Questions tagged [rendering]

The process of generating an image from a model.

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ArcGIS JavaScript ClassBreaksRenderer not working, layer shows only default symbol

I'm adding a ClassBreaksRenderer to my ArcGIS map's GeoJSONLayer and for some reason only the default symbol is rendering. // Color Logic const low = { type: "simple-fill", color: ...
2 votes
1 answer
25 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 ...
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11 views

How to add colormap renderer from a classified single band "QgsRasterLayer" with PyQGIS

I'm trying to add a colormap to a TMS service which is serving single band PNG with values ranging from 1 to 11. At this point, the layer renders in black (low values between 1 and 11) but I would ...
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0 answers
54 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
67 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 ...
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1 vote
0 answers
51 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 ...
0 votes
0 answers
30 views

How do I know if the marker symbol layer will be displayed during rendering?

One of the layers of my marker symbol is displayed only when the data-defined override condition is met. Here is the code in which I get the layers of my marker. I need to find out whether or not this ...
1 vote
0 answers
40 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 ...
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Selecting a field in an ArcGIS layer/map in a Nuxt application result in adding legend colorSlider on top of each other in the same div

I am using ArcGIS in a Nuxt application. I have got a map with a feature layer (hosted on ArcGIS) and a legend with a color slider in the top-right corner. The user can visualise different fields from ...
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2 votes
0 answers
84 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 ...
-1 votes
1 answer
82 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 ...
6 votes
2 answers
187 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, ...
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1 vote
2 answers
125 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 ...
0 votes
1 answer
49 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
37 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).
1 vote
0 answers
37 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 ...
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2 votes
1 answer
86 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 ...
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2 votes
0 answers
43 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 ...
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1 vote
0 answers
38 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 ...
0 votes
0 answers
34 views

Transform top-down vector layer to angled view

I have a 3D model of a fictitious city and I'm creating a little OpenStreetMap/Google Maps clone for it. The current workflow is fine: I render the fake satellite view pictures from a top-down ...
1 vote
1 answer
307 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 ...
2 votes
1 answer
140 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: ...
5 votes
1 answer
93 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 ...
2 votes
0 answers
44 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 ...
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0 votes
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86 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 ...
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0 votes
1 answer
47 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 ...
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0 votes
2 answers
505 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 ...
2 votes
1 answer
426 views

OSM tile server "renderd" keeps using wrong user

I set up my machine to serve tiles following instructions on https://www.linuxbabe.com/ubuntu/openstreetmap-tile-server-ubuntu-20-04-osm. I am currently on Ubuntu 20.04.3 LTS. I imported the data into ...
8 votes
1 answer
176 views

Layer not repainting using PyQGIS

I'm trying to change the color ramp for a raster layer using PyQGIS. What I have works, but the layer doesn't redraw. However, if I open the layer properties and click "Apply", the map ...
0 votes
0 answers
179 views

ESRI multipatch file to 3D file

I have almost zero experience with GIS, but I'm trying to convert a 3D map into a 3D file I can work with (like STL, OBJ, FBX, COLLADA, 3DS, etc). This is the dataset (and if possible, I would want to ...
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98 views

Visualising ground radar in QGIS using rendering

I have GPRI intensity ground based radar data as data validation for my SAR analysis. As this does not appear to be a multi-band image, how do I render this on QGIS so I can see my targets? I have ...
1 vote
0 answers
26 views

QGIS 3D symbols disappear in 3D Map View while tilting and zooming map canvas

In QGIS, I am creating a 3D Map view of point data (Phong spheres) in a mountainous area (2m DEM). It all worked fine with v3.10. After updating to v3.20 the spheres start gradually disappearing upon ...
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2 votes
1 answer
98 views

Extracted XYZ/WMTS/REST Rasters from USGS and ArcGIS Online Not Rendering

I'm not a regular GIS user. I'm trying to extract (save for offline use) topographic maps from a couple different sources, but when I load the extracted file, it's either gray with a pattern of white ...
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1 vote
1 answer
121 views

Creating categorized renderer with SVG symbols using PyQGIS

I'm trying to create a renderer with SVG symbols and I can't seem to find any example on this. Inspired from categorized renderer for regular symbols, I wrote this, but I get an error saying that the ...
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0 votes
0 answers
29 views

ArcMap drawing 0-values in raster as blank

I am visualizing a series of rasters with floating point data ranging from -30 to +50. In ArcMap 10.7, I am using a Classified color scheme for symbology that bins the values into 10's. At my desired ...
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2 votes
1 answer
98 views

Changing centroid marker to font marker using PyQGIS

I'm trying to get a "P" font marker in the middle of my polygon layer. So far, I've managed to make a simple centroid marker (the basic one) appear on my polygons. The code doesn't bug, but ...
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2 votes
1 answer
72 views

DXF rending in QGIS independently of symboloys

I have imported a DXF file from AutoCAD into QGIS 3.20 and it has applied the rendering that it had in AutoCAD. I am trying to figure out how QGIS detects these settings so that when I run a process ...
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1 vote
1 answer
76 views

PYQGIS rule-based renderer with SVG symbols

I am trying to create a rule-based renderer with different SVG icons for each class. For some reason, I keep getting the error : Rule' object has no attribute 'QgsSvgMarkerSymbolLayer' Why do I get ...
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3 votes
1 answer
127 views

How to speed up the rendering time to display drone-derived orthophoto in QGIS

I have a 4cm resolution drone-derived image GeoTIFF that I am displaying in QGIS. The image is approx 600mb, I have a compressed version (BIGTIFF=YES, TILED=YES) approx 250mb. Both when loaded into ...
0 votes
1 answer
42 views

Bad image output in QGIS [closed]

I have created an Orthomosaic .tiff file from multi-spectral images using Agisoft Metashape. Now that I am trying to analyze the image using QGIS, I get a bad image, and I do not know how to fix it. ...
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2 votes
0 answers
54 views

Rendering layers of multiple CRS systems(EPSG: 4326 and EPSG:3857)

I m trying to render layers of multiple CRS systems on QgsmapCanvas using QGIS3 C++ APIs. When I render multiple layers of only one CRS( like EPSG:4326 ) at a time, everything works fine. But when I ...
1 vote
1 answer
797 views

Point feature symbol not showing in ArcGIS Online but renders fine in ArcGIS Pro

I've published a map layer of point features with several basic symbols for unique values. One layer that I published a couple years ago is displaying correctly, but a new layer that's almost the same ...
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1 vote
0 answers
42 views

ArcGIS Python API - feature renderer faild in AGOL

I am trying to save a feature service in AGOL using ArcGIS Python API with symbols. I use the same symbols in a map widget and the features appear correctly but when I save the feature as a feature ...
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4 votes
1 answer
196 views

Limit the number of features rendered in a map

I have a layer of village points and I want to limit the number of features rendered to a maximum of 50 points. I tried using Layer Properties > Labels > Rendering > Limit number of features ...
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1 vote
0 answers
62 views

Rendering PostGIS layers in QGIS

I am running QGIS Desktop 3.18.2 on Ubuntu, but I have observed this issue on other operating systems. When I query a relatively small table (~300 simple polygons) from PostGIS on a remote server, it ...
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4 votes
1 answer
939 views

QGIS low CPU usage why?

I work with the latest QGIS program on bike trail maps. I monitor my CPU and memory usage and for years the CPU usage hovers around 20%, never to peak or even hit 50%. This just seems odd that I have ...
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5 votes
1 answer
179 views

Why QGIS crashes when constructing QgsGraduatedSymbolRenderer object by QgsGraduatedSymbolRenderer.createRenderer() method?

Today I want to render a vector layer in QGIS by using PyQGIS QgsGraduatedSymbolRenderer renderer. When I directly construct it by using the constructor, it works. But when I want to use the ...
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3 votes
0 answers
33 views

Prioritize label rendering

It seems that by default, vector layer labels only render after everything else is loaded. Some wms/wmts feeds being very slow, this means you have to wait for a while before you can see your labels, ...
3 votes
1 answer
358 views

"Scale range" vs "Scale dependent visibility" when labeling features using QGIS

What is the difference between "Scale range" vs "Scale dependent visibility" settings when labeling features using QGIS? From my perspective they are identical.
1 vote
0 answers
69 views

Filter symbols in QGIS similar to labels for anti-collision?

I am using the GeoNames data in a PostGIS 2.5 table to populate cities on a map in QGIS, but with millions of entries it is very crowded with overapping making it useless without some sort of ...
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