Questions tagged [rendering]

The process of generating an image from a model.

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renderd: “rendering failed with command 4, pausing.” when rendering tiles but no error in syslog

I just had to rebuild my server and I'm having an issue when trying to pre-render my tiles. I'm getting a lot of "rendering failed with command 4, pausing." I am getting tiles (so renderd is running) ...
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14 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 ...
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1answer
34 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 ...
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2answers
41 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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35 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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1answer
30 views

ArcGIS JavaScript API set size of CSV Marker by attribute

Using ArcGIS Javascript API 3.29 is it possible to set the size of a CSV Layer marker using a field value through the renderer? Using this EXAMPLE in their samples, they add a CSV layer to the map ...
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1answer
28 views

mod_tile renders OpenStreetMap without some water

My rendered map: The same view from openstreetmap.org: What went wrong? I downloaded europe_latest.osm.pbf and nigeria_latest.osm.pbf and imported these files using --append. Now, I'm trying to ...
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20 views

Rendering .tif in ModelBuilder?

I'm working with ArcGIS Desktop 10.7 ModelBuilder and was wondering if there is a way to automatically export the TIFFs my model creates into a rendered TIFF. Below is a photo of what I'm trying to ...
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1answer
68 views

Set layer rendering 'refresh layer at interval (seconds)' using PyQGIS from python console?

I am trying to use the python console to achieve the following manual procedure of setting each layer to refresh automatically at a specified time interval. The manual process: Layer Properties > ...
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2answers
47 views

Change rendering order of objects in MapInfo table?

i have one big MapInfo file where i did a lot of digitizing work. Now i have the problem of disapearing points under polygons (or polygons under polygons, lines under polygons etc.). How can i ...
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1answer
25 views

Measure loading time of layers in Mapserver

I use mapserver to generate one single tile per request. The mapfile contains several layers and I would like to know which of them is the bottleneck that needs too much time to render. WIth shp2img I ...
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1answer
28 views

Append Symbol Layer PyQGIS3

I am updating a QGIS2 plugin to QGIS3. The following code in PyQGIS2 works: association_symbol = QgsSymbolLayerV2Registry.instance().symbolLayerMetadata("ArrowLine").createSymbolLayer({ ...
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1answer
41 views

Renderer and Rules in QGIS

This question is somewhat involved, so please bear with me. I am updating several plugins from QGIS 2 to 3. Most of them include accessing spatialite databases and creating layers from the various ...
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55 views

How to render vector data with muliple geometry types to georefrenced raster

I am using OSM vector data which has been converted into shapefiles. I have polygons representing buildings, landuse and lines representing roads as shown bellow: I want to assign some symbology to ...
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2answers
88 views

How to convert multiple shapefiles of different geometries into a georeferenced raster

I have multiple shapefiles extracted from OSM vector data, as shown in the image bellow: How can I render this into a raster of a specified resolution? Is there a way to do that using QGIS or ...
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33 views

QGIS Styles: How do I save rendering preferences in a style for future automation?

The following is in regard to a point layer in QGIS 3. Under Layer properties > Rendering > 'Refresh layer at interval (seconds)' I have set the interval to refresh every one second. The point ...
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17 views

ArcGIS Server Sporadically Exports Blank Image / renders blank image, for a published map service

For several months our map services in our ArcGIS Server 10.5.1 setup occasionally fail to draw/render when browsing to their export REST endpoints. Our setup is in the cloud and we use cluster setup....
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66 views

Integrating User Defined Coordinate System into PyQGIS?

Here is my current code: #Loading of post-wrf(raster) files starts here crs = 'USER:100000' QSettings().setValue('/Projections/defaultBehaviour', 'useGlobal') QSettings().setValue('/Projections/...
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39 views

Taking snapshot from for loop in PyQGIS 3?

I am pretty new in PyQGIS and programming in general, and I am trying to get images from four different layers. If I do just for one time with Qtimer option, works... but the problem appears when I ...
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1answer
47 views

ArcGIS Javascript API - Use array of values for breaks in Class Break renderer instead of a range for a Dynamic Layer

I'm trying to use ClassBreak renderer in ArcGIS API v3.27. I have a dynamic layer with ZIP as one of its fields. I would like to add breaks based on the ZIP value. But the class breaks usually don't ...
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1answer
136 views

OpenLayers 5 and GeoJSON with two geometry attributes per feature

I have a GeoJSON file in which each feature has two geometry attributes, one is the default geometry property defined by the GeoJSON standar, and the other one is a property under the standarized ...
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41 views

Reproducing raster color rendering from ArcMap in QGIS? [closed]

I have a 16-bit satellite geotif. These images can be visualised in a number of ways, depending on which stretch you apply. The default stretch applied by ArcGIS to these images produces a "natural" ...
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1answer
76 views

Rule-based rendering in qgis2web client is not working

I made a simple map with polygons of the staates of africa and used the rule-based renderer for different colors to tint them. When I tried to load or export this map with qqis2web I didn't get ...
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33 views

Custom rendering ocean in Maperitive

I would like to render a map from openstreetmap data that includes coastline with the tool Maperitive. The standard behaviour seems to be that it renders ocean in the standard blue color no matter ...
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0answers
51 views

Setting raster visibility on/off in QGIS Python API 3

I'm having a bit of a trouble migrating an algorithm from pyqgis 2 to pyqgis 3. The thing is I want to make visible and invisible a series of layers as I iterate through a list and render some images. ...
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2answers
39 views

Don't show empty categories in classified style

I have a geojson file containing line and polygon features. I want to render them according to the field Feature Type which contains different types. When I use categorized symbology, it creates ...
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0answers
139 views

Rendering Google Terrain in QGIS Layout Manager

I am using the Google Terrain map (via XYZ Tiles). This seems to make the system very slow, and when making a .jpeg through the Layout Manager, the Google Terrain will not display (render) when ...
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1answer
46 views

ArcGIS Online vs JS rendering differences

I am experiencing some issues working with ArcGIS JS API v4.9. I created a map on my offline software that I imported into ArcGIS Online. The map contains polygons with labels inside them and some ...
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56 views

Colorize digital surface model (DSM) with continuous color

I am running digital surface model (DSM) algorithm. Below is the result of DSM read with QGIS3. On the bottom left, it shows this image is colorized by five discretized colors. The problem is that ...
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1answer
47 views

If the .osm file encodes all geospatial data, or if Mapnik encodes part of it too [closed]

I have downloaded the whole OpenStreetMap .osm file, and not wanting to decompress it or try to open it in a text editor (at almost a terabyte in size), I am looking at this XML as an example: <?...
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1answer
76 views

Points in hosted Feature Layer causing rendering issues in ArcGIS Javascript API

I have Feature Service in my ArcGIS Online account that is made up of a number of feature layers. The feature service was created by publishing a file geodatabase. I am adding the Feature Service as a ...
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2answers
126 views

How to optimize this query for (OpenStreetMap) map tiles rendering?

I'm trying to optimize my OpenStreetMap map tiles rendering. This is one of the queries renderd makes to PostgreSQL: SELECT ST_AsBinary("way") AS geom, "type" FROM (SELECT way, ...
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63 views

How to call correctly QgsMapRendererJob in pyqgis3

I'm trying to modify ma pyQgis2 code to run in pyqgis3. That is custom application, that shows canvas with appropriate layers and settings and I can't refresh canvas with pyqgis3. pyqgis2 code that ...
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2answers
502 views

CSVLayer doesn't show HeatMap in Angular 6

I am using ArcGIS JavaScript 4.8 API and I have integrated the CSVLayer to an Angular 6 application but it is not showing up any heat map. The legend shows that it is getting renderer data and heatmap ...
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0answers
20 views

Increasing QGIS 3.2 (Bonna) Render Size on my Macbook Air [duplicate]

The render size for the project appears to be small in the QGIS 3.2 for MacOS. Any tips how to increase this/make it wider?
2
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1answer
203 views

Heatmap not working on FeatureLayer (ArcGIS JS API 4.8)

I tried my best but didn't get success to show heatmap on FeatureLayer with latest ArcGIS JavaScript API 4.8. My Code is located here. I used HeatMapRenderer to render the point on the map as the heat ...
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0answers
191 views

QgsMapCanvas.setExtent() has no effect when loading and rendering many layers

The following script is intended to load a pile of vector layers (50 times the same) and after loading to set map canvas center and scale: from qgis.core import QgsProject, QgsVectorLayer, ...
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54 views

Geoserver Rendering Error

For specific zoom level Geoserver cannot rendered my map anymore. Following error notification is shown: at java.util.ArrayList.rangeCheck(ArrayList.java:657) at java.util.ArrayList.get(...
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1answer
71 views

Error in Geotools renderer

Here is my Java code that generates an error from Geotools renderer: public class LandmarkLayer { protected static final String LANDMARK_FEATURE_NAME = "landmark"; protected static final StyleFactory ...
2
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1answer
98 views

Getting “value”, “color”, “label” from existing palette raster layer in PyQGIS?

renderer = activaterlayer.renderer() symboloyitems = renderer.legendSymbologyItems() label = symboloyitems[i][0] color = symboloyitems[i][1].getRgb() value = ? How can I get the ...
2
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1answer
106 views

pyqgis: how to get the existing Paletted Raster Layers' color

rasterlayer = QgsRasterLayer(infilename, layername) renderer = rasterlayer.renderer() rasterlayer is the active layer with renderer type is Palette, I want to get current Palette Color, how could I ...
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1answer
651 views

Configuring mod_tile and renderd for memcache

I have my mod_tile.config set up like this # This is the Apache server configuration file for providing OSM tile support # through mod_tile LoadModule tile_module modules/mod_tile.so <...
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1answer
236 views

Does render caching in QGIS save permanently or is it only temporary?

I know there are a few questions similar to this on the forum such as: Is the QGIS cache directory automatically created? and Can QGIS cache a PostGIS layer for faster rendering? but I am still ...
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1answer
370 views

Serving OSM tiles - mod_tile/renderd/postgresql problem: I sometimes get 404 Not Found

When I request tiles I get sometimes 404 Not Found. Usually, if I request the same tile again it appears alright (with 200 OK). This is what I found in renderd logs: renderd[734]: An error occurred ...
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3answers
2k views

XYZ Tiles not rendering

I’m working with a fresh install of QGIS 3.0.3 on Ubuntu 18.04 and am not able to get my XYZ Tiles to render. When I add an XYZ Tile to the Map View it doesn’t appear. When I look at the XYZ Tile ...
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1answer
272 views

ArcGIS Javascript API - Update Renderer when a Feature Layer record is selected

I'm using ArcGIS JavaScript API to display a map with a feature layer with multiple records. I wrote code to display a pop up when a record is selected on the map. Is it possible to change the color ...
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1answer
317 views

OpenLayers rendering Geometry to Canvas

I saw an example of "Render geometries to a canvas": var canvas = document.getElementById('canvas'); var vectorContext = ol.render.toContext(canvas.getContext('2d'), {size: [100, 100]}); var ...
19
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1answer
847 views

QGIS 3.0 point cluster renderer, is it possible to control rendering order (z-order)?

I've been having a play with the new point cluster renderer in QGIS 3.0.2 and it's great - a lot easier (and faster) than having to do the clustering yourself. To show what I mean, here's an example ...
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0answers
54 views

Creating web map with dynamically rendered symbols for multiple large datasets with ArcGIS?

I am editing an existing ArcGIS Server (v10.2) / Javascript (3x) map-based web app, which has several dynamic map services, some of which contain over 50,000 points. The new web app must be able to ...
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1answer
538 views

Clipping TileLayer with vector polygon (clipping mask)

I would like to add a mask to clip layer (Tile) in a way that only the part bounded by a ol.Feature (polygon or multipolygon or layer) is visible and the rest is hidden (left transparent). The ...