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Questions tagged [qgis]

QGIS is a cross-platform GIS application licensed under the GNU General Public License.

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WMTS basemap error in GQIS

I'm trying to load this WMTS basemap into QGIS v3.4 https://citymaps.capetown.gov.za/agsext1/rest/services/Aerial_Photography_Cached/AP_2018_Feb/MapServer/WMTS? The link seems valid because it ...
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0answers
22 views

How to automatically compare two aerial photographs with a GIS with regard to certain features?

At present, we are trying to automatically record the new use of land by buildings by systematically comparing aerial photographs (e.g. 2007 farmland -> 2008 warehouse). For this purpose, high-...
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ArcGIS Mapserver Layer via pyqgis with dynamic layer properties

Is there any possibility to add esri mapserver layers to qgis with dynamic layer properties such as transparency,etc. iface.addRasterLayer("url='https://sampleserver6.arcgisonline.com/arcgis/rest/...
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15 views

Making Qt designer form annotations show up in print composer?

Firstly, I am a QGIS novice, and even less so with QT Designer. I was able to figure out how to use QT Designer to make a QGIS Form Annotation. It sync's well with my data, but I have a problem with ...
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16 views

Google Earth point to polygon [on hold]

I had marked the points in Google Earth. I wanted to create polygon feature by using the point as centroid is there any way I can do that or else need to digitize the polygons?
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0answers
20 views

Processing post-execution script hook to clear scratch layers?

I've been cobbling together some Processing scripts for QGIS 2.18 (I'm not a fan of QGIS 3 scripts), and I keep running into one particular problem: my script creates a lot of scratch layers and they ...
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1answer
33 views

Both layers are in same CRS but in a different place [duplicate]

I'm facing a problem with QGIS and have no clue what I'm doing wrong here. I've tried everything I know of. I have polygon layer in CRS 2180. I add another layer that should be overlapping perfectly -...
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1answer
47 views

Selecting through one-to-many relationship

I'm trying to make a species distribution project where I can select a species from a non-spatial list of species and the selection would highlight (select) all the counties to which the species has ...
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8 views

Print Layout Items. setExtent() and attemptResize()

I'm trying to arrange some map items onto a print layout. Let's start with the map item itself. Here is my code to add a map item to the print layout. Specifically I have questions about the ...
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1answer
32 views

Which datum transformation should I use when projecting from 4326 to 53008 in ArcMap?

I have a polygon shapefile which is on WGS84 and I want to re-project it on EPSG:53008 (World Sinusoidal). When I'm trying to do it either by 'Save as' or by 'Data management tool - Project" it says ...
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1answer
58 views

Displaying (or filtering) features in one layer based on features selected in another

I have points in a layer "Site-Centroids". I generate a lot of isochrones (polygons) around them, into "Isochrone_Site-Centroids". With all the isochrones displayed, the map is too busy. What I ...
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1answer
27 views

QGIS 3 Scale Bar Should Print at 1" But Does Not

In QGIS 3.4, I am using the Print Layout to print some UTM lines with scale bars. My goal is to make a PDF of a map that is at 1:63360 or 1 inch to the mile. When I print the PDF, the mile Scale Bar ...
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0answers
21 views

Exporting All data from Case IH AFS Basic [on hold]

I'm working on some data sets being stored in Case IH's AFS Basic software. I do not have access to the raw files, I need the data stored with AFS in Case's own data formats. I've worked with SMS in ...
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0answers
10 views

v.net.allpairs - Missing parameter value: WHERE condition SQL statement without where keyword

v.net.allpairs is not running in QGIS 2.18.27 (but runs in QGIS 2.14). QGIS 2.18.27 has responded: Missing parameter value: WHERE condition SQL statement without where keyword. How to fix that?
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11 views

Unable to select table in “reclassify by table” algorithm in QGIS Processing Modeler

In the Processing Modeler (Graphical Modeler) for QGIS 3.4.3, the "reclassify by table" tool seems bugged. I cannot select a Reclassification table, even though it's an obligatory field. Am I doing ...
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0answers
27 views

Matching streets in two line datasets with PostGIS or QGIS?

Explanation: I have 2 tables on PostgreSQL, one table named 'city' that have linestrings wich represents streets from a city (using QGIS I downloaded OpenStreetMaps data and imported to PostgreSQL ...
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3answers
31 views

Problem editing, clipping, and saving large shapefile QGIS 3.4

I'm working with a very large shapefile in QGIS 3.4. I only need one section of the layer (near the main city, not the areas outside it) and I'm trying to delete the large sections which I don't need. ...
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0answers
31 views

Using File Projection in QGIS?

I am using QGIS AND struggling with setting projections. I am attempting to reproject all of my files that I am accumulating into NAD83-UTMzone13 utilizing the reprojection tool. The tool appears to ...
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2answers
123 views

How to automaticaly create a buffer for a line in QGIS

I am creating some lines, and I would like to add a 500m buffer around thoses lines. But i need this buffer to automaticaly change if i modify my line around. Is there any solution to this?
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0answers
23 views

I can not access the download URL of boundlessSuite-war.zip [on hold]

I can not access the download URL of boundlessSuite-war.zip. I am already a registrar in Connect. How do I fix this?
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1answer
20 views

How do I change 'Coordinate Display' for a project, programatically?

From the user interface in QGIS, I can change the coordinate display (unit) for a project by going to: Project > Properties... > General (tab) and under the Coordinate Display section can ...
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1answer
35 views

Automatic calculation field based on line modification within QGIS [on hold]

I have a polygon layer with every cities in my region. One of the field of this layer is the population of the city. I also have a line layer which represents some bus route I would like to ...
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0answers
20 views

How can I export selected features in Processing Modeler?

This question is a follow up from a suggestion from this thread: How to export a single feature (line) from multiple layers and export to individual layers? I'm creating a batch process that selects ...
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0answers
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QGIS Atlas - Making legend and size assistant automatically update based on which area selected

I'm hoping to use the atlas feature to generate a batch of maps for London postcode districts which will show supply of private indicated by size of dots within the PCD. I was wondering if it was ...
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0answers
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How to export a single feature (line) from multiple layers and export to individual layers?

I have multiple vector layers representing a time series. Each layer contains many lines each. I want to select a single specific line from each of these these layers and save it to another layer. ...
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1answer
26 views

No module named osgeo - continued

I'm having this issue when I try to use the Polygonise(raster to vector) tool in QGIS 3.4.3 (Madeira) on a Mac running Mojave: File "/usr/local/opt/gdal2-python/bin/gdal_polygonize.py", line 36, in &...
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0answers
18 views

Load Raster from MS SQL Server into QGIS

Attempting to connect to an MS SQL database in QGIS. Database connects fine, and all the vector items load correctly. Rasters, however, appear as polygons, geometry column shows as FOOTPRINT, and ...
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0answers
23 views

ntv2 datum transformations-problem on file output

I am working with qgis 2.18.27 I have installed ntv2 datum transformations and it worked fine, but yesterday it didn't work and i am not finding the way to resolve the issue (explained below) I am ...
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1answer
34 views

Vector difference between two polygon layers by attribute

Is there a way to do a 1:1 difference between two polygon layers based on a similar attribute? The layers have the same number of features with a shared attribute. I've tried the native QGIS ...
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0answers
23 views

Filtering trees with Mac

I own about 200 acres of forest with about 350' of elevation change. I have a DJI 4 Advanced and my goal is to produce elevation maps to plan the building of one or more ponds. I've tried, and ...
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1answer
38 views

Setting maximum size of HTML map tip window in QGIS

I have a shapefile with points, and for each point I have an associated image in a folder. I'm trying to display the image as map tips, and followed the simple procedure described by Nathan Woodrow in ...
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1answer
28 views

Raster calculator giving a different result in processing modeler Qgis 3.2.3

I'm running Qgis 3 processing modeler and I am trying to invert the values of a raster file. I had previously asked this question and the answer I came up with works with the raster calculator ...
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0answers
15 views

Streetnames for QGis from Geofabrik [on hold]

I am fairly new to this, so please bear with me. I did a thorough search for my problem and could not find a solution. Unfortunately I am incapable to import street names from the geofabrik database ...
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1answer
26 views

Managing a database with GIS: How can I fill a database with attributes? [on hold]

I have a database in Google Earth from plots of land all over a city, I have information in different folders of the server. I want to analyze its financial feasibility and connect it with the server ...
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2answers
40 views

How best to divide line features into equal parts and create continuous buffer zones for them using Postgres/PostGIS and QGIS [on hold]

Having familiarized with an similar question specified on the link Dividing a buffer into segments based on path and distance, the author asked an analogous question whether it is possible to solve ...
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0answers
26 views

Graphical error while reprojecting Shapefile with QGIS [duplicate]

I'm trying to retroject Natural Earth's Shapefile of the world (Admin 0 – Countries on this page: https://www.naturalearthdata.com/downloads/10m-cultural-vectors/). Here's the original Shapefile in ...
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1answer
23 views

Points along a line tool- bug?

I'm trying to generate evenly-spaced points (1m spacing) along a line shapefile in QGIS 3.4.3. This works with certain shapefiles. However, with other shapefiles, the units automatically change from "...
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1answer
20 views

Clip Raster by Mask Layer to jpg not tiff

Is it possible to set your output file for the Clip Raster by Mask Layer tool as a jpg and not a tiff? Are there extra parameters or commands I can use to do this? I can export as tiff and convert ...
0
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1answer
26 views

The new version of qgis (2.18.20) no longer scales maps in the print composer

I've used various versions of qgis to make maps and never had a problem scaling them until now. My system updated, including my version of qgis which has the scale option but doesn't apply it to the ...
0
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1answer
40 views

How to get osm tiles in QGIS 3

I am completely lost in the dozen of solution I've found. I would like an easy solution to create an OSM basemap for my different projects with nice styling. I work directly on my computer, no ...
2
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1answer
31 views

Add items to print layout

I have created a blank print layout, now I want to add items to it like a map, legend, etc. Here is my code so far to create a new print layout, this works just fine: #This creates a new print ...
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0answers
18 views

Vector/Processing ToolBar not available QGIS 3.4/ Mac OSx 10.13.6

When I installed QGIS, I performed the bug fix as directed (going into the Environment section, adding a variable, etc), and restarted both the program and eventually my computer, but there is still ...
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1answer
36 views

Creating a fixed distance buffer from a virtual layer

First off, i'm trying to learn some python to automate scripts for basic tasks i carry out in QGIS (2.18). Below I create a virtual layer (polyline) using the following script: from qgis.core ...
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1answer
36 views

Find the closest Point from a Point which contains the same attribute

I am trying to create python code to iterate through points on 1 layer and find the closest point on another layer (Road Chainages) based on attribute values. I need to limit the search to < 20m ...
2
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1answer
19 views

Values on top of each bar of a histogram in QGIS

Is it possible to show the values on top of each bar of a histogram created with QGIS? (I am using QGIS 2.18) I know this post [Is it possible to label bar charts? addressed a similar question years ...
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0answers
10 views

QGIS: Calculate shortest route between coordinates from GPX/KMZ

i'm absolutely new to GIS Software and only need it once i guess, so i hope you'll indulge me if i don't express my needs correctly. I have alternatively a KMZ or GPX file with a lot of waypoints ...
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1answer
42 views

Circle is ellipse using Open Street Map

Currently I have a problem while developing an app - I use Open Street Map and draw a Circle and pass it to a Python backend, as central point and point on the perimeter on the Circle. Next I am ...
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1answer
19 views

Changing range of natural breaks QGIS

I have a shapefile of population points, which I've categorized to show the difference in size for each point. However, I'm not satisfied with the range of values it has set out (in picture below). ...
2
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1answer
25 views

QGIS 3.0 - Random Points w/in Polygon Expression

I have a polygon layer with 3 non-intersecting polygons(i.e., id=1, id=2, id=3). I'd like to randomly distribute 10 points within each of these polygon for 30 total, to be used as survey starting-...
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1answer
28 views

How to style 2 columns with 900 combinations without resorting to rule based in QGIS?

So I have this point layer that has 2 columns that I need styled, one of which is owner_id and the other is size. Both are integer fields if it matters. The owner_id matches with an owner name in ...