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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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25 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
30 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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29 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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27 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
43 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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46 views

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

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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36 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
53 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
34 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
179 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
29 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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19 views

Contour using spreadsheet data

I have a spreadsheet with well points that have subsea data that is negative number, or below sea level. I attempted to use the "Contour Plugin" on QGIS but I get errors saying it needs a float rather ...
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37 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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16 views

MultiLineString with elevation data exports 2D shapefile in QGIS?

I imported lyr data to QGIS. I see the countours nicely. The attribute table shows elevation data. When I save the layer to a shapefile, geometry type in linestring, and open it in a shapefile viewer,...
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1answer
37 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
88 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
82 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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23 views

From DEM resolution/precision what limit to contour lines altimetric range?

I got a 1m resolution DEM: what is the altimetric range limit of contour lines I can create from it? Not only the resolution needs to be taken into account but precision as well. For now, I did not ...
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33 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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52 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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39 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
70 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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47 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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461 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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42 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
55 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
108 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
42 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
66 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
65 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 ...
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1answer
45 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
76 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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112 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
29 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
60 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 ...
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1answer
182 views

How to show Ocean Contours on Mapbox Style?

My users would like to be able to see the ocean contour lines as they zoom in. But mapbox outdoors style only seems to provide contours for land. I'm not a GIS pro but a web dev, so please keep that ...
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1answer
170 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 ...
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0answers
18 views

Extracting lateral averages using ArcGIS Desktop?

I want to do the following: to calculate the lateral average value of the surface aspect of a glacier (i.e. the average along a specific contour, the greenish lines). Can someone help me or say how ...
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0answers
272 views

QGIS Contour Extraction Malformed Path (QGIS 3.0.1 Girona)

I'm attempting to create contours from a raster DEM (provided by USGS). I open the dialog at Raster > Extraction > Contour, choose the input level, leave the default Band number of Band 1, set an ...
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1answer
717 views

Producing smooth and consistent contour lines from SRTM

I downloaded and merged together a set of SRTM imagery. I am not sure whether it is my workflow, the actual terrain in question or if the scale of the imagery is simply too large to obtain smooth ...
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1answer
85 views

Adding contour values to Contour List tool of ArcMap?

I use ArcMap and I have a bathymetry raster (ESRI ASCII). I want to produce certain contours with the contour list tool I put the negative values of contours (depths) but I get error 000859: The ...
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1answer
66 views

Interpolate Coarse Raster Contours

I have a raster elevation map that has two tiers of known elevation, and I am trying to produce a raster that will smoothly contour the area between the two tiers with a gradient corresponding to the ...
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0answers
74 views

Rice Field Levee Contours - .2 foot interval needed - LiDAR data? [closed]

I am a rice farmer in Arkansas and would like to create levees along contour lines in a field at a .2 foot interval. How could I utilize LiDAR data to map 0.2 foot contour intervals across my area of ...
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0answers
83 views

Getting negative contour values in ArcGIS Desktop?

I have a DEM which shows negative lower value. The DEM is with vertical datum reference of WGS84 spheroid. When I generate contours, 90% are in negative values. How do I get the positive value of ...
2
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1answer
94 views

Changing the band for contour lines?

I am making contour lines for a NetCDF file for sea surface temperature and the contour lines display the first band only (bands represents different dates). Theres few 100 bands in the NetCDF, how do ...
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0answers
26 views

Methods to differentiate between terrain

I am not specialized in GIS. I have some moisture contour maps, I want to compare each pair to trace the changes between either in a numeric way. I tried to get the mathematical difference between ...
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0answers
57 views

Lines around spatial points QGIS

I have a layer with spatial points in QGIS. I would like to create contours around a cluster of points with particular attributes. I cant't find a way to create these contours and, then, to create ...
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1answer
382 views

Adding contour line to heatmap in QGIS?

I use QGIS 2.18.14 I import csv file with hits on a certain area. I then create a simple indicative heatmap (properties > heatmap). Can I add contour lines to this heatmap and if yes, how? I also ...
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1answer
99 views

QGIS Contour WAsP .map output file format

I want to create WAsP .map vector file in QGIS from a input ascii file. For this, I tried using Raster->Extraction->Contour and then set the option for 'Output file for Contour lines (vector)...
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70 views

Functionality to digitize and attribute contours (similar to R2V) in QGIS?

A long time a go I used to work with R2V to digitize contours from scanned maps. Is there some plugin or ongoing project, which brings similar functionality of R2V software to QGIS? Specifically: (...