I am a beginner to QGIS. My problem is I tried to create sub-catchment within a basin by using provided point datasets (river gauge location). In total, I have 12 measuring points (i.e 12 pairs of x and y coordinates) within my basin. I want to delineate all catchments within basin on the basis of provided coordinates ( not on the basis of minimum or maximum cell that r.watershed has.) I am looking for the function in 'hydrology' extension tool of ArcMap.
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I am using qgis 2.14.17 with ubuntu16. Having as input data a DEM of the region and a river network. In the manual of qgis they suggest to use a toll of qgis: Catchment area (Parallel); I dont have this in my toolbox, anybody made the same experience and could tell me the reason for it and how to get it. It seems to offer the best solution for me.  Tools which are available are from GRASS7 and TauDEM, the latter need much more data it seems. And I am not sure if I am able to create these just out of a DEM? The GRASS7 has one tool r.water.outlet: but here one has to put the outlet coordinates, which clearly I could get out of the river network, but the idea is that they are generated by delineating the watersheds.  Somebody has an idea how to solve it?  I managed now to get SAGA run in the toolbox, nevertheless would be great if somebody could help me with the qgis tool, since it should appear?!
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In ArcGIS, there is a tool called "." Say you have a bunch of points. Some points fall in polygons of interest, some don't. Each polygon has a unique ID. This tool will add a field to the points and assign the unique ID of the polygon that contains it. Is there a tool that does this in QGIS?   question does not ask the same question I am.
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I need to group 400 points in 10 groups with 40 points each. The goal is to get the 40 points geographicly together like this:        Any idea how to do this with QGIS?
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I've a set of regions within a city. I'd like to split each region into five subregions and then get the centroid of each one of them.  I know how to make a vector grid, but the problem I have is that the generated points are not taking into account the regions, they're only related to the general map.  I have this:    And I want to split each region in five equal size areas. Something like this:    I'd like to build a visualization similar to this one: . In order to accomplish that, I need to split each region, because the original ones are pretty big.
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I'm trying to create a label on a map in QGIS.  I can open the setting where there are an X and Y button and a few other properties, like opacity and distance.  I'm pretty sure the problem is that I need to enter the proper X and Y coordinate here, but I don't know how to get to where it lets you enter the coordinates.
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I have a bunch of points on a QGIS map. Each point is a unique sampling event. However, some of these points have been sampled multiple times but there is no common identifier in the attribute data to determine this. The only way we can see this is by looking at the map and seeing points very close to each other.   I am wondering if anyone has a method to assign points within a 150 meters of each other a common identifier?
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I need to find the distance between points in separate layers along a stream network. I have source sites for macro-invertebrates and sites where they are lacking. I need to find the distance between the source sites and the sites where they are not through the stream network.   I tried the linear referencing toolbox but the locate features along route tool can only use one layer of points and has not way to differentiate between sources and not source sites.  Any ideas?  I am using ArcMap 10.3?
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I'm trying to count points within a polygon but it's not working.  I think it has something to do with the co-ordinate system.  The points are from a text file and the line are from a dxf file. I had to set the co-ordinates for both as one was lat long and the other was an old Irish grid co-ordinate system.  When I buffered and dissolve the lines the resulting layer defaulted to the original co-ordinates.  I reset the line file to the correct co-ordinates and ran the query to count points within a polygon. The resulting layer defaulted to its original co-ordinates and all the values were null.
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How do I create a fishnet shapefile using QGIS?   The equivalent task of "Create Fishnet" in ArcGIS.
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I have a polygon layer (where each feature has a class attribute), and a point layer, and there are at least 10 points within each feature of the polygon. Is there a way to randomly select only &quot;k&quot; points of these 10 points for each feature (class) in QGIS?  Thanks!
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I'm using QGIS 2.4.0 and I have a shapefile of points with elevation data and X and Y coordinates. I'm using windows 7 OS.  The idea is to create a contour line SHP using my point data.  My question is: How do I start working on that issue? Is there a function? Is there a step by step process?
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I am using QGIS v3.12 and projection EPSG:27700 - British National Grid.  I am trying to add a label to my map layout which will give the grid reference of the centre of the map as a UK 8 digit grid reference ( e.g. "AB123456" ).  So far I have managed to get the x and y coordinates using the expression:   Grid reference at map centre: [%round(x (map_get (item_variables('Map1'), 'map_extent_center')),0)%] , [%round(y (map_get (item_variables('Map1'), 'map_extent_center')),0)%]   Is there any function available in QGIS that can translate these coordinates into the required format?   Sorry my coding skills are not that great!
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I am trying to get the coordinates of each node of a polygon in QGIS. What I basically did is use the following tools:  Vector -> Geometry tools -> Extract nodes  Vector -> Geometry tools -> Export Geometry column  However only around the first 300 points had successfully obtained coordinate values in the new xcoord and ycoord fields. The other three thousand plus points had null values. What can I do to get the other points' coordinates? Also is there an easy way to get the point order of each node?
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I am trying to create points (new layer) at specific distance along the road (existing layer) in QGIS.   gives solution for ArcGIS. How to achieve this in QGIS?  explains how to create points but does not do anything about the distance.     (I applied the proposed solutions with different measures of lengths for I did not know the conversion) @Nathans's solution worked to some extent, I got...  . Here, the projection of these equidistant points is different from the original line.  With @underdark's suggestion, I got   where the points does not seem to be equidistant. I guess there is some projection issue with both of these which I am not understanding.
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As a land surveyor, I often bring cad data into a GIS and create polygon representing parcels.  Traditional tools I have for cleaning topology are inappropriate so I am looking for something different - even if it means teaming up with someone to build additional extensions.  (I scanned the list of existing extensions and some pieces are already there).  My idea is to fix minor topology errors by constraining key geometric elements. That is, straight polylines and circular arcs which share a common centre point.  A key requirement is support for true circular curves.  I could keep the data in SQL Server but prefer a GUI for a better user experience.  As I am not familiar with QGIS, I am looking for some indication if the data structure used by QGIS can support this.
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How can I load multiple CSV files into QGIS with Longitude/Latitude already included in it. I downloaded the &quot;Load Them All&quot; plug-in, however, the result loaded was converted as text files and cannot be visualize on the map canvass. Any help? Are there any available plug-ins that can load multiple CSV file that will work fine in QGIS?
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I have a raster layer with a Shapefile grid with cells measuring 3 x 3 m overlaid on top. All I want to do is find the pixel with the maximum value within each cell, and place a Shapefile point over that pixel such that each cell has a point. See figure below (excuse the poor job).  I've found Q&amp;As that show how to identify the maximum values, but none that transform the query to a point explicitly. The point is that the points sit above the maximal pixel, not the cell centroid.