour plot for a geodetic dataset.I have data for 94 locations of New Zealand. I have been able to generate a map a New Zealand using cartopy library of Python. I have used python's ...
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1answer
39 views

Area commanded from given point

I want to define the area below a contour that slopes at a particular angle (say -0.05%) from a particular point, for many points. I have a DEM, and can compute contours at a particular level (say 200 ...
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27 views

Plotting contours for geodetic data.(in Python)

I need to plot contour plot for a geodetic dataset, but I have data for 15 locations of New Zealand. I have been able to generate a map a New Zealand using cartopy library of Python, but I am not sure ...
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1answer
121 views

QGIS: Creating contours at a certain elevation from DEM that match a value from a polygon layer

Trying to create contours from a 1m DEM at certain levels only when the contours fall inside a polygon with an field containing the desired contour elevation value. See images below. For example in ...
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0answers
48 views

GDAL warp & GDAL contour inconsistent results

I am creating 2 output contours based on the same input DEM, one is clipped to a smaller grid feature (green line) while the other is clipped to a larger irregular polygon (blue line). The problem is ...
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1answer
58 views

Connecting contours in ArcGIS

I am using ArcGlobe. I created contour lines using the contour tool, but some of them are not connected and are just fragments of lines, is there any tool that could connect these lines?
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1answer
67 views

FME SherbandGeneralizer - estimate time for "Optimizing Memory usage"

I have a workspace with a pointcloud of 240.000.000 points as input, goal is generalized countour lines, that do not intersect each other. The workspace mainly consists of (cp. screenshot) ...
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0answers
60 views

Deleting holes of contour polygon in QGIS

I'm trying to create hypsometric areas from a DEM. My current workflow in QGIS is: Extracting contours with SAGA, as I need contours from specific elevations (250, 500, 1000...) and not just every x ...
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36 views

Contour polygon created at different intervals than the desired interval

I have a DEM in WGS84 coordinates with a minimum elevation of 2083 meters and a maximum elevation of 3000 meters. I then used the Contour tool in ArcGIS 10.7 to create contour polygons at an interval ...
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47 views

How to export QGIS Contours to be compatible with 12D Software

I have processed my aerial drone survey images with Ground Control Points using AgiSoft. My accuracy and results were good. I have exported the DEM into QGIS and generated the Contours with labels etc....
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1answer
33 views

Merge features in same feature class on same attribute

I have a feature class of lake contours. This feature class is the result of multiple lakes' contour data being appended into my Contours feature class. I now have over 300,000 lines of contours, and ...
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1answer
48 views

Contour lines are somewhat square-ish?

I am exporting contour lines from a raster file which was obtained by clipping a shapefile to a much larger raster file. The contour lines obtained are square-ish as in the second image below. My ...
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0answers
192 views

Having trouble with the Heatmap's (Kernel Density Estimation-KDE) interpretation in QGIS 3.10

i wanted to generate a density/concentration map of a parameter, in this case Carbon percentage in a water sample. The dataset in csv file looks like these : So, I imported the csv file then plotted ...
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0answers
26 views

Speed up colouring of contour lines by creating new layer?

Related to my previous question: Colouring contour lines differently when they are inside polygons of another layer I would like to create a new layer based upon the result of the geometry generator ...
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1answer
140 views

Colouring contour lines differently when they are inside polygons of another layer

I'm a complete noob to QGIS. I am working with New Zealand Topo 1:50.000 data from LINZ. I have snow polygons and over them contour lines. Where the lines cross the polygons I want to change the ...
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0answers
49 views

Writing "m" after contour line label numbers

does anyone know what is the expression to display the letter "m" after contour line numbers in Arcgis? I want it to be like this. I believe is in this window wizard, just don't know what ...
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0answers
90 views

Invalid geometry type after clipping

I have two files (.xyz) with point data from a terrain. I'd like to create contour lines of said terrain but in a smaller area (limited by a polygon). After importing the points in two layers, I merge ...
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1answer
113 views

Change Stroke Width of a Polygon PyQGIS

I'm trying to set the Width of the lake's contours to zero or change the color to light blue, since the I dont want to see the black outline. The vector file is a Polygon (MultiPolygon) named vlayer2 ...

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