Questions tagged [rendering]

The process of generating an image from a model.

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35 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 ...
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16 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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1answer
28 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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1answer
38 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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20 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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1answer
47 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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1answer
27 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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1answer
44 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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1answer
44 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 ...
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1answer
33 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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24 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 ...
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1answer
63 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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24 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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23 views

qgis2threejs viewer showing poor resolution

When I open qgis2threejs in preview mode the resolution of the preview is poor. It used to be very good and would render as you moved around eth preview screen.
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1answer
116 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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42 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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1answer
235 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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26 views

QGIS - Vector layer rendering - dissolving objects

I have a vector line layer for a stream network. I'm styling the layer with a 100 map unit line width with 50% opacity. Opacity is set to 100% within the symbol class and opacity is set in the Layer ...
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1answer
144 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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0answers
27 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
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1answer
82 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.
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31 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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1answer
73 views

Why mapping a GeoTIFF world map in QGIS at low zoom level (0~2) results in a strange behavior?

I have created a GeoTIFF world map, but I notice that it cannot be rendered correctly at zoom level which are low (e.g. zoom level 0, 1, 2). Is it a predicted behavior or how can I fix this? I also ...
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73 views

Shapefile has feature that I cannot edit on QGIS 3.10.13 on Windows 10

I am editing a map with multiple layers. The project includes a shapefile for buildings that has numerous rectangles in black with 100% transparency as a single symbol, The layer file is at the top of ...
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0answers
64 views

Pre-rendering tiles fail, only once in a while

I've customized the https://github.com/Overv/openstreetmap-tile-server and broken it down into two images, a Tile-Server and a Postgis-Server. Both Tile Server and PostGIS Server are up and running in ...
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40 views

import pyvista / VTK make QGIS crash

I'm trying to port 3D rendering into QGIS through VTK/pyvista renderer. Everything works fine ... untill I quit QGIS. There vtk QGIS crash, but I can't figure out why ... I've issued the problem at ...
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1answer
23 views

Render WMS at fixed scale (static image effect)

I have a point layer that I'm rendering as a WMS using GeoServer, the points look like a continuous surface and 'blend' great at about 1:10 000. I want to keep the WMS rendered at that scale, ...
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2answers
222 views

Rendering single-band raster in Python with set color ramp

I have a set of single-band gray-scale rasters that I want to save as a rendered GeoTIFF/image that is colored according to a specific color ramp. For example, if I had some NDVIs that range from a ...
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1answer
117 views

Blending DEM hillshade with QMS basemaps

I would to keep the features of the ESRI Gray (Light) basemap crisp and clear on top of a hillshaded DEM in QGIS. So far, my attempts have not been very successful. The ESRI Gray basemap shows main ...
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0answers
36 views

Getting tile cache creation status on ArcGIS Server

I am creating a server side tile cache on ArcGIS Server 10.6.1 using ManageMapServerCacheTiles_server with the wait option as the Python/ArcPy example suggests. Unfortunately this process takes 10+hrs....
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1answer
176 views

Displaying overlapping lines as separate offset lines in QGIS3

I'm drawing lines in a map that represent cables in underground pipes. Sometimes there are multiple cables going through the same pipe, so I'd like to draw each cable as a different line, but want it ...
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0answers
44 views

How to set Symbol levels in renderer by PyQGIS

I know that can use renderer.setUsingSymbolLevels(True) to enable the symbol levels, by how can I set the symbol level by PyQGIS? I have tried many methods, but none of them can implement this ...
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1answer
111 views

Configure symbol levels using PyQGIS

I have a QgsCategorizedSymbolRenderer and I'm trying to configure it so that symbol_a: appears at the top of the layers window legend, but also appears on top of all other QgsRendererCategory symbols ...
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0answers
41 views

Rendering hill shade after texturing it

Does anyone know if it's possible to: make a hillshade, render it with blender go to Photoshop and place a layer on top of it [like a tint, color bands, or terrain data] and then render it once more,...
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1answer
111 views

Exporting multiple maps on rendercomplete in OpenLayers

I have this project where I have 4 different maps next to each other. These maps have different layers on top of them so they can be compared. Now I want the user to be able to export those 4 maps to ...
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0answers
60 views

Examples where customized vector Google Maps rendered via WebGL are used? [closed]

Some of the new features are exciting in Google Maps. Creating custom map layers in the cloud and specifically rendering vector maps in WebGL. https://cloud.google.com/blog/products/maps-platform/...
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1answer
86 views

Changing Mapnik style -- generating empty tiles/images

I got my osm2pgsql/PostGIS/Mapnik/Nik4 setup up and running. I have tested it with the openstreetmap-carto style and everything works well. Now I want to change the style to Mapbox' pencil style (...
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1answer
194 views

Falsecolor raster from multiple rasters in QGIS

How can I combine multiple single band rasters into a falsecolor RGB background in QGIS? I can, of course, use the multiband color renderer to select specific bands, call them A1,A2,A3 from a single ...
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0answers
25 views

Automatically setting standard Raster style when loading raster sets in QGIS?

For my project I work with a lot of raster data sets and when loading the data into QGIS they render with a white background which I would like to see transparent (no-data). I also worked before with ...
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1answer
149 views

Blending features in QGIS: Approximating road edges for map render

I'm having trouble getting the right render for the tertiary roads and service roads look in my map render. I'm trying to get road edges like in the old USGS topo maps: Notice how the road interior ...
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0answers
132 views

Points disappeared not rendering

Using QGIS 3.10 - new data points are disappearing after clicking on save. Layer is digitising points (park assets) which have been identified from field capture. Up until yesterday April 17, 2020, ...
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0answers
74 views

An error IOExceptionERROR: parse error - invalid geometry Hint: “POLYGON ((” <— parse error at position 12 within geometry

I'm a beginner in GeoServer. I moved a layer using the PostGIS (version 3.0.1) module in QGIS (version 3.12.1-București) to the PostgreSQL 12 database without problems and it looks good in pgAdmin 4. ...
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0answers
32 views

QGIS Composer causing QGIS to crash when opening a certain template

Every time I try to open a certain template in the Print Composer, I get a blank window and no response from the program. This then causes the whole program to crash. This particular template is ...
3
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1answer
70 views

DEM elevations not appearing when rendered to single band pseudocolor

When rendering DEM file to single-band pseudocolor, the elevation values are not appearing. Attached are images of the proper template and my layer properties. Please let me know what other data would ...
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0answers
109 views

Does the projection of a PostGIS table affect the rendering speed in QGIS?

I am interested to know whether changing the projection of a PostGIS table will affect the rending speed when viewing it in QGIS. I have two layers coming from QGIS which are exactly the same and ...
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0answers
58 views

QgsMapCanvas map rendering issue

Background : I am making a raster + vector map navigation application using Qt4 and QGIS in C++. Map is loaded inside QgsMapCanvas, which is quite slow, mapcanvas is the part of QGraphicScene, ...
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44 views

How to process large size satellite images without loading the entire image into the memory?

I am working with large size satellite images having size around 25 GB. My system is having 8 GB of RAM and gets entirely freezed after reading the image. What is the efficient way to process images ...
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4answers
619 views

Speed up rendering background vector data in QGIS

I have a geopackage of ordnance survey background data (field boundaries, rivers, roads, etc). I won't be doing any analysis on this data it will purely be used as a background / basemap. My problem ...
4
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0answers
138 views

Applying graduated symbol renderer only on some features using PyQGIS

I have set up a graduate symbol renderer (QGIS cookbook - Graduated Symbol Renderer), and I am now trying to make it conditionally applied to some features only, depending on one (or more) attributes. ...
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0answers
364 views

How to add the mapview layers in Leaflet maps in r shiny app?

server <- function(input, output){ output$map <-renderLeaflet({ df_data <- uploadshapefile() ... df_data <- as.data.frame(df_data) df_data@data$ id <- nrow(df_data) lm....

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