Questions tagged [speed]

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How to speed up the intersection of two large shapefiles in R with sf (or any other way)

I have two large-ish shapefiles. Shapefile 1: One can be downloaded from here: https://data.statistik.gv.at/data/OGDEXT_DSR_1_STATISTIK_AUSTRIA_20111031.zip It is ~20 MB in size Seems to be super ...
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QWC2 Problems with Performance [closed]

We have installed the QWC2 on a win server. The own geodata are in a PG database and the WMS for the QWC2 is generated by QGis-Server. So far everything works, but we have significant performance ...
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  • 11
2 votes
1 answer
77 views

'Join Attribute by Location (Summary)' slows down with time

I'm attempting to perform a 'Join Attribute by Location (Summary)' between two polygon layers where I calculate the sum of a given field in the join layer using the 'Intersect' predicate. The process ...
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How to compute the speed of an area (raster data) [closed]

The raster data represent categorical zones (denoted by the colors). They moved over time. I would like to compute the speed of each zone between two time periods i.e, distance of zone pink between ...
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  • 39
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169 views

How to handle layer that contains millions of vertices in QGIS

I have a multi polygon layer with 25 features, each containing millions of vertices, holes, etc. It is a statewide floodplain. Right now, it takes forever to draw even when zoomed in, plus the ...
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4 votes
1 answer
736 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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  • 125
2 votes
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64 views

Difference in the shape of polygons

I created isochrones using Iso_area as polygons algorithm of QGIS. I created the green polygon feeding the algorithm with the speed field of the road network. Then I created the blue polygon using the ...
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  • 379
2 votes
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Getting results from internet speed test into survey123

I have a survey made in Survey123 Connect that lets people fill in some information. I would like them to run an internet speed test and then have those results (upload/download/jitter/ping/ip) ...
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1 answer
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Visualizing car speed data in ArcMap

I have gathered positional (Long and Lat) data and the corresponding speed of a vehicle over a specific route. I am able to plot the X-Y coordinates in ArcMap 10.7 over a basemap which essentially ...
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1 vote
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31 views

How to speed up a complex process of compositing multispectral images in python?

I would like to speed up my process. I have a one month time series which consists of 5 images (Sentinel-2) taken over several days. Each image is made up of the same bands that I selected. After ...
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1 vote
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Does GPS measure faster speed better or lower speed better? [closed]

Assuming the same signal condition (HDOP, SNR, or other environmental factors), does GPS measure faster speed better? or lower speed better? Note that the speed measurement here is derived from ...
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Speeding up GeoJSON data in Leaflet

I have a very large GeoJSON file and I would like to make it faster. How can I add in the filter a check to see if points are inside the map's view box, so only points in the current view are rendered?...
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136 views

How to calculate interpolated timestamps of linearly referenced points in ArcGIS?

I have a point feature class with timestamp attribute belongs to bus-gps smartcard data-set. I've used linear referencing tool to snap these points to a bus-route. So there are milepoints in the ...
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2 votes
0 answers
213 views

Creating flow velocity map in QGIS?

I want to make velocity map in this format. I have points with vector attributes (u, v and velocity), but my arrows have only heads!
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2 votes
1 answer
348 views

Using Live GPS in QGIS - Speed and quality is not shown

I am using QGIS 3.10 together with a ArdusimpleRTK2B Board based on U-Blox ZED F9P processor and a Windows 10 based tablet computer. Using a SAPOS correction service and having connected it via gpsd ...
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1 vote
2 answers
142 views

ArcPy Iterative Select by Location

I have a very large dataset with line features that represent a utility, and lines that come off of those utility lines showing connections to buildings. (example shown below - utility line in black ...
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  • 135
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Snap points to nearest polylines within buffer (fast)

This is a working version of snapping any point to nearest polyline within a buffer distance. But, this takes significantly longer as each time it copies the point to a different shape and snaps it. ...
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  • 755
8 votes
1 answer
308 views

Speeding up searches on layer with many attributes?

I'm using QGIS 3 with my data in a PostGIS server on the same local network. I want to quickly search for a feature based on a certain attribute or attributes of my layer. This layer has ±2 million ...
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