Questions tagged [rendering]
The process of generating an image from a model.
366
questions
1
vote
0
answers
18
views
Unable to load layers in Lizmap web client geoviewer v.3.6.6 installed in Windows 11 (Workstation)
After following the installation procedure outlined in the following link: https://github.com/NaturalGIS/qgis_server_and_lizmap_on_windows, everything seemed to work correctly. Both Apache, PHP and ...
0
votes
0
answers
41
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 ...
- 101
0
votes
0
answers
27
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 ...
- 1
2
votes
0
answers
34
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 ...
- 21
2
votes
1
answer
67
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 ...
- 119
0
votes
1
answer
174
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 ...
- 329
1
vote
1
answer
24
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 ...
- 1,097
1
vote
0
answers
51
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 ...
- 527
6
votes
1
answer
128
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 ...
- 163
0
votes
0
answers
34
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?
/...
- 407
0
votes
0
answers
146
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 ...
1
vote
0
answers
54
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 ...
- 407
1
vote
0
answers
49
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 ...
- 19
3
votes
0
answers
103
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 ...
5
votes
1
answer
108
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)
...
- 1,037
5
votes
1
answer
134
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, ...
0
votes
0
answers
90
views
Translate GeoJSON tile coordinates to X,Y coordinates on canvas 500 by 500
I have GeoJSON vector tile which I want to render to HTML canvas 500 by 500. How can I translate the lat, lon coordinates of a line string to X,Y points on the canvas?
{
"type": "...
- 21
1
vote
1
answer
47
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 ...
- 33
0
votes
1
answer
73
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 ...
- 31
2
votes
0
answers
41
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 ...
- 51
1
vote
0
answers
27
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 ...
- 43
0
votes
0
answers
97
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. ...
- 1
1
vote
0
answers
41
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 ...
- 11
4
votes
1
answer
125
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 ...
- 479
0
votes
0
answers
76
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 ...
- 1
2
votes
0
answers
79
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 ...
- 21
0
votes
0
answers
36
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:...
- 861
1
vote
1
answer
65
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 :
...
- 1,097
2
votes
1
answer
33
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 ...
- 21
0
votes
0
answers
291
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?
1
vote
0
answers
189
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 ...
- 3,180
1
vote
0
answers
72
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 ...
- 11
1
vote
0
answers
94
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 ...
- 111
2
votes
0
answers
257
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 ...
- 21
-1
votes
1
answer
155
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 ...
- 99
6
votes
2
answers
602
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, ...
- 7,084
1
vote
2
answers
296
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 ...
- 155
0
votes
1
answer
167
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 ...
1
vote
1
answer
51
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).
- 155
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 ...
- 21
2
votes
1
answer
124
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 ...
- 706
2
votes
0
answers
67
views
How to speed up the rendering speed of layers with multiple virtual fields?
I am inputting data for power lines and tried using the normal field and imported it in PostGIS.
But the some of the data inputs I needed must be refreshed constantly to obtain. So instead I used ...
- 85
1
vote
0
answers
85
views
Setting mesh layer visibility in QGIS application?
I am utilizing the QgsMeshLayer class to load a NetCDF file that contains multiple variables (temperature, velocity, etc). I want to be able to set the visible dataset by variable name. I know how ...
- 175
2
votes
1
answer
1k
views
Using ArcPy & UniqueValueRenderer to assign specific colors to points based on value
I have code that amends the symbology of a layer in ArcGIS Pro 2.9 via an IDE. Everything works apart from the color of the points, which appear to be being picked at random (different every time I ...
- 43
2
votes
1
answer
355
views
PyQGIS Legend doesn't update with renderer
I am using QGIS 3.22.2.
I am relatively new to QGIS and have been trying to automate part of a workflow, including changing the rendering of a raster. Following the PyQGIS cookbook, I have this code:
...
- 23
5
votes
1
answer
224
views
Hiding symbol if labels not displayed due to overlap using QGIS
I have a trouble hiding points that don't have a label due to label overlap. In my example below, there are some points where the label is not shown.
How do I hide the points that don't display a ...
- 113
2
votes
0
answers
58
views
Render polygons in order north to south down in QGIS
In QGIS I have a set of polygons that I want to render in the order north to south:
I understand that Control feature rendering order in the Symbology dialog is the option I need.
I came up with the ...
- 121
0
votes
0
answers
142
views
Points displacement function in QGIS does not show in layer properties box
QGIS has a points displacement renderer (featured in section 15.1.3.1.17 at qgis.org) in the layer properties box that I need to use. However, QGIS does not show me the option of the points ...
- 61
0
votes
1
answer
55
views
Multifactor point symbology in QGIS [closed]
I need to symbolize a points currents layer with arrow markers varying by magnitude and direction.
Is there a built-in method to created graduated symbology based on the ranges of two variables or do ...
- 3
0
votes
2
answers
1k
views
Pre Rendering tile using render_list command is extremely slow
I have created a OSM tile serving server using osm2pgsql with entire asia tiles. I am using Ubuntu 18.04, 32 CPU cores, 132 GB RAM, 1 TB HDD. This I believe is a reasonable hardware. Now, I feel that ...
- 101