Questions tagged [rendering]

The process of generating an image from a model.

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19 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
118 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
25 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, ...
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1answer
38 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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19 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
42 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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59 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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28 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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24 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
20 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
70 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
61 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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26 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
110 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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34 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
72 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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35 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
46 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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26 views

OSM: Don't render administrative boundaries

I have created my own OSM server to pre-generate tiles for later offline use in a desktop app I'm currently coding (I save the tiles in a local SQLite db). Since I followed blindly a tutorial found ...
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30 views

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

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
51 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
86 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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13 views

How do I change default raster properties 'min/max values' settings from “Estimate (faster)” to “Actual (slower)”?

I'm tired of updating it manually for each raster. The exact issue is listed as "solved" and "Should be fixed in QGIS 3" in this bug report, but I cannot find the correct settings ...
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18 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
129 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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89 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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11 views

How to upload my custom maps and query for location in those maps using my web portal

I have multiple maps created for a specific state. Now I want to upload those maps into some GIS server. Also on my website I want to query for each of these maps depending on option chosen. Also if a ...
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0answers
67 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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20 views

Any idea what can cause performance decrease on AGOL after fixing “analyze errors” in MXD?

In our map services my predecessor used local coordinate system for the MXDs, which is really not needed, and the symbology field came from an Oracle database join. The webmap was fast, but i thought ...
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31 views

Polygon rendering issue in QGIS 3.4 Print Layout

Several of my students have had a strange issue using the Print Layout in QGIS 3.4. They are using two sets of data in the map canvas, one is a subset of the main dataset (which is used as a ...
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30 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
58 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
90 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
37 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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27 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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3answers
402 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
96 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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239 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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1answer
116 views

Downloading only one band in Google Earth Engine without the RGB bands

I have calculted the NDVI of specific plot and download it in order to run analysis in QGIS. The image on GEE had only one band: the calculted NDVI, but whenever I open it on QGIS I have 4 bands: NDVI ...
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0answers
27 views

GeoServer problem zoom levels

I have created the layer (geopackage data file) and when I do layer preview from, don't appeared tiles in the different zoom levels. Also I have tested in QGIS and everything is ok. Attached case you ...
1
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1answer
262 views

OpenLayers select.on event listener fires multiple times (renders multiple)

I am using hook React. How to render event only once instead multiple times useless? When I am selecting a feature, it renders multiple times var select = new ol.interaction.Select(); const translate =...
2
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0answers
29 views

Howto “Enable feature simplification for newly added layers” with PyQGIS

Having some performance issues getting huge vector layers to be drawn the first time under heavy system load, I am interested to test what is called in QGIS application "Enable feature simplification ...
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2answers
106 views

Count features in layers and categories

I want to automatically count features in my opened layers, and add the result in the layer name, with pyqgis. I can do it with this code : layers = QgsProject.instance().mapLayers().values() for ...
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1answer
268 views

Local OSM Tile Server not rendering

I searched this issue in other topics but only found outdated topics with previous versions of Ubuntu. I'm using Ubuntu 18.04 in my laptop and I'm following the tutorial available at https://...
1
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1answer
179 views

Speed up GeoJSON clustering and rendering?

I am rendering 10,000 points with Leaflet's markercluster library. I fetch these 10k points from our server. This takes about 700ms. It takes Leaflet about 3 seconds to cluster these points and ...
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1answer
51 views

Are these glitches in my map rendering caused by not projecting WGS84 coordinates to Cartesian?

I'm attempting to render continental geometric data stored within an R-Tree in a SQlite database. The data is store as long/lat WGS84 and I'm trying to render it to 256px PNGs for displaying on a ...
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0answers
18 views

Overlapping polygons produce rendering artifacts a low zoom [duplicate]

I have duplicated this problem in both QGIS and mapnik. For this question, I will show the problem using QGIS. I have imported heightmap images along a coastal area. I then added an overlay layer ...
2
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1answer
184 views

Display adjacent polygons without the shared borders becoming darker than the others?

When plotting adjacent polygons, for instance, the states of a country, the lines are usually thicker/darker in the border between two polygons, compared to a polygon on the edge of the map. That ...
2
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2answers
83 views

Heatmap doesn't render the same as map layout

Im trying out a heatmap using QGIS. It looks good on the layout manager but when I export it the hotspots render a lot smaller on the map. I played around with the export settings, layer settings, ...
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0answers
144 views

Mapnik Slow tile generation with i9-990K, 64GB ram and NVME SSD Database

I have setup an OSM tile server following the guide at: https://switch2osm.org/manually-building-a-tile-server-18-04-lts and https://github.com/giggls/openstreetmap-carto-de. My database is stored on ...

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