I'm trying to create an Aspect Map similar to this one:    I have two files to work with from the start; the primary is a contour .dwg that I know is accurate while the secondary is a DEM that was created in Civil 3D using those contour lines (Civil made a huge file out of it so I'm not a big fan of using it if I can start from scratch using the contours in QGIS).    In my first attempt I used the DEM and the Aspect tool within DEM (Terrain Models) to create a map.  It worked, but for some reason it looks like it's converting the DEM back to contours and coloring the contours rather than the entire surface (as if it interprets the slope between the contours to be flat).  This is a screen capture of what that's looking like:    It works in the steep areas, but the flatter areas don't really cut it.  This is a screen cap of the DEM I used to make this:    I presume that the problem is that the DEM was generated as flat tiers between the topo lines.  So it looks pretty good as a greyscale but when QGIS tries to interpret the slopes it's reading each grey as a flat plane instead of smoothing the colors across the surface.  Does this make sense?  If this is a problem, I guess the next question is: can I use contours to create a DEM that will work better for this application?
25164
I have a shapefile with contours and their heights.   Is it possible to make a DEM from contours in QGIS without using GRASS?   I found  but the answer is for ArcGIS Desktop.
69436
I have a .tiff data file that generates contours in QGIS. I save it as .dxf. The contours don't have any attributes or data. That's bad, because I want to make a 3D landscape in Revit using the information.   How do a save/export the contour lines from QGIS so that they have a z-elevation attribute or at least some information?    I ticked the attributes box when extracting the contours, but the attributes doesn't show in the dxf.
122551
I have a list of surveyor points, and I will need to create a DEM model out of it ( in geotiff format if possible for space consideration, if not, then in ASCII grid format).  I need the DEM for watershed and catchment delineation purpose.   Instead of using existing software like ArcGIS, I want to write my code to do it ( in C++ or C#), so that I can later integrate them into my own GIS software. is there anything in GDAL or other open source tools that do this well? Or do I have to write from scratch?
80064
I use QGIS 2.18.5 and I get in stuck with two polygons I cannot solve.  I want to make a new polygon from these two which looks like this:  I made thew new one: Cut 1 polygon and paste to other layer. Used polygon to lines toolbox then explode lines, then deleted the lines which do not needed then used the add feature to connect lines. Last I dissolve new lines then convert lines to polygons. The new polygon looks like that I wanted to get in QGIS but when I use wayline converter which convert polygons to my tractor GPS it is only shows one polygon:  What could be the problem?  Look I deleted the line I do not need.  When I select Vertex Tool it appears the line I deleted earlier.  I think this is the main problem but I do not know how to remote it well..   I found it but is is not the result I wanted to get. :D Look I want to this from 2 Polygons: I want that new polygons that is circled with red:  After used the Minimum Bounding as Minimum Oriented Rectangle I got this:
118693
I'm trying to create 5 maps in composer showing the same layer features but different extents of a map (attached an image to give everyone an example). I've opted to use atlas to save me manually creating 5 maps... but I have hit a barrier.   I think where I am going wrong is that I am trying to create an atlas based off a point layer (which is my coverage layer) so it is creating individual maps (about 60 +) for the points displayed.   However... I would like atlas to generate 5 maps for the different geographical extents that cover those points?   I right in thinking that I'll have to go and create a polygon shapefile that creates say a bounding box around 5 different areas to contain the points of interest? &amp; then select this as my coverage layer when generating an atlas?  Does anyone know a way to achieve what I am trying to do? Any views or general help would be great.
74450
I have an area which is divided into several zones the borders of which I have defined as separate layers.  The layers are defined by sql queries on a postgis table of line segments joined with a table that says which segments are part of which zone boundaries.  What I want to do is produce a set of maps where each map is a zoom to layer extent for each zone and which has standard header, legend and scale (which will preferably vary with the zone but could be fixed across all maps).  My first attempt was to get a new composer for each map -- that worked but was rather tedious.  Next I tried producing one map and printing it and then deleting the map frame and going into qgis to zoom to the next layer extent and make the boundary visible then hopping back into the composer to load it in.  This worked more or less.  Map was fine, legend was OK because it was the same for all the maps and the zone name was easy to edit but the scale needed to be deleted and set up again for each map.  Next I looked at Atlas Generation.  The manual seems to assume that you know how it works and all you need is a reminder about the details (like so many software manuals ;)  It seems to assume that you have something that you are iterating over but I can't see how to make it work -- there is nothing to iterate over to get the layers.  Any suggestions welcome!!  :)  Russell
19871
I have a terrain with two materials going into a Mix Shader, I want the fac input to be the slope of the terrain. Steep parts should be one color, flat part another.
22957
How can I create a 3D shapefile containing line features or point features? I have to extract the elevations from a DEM and then export a shapefile containing 3D features. I'm currently working with QGIS 2.8.4
11050
i want to create 4-5 detailed maps, and then an overview map that has rectangles that markes the locations of the detailed maps. Best case would be if the rectangles were links to the detailed map.   I have managed to make the overview and the rectangles, and think I know how to make the detailed maps one by one. The rectangles are drawn manually on the overview map. All layers that I plan on using are in the same QGIS project.  The final product that I hope to create would be the overview map on the first page, followed by the detailed maps. The overview would have links to the detailed maps, click on the rectangles to open the right detailed map.  Is there a way to link the detailed maps to the overview in QGIS 2.8 print composer?  I'm still not sure if I'm doing something wrong, when I try to create the overview. I want it to show the extents of all of my detailed maps.   Is this possible?
66667
I'm pretty new in QGIS and i'm searching a drawing tool like it is possible to find in microsoft word or excel.  I search something very user friendly (for dummies!) to add circles, arrows, lines... with no need to create a new layer!!  Can you help me?
100465
I need help creating such a graphic in illustrator or photoshop using simple tools and maintaining the perspective effect in sharp folds (contrary to wrap tools)  I tried mesh tool but couldn't figure out a way to have the slanted effect.    any ideas?
61809
Does anyone have a simple work-flow for drawing cross sections of earth features in QGIS?   My thing is that QGIS is being used to present the plan view, but we have a little interest in some elevations as well. All the data is one set and is simply an elevation value in the attribute table, I don't want to have to move all that to CAD.  One logical workaround is to present the z value as the y.  I am a dunce in paper space in CAD, and would be more comfortable with the QGIS Composer.
29455
I want to convert vector contours to a DEM. From other posts, I wanted to use the Grass r.surf.contours tool.  Initially, I converted the vector contour layer to a rasterized contours using the rasterize (vector to raster) tool. The contours rasterized well but there was 0 values between them.  I have tried the Grass plugin but it isn't giving me good results.  I suspect it is because of the 0 values.   How do I strip these out?
30797
Trying to do some golf course layouts in 2.73a. Would like to use topo elevation info. Currently have grayscale .jpg of site - top view. How do I get this into Blender as a "lumpy" plane?
119868
I've been working on a mesh and realised that part of it is not being shaded consistently across the borders of each quad. I've isolated the section into its own blend file and cannot figure out what's causing the issue.  The section in question is a flat plane with some loop cuts. It's set to flat shading and the face normals are all consistent and pointing in the same direction. There is no modifiers applied.    Does anyone know the cause of this and how to correct it?  Blend file can be downloaded here:
2875
In a raster layer's Style Properties, I can choose pseudocolor render type, and choose a color ramp and classify the raster.      However, when I click the 'Apply' button, or click 'OK', the visualization of the raster never changes.  I was able to output a 'colorized' version of the same raster using GRASS plugin.  I also reinstalled QGIS 2.8, and was able to adjust and see a raster stylings using the steps I outlined above.  So, can anyone confirm this as an issue, or confirm that there's a mistake somewhere in my process?  I should note that I'm on a Mac, 10.10.4, and I'm using the QGIS provided by , 2.10.1-1 .  Update 1: Here's a screenshot of the rest of my settings.      I have Grayscale set to off in the Style setting.  Also, I don't believe grayscale/color-blind Preview is available on the Mac version of QGIS.  They're does't appear to be the option where it , in the Menu Bar under View / Preview / Photocopy (grayscale) etc.  Either way-- I added a shapefile to show color.  Update 2: I've experimented with setting color interpolation to discrete, linear, and exact, but still am not able stylize using Singleband pseudocolor.  I've also confirmed that the 'Render' box on the the main map view is checked.  Also, I am able to adjust Color Rendering settings, like Hue, Blending Mode, etc., and see the results when clicking 'Apply' or 'OK'.  Update 3: As other Mac users are confirming this, I think it may be a bug. I've created a bug report at the official .
100403
I'm attempting to make an elevation profile from a DEM in ArcMap using the Interpolate Line tool.  I've done this before, and it has worked great--basically I just draw a line with Interpolate Line, then click Profile Graph to get the elevation profile.  However, for some reason, it's not working now: when I draw out my line, nothing shows up on the map.  I don't get a line, and I can't figure out what I'm doing wrong.  I've searched online for an answer, but to no avail.    Any tips?