Stu Smith
  • Member for 9 years, 2 months
  • Last seen this week
OpenLayers low resolution and/or shifts in QGIS print composer?
14 votes

For future readers who are viewing this post, this bug still exists at 2.12. Here's a visual example of the bug, screenshot from a pdf that I created using the Print Composer. All layers, as well as ...

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QGIS low CPU usage why?
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8 votes

A 100% usage display would imply that all CPU cores were being simultaneously fully utilized, no matter how many physical cores the CPU contained (2, 4, 8...). But many software applications are only ...

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Calculating percentage of overlap of two layers in QGIS 3
8 votes

Welcome to GIS SE, JS5687! If, like me, you are unfamiliar with coding - such as the answer provided by @Taras - here's an old-school GIS analysis process. For my example, I have two layers named ...

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QGIS 3.6.1 problems with CRS
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8 votes

Following on Ian Turton's comment... Prior to performing ANY geometry calculations or analysis on a layer(s), the layer(s) MUST be 1) projected to the desired CRS, and 2) that CRS must be the same for ...

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How to determine the centroid of polygons?
8 votes

I just came across this post nearly 5 years late (!), but here's what I do to calculate polygon centroids at version 2.18.14: Begin editing the polygon layer Create a new text field, call it ...

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Create line from points while keeping attribute information
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7 votes

Matthew, there's a terrific QGIS plugin that does exactly what you want. I've used it successfully for some time. It's called Points to Paths (note the plural Paths), EDIT: *Points to Paths* has ...

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Can I export QGIS tool results to anything other than a shapefile or DBF?
7 votes

QGIS can read and write to File Geodatabases. Reading FGDBs is achieved with the default QGIS install (and has been for several years). Writing to a FGDB requires an OSGeo4W64 install and selecting ...

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Keeping symbology for intersection in QGIS
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6 votes

Open the source point shapefile's Layer Properties. In the lower-left corner click the Style dropdown (image below) and select Save Style. Then from the intersected layer, Load Style, and select the ...

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Making square with determined length of sides
6 votes

Here's a way to do it without any digitizing or coding. I used 3.18.1: Start with a point layer. Below, I have a layer containing three points, located within Washington state, USA. The CRS is ...

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QGIS: extract point features not in polygons
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6 votes

The tool you are looking for is Processing > Toolbox > Vector selection > Extract by Location, using the Disjoint option: The Help page describes the tool quite well.

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QGIS slope output problems
5 votes

The herringbone pattern in your image is a classic indication that a Nearest Neighbor resampling occurred somewhere in your workflow. I suggest that you go back through each processing step and ...

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Getting image pop ups in QGIS
5 votes

At 3.8.0, here's what works for me: Create a point layer (Geopackage, shape file, etc) Create a text attribute field in the point layer: call it, say, image_path A reasonable maximum length is 320 ...

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Increasing spatial resolution of Landsat MSS and TM images?
5 votes

You can resample the 60- and 30-meter rasters, outputting them to 15 meter pixel size to match the 15-meter rasters (don't forget to snap all of the rasters together!). However, such resampling won't ...

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Allocating point attributes as default values for line layer
4 votes

[EDIT: Points to Paths has been updated, and is now available at 3.x]. I keep a copy of QGIS 2.18 to solve problems just like yours. Use the tool Points to Paths (note the plural Paths), which, sadly, ...

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Accessing raster attribute table in QGIS?
4 votes

Good news! A Raster Attribute Table plugin (experimental) is now available. There's also a Youtube video introduction at https://www.youtube.com/watch?v=nARp6yxRt68

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Intersecting area between two polygons in the same shapefile in QGIS
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4 votes

Make a temporary copy of the Input layer by right-clicking it and select Duplicate Layer Select one of the Duplicate layer's polygons Select the other polygon in the Input layer Clip, using the ...

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Difference between Feature Server and Map Server?
4 votes

As a user, here's how I see the differences between Feature Services and Map Services: When I connect to a Feature Service, the resulting vector data that appears on my computer screen (via "the ...

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Select point by number of overlapping features
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4 votes

Going by your last sentence, here is how I would identify "... three or more overlapping points": Start editing your point layer's attribute table and create a new text field, 50 characters long. ...

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Getting tabular statistics from table using QGIS?
4 votes

Years later, I had the same question with QGIS 2.18.16, and I came across this thread. The QGIS alternative to the Arc Frequency tool is: Toolbox > QGIS Geoalgorithms > Vector table tools > ...

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How do GPS/Glonass/Galileo satellite know their position?
4 votes

I recently came across an article in GPS World stating that some of the more recent vehicles launched into space had small special mirrors attached to the satellite's exterior. Repeated laser beams ...

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How to add USGS DRG WMS to QGIS?
4 votes

I just had the same question and I've found the answer: http://www.northrivergeographic.com/qgiswms Note that the author made an error, by pointing to the line "Contours - Small Scale". This is ...

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Extract date, time and GPS position linked to road crossing
3 votes

EDIT: The PointstoPaths plugin (described below) is now available at QGIS 3.x Reuben, good day to you. I have solved problems like yours with the QGIS tool PointstoPaths (note the plural Paths). ...

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Opening .tif drone photo in QGIS problem
3 votes

Welcome to SE GIS! It appears that your .tif is a multiband image (confirm by reviewing your .tif's Layer Properties). I can recreate your problem with a sample multiband image, as follows. Using ...

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Intersect two polygons but preserving the shape of one
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3 votes

Your question is a classic example of "Select by Location"! To use it: Vector > Research Tools > Select by Location, where: - *Select features from* = Land Titles layer - *Where the ...

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Water color significantly different from different relative orbits?
3 votes

In addition to sun glint, the "roughness" of the water's surface, as affected by prevailing winds, can alter the reflected light. Imagine the difference in a body of water between a glassy-...

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Compare two shapefiles by location and attribute in QGIS
Accepted answer
3 votes

QGIS has the Processing Toolbox > Vector General > Detect Dataset Changes tool that will detect both spatial and tabular differences. This tool is available at version 3.16.3, possibly earlier.

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Analysing differences between 2 dataset versions
3 votes

You don't say what GIS software your department uses, so I'll respond with answers for both QGIS and ArcMap. QGIS at 3.16.1 has a tool, Detect Dataset Changes, which I have use with great success. ...

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Road density calculation
3 votes

Assuming that the polygon and road layers cover the same extent, and are projected to the same Coordinate Reference System (that uses feet or meters as the unit of measure), no overlay operation, such ...

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Understanding DEM of difference results in ArcGIS Pro
3 votes

Millimeters are a good guess, but to be sure, open up both of the DTM properties and examine the results. Within the properties section, you'll see the units (meters, feet, mm, furlongs, etc) that ...

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Select By location QGIS 3.12 Not Selecting all Features within
3 votes

When I'm faced with situations such as yours, I first check my data. I would start with the following checks: Both layers, red and black must be in the same coordinate reference system. Confirm the ...

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