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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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12 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 ...
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27 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 ...
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11 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(...
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200 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 >...
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39 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 ...
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27 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 ...
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15 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. ...
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1answer
56 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 ...
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33 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 ...
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3answers
40 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 ...
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9 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 ...
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1answer
95 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 ...
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22 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 ...
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2answers
148 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 (...
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1answer
75 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
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1answer
67 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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1answer
60 views

Easy way to close open clipped contours with the edges of the clipping mask?

I am trying to programmatically (with pyqgis) clip contour lines that I've generated in QGIS, but make it so that the clipping mask forms the new edges of the contours, rather than leaving the ...
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1answer
63 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 ...
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1answer
358 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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22 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
158 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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82 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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27 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
78 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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42 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
60 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
37 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
84 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
90 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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19 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
165 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
71 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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18 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 > ...
3
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1answer
538 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
81 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
318 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
100 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
115 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
117 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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32 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
173 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 ...
3
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2answers
310 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
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1answer
342 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
143 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
80 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
147 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
41 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
107 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
43 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
237 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 ...