Questions tagged [contour]

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

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4
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2answers
122 views

Create contours based on text attribute of point data (isogloss map)

I am trying to make an isogloss map in QGIS to map dialect differences. I have made a point shapefile in which each point represents a place, and the different pronunciations are put in the attribute ...
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0answers
37 views

QGIS 3.10 create DEM from height contours - the maximum height values of the grid to do not match the maximum height values of the contours

I have created a DEM using contours spaced 10 metres via QGIS grid ITN interpolation method based on height (metres) cell size 10 pixels/metres in QGIS, and another grid of 5 pixels cell size. When I ...
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0answers
18 views

How to display contour labels within QGIS using Maptiler

How can I display contour labels within QGIS using the Maptiler plugin? The contour elevation (height) displays 440m in the Identify Result pannel. Can the Layer Properties be reconfigured to display ...
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1answer
38 views

Does anyone have had a similar problem regarding extracting contours?

I have been working on QGIS 3.10, I am using DEMs files that come originally from Lidar data, so they are large files with high resolution. I have been trying to create contours using the: Raster, ...
1
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1answer
27 views

Export the contour lines of the relief from OSM

My goal is to display the contour lines of the relief in Google Earth. So, I would like to export from OpenStreetMap the contour lines of the relief of a region. My goal is to download the data as a ...
1
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0answers
20 views

Blank Polygon issue using QGIS Contour Plugin

I am using QGIS with Contour plugin, want to generate filled contour polygons with user selected contour levels. However there are some errors showing blank polygons. Is it bug or is there any way to ...
1
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1answer
18 views

No Option to 'Extract' under 'Raster' tab

So I'm running an earlier version of QGIS (3.4.6, as it is supposed to be more stable I'm told) for a Field Geology course, however after installing it and adding DEM data I am unable to 'Extract>...
7
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1answer
134 views

Changing blending of contour label to multiply

I would like to label my maps like these in QGIS (image created using Photoshop): Image of contour label being shown on the contour lines with with white halo and then the colored raster layer above ...
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0answers
32 views

Draw ellipse based on values within an attribute table

I would like to be able to draw and ellipse on a map based on values within an attributes table. At the moment I have 6 transects at a site with values based on IQI (Infaunal Quality Index) values; ...
1
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2answers
31 views

How to create point attribute distribution map in QGIS?

I'm working with multiple species distribution data and am looking at creating what amount to density distribution maps of those species. I have a small number of site locations (18) and only 10 ...
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0answers
36 views

GeoServer WMS has missing features

I have created a WMS service rendering contour lines. The root data is in PostgreSQL. When displayed in OpenLayers many contour lines are missing. After panning or zooming, the missing features may ...
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0answers
18 views

Hiding optional outputs in Model Builder?

I am creating a model in ArcGIS Desktop version 10.7.1 that uses the "Topo to Raster" tool to convert contours (line shapefile) to a raster. The contours are actually representing lines of equal ...
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0answers
44 views

QGIS create contour from DEM

I have created a DEM from points using the raster interpolation method, the TIN function, based on elevation of each point. However, when I try to create a contourline, the results show the contours ...
2
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1answer
48 views

Styling a contour line to indicate the direction of elevation

I've just got a slippy map set-up using Mapnik to render OpenStreetMap data. I've loaded SRTM elevation data following the PostGIS steps here and can now see contour lines on the map. I'm trying to ...
0
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1answer
26 views

Splitting GEOTiff of Mars

I am trying to make a map of a terraformed Mars in QGIS and as a part of that, I need to convert the Mars MOLA DEM into contour lines at an interval of 100m. However, the file is too big for QGIS to ...
0
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1answer
52 views

Getting elevation data from DEM

I'm trying to extract elevation data from a DEM file but I can't make it work. I want to extract contour lines from a given area, and label those lines with the proper elevation value. The problem I'...
1
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1answer
71 views

How to extract contours from .jp2 DEM dataset?

This will be a little long-winded but I'm including all information I consider relevant. Problem: I have received a data set from a municipality that is a 3-layer LiDAR JP2 DEM and need to extract ...
0
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0answers
18 views

Add buildings contours to DGM for hydraulic analysis [duplicate]

I use Hydrology Terrain Analysis Tools in QGIS/ArcGis. Now i try to add some building contours to my DEM. I got building Data (Polygons) and a Raster DEM. Finally i want the buildings added to my DEM, ...
1
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1answer
66 views

QGIS Wrong “ELEV” values from contour

My problem is that I'm trying to extract contours and elevations from a DEM map. Everything else looks fine, but I think that the "ELEV" values I'm getting are not the real elevations, maybe I'm ...
0
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0answers
28 views

Cannot add Contour to layers

I am brand new to QGIS as my uni has shut down but we still need to do our coursework they have asked up to make a bathymetry map on QGIS. It is a very simple map of sounding data we have taken and ...
1
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0answers
56 views

Conditional formatting QGIS Legend

I use QGIS to create surface plots for measurements made in the field. I use the contour plugin. I usually create ~50 contours in order to make a smooth surface. When I use print composer, I generally ...
1
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0answers
46 views

Using of ContourGenerate in PyQGIS

Can anyone help explain me how to use the ContourGenerate method of GDAL. The official documentation states two sets of arguments for the method, with one being ContourGenerate ( **args, ***kwargs ) ...
2
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0answers
48 views

Use edge detection to segment images

I have an RGB from which I detected the edges and I'm curious if I can use it to optimize a segmentation or as a mask to improve the segmentation to identify cultivated fields. Could you do that? If ...
1
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0answers
37 views

Creating Contours in Feet? [closed]

I'm fairly new to QGIS and GIS altogether. I'm curious if it's possible to generate contours from a DEM in feet, as opposed to meters. I'm hoping to then have my labels in feet.
2
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1answer
98 views

Creating contour lines from DTM in PostGIS

Is there any possibility to compute contour lines from a raster DTM directly in PostGIS on a PostgreSQL database? I have only found this solution based on points "Fast contour lines using plain ...
0
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1answer
46 views

QGIS - Automatically find and merge adjacent lines in large data set

I need to merge adjacent lines in QGIS 3.8, but am having trouble coming up with a way to identify and then merge them in a large data set. (3.8 is as far as my Mac can support) I tried to convert my ...
0
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1answer
47 views

Using QGIS to convert from WGS to UTM not working

My predicament is this. I have inherited a bunch of data in multiple projections, and I need to calculate hub distance to get distance from one grid of points to a contour layer (I have extracted ...
-1
votes
1answer
32 views

Creating a greyscale bathymetry map of the world in QGIS

I am looking to create a greyscale bathymetry map of the world in QGIS which I can then output as SVG contour lines. Maybe there is somewhere where I can find and download greyscale vector tiles of ...
2
votes
1answer
55 views

Show all contour line labels in Layout in QGIS

I created a map with labeled contour lines. When I am now adding the map to the layout view not all labels appear (e.g. 2000, 2500 and 3500 meters has a label, but not 3000) [. In the original map ...
2
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0answers
72 views

Smooth contour lines/correctly extract contour lines from a DEM in QGIS

I have a DEM obtained as a result of the interpolation of elevation points TIN Interpolatin: I extracted the contour lines in QGIS and the result is this: After I tried to apply the Line Smoothing ...
2
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0answers
23 views

Using QGIS Webmap with Mapbox

Im trying to produce a contour map using QGIS and exporting using Mapbox. The map is rotated 90 degrees in QGIS and it returns to its normal orientation if I use Leaflet. Unfortunately, using the ...
1
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1answer
50 views

A simple way to merge lines separated by a space in QGIS

In QGIS after creating contour lines by extracting them from a DEM (Extraction > Contour) and smoothing them (Line Smoothing) I noticed this situation: In order to smooth out the corners ...
3
votes
1answer
41 views

QGIS - Combining contours without elevation and point elevation data

I have a geopackage (Ordnance Survey Terrain 50) that has two layers: a layer with contours but no elevation data, and a layer of point elevation data. I'd like to create a DEM. The technique I've ...
4
votes
1answer
68 views

Align labels on a vertical line

I have a series of contour lines with relative elevations (Z value). I am trying to align the labels so that they are all on the same imaginary line. It's a process that I usually do with Autocad ...
3
votes
2answers
119 views

Unfinished Layer with QGIS Contour Plugin

I am using QGIS 3.4.13 Madeira on Windows 10 I have an issue with the QGIS Contour Plugin. I have two point layers, they contain about 45'000 points in the exact same locations. The only differences ...
2
votes
1answer
66 views

Batch import of DEM tiles (with shapefiles) into PostGIS creates non continuous contour lines

I want to import a large amount of ASTER DEM data into PostGIS (covering Europe). I use this script: https://wiki.openstreetmap.org/wiki/Contour_relief_maps_using_mapnik#Importing_ASTER_GDEMv2_data ...
1
vote
1answer
15 views

Incorrect tiles from a shapefile are generated by mapnik

I used mapnik_node_tile_server to generate tiles from a shapefile created by gdal_contour. The tile generation function is: function fetchTile(layer, z, x, y, callback) { var map = new mapnik.Map(...
5
votes
2answers
550 views

Making elevation contours of raster smoother using QGIS

I am using QGIS 3.6. I have raster of Europe map which I want to make a colored relief model. After duplicating the layer, used hillshade on backward layer and colored the upper layer interpolation >...
1
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0answers
116 views

Contours generated in Leaflet losing coordinates?

I am attempting to use a JavaScript library to generate contours in a leaflet map from a point layer on the map. I have tried this approach with d3 and turf and am getting the same issue where the ...
1
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0answers
34 views

Calculating sink volume in R via rgrass7

I want to calculate the volume of sinks in a DEM raster in R, since I have to automatize the workflow later. Following the results of my previous question (Creating depressionless DEMs with rgrass7) I ...
0
votes
0answers
41 views

Using topo to raster tool on temperature contours and getting error 010089?

I am using the Topo to Raster tool in ArcGIS Desktop 10.5 on a global temperature contour shapefile and keep getting this error: ERROR 010089: C:\Users\workspace is not a supported feature type. ...
1
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1answer
75 views

How to make a polygon from contour lines extracted from a raster QGIS 3.6?

I'm trying polygonize the elevation level 200 m of Europe map from raster GeoTIFF (The raster is projected in EPSG:3120). At first I tried with Raster > Extraction > Contour, but the lines are ...
0
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0answers
36 views

Estimating Missing Contour Segments using ArcMap

I am trying to estimate the missing contour segments shown below and was wondering if there was any features available in ArcMap that would make this possible. The contours were made from point ...
1
vote
3answers
66 views

Calculating mean of Z in ROI in Surfer

I was wondering if it was possible to calculate the mean of Z in a ROI in a Surfer Contour map. To be more precise, I have the map of a chemical element of an object that I converted into a XYZ ...
1
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0answers
13 views

Add elevation to contour vectors using sequential numbering by drawing a line

I have several contour lines and I want to add the elevation as attribute. I found a tool in ArcGis Pro that would do exactly what I need, select the contours with a line, specify the starting value ...
2
votes
1answer
136 views

How to digitize a feature to include elevation data and interpolate slope in QGIS

I would like to take this archaeological drawing and use QGIS to create a something similar to a DEM or TIN, so that depth/elevation values can be quickly and clearly understood. I do not know what ...
0
votes
0answers
23 views

Converting Historic Elevation into a TIFF or DEM file for 3D mapping

I am working on a project that shows the development and geological changes to a stretch of coastline around St. Augustine, FL over the past 160 years. I hope to create a series of map scenes that ...
4
votes
2answers
197 views

Automating vector data entry in QGIS

I have a vector contour data(polyline). I want to add values to each contour lines. Means I want to digitize my contour lines with proper values. Those values are with me in a paper. I'm adding those (...
1
vote
1answer
78 views

Automating vector data entry in ArcMap

I have a vector contour data(polyline). I want to add values to each contour lines. Means I want to digitize my contour lines with proper values. Those values are with me in a paper. I'm adding those (...
2
votes
1answer
209 views

How to create contour lines from TIFF (raster with more than 100 bands)

I need to do batch processing from a raster with 120 bands (GeoTIFF). I need 120 contour line shapefiles, but I get only one. I had no problem when the result is another raster file with all the bands,...

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