Questions tagged [contour]

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

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2
votes
1answer
55 views

Plotting sample stations upon contour line in QGIS?

I need to create point sample stations on two contour lines (-10m and -20m). What I'm intending to do is, put markers (circle with stroke) on the contour lines, with equal distance from one point to ...
3
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4answers
7k views

How to clean up contours?

I have .dxf file with contour lines representing elevation. But this contours are too "ugly" and elevation model looks just bad. As you can see on image, contours are not continuous... Is there any ...
1
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2answers
52 views

Missing Contours when extracted from DEM in QGIS?

I used QGIS Raster->Extraction->Contour tool to extract contours at 1m interval from a virtual raster. The virtual raster was built using around 100 tiles in ASC format that represented a 1m DEM. ...
13
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3answers
10k views

Convert raster to smooth contour polygons in QGIS

I have had limited success creating smooth contour polygons from a raster layers. I have created contour lines and boundary polylines and then used QGIS Union. Then I use QGIS Polygonize. Then ...
1
vote
1answer
67 views

Creating raster that contains gradients given contour shapefile using R?

Using R I'd like to create a raster from a set of contour shape files, where each cell in the raster contains a value for the derived gradient. I am using OS Terrain 50 contour lines which is open ...
1
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2answers
204 views

QGIS 3.x contour creation tutorial

I'm trying to follow this tutorial so I have a method for creating contours in QGIS because I find the contours generated by the contour plugin a bit strange (very sharp edges and whatnot). I can't ...
1
vote
1answer
68 views

Plotting a heat map onto background in python using kde?

I have a geodataframe with points within the united states. Each point has a geometry attribute as well as a value. I would like to plot a heat map based on these values on top the map of the united ...
6
votes
1answer
358 views

Trying to Create Tanaka Contours in QGIS

I am following a tutorial with which to create Tanaka contours from: Tanaka Contours. I used contour with the default 10 increments setting. Below are the raster and resulting contours. Following ...
1
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0answers
21 views

Log Scale Contouring in ArcMap?

I have a shapefile of concentration values, they range from 0 7000. I want to either contour or display these in log scale (0.1, 1, 10, 100 and 1000) what is the best way of doing this? I have about ...
3
votes
1answer
376 views

Extracting xyz data from .dxf after conversion to shapefile in QGIS

I have both a .dwg and derived .dxf data set originally generated in AutoCAD Civil 3D. It appears as a series of triangles which cannot be exploded but each individual triangle does have xyz ...
3
votes
0answers
55 views

Removing noise selectively from DEM using QGIS?

I am looking for a processing tool that can remove noise selectively from a DEM (Mostly SRTM). My current workflow includes "Fill sinks" and "r.neighbours". The problem is that the tool is blind to ...
1
vote
1answer
119 views

How to automatically get/assign contour height attributes?

I have quite a simple problem yet I can already guess the solution is going to be pretty complicated. I'm using QGIS and was wondering if there is a simple way for the computer to automatically assign ...
1
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0answers
23 views

Contour Polygons to 3D

I am trying to make a 3D representation of the map below. I have 3 polygons which represent contour lines. It starts at 0ft for the outside polygon, 10ft in the middle and 20ft for the very center ...
7
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1answer
1k views

Creating polygon elevation contours?

I'd like to create polygon shapefiles to communicate elevation information on regional maps. I find these draped over a hill shade layer provide one of the best base maps. I can tell some ...
1
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2answers
3k views

Clipping lines vector layer to polygon layer in QGIS?

I have a lines layer (a contour map of mean annual precipitation in Africa) that I want to clip to a polygon layer (shape of the African continent). However every time I use the clip tool (Vector-->...
0
votes
1answer
100 views

KML polygon rainbow filled colors is showing only as simple color?

I draw filled color contour in Surfer application I imported this file to Google Earth as .kml file There is no problem so far I tried to import the same file to QGIS 2.18.28 But the colors is not ...
0
votes
1answer
480 views

Showing contour line elevation labels in QGIS? [closed]

I have a contour map in DXF imported to QGIS. How do I turn on the elevation labels for each contour so they are visible. I thought I had done it by clicking on the layer and selecting properties > ...
3
votes
1answer
387 views

SVY and QDC files from Quickdraw Contours in QGIS

I am trying to view data collected from a Garmin sonar unit in QGIS. The data on the Fishfinder shows or creates the contours but I can't seem to find a way to convert it to a format that QGIS can "...
4
votes
3answers
2k views

Exporting contour lines from CAD to GIS

I've been using GIS softwares in the past few years by I'm new using AutoCAD. Well, I have contour lines in AutoCAD and I want to export it into QGIS (I also have access to ArcMAP). I saved as .dxf ...
1
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2answers
53 views

Split long lines in PostGIS

I would like to render contours using Mapnik. The problem is that some contours are very long which makes rendering too slow and so I decided to spling long contours to multiple smaller segments. ...
34
votes
2answers
40k views

Creating DEM from contours in QGIS?

I have a shapefile with contours and their heights. Is it possible to make a DEM from contours in QGIS without using GRASS? I found Creating DEM from contours using ArcGIS Desktop? but the answer ...
11
votes
2answers
46k views

Creating DEM from contours using ArcGIS Desktop?

I have a large set of contours that I received broken down into several different subsets. I have merged most of the subsets together creating a larger set of contours in three different files. I have ...
0
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0answers
36 views

Creating DEM from contour pyQGIS? [duplicate]

How can I create Digital Elevation Model using python codes in QGIS software?
1
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2answers
62 views

Creating contour file from DEM?

Using a 3-meter DEM, can I create an accurate 5 feet interval contour file? Or is the minimum interval contour I can get is 10 feet (roughly 3 meters)?
1
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2answers
24 views

How to use gdal_contour to APPEND data?

I'm trying to import contours from SRTM HGT files. First try (nice): gdal_contour -f PostgreSQL -a elevation -i 10 srtm/S01W069.hgt "PG:host=volcano-db user=postgres password=guesswhat dbname=...
3
votes
2answers
63 views

Creating contours based on polyline using ArcMap?

I would like to create a simple floodplain map. I have LiDAR data with 1 meter accuracy. I have clipped it to a small area of interest that my computer can handle processing the LiDAR. I want to ...
2
votes
1answer
65 views

Labelling contours within polygon using QGIS?

I have two layers, one which contains a polygon, and one which contains contours. Unfortunately, they have different projections. I want to label the contours with their elevations BUT I only want ...
0
votes
0answers
14 views

Force higher zoom level on MBTIles

I have a vector tileset of contours in MBTiles format. At the moment on the application that I am using them on I have to zoom really far in before I get detailed contour lines. I would love to have ...
1
vote
0answers
109 views

I get “The following layers were not correctly generated.” error (Raster -> Extraction -> Contour) QGIS

No matter what parameters I enter for the contouring, I always get the response in the log of "The following layers were not correctly generated." I'm working QGIS 3.6. I am not familiar with this ...
2
votes
1answer
567 views

QGIS contour plugin exception struck? [closed]

I am trying to make a depth map of one of the lakes that I manage. I recorded my data using a lowrance depth finder. I have imported the data into QGIS and now have all the points that were recorded ...
1
vote
1answer
50 views

Showing Outline of Island on Topographical Contour Map using QGIS?

I am fairly new to GIS. I have been reading through this site and have not quite been able to figure out what I am doing wrong. I am trying to create a contoured topographical map that I can cut ...
0
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0answers
11 views

Combining a vector layer with a Raster layer Geotiff orthomosaic and contour/Shp file

I am attempting to do the same as @shub but when I do the above process "Bring in a shapefile of your contours and make sure they have an elevation attribute with them. Go to Raster > Conversion > ...
0
votes
1answer
64 views

Looking for working contour Layer as a WMS or WFS

I have had good success in the past with the following Contour layers but as of late neither seem to work: https://carto.nationalmap.gov/arcgis/services/contours/MapServer/WMSServer? https://...
1
vote
1answer
228 views

Loading contour plugin of QGIS?

I have installed the contour plugin on my kubuntu 13 laptop, but when I am opening qgis (2.0.1) I get the following message: Couldn't load plugin contour due an error when calling its classFactory() ...
2
votes
1answer
68 views

Select Contour by Length

I am a real beginner with QGIS 2.8. I am able to generate a contour map from a raster DEM, but the contour map is very 'busy' because the land form is pretty flat. There are lots of short contour ...
2
votes
1answer
91 views

Grid net contour/outline QGIS [closed]

How to make a contour/outline of grid net polygon? Just need a thick boundary of the grid net to make the result more "beautiful". I tried to do it somehow in symbology, but unsuccessfully.
2
votes
1answer
87 views

Mirrored Contours from DEM in QGIS

I am trying to create contours from a DEM in QGIS 3.4. I used the GDAL raster extraction contour tool. The contours are drawn correctly, but they are mirrored along the north line of the DEM (see ...
0
votes
0answers
29 views

Contour Lines to Solid Polygon >= 21 Feet

I am running a hypothetical earthquake/ tsunami scenario off of Western Sumatra. Parameters are to display a 45 ft. tsunami inundation zone off of the Mentawai Islands (purple contours in images below)...
3
votes
1answer
691 views

Finding “negative contours” when making contour lines from DEM

I have a large 2m DEM which consists mostly of mountains. But here and there there are depressions in the terrain which I need to find, or even better, automatically find in contour lines I'm planning ...
2
votes
2answers
181 views

How to use a .kml file to create a 3D mesh from contours?

I have downloaded a .kml file from this source: http://www.carpworld.co.za/index.php/dam-contours/boskop-dam. This is how it looks in Google Earth: This file contains contours of Boskopdam (a local ...
3
votes
1answer
257 views

Interpolate a Smooth Contour From Points

I have points scattered around some origin point, each with a score. The score should be zero at the origin (similar to distance). I want to generate smooth contour lines from these points. The red ...
1
vote
1answer
72 views

Detailed contour map

I'm trying to get a map of contours that are detailed to a street level that I can then import into Rhino to get an accurate landscape map of an architectural site. Does anybody know how I can get ...
1
vote
1answer
46 views

Splitting raster apart?

This is a WMS layer i'm working with: It shows a list of various line data, 402-914. As you can see to the right, this corresponds with various info on a topographic map. My problem is that all I ...
1
vote
1answer
127 views

Cant find contour lines raster extraction

I am trying to create contour plot concentration data to a map. I followded this link and have interpolated the data as follows: but, while forming contour lines, I am not finding the raster> ...
-2
votes
1answer
37 views

Seeking contour (topo) lines for United States?

I can find five foot contours for most areas, where can I find 1 foot or 2 foot contour lines? Prefer ArcGIS or AutoCAD but will take anything I can get.
4
votes
0answers
336 views

Adding intermediate contour values automatically in QGIS?

We have 100's of elevation contour shapefiles. In each file, only the 10th contour line has values (200, 450, 700, etc..). We have to attribute values for all the intermediate contour lines (2nd line ...
1
vote
1answer
84 views

File not found error using Contour in QGIS 3.4

CSV file load failure in "Contour" procedure, even though the same file will load and display from Layers>Add Layer>. This has not previously been true. The problem could be related to the use of ...
0
votes
0answers
41 views

Erroneous contour polygons in QGIS 3

I have a global DEM and try to calculate contour polygons for 4 different heights in QGIS. In the first image below, you can see the colored DEM (white = lowest; yellow = higher; orange = highest) as ...
0
votes
2answers
113 views

Getting bathymetric contours confined only within river banks using QGIS?

I have bathymetric survey data in the form of XYZ. X and Y are coordinates while Z is river bed level (elevation) from a datum. These are about 14000 irregularly located points within a river. Now I ...
3
votes
1answer
3k views

Creating DEM from vector contours using GRASS and R?

I want to convert vector contours to a DEM. From other posts, I wanted to use the Grass r.surf.contours tool. Initially, I converted the vector contour layer to a rasterized contours using the ...