Questions tagged [rendering]

The process of generating an image from a model.

Filter by
Sorted by
Tagged with
2
votes
1answer
33 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 ...
1
vote
0answers
21 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
vote
1answer
32 views

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

I am using hook React My question is 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(); ...
2
votes
0answers
20 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 ...
1
vote
2answers
46 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 ...
0
votes
1answer
47 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I searched this issue in other topics but only found outdated topics with previous versions of Ubuntu.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
vote
1answer
65 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 ...
0
votes
1answer
39 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 ...
0
votes
0answers
56 views

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) ...
1
vote
0answers
15 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
votes
1answer
44 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
votes
2answers
51 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, ...
1
vote
0answers
58 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 ...
1
vote
1answer
38 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 ...
1
vote
1answer
31 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 ...
1
vote
0answers
27 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 ...
2
votes
1answer
151 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 > ...
1
vote
2answers
79 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 ...
1
vote
1answer
27 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 ...
1
vote
1answer
40 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({ ...
1
vote
1answer
49 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 ...
1
vote
0answers
61 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 ...
0
votes
2answers
95 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 ...
0
votes
0answers
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 ...
1
vote
0answers
18 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....
1
vote
0answers
71 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/...
0
votes
0answers
65 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 ...
2
votes
1answer
52 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 ...
1
vote
1answer
178 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 ...
1
vote
0answers
44 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" ...
1
vote
1answer
88 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 ...
0
votes
0answers
40 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 ...
2
votes
0answers
60 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. ...
0
votes
2answers
42 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 ...
2
votes
0answers
173 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 ...
1
vote
1answer
52 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 ...
-1
votes
1answer
50 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: <?...
2
votes
1answer
96 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 ...
0
votes
2answers
141 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, ...
1
vote
0answers
68 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 ...
0
votes
2answers
552 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 ...
1
vote
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
votes
1answer
221 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 ...
1
vote
0answers
237 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, ...
0
votes
0answers
64 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(...
0
votes
1answer
81 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
votes
1answer
110 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
votes
1answer
131 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 ...
1
vote
1answer
759 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 <...
4
votes
1answer
262 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 ...