Questions tagged [contour]

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

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2answers
36 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. ...
6
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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 ...
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0answers
21 views

Seeking script to make DEM from countours in PyQGIS? [closed]

Does anyone know how can I make Digital Elevation Model in QGIS using python console or has a ready script for it?
32
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2answers
38k 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
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2answers
45k 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
34 views

Creating DEM from contour pyQGIS? [duplicate]

How can I create Digital Elevation Model using python codes in QGIS software?
3
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2answers
121 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 "...
1
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0answers
32 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. ...
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2answers
51 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)?
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2answers
19 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
50 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
62 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
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0answers
9 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 ...
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0answers
58 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 ...
1
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1answer
105 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 ...
2
votes
1answer
535 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
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1answer
36 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 ...
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0answers
10 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
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1answer
46 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
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1answer
218 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() ...
1
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1answer
82 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 ...
2
votes
1answer
51 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
61 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.
0
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1answer
53 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 ...
2
votes
1answer
68 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
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0answers
28 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
618 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
109 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
135 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
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1answer
67 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
44 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
91 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
30 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
312 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
53 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
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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
82 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 ...
1
vote
1answer
159 views

GDAL doesn't create contours for the whole raster

The contour algorithm in QGIS doesn't create all of the contour lines. I've attached a screenshot of my raster layer below and the parameters I used. The raster ranges from 40-90 in value, spreading ...
1
vote
3answers
1k views

Labelling contour lines in QGIS?

I need to label contour lines in QGIS 2.14. I've tried a few things, including Choosing only one contour line to label in QGIS? but it labels with the IDs instead of altitude. EDIT: I've created the ...
1
vote
1answer
181 views

Creating Contours via SLD using the Barnes Surface interpolation in GeoServer

I am trying to make a map with PostGIS and GeoServer, showing weather data. The data that I have is pointdata from observation stations. The data is vectordata. With an SLD using the Barnes Surface ...
1
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0answers
113 views

GeoServer SLD contours fail to draw some times when panning (using Layer Preview) [closed]

I am using GeoServer 2.13.2 with netcdf data from ECMWF and all is working fairly well with a fixed extent. As soon as I turn on Map Wrapping (wrapx) in OpenLayers (5.x) then contours, wind barbs, and ...
1
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0answers
147 views

Exporting contour labels to DXF

I am very new in QGIS. I imported a DEM in QGIS, I generated contours, then I have added some labels. I have been able to export those contours in DXF but the labels haven't been exported. How can ...
0
votes
1answer
150 views

Custom contour color gradient using RGB values from QGIS

I'm using QGIS 3.4.1, and downloaded the SRTM data for the area of my interest, and added the TIFF format SRTM data file to my project using "add raster layer" option. Here, I wish to change the ...
11
votes
2answers
9k 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
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0answers
38 views

Style lines differently when intersecting a polygon

I want to give my contour lines a blue colour on glaciers (inside the polygon that shows the outlines of the glaciers) - and a brown colour everywhere else. What is the easiest way to achieve this? I ...
6
votes
4answers
7k views

How to install the Python module shapely for QGIS use?

I'm using QGIS 1.8.0 on a Mac with OSX 10.6.8 (Snow Leopard). I've installed QGIS including GDAL, GSL, UNIXImageIO, Freetype, and Matplotlib all from www.kyngchaos.com. When installing the plugin ...
1
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1answer
71 views

QGIS distorted contour from DEM

The contour map that I generate from a Maps Made Easy (MME) DEM produces a distorted result and I’d like to learn how to correct the problem. Shown is a pool that has been physically measured to be ...
12
votes
4answers
8k views

Choosing only one contour line to label in QGIS?

Is it possible to select only one contour line for labelling? I have numerous labels for each line and I'll prefer to label only the main ones, such as 1000 m and 1500 m
1
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0answers
51 views

Create contour lines from a WCS file in QGIS?

I am currently working on a mapping project in QGIS, and the only good DEM model I can find of SE Norway is a high-res WCS link that I have uploaded into my project. I would really like to create ...