Questions tagged [contour]

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

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31 views

Interpolating Contour Lines from Existing one in ArcGIS Desktop?

I have a DNG file (vector) with contour lines but there are places where contour lines have wrong (same) elevation (red contour lines). Is there a tool in ArcGIS Desktop 10.5 to interpolate contour ...
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1answer
48 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 ...
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20 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 ...
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1answer
58 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 ...
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48 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 ...
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21 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 ...
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2answers
52 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. ...
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36 views

Creating DEM from contour pyQGIS? [duplicate]

How can I create Digital Elevation Model using python codes in QGIS software?
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2answers
49 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
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=...
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2answers
59 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 ...
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2answers
59 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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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 ...
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94 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 ...
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1answer
45 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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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 > ...
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1answer
340 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
61 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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2answers
184 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
57 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 ...
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1answer
80 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
80 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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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)...
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1answer
98 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 ...
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2answers
153 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
225 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
89 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
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 ...
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1answer
123 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
35 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
78 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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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 ...
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1answer
188 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
269 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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173 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
103 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
204 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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148 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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40 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
75 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
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 ...
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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 ...
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1answer
63 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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59 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
156 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
451 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
466 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 > ...
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41 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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63 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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90 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-...