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Questions tagged [contour]

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

3
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1answer
43 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 ...
0
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1answer
16 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
59 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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0answers
20 views

Libraries to calculate Contour and TIN

Are there any small, free libraries available in Java which I can use to calculate contour lines from GPS positions? I have lat, long and alt information from a GPS for a large area and want to show ...
1
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1answer
49 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
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1answer
24 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
38 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
36 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 ...
1
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1answer
97 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
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1answer
63 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
77 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
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2answers
57 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 ...
0
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1answer
76 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
71 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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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 ...
1
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1answer
56 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 ...
1
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1answer
40 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
383 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
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1answer
40 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
41 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 ...
0
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1answer
60 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 ...
2
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2answers
146 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 ...
0
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1answer
163 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
24 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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0answers
35 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
56 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
59 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
81 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
52 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
511 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
44 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
74 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
169 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
44 views

Shaded Relief Map to Contours [closed]

Is there a way to create contour map from a given shaded relief map?
2
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1answer
80 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 ...
1
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1answer
77 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 ...
0
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1answer
116 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
164 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 ...
0
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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
68 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 ...
0
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1answer
214 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 ...
5
votes
1answer
223 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
19 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 ...
2
votes
0answers
284 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 ...
5
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1answer
1k 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 ...
1
vote
1answer
113 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 ...
3
votes
1answer
77 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
83 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
97 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 ...