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Questions tagged [contour]

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

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5 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 > ...
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1answer
14 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 "...
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1answer
35 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://...
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0answers
19 views

Color area bound by selected area and contour

I am fairly new to QGIS and would like to specify a non-rectangular area within a topo TIFF (I can create a vector polygon) then create a contour(s) of some specified elevation (I know how to do that) ...
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1answer
50 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 ...
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1answer
47 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
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1answer
52 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.
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1answer
47 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 ...
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21 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)...
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1answer
55 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
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2answers
69 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 ...
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1answer
69 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 ...
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1answer
35 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 ...
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1answer
64 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 ...
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1answer
59 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> ...
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1answer
26 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.
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1answer
46 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 ...
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0answers
39 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 ...
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1answer
129 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 ...
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1answer
98 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 ...
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0answers
112 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 ...
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2answers
69 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 ...
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1answer
109 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 ...
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0answers
95 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 ...
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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 ...
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1answer
66 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 ...
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1answer
43 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 ...
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3answers
689 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 ...
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1answer
49 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 ...
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0answers
43 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 ...
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1answer
83 views

Exporting contour lines to x-y-z raster in ArcGIS Desktop?

I am using ArcGIS 10.5 and have a shapefile containing contour lines. I would like to get the height values at equidistant positions. In other words, I would like to interpolate and sample the contour ...
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2answers
234 views

Source of Contour Lines for QGIS

I am planning to go on multiple days hike and used Wikiloc to download GPX tracks. We will use a GPS for our navigation but I always want a printed map as a backup. Maps for that area are notoriously ...
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1answer
268 views

Show contour line elevation labels in QGIS

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 > ...
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0answers
39 views

Speeding up contouring of .mrr files in Mapinfo?

I'm contouring relatively small 30m resolution grids - 50-100mb .mrr files. Creating a simple 1 level contour takes hours! I let a slightly larger one run on a spare machine and it took days. Is ...
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0answers
60 views

Uploading overlapping contours into PostgreSQL?

I've got 100+ shapefiles of contours with the following fields: class (text) altitude (double) geom (geometry) And I need to upload them into a single table in PostgreSQL. Now, I've managed to ...
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0answers
73 views

Line Model with Z-dimension [duplicate]

I made a contour model of a specific area and named it by its height. I need this Data to import into AutoCAD, so I saved it as .dfx with Information about its Z-dimension, by choosing "include z-...
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2answers
93 views

Printing/Exporting maps based on contour lines using ArcGIS Pro?

I have generated a map with layers for contour lines, roads, trails, rivers, lakes, etc. What I would like to do is print to PDF (AI or other) a page/map for each contour level. Ex: one for 1900m with ...
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0answers
89 views

Locate roads that are close to steep slopes which risks landslides

I've a query, I'm trying to locate all the roads which are basically at risk of erosion (landslide?) when it's raining heavily for a municipality. What I have to work with is this: A shape layer ...
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0answers
542 views

Openlayers in QGIS - Errors in opening google satellite/

End goal: To put contour lines with lat&long layers from a google earth location (Rock Piles beach, HI) in QGIS. I plan to use CRS: EPSG:3760 Does the Plug in (Openlayers / QuickMapServices) ...
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0answers
54 views

' failed to create directory' error message when using Raster>Extraction>Contour

I'm using QGIS3, attempting to exctract contours from a DEM. I have the following message 2018-07-05T14:28:35 INFO GDAL execution console output ERROR 1: Failed to create ...
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1answer
88 views

Contour Plugin Processing Algorithm is not detected in PyQGIS 3 Standalone

I was trying to access processing algorithm using PyQGIS 3 on a standalone script. I found this solution and tried it but when I list the processing algorithm using print(QgsApplication....
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1answer
242 views

How to use Contour_To_GeoJson?

I'm trying to convert a matplotlib contourf to geojson, but i'm stuck. I created contourf from a csv. Here's my code : data = np.genfromtxt('centroid.csv', delimiter=',') x = data[..., 0] y = data[.....
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0answers
48 views

Shaded Relief Map to Contours [closed]

Is there a way to create contour map from a given shaded relief map?
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1answer
92 views

Elevation contours from .JP2 / .J2W files?

Is there a way in ArcGIS, Global Mapper, or CAD to generate elevation contours or any sort of surface data from a .JP2 file? I've never been provided this format before and our client is telling us ...
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1answer
91 views

How to install contour plugin for QGIS Wien on Linux mint?

When trying to install install contour plugin for QGIS Wien on Linux mint I get error "The contour plugin is disabled as it requires python modules numpy, matplotlib, and shapely which are not all ...
2
votes
1answer
50 views

QGIS spatial query - points within certian elevation contour intervals

I'm struggling to find a way to identify all the points within certain contour intervals. I have a raster dataset that I generated a contour map from. Within the region of interest, I have a specific ...
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1answer
183 views

Exporting Contours to DWG with Elevation Data

I do not have the 3D Analyst extension. I called one of my old professors and he told me to use features to 3D tool and then convert it to a point file. I need to export the contours to a CAD file ...
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0answers
209 views

Removing contour artifacts from low slope regions

I am generating contour lines from a DEM using QGIS and the python console. The process generates many small circles in regions of low slope (little black circles) that detract from the long connected ...
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1answer
30 views

The shapefiles of two different contours overlap with each other

I tried to create two contour lines with a relatively small difference (0.5meter) on a DEM dataset. For example, I created an 8-meter contour(the red one) and then created an 8.5-meter(the blue one) ...
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0answers
80 views

QGIS/GDALDEM SLOPE Output Has Contoured Or Terraced Texture

I have been trying to greatly reduce or eliminate the contour-like texture that appears in my output from gdaldem slope. The image, below, demonstrates this textural effect. The texture of the ...