Questions tagged [rendering]

The process of generating an image from a model.

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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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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 ...
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-1 votes
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33 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 ...
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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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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 ...
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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 ...
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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). I don't ...
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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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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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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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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 ...
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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 ...
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1 answer
92 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 ...
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2 votes
1 answer
74 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: ...
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5 votes
1 answer
86 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 ...
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2 votes
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42 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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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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1 answer
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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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2 answers
243 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 ...
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1 vote
1 answer
219 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 ...
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8 votes
1 answer
128 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 ...
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49 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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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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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
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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
91 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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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
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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
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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
64 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
76 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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0 votes
1 answer
37 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
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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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1 vote
1 answer
494 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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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
140 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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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
643 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
167 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
31 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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3 votes
1 answer
235 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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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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1 vote
1 answer
127 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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0 answers
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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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2 votes
0 answers
157 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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1 answer
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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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2 answers
406 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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  • 477
1 vote
1 answer
175 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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1 vote
0 answers
59 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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