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Questions tagged [rendering]

The process of generating an image from a model.

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Rendering basemap + polygon as JPG and sharing through email

I currently have a PostgreSQL/PostGIS (versions 14/3.2) instance with several tables. When adding a new polygon through QGIS, the server sends an email with info about said layer (using listen/notify ...
d_araujo's user avatar
2 votes
1 answer
46 views

Deactivating the render checkbox of status bar with PyQGIS

I was wondering whether it is possible to activate/deactivate the Render function of the QGIS canvas: I searched everywhere online but I found nothing even about the function itself.
Kai's user avatar
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1 answer
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Importing raster with full information from ArcGis REST Service (QGIS 3.36.3)

I have asked this question about this issue, but another problem came up. I imported this layer from ArcGis REST services, but it's rendered as Singleband color data. This means that when I export it ...
Ana Clara's user avatar
1 vote
1 answer
58 views

Reset style in QGIS3

I try to erase, make blank, or no-style layer, as you want. I don't find any option in QGIS, so I try Python but from qgis.core import * import qgis.utils layer=qgis.utils.iface.activeLayer() layer....
pasqal's user avatar
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0 answers
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Render a multiband image as multiband color/ Generate and show a RGB image from multiband image

I have a multiband image which I need to render as a mutiband color image with all the defaut values. Now, in the UI of QGIS, I can do it. But in Python console, I can not do it as the images are ...
M. M. Farhad's user avatar
1 vote
0 answers
38 views

QGIS doesn't render QgsCategorizedSymbolRenderer

I'm trying to use QgsCategorizedSymbolRenderer to control the appearance of symbols in a vector layer. To create a simple layer (with circles of different colors), I'm using the following snippet: vl =...
sergiojones's user avatar
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0 answers
45 views

Rule Based Line Symbology causing weird behaviour changes on zoom

I'm fairly sure this is an actual bug and have raised a ticket in Github, but it hasn't been looked at yet and just would to see if anyone else has any other ideas that I can try, or can see anything ...
jteez's user avatar
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-1 votes
1 answer
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Rendering all bands offers only 3 options instead of multiple [closed]

I am very new to remote sensing using QGIS. I dont understand why sometimes when rendering all the bands, I only get 3 options instead of multiple. I am using sentinel 2 and I am trying to make a ...
RemoteSensingYoungin's user avatar
1 vote
0 answers
41 views

Slow rendering after switching from Geopackage to SQL Server Spatial [closed]

I have a table of 13500 points, all in OSGB 27700, which was in a GeoPackage. My QGIS 3.28.1 project displayed and stylised these very quickly when panning and zooming (almost instant). I have to ...
ChrisBB's user avatar
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1 vote
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34 views

Change the symbol on a specific element in a layer in PyQGIS

I want to change the symbol on a one specific feature in the layer after clicking with the mouse. Not using attributes. In Method canvasPressEvent(self, event) call method oznacPrvok(self, feature): ...
Stano's user avatar
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How to make mesh layer visible in JPEG map using Jupyter from QGIS

I am working with an active QGIS project. I have few layers in the .qgz file. All I want is to have a .png format map from this .qgz file using jupyter. I have added the code below. from qgis.gui ...
Noshin's user avatar
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1 vote
0 answers
116 views

OpenLayers vector layers don't render at certain zoom levels in Chrome browser

Environment: Chrome browser Typescript Angular OpenLayers 8.0 I have two OpenLayers maps side by side. They need to be synced in all respects except for one layer. So I'm using the same layers and ...
Thierry Blais's user avatar
0 votes
0 answers
37 views

GeoServer polygon artifacts on GeoPackage

I am brand new to GeoServer (2.23.1) and have it running on a Debian 11 Podman container. I can access all the sample data, which all renders as expected. I am following the GeoServer Getting Started ...
rytz's user avatar
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2 votes
0 answers
38 views

QGIS view launching rocket in 3D view

I have started using QGIS to plot the location of rockets we launch. Apart from the occasional crash, so far it has worked well. I am new to this so I might have done this the hard way. I have a ...
Nick's user avatar
  • 21
2 votes
1 answer
317 views

Events while one loads and when it finishes loading vector layer in OpenLayers v6

There was a code with OpenLayers v5, which showed a "loading" while loading a layer and the same (loading) was removed when the layer is already being shown on the map. That's because I have ...
user12538529's user avatar
0 votes
1 answer
441 views

GeoServer 2.23 error when opening layer preview

I've made a fresh new installation of GeoServer v2.23.2 on a Windows Server 2019 machine, running on Java SE v11.0.20+9-LTS-256. Everything seems to work, except for the layer preview... Whenever I ...
Cheshire Cat's user avatar
1 vote
1 answer
36 views

3D symbol transparency for polygonZ layer in 3D map view

I have a MultiPolygonZ layer and I would like to add some transparency to its surfaces but in the 3D symbol for polygon layer there is no opacity parameter (contrary to point and line layer). The ...
dmjf08's user avatar
  • 1,283
1 vote
0 answers
60 views

QGIS feature rendering order and archeological stratigraphy

For archeology purposes, I'm wondering if there is a way to do this with code using control rendering order option in QGIS: On a polygon layer I have multiple columns containg the stratigraphic ...
tonyduky's user avatar
  • 567
6 votes
1 answer
149 views

Contrast enhancement on UInt16 data type to set the maximum value greater than 255 with PyQGIS

I have loaded a raster layer with gdal DAAS plugin and would like to set a contrast-enhanced rendering, but my pixel data are in the range [536, 1747] and I cannot achieve modifying the max value of ...
vpa's user avatar
  • 163
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0 answers
37 views

Rendering cursor image

How do I get the CURSOR_IMAGE (/org/geotools/swing/icons/mActionZoomIn.png) to be rendered as nice as the ICON_IMAGE(/org/geotools/swing/icons/mActionZoomIn.png) in GeoTools map example application? /...
Paul's user avatar
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0 answers
349 views

QGIS Map composer takes forever to render

I have a project with several shapefiles, geopackages, rasters, and a XYZ tile map. When I create a Print Layout the map composer takes really long times to render the maps, even when only 2 or 3 ...
João Barreiro's user avatar
1 vote
0 answers
78 views

What rendering hints shall I use to get the map smoother?

I would like to render my maps a bit smoother. I use the shape file viewer example from GeoTools. And I would like to render it more like QGIS. Geotools origianally: QGIS: GeoTools and ...
Paul's user avatar
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1 vote
0 answers
64 views

QGIS rendering weird line segment offset for geographic coordinates

I'm seeing a weird line segment offset in QGIS when comparing a single line segment specified with geographic coordinates (EPSG:4326) to the same line using UTM coordinates (EPSG:32734). I start off ...
SeanMcLeod's user avatar
3 votes
0 answers
126 views

Performance and raster rendering problems with QGIS 3.28

I recently switched from QGIS version 3.22 to version 3.28 and since then I have had problems importing (drag and drop) raster data. When I import the same image with only 2 bands, QGIS in 3.22 uses ...
Bastian Ritzberger's user avatar
5 votes
1 answer
194 views

Set fixed reference scale for QGIS layer with PyQGIS?

Is it possible to set a fixed reference scale for a QGIS layer using PyQGIS? I try this script but it doesn't work: lyr = iface.activeLayer() r = QgsFeatureRenderer() r.setReferenceScale(400_000) ...
Vsevolod Tsukanov's user avatar
5 votes
1 answer
189 views

Rendering color for specific value using PyQGIS

I'm a QGIS beginner and I want to do a specific operation with Python scripts. I have a GeoTIFF file corresponding to a raster layer with 6 bands, and each of these bands are 2 values (like 0 and 1, ...
Jérémy O.'s user avatar
1 vote
1 answer
64 views

How to set renderer by iterate?

I have read this article to select and filter layers for iterate, it worked in general case, however when I tried to set the symbol renderer by iterate, it didn't work,which the code is as below: for ...
Panda CHENG's user avatar
0 votes
1 answer
119 views

Updating legend for graduated symbol using PyQGIS

I'm trying to programmatically modify the upper and lower range values and the label on the graduated symbol renderer of a map layer, then producing a PDF from a layout based on that map. The map item ...
Jonathan's user avatar
2 votes
0 answers
48 views

How to know if I'm looking at the source data or a downsampled overview/pyramid in QGIS?

If I build overviews/pyramids on a GeoTIFF, when I'm viewing the data in QGIS, is there an easy way to know if I'm looking at the source data or one of the overviews/pyramids? Not sure where the ...
Sammone's user avatar
  • 51
1 vote
0 answers
31 views

Adding doorways to polygonal rendering of building using QGIS

I am working on rendering some buildings and their internal floorplans for the company map, but I have run into an issue where I'm not quite sure how to mark doorways. Has anyone already come up with ...
user205011's user avatar
1 vote
1 answer
221 views

What does "tiles" usually mean in a GIS context?

I've seen the word thrown around a lot and from the way I've heard it used, there is an approach to dividing the world up into squares with various zoom levels as an effort to speed up web rendering. ...
Pensw's user avatar
  • 11
1 vote
0 answers
42 views

Print Map Rendering using QGIS

When I prepare my map it looks like this in the print preview layouts: However, when I print it, it looks like this (missing left and some top co-ordinates): Why are the co-ordinates dropping off ...
Steve M's user avatar
  • 11
4 votes
1 answer
130 views

Setting symbol rendering based on feature visible length in QGIS

I am displaying symbols at the middle of lines and I would like them to be visible only when the length of the feature displayed on my screen is long enough (which I call "visible length" in ...
Maxime Riou's user avatar
0 votes
0 answers
88 views

WMS not rendering properly within API

I am working with simple layers using lines and polygons in QGIS 3.22.11 and publishing them as a WMS to QGIS Cloud. The Map Viewer in QGIS Cloud displays them perfectly but when I bring the WMS into ...
LKM's user avatar
  • 1
2 votes
0 answers
101 views

Mapnik image render not corresponding to generated tiles

I successfully manage to install a tile server using Mapnik following this tutorial: https://switch2osm.org/serving-tiles/manually-building-a-tile-server-ubuntu-22-04-lts/ The tiles are fine and look ...
jpmaps's user avatar
  • 21
0 votes
0 answers
41 views

ESRI backgrounds render with blocks of different color schemes

I'm creating a map covering the whole Europe, in EPSG3035, using QGIS Białowieża. I'm using the "internet" extension to add "ESRI Ocean" as a background (the service is in epsg:...
Bruno von Paris's user avatar
1 vote
1 answer
87 views

Dash line with custom model not static

I have a line layer which I want to represent as dash line with fixed position. I made a custom dash model with map units for space and dash : But when I display it, the dashes move with the view : ...
dmjf08's user avatar
  • 1,283
2 votes
1 answer
35 views

QGIS Points show up for one field/value but not another

When I added a csv file as a delimited layer, it shows up on the map fine: I classified and changed the symbology of one field/value for bottom depth data and it worked fine too: When I tried to do ...
Kimarie Yap's user avatar
0 votes
0 answers
334 views

How to convert OSM file ot PNG tiles on MacOS?

Im trying to create an offline map with Leaflet. So I got this package from https://download.geofabrik.de/africa.html Is there any way to convert osm.pbf to PNG tiles on MacOS?
Illia Panchenko's user avatar
1 vote
0 answers
255 views

Improving WMS screen rendering in QGIS

I'm working with QGIS 3.22.7-Białowieża and I've added a WMS layer in my project through http://6ae9b70.online-server.cloud/geoserver/n2000/wms. But the rendering quality in the canvas screen is not ...
jpinilla's user avatar
  • 3,230
1 vote
0 answers
79 views

QGIS rule-based filtering not working

I'm having a problem with rule-based filtering in QGIS. I created a rule and tested it, and it showed that it gets hits. Below shows the attributes to which I wish to apply the rules: The following ...
Mark Coletti's user avatar
1 vote
0 answers
97 views

Find min and max values of a field (column) in a feature layer

I am using ArcGIS API for Javascript in a Nuxt application and I would like to find the max and min values of a field in a feature layer hosted on ArcGIS. How to do that? Here is the code. The values ...
Maxime's user avatar
  • 111
2 votes
0 answers
309 views

QGIS takes forever to render ArcGIS World Imagery

I'm currently using QGIS 3.16.5. I am using the ArcGIS World Imagery - High Resolution 30cm Imagery layer to select training data for land cover classification. For the last two months, I was able to ...
Allie Nguyen's user avatar
-1 votes
1 answer
196 views

Software used to plot GPS data on a map to be saved as an image

I have GPS data from some bike rides which I'd like to use to create a video overlay showing my position on a map at a given point in time. The plan is to find some library for Python or JavaScript ...
mowwwalker's user avatar
6 votes
2 answers
809 views

Applying HDR (high dynamic range) rendering in QGIS

I want to automatically (without manual adjustments) apply HDR (high dynamic range) rendering to Sentinel-2 satellite images so that the image can distinguish between very bright objects (e.g. clouds, ...
Comrade Che's user avatar
  • 7,251
1 vote
2 answers
385 views

Querying mbtiles is slow in GeoServer

MBTiles rendering is unreasonably slow on our GeoServers, and we're trying to optimize them. When I set the log level to GeoTools Developer logging, I can see a delay in logs each time a log similar ...
Hossein Ebrahimi's user avatar
0 votes
1 answer
222 views

GeoServer - Response Time (Rendering Geo data) [closed]

I'm having a hard time finding any documentation on the acceptable response time for a WMS GetMap request. In the area of HCI regarding usability, the acceptable response time is 0.1s to 1s. But we ...
Ricardo David's user avatar
1 vote
1 answer
53 views

GeoServer renders blue and red backgrounds occasionally

It looks like this: As you can see some tiles are rendered correctly. Our data source is an mbtiles file, styled with a mapbox style (we had to install mbtiles and mbstyles extensions).
Hossein Ebrahimi's user avatar
1 vote
0 answers
40 views

I have imported CSV files as new layers, saved them as shapefiles, but the points are not rendering onscreen: they are at the top of the stack [closed]

M1 Mac, OS Monterey 12.2.1; QGIS v 3.16. If I select one of these layers and choose 'zoom to layer', it zooms to where the points should be but they are not visible, so clearly, their positions are ...
mgts24's user avatar
  • 21
2 votes
1 answer
131 views

Raster data rendering incorrectly in QGIS

I just installed QGIS on a new Macbook and am experiencing problems. When I add a raster layer and zoom in and out, the position of the raster changes rapidly. To illustrate the problem, below is a ...
Jan Pisl's user avatar
  • 736

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