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21.260 qgis questions.

I am using the GRASS v.in.dxf tool from the GRASS plugin to import some contours in QGIS. Everything seems fine, but the tool does not import all the contours. There are no additional options in this ...

Is there a way to add a Geopackage into QGIS 2.18.20 that is similar to the approach taken in QGIS 3? The below is a screen grab from QGIS 3.0.3 When I drag and drop into QGIS 2.18.20 it gives me ...

How do I add a comment to a Field in the Layer Properties - Source Fields tab? The documentation says "Comments can be added by clicking in the comment field of the column ...", but clicking in the ...

I'm using QGIS 2.18.17 When I'm editing (e.g. removing objects) from a shapefile in QGIS and click to save the edits, all geometries are lost. All non-deleted objects are still present, but they do ...

(1) I have a layer of points that identify services (Library, Hospital, police, etc.) (2) I have a buffer layer of the area of influence of each service. (3) There are several places where areas of ...

I have a Leaflet web map generated with qgis2web plugin in QGIS. By default, there is one option in the plugin generating window to add an address search bar on the map. Unfortunately, that address ...

We are facing an issue when using QGIS to plan and design FTTx networks. We create the design and it all looks great and print it via composer to be validated on site but when we go back into the ...

The labelling of openstreetmap is hardly readable in QGIS. It has nothing to do with the zoom level. How can I change it to a readable layout?

Could you explain what "buffer" does in the Voronoi dialog i.e. what does the number stand for?

Creating Scratch layer gives me a choice between Polygon and Multipolygon, so I started wondering how should I make use of them. Reading a new book "Mastering QGIS" (through this answer by Joseph to ...

I have a polygon which I want to split with a selected line with a parallel line. I have made the parallel line but it's lenght is not enought to split the polygon. It necessary to be parallel with ...

I have a shapefile in which some of the features have NULL geometries. What I would like to do is to copy existing geometries from other features and paste them to those features within the same layer ...

I wanted to know whether it is possible to change the coordinates of a Polygon by typing them in. I don't want to have to manually drag them into the right position.

QGIS remembers the last saved location for the image that was last created. Is it possible to change a setting so that this last saved location is remembered per QGIS project file?

I am attempting to perform a proximity analysis to determine the distance pixel values on different rasters layers. For example, one layer is roads (with all roads having a value of 1) and one is oil ...

I am working on a project for publishing old scanned maps in jpeg at the scale of 1: 500e and converted into pdf. The goal of the project is to digitize the polygons representing the street small ...

qwat installation in windows

1 answers, 77 views qgis
I'm trying to install qwat but when I get to the step where I have to create th pg_service.conf file I get confused I don't where to put it. Some help would be kind from you

I know there are a few questions similar to this on the forum such as: Is the QGIS cache directory automatically created? and Can QGIS cache a PostGIS layer for faster rendering? but I am still ...

I have multiple sites that are surrounded by a buffer. I also have a layer which corresponds to areas affected by changes. I am trying to filter out buffers that are not overlapped by the change ...

This seems like a counter intuitive question, but is there a way to freeze the legend so that it stops updating itself in the print composer? My auto-update box is unticked for the legend, but the ...

I am trying to use the "Build Virtual Raster" tool in QGIS 3 to build a mosaic. When I run the tool, I get the following message: GDAL command output: /bin/sh: gdalbuildvrt: command not found ...

I am trying to locate a historical distribution/denning point for a species with the data "35km NW of x", with x being a small town. I have created a rough polygon around the current extent of the ...

I have three layouts that are associated with my *.qgs project file. Each layout includes at least one map and a number of text boxes that serve as captions for the map(s). After a few days of ...

I've been able to create a Topo from Canada's CanVec data. But after I 'Export as Image' and save my map to a TIF, I try importing it into Memory Map 6 and it says that it can't import the file ...

In QGIS2.18, I'm changing feature attributes using the following two methods: dataProvider: attrs = { 0 : "hello", 1 : 123 } layer.dataProvider().changeAttributeValues({ fid : attrs }) layer object:...

I have used 2.18 to print maps to file (tiff) using print commposer. The base layer imported into QGIS consists of NOAA raster tiles. (My problem arises whether or not I have added other layers.) ...

I am using Natural Earth coastline polygon (NE_10m_land), loaded from a shapefile in QGIS. All displays well (in, e.g., unprojected WGS84, EPSG 4326) - see below: But when visualising in a polar ...

Invisible polygons

0 answers, 28 views qgis
Question is why some polygons stay invisible on new layers? I need 29 copies of 18 polygons, but 3 of them aren't shown on new layers, however they are shown in the list of attributes. e = 1989 ...

I am trying to compute on QGIS the distance from some clusters (ie points) to their closest road (ie lines); no need for all combinations, just the distance from each cluster to the closest road. To ...

I am trying to create a raster layer in QGIS with a custom crs. When I measure the distance of the equator it is wildly incorrect. The distance should be 38,563.0258 km but comes out anywhere ...

I have created a hotlink in QGIS 3.0, whereby the hotlink is designed to open another piece of GIS information. The link works as I want, expect it opens a new instance of QGIS. How do i get the ...

I made a small model with Processing in QGIS 2.6. The final layer should be the result of a SQL query. Now, in the Execute SQL dialog window I can add the query: select name, max(ele) as ele, geom ...

I have several shapefile vector layers that I need to query so I can group records and export a subset of fields to go into an excel spreadsheet. I thought I could do this by using the graphical ...

I am currently trying to convert the OS Terrain® 50 shapefile into a raster format using the Rasterize function, but the output is just a black square which doesn't seem to have any data attached to ...

I have got a shape file that show this description under Geometry type of the features in this layer: Point (WKB type: "PointZ") I need to use is it in some plugins that seems to work only with ...

If I have a DEM as raster layer and a point with defined position in a point layer, how could I generate a line with defined slope of e.g. -1%? The end point can be anywhere and should be defined by ...

It is quite common for paper topographic maps to label the map graticule with ordinate values in a mixture of superscript and standard digits, eg. ⁴123⁰⁰⁰ to emphasise the significant digits. The ...

I am trying to change the shortcut key cntrl + j (which is standard) to for example q, in the settings I see its changed but in the Attribute table where I want to use it to select a row and then zoom ...

I want to bring to the back (wrap behind) a layer in QGIS and I have no idea how. Anybody knows how? the layers I want to bring to the front if I select every layer, the big one pops over

I have a dataset of over 400 .tif-files, which I'm supposed to merge in QGIS into a single layer, representing a base map. These .tif files are pieces of a topography map (scale of 1 to 50000), and ...

I have created/designed an attribute form window in the Layer Properties - Attribute Form using "Drag and drop"-designer for a polygon shapefile. The number of fields (attributes) will differ for ...

Is there a non manual way to control the colour ramp in symbology based on value. In my example below I have values that can be positive or negative, i want everything positive to be one colour and ...

I have a folder containing 79 tiled Geotiff rasters making up a basemap of the UK. My goal is to efficiently store these in a Geopackage which already contains some vector data also used for base ...

I have an image in projection Pulkovo 1942 / CS63 zone X2. When I try to open it in QGIS, it fails to detect the projection and asks to select the projection manually. Does QGIS handle this family of ...

In short : I'm looking for a Visibility Manager (QGIS 2.18) ou Theme Manager (3.0). I couldn't find it in the QGIS plugin list or in different methods on gis.stack. Maybe I missed it and maybe it ...

I am trying to do kriging on mortality rates using QGIS (I have version 3.0 but I downloaded the 2.18.20 to be able to follow the web documentation and most of the answers here). From what I have ...

I'm developing a basic application out of QGIS and am having trouble getting my code to generate all the layers I have set. Currently it only generates two of the four layers: "self.basemap_layer", ...

In Relating text buffer to text size in QGIS? I displayed various polygon sizes : the objective of my research was to try to adjust automatically the buffer size of the text to the font size because ...

Looking for a solution/built a Spatial Query for specific Location Intelligence database. Problem Statement: Find out hot-spot location for nearby total vehicle stoppages. Database: 1) Stoppages ...

I have shopping mall data with shops and doors. I am trying to run 'join attributes by location' in order to match the shop names with the door. Some doors are located just within the shop polygon ...

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