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

learn more… | top users | synonyms

0
votes
1answer
51 views

Exporting linework layer with 'altitude' attribute in QGIS to DXF with lines raised in z according to altitude attribute?

I have contours which I have brought into QGIS from a GEOjson - the lines have an attribute of 'altitude'. I want to export these contour lines as a DXF with the lines raised in the zplane according ...
0
votes
1answer
50 views

Contours with negative values using the model example in QGIS?

I have a data set of water level ranging from -6 m below sea level to +30 meters. But when I use the model example for creating contours from points, the minimum contour value is zero (0). What can be ...
0
votes
1answer
279 views

Error with the Contour (Spatial Analyst) tool in ArcGIS

I am having an issue with the Contour (Spatial Analyst) tool in ArcGIS. When I manually run the tool in ArcToolbox, it will sometimes say that the tool has failed, giving the following error message: ...
0
votes
1answer
206 views

How to convert excel csv file to filled contour Google Earth Map?

I have a csv file http://www.geocities.ws/radar/data2.csv. The first column is latitude. The second column is lonitude. The third column is precipitation type. 5 represents freezing rain. 15 ...
0
votes
1answer
160 views

How to colour contour lines in .shp file when the lines are not meeting in QGIS?

I am doing bathymetry analysis, where I would like to color the contours one by one in the case land is rising (or sea level going down). There is a comprehensive explanation about coloring contours ...
0
votes
2answers
122 views

Output map of only 50m-100m contours [closed]

I´ve got the "OS Terrain 50" contours/spot-heights dataset. I would like to output a series of maps with everything above 0m, 50m, 100m etc. from a region. I know almost nothing about GIS, but have a ...
0
votes
2answers
972 views

How to capture contour lines from OSM cycle map as vector?

In QGIS, there is a plugin to insert a OSM cycle map layer, that brings as an image from http. But I can't convert this OSM Plugin layer to a raster image. I can't even imagine how to get the contour ...
0
votes
1answer
43 views

file type needed to add layer containing contour lines

What file format is usable/recognized by qgis to add contour lines to a map? I'm working with Linux Mint 15, and qgis 1.7.5
0
votes
1answer
62 views

Using Contour plugin, progress bar sticks at zero

I am using Quantum GIS 1.8.0. I have a base map sourced from OSGB Opendata VectorMap District (vector format), and that displays fine. I also have created a spreadsheet showing journey times to a ...
0
votes
1answer
823 views

Label Features with Arcpy

I had run the contour tool in my script to generate polylines. Contour("rectExtract", "C:/fakepath/Class1.shp", 50,0) Now I want to label the polylines with the contour-value. If I execute this ...
0
votes
1answer
1k views

How to generate smooth contours from cropped raster?

I’m trying to create contours from a raster layer in QGIS. On my first attempt, I cropped my raster layer in Photoshop and reimported it, but it lost coordinate data I think. I made the contours ...
0
votes
0answers
27 views

Command Grass in QGIS not work

When I use r.contour or other Grass commands in QGis, I have this error message. Why?
0
votes
0answers
41 views

Extracted Contours from DEM translated in QGIS for certain intervals

I created a DEM from several point files in QGIS. Both of these line up well with the remaining data in my file (ie cadaster, aerial imagery, etc). I wanted to generate 2m contours from the DEM ...
0
votes
0answers
74 views

Merging contour lines generated by gridded data

I have a set of gridded data, which I have used to generate contour lines based on separate values in the data. In the example provided the contour lines shown correlation coefficients. The contours ...
0
votes
1answer
33 views

Contouring surface with barriers?

I'm using ArcGIS Desktop 9.3, and I want to contour a surface with barriers. Every time the result is a polyline contour shape file which covers only a part of the surface not the whole surface. ...
0
votes
1answer
104 views

gdal_contour transparent contour as png

I started using the GDAL Library in a c++ project. It is a great library, but I am a bit stuck right now with different aspects of it. What is the best way to use gdal_contour in my c++ programm? ...
0
votes
0answers
45 views

ContourList error

i use ArcGIS Desktop 10.1 in Windows 7 and develop with visual studio 2010, .net v3.5. This is a quite strange problem. I have a Console Application that calls this simple function: public void ...
0
votes
0answers
383 views

Contour tool in ArcGIS 10.1 giving syntax errors [duplicate]

I am trying to run the contour tool on a raster in 10.1 and get the following error messages? Does anyone know if this is a bug and is there a work around? ERROR 010328: Syntax error at or near ...
0
votes
0answers
152 views

Google Maps basemap not showing up when KML file added as a vector layer in QGIS - only point markers appear

I am trying to make a basic XYZ contour plot in QGIS 1.8.0 (longitude, latitude, depth in an excel file) and can't get past the first step of adding a basemap in QGIS. I've tried using the Open ...
0
votes
0answers
427 views

How to create contours from points where points are not a grid?

With QGIS 2.01, the plugin Contour is not available. Anyone have another method to create contours from point / shapefile source, where the points are not a grid?
0
votes
1answer
418 views

Continents geometry data / extracting contours of continents from country geometry

I have an ESRI Shapefile data from Natural Earth (Admin-0 Countries). I converted it to geoJSON format. There is no world or continents geometry there, only the county one. And I'd like to extract eg. ...
0
votes
1answer
60 views

Editing symbology of contourlines with Arcpy

I just have a problem with my pythonscript. I had run the Contour-tool to generate polylines. Contour("rectExtract", "C:/fakepath/Class10.shp", 20,0) Now i want to mark the 100 meter lines in ...
0
votes
0answers
148 views

QGIS 1.8.0-Lisboa error message when converting DEM to Contours

I am trying to convert a small DEM (1 megabyte) into contours. When I go to - Extraction - Contour- and run it I get the following message: "ERROR 1: CPLRealloc(): Out of memory allocating 416 ...
0
votes
1answer
540 views

Most optimal algorithm for contour correctness?

Am creating an app which correctly calculates contours from a DEM file or any height-map given to it. The correctness of the contour holding the most importance, since a person viewing the contours ...
-1
votes
1answer
138 views

Create a DEM with 1 foot contours

I have Lidar data which contains multiple .las files for an entire quad. I have figured out which .las is the area I am looking for. I was told the data is in 1.4 meter resolution and would work to ...