Questions tagged [vector]
A coordinate-based data model that represents geographic features as points, lines, and polygons.
1,590
questions
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5 views
ArcGIS Pro pixellates vector marker symbol when published as web feature layer
I've added multiple SVG images to a feature layer as custom symbols in ArcGIS Pro. While these show up exactly as expected in ArcGIS Pro, the same symbols appear pixellated once the feature layer is ...
2
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0answers
19 views
Is there a way to join specific features of 2 seperate line layers into 1 new layer?
Specifically, I am looking to put speed limits (which currently reside in my road network layer), into my bus route layer (which follows some of the same roads, but not all within the road network). ...
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0answers
38 views
Compare two shapefiles by location and attribute in QGIS
I am looking for a way to compare two shape layers automatically. We have two files that represent two different states of our project and thus contain similar data in the same format (e.g. both point ...
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0answers
52 views
ogr2ogr TopologyException invalid input geometry; ring self-intersection
I'm facing a problem when using osgeo/gdal:ubuntu-small-3.2.1 docker image and running these commands on the Natural Earth vector dataset:
# Get and unzip the data
# (inspired from https://github.com/...
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2answers
39 views
How do I add my .shp file as a Vector layer in QGIS?
I'm working in QGIS 3.12 and my university as given us zip files of "data" for each practical we do. I've unzipped it and followed steps of adding a vector layer and navigating to the right ...
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1answer
34 views
How to merge polygons from two different features without creating a hole in QGIS?
How is it possible to merge the yellow polygon with the blue polygon without creating a hole and keeping the big yellow polygon intact. Each time I try to delete the small yellow polygon, the whole ...
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1answer
31 views
Draw an envelope for only selected features in many/Batch layers in QGIS
I have about 1000 layers, I did select by attributes Batch files and select by one step features I need in all 1000 layers. Now I need to draw the envelope for those selected features in all 1000 ...
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1answer
37 views
Calculating polygon area within polygon using ArcGIS Pro
I have a soil layer overlaying a watershed layer in ArcGIS Pro.
How do I calculate the different types of soil area within the watershed?
I have tried summarized within, but it does not work.
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2answers
50 views
QGIS: multiplying of symbology transparency
In order to export partly transparent symbology to PDF in QGIS as vectors, the symbology itself needs to have transparency ā if the whole layer is sat to be transparent, the symbology gets rasterized.
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2answers
133 views
Select circular polygons in QGIS
I have a multipolygon layer, in which some geometries are circles, drawn in an unknown GIS. How can I select only those features which are circular? A quick manual check confirms that circular ...
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38 views
QGIS Raster file not matching with vector data when I match their Coordinate referencing systems
I'm still quite new to GIS. I am trying to sync the CRS of some vector data I retrieved in the field with some raster Digital Elevation Models I have downloaded. The vector data is a gpx. file ...
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1answer
85 views
Is topology stored explicitely in vector layers or is it derived from stored geometry information?
In vector layers, different types of information are stored like:
Geoemtry
Attribute data
Meta data (like filename, projection etc.)
Spatial indices
However, what about topology? Is it an explicit ...
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0answers
23 views
Open Source Desktop Tool to Style MapBox Vector Tile Data for MapBox
I have MapBox Vector Tile data in the form of mbtile files that needs to be styled for MapBox. Need a desktop application to work with data locally that will allow the style to be saved locally as ...
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1answer
40 views
Select points outside of polygon in Google Earth Engine
I understand how to get the points that fall inside a polygon with GEE:
// Load a feature collection and a area of interest
var dataset1 = ee.FeatureCollection("link/to/any/point/dataset/on/gee&...
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0answers
13 views
T-rex basemap style
I've figured out how to display a tile using T-rex, only problem i don't have any basemap is it normal ? Do i need to load another table ? I took my data form geofrabrik as an .pbf file. I have used ...
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20 views
QGIS georeference a Mesh layer with wind vectors?
I have an .nc file with u and v components to create a map of wind speed and direction. When I add the layer as a mesh in QGIS, I am able to get the arrow vectors correctly (image below), however, the ...
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0answers
15 views
Tippecanoe vector tiles duplicating over certain graticules (equator, -90)
I have large geojsons at different scales that I have converted to tiles with tippecanoe. My ultimate goal is for a user to be able to draw a box around the tiles and calculate mean attribute values ...
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21 views
Creating polygon of difference using ArcMap
I have two polygon layers, each describing the Geomorphic units (GU) within a river channel across two surveys.
Using ArcMap (10.7.1), I would like to create a new layer, illustrating the change in ...
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24 views
Using a feature in a function in OpenLayers
I want to use in the get_pdf_data function the data loaded in the "imobile" vector so that I can perform operations with the "imobile" vector.
The code I'm trying to do this with ...
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1answer
26 views
Massachusetts Woodland Shapefile / GDB Not Rendering Correctly QGIS
I am working on a personal project that utilizes USGS Land Cover Woodland data sets and I seem to have an issue in QGIS where part of the state of Massachusetts is missing / not rendering correctly. ...
0
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1answer
26 views
Snap to disabled layers problem - QGIS [closed]
I'm having some trouble with QGIS because when I try to edit a vector, it displays the edges in that point of all the layers loaded in the drawing even though they are off, making it almost impossible ...
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0answers
23 views
Why is points to path tool connecting the start and ending points?
The PointsToPath tool is connecting the start point to the end point. I'm new to QGIS. I'm using an older version - 3.4.5. I have manually entered in the points in as a scratch layer. I export as a ...
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1answer
34 views
Changing default settings for the Save Vector Layer as… dialogue box - QGIS
I would like to change the defaults selected in the Save Vector Layer as... dialogue box. I use export to kml and Shapefile daily and would like it to default to the settings I use, rather than ...
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2answers
22 views
GRASS - r.mask analogous for vectos
I am working with r.stats. My analysis is about overlap Extreme Climatic Events (ECE) raster map with mammals range maps. I used to do my analysis first creating r.mask on ECE map and then applying r....
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1answer
39 views
Shapefile partly hidden in QGIS but fully visible in Geosecma
I'm working in QGIS Hannover and have added some vector shapefiles to my project. Some of the data in the files won't show up in the viewport, leaving "holes" in the map. The same file ...
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0answers
20 views
Export vector file in DXF
I used QGIS a lot last year for Dutch cadastral maps purposes. Since December 2020 I notice something has changed when I export maps to dxf. Exports have always been as Vectorfile. Lately they become ...
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1answer
35 views
Landscape change metrics for vector data
I am new to GIS.
I am currently working on a problem which involves two vector datasets about habitat and land use ("now" and "future"). I need to generate metrics like "...
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0answers
64 views
Creating python function to merge line segments if they are connected using ArcPy
I have a polyline shapefile consisting of several line segment features. I want to do a merge operation if the line segment features endpoints are connected, and if the features are disconnected do ...
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0answers
37 views
PostGIS difference between polygons - Ring Self-intersection?
I want to take ST_Difference or ST_Intersection to take the difference between two polygons.
SELECT a.id, a.geom, st_difference(a.geom, b.geom)
FROM liechtenstein.flaechen_norden a, liechtenstein....
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0answers
46 views
QGIS 3.16.3 uses Python 3.7.7 while I want it to use Python 3.9.1 already on my MacOS Big Sur
MacOS: Big Sur 11.1
QGIS: 3.16.3
KyngChaos said that QGIS 3.16 is using Python 3.9.X (strictly) and I installed this in my system, however the Python bundled with QGIS is 3.7.7. It is strange that ...
6
votes
1answer
74 views
How to use FactoQGIS for Typological Analysis Principal Components Analysis (PCA) for vector features in QGIS?
How to use FactoQGIS for Typological Analysis Principal Components Analysis (PCA) for vector features in QGIS?
I have a shapefile of polygons as in the following image:
Both visually and as ...
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1answer
79 views
How to draw centerlines of Oriented Minimum Bounding Box in the orientation closest to orientation of all polygons collectively in QGIS? [duplicate]
How to draw centerlines of Oriented Minimum Bounding Box in the orientation closest to overall orientation of all polygons collectively in the layer in QGIS?
I have a shapefile of Oriented Minimum ...
4
votes
1answer
131 views
Calculating dominant angle of a polygon in QGIS without main_angle function
How can I calculate dominant angle of a polygon in QGIS without main_angle function?
I have a shapefile of Oriented Minimum Bounding Box rectangles (accessible from the following link: https://drive....
1
vote
1answer
17 views
Topography - represent result in WKT as polygons with rings or multipolygon without rings?
I'm new to GIS vector, especially for GIS tools like ArcGIS, QGIS,...
My question is, for this image below with poylgon 1 and polygon 2, typically how a WKT (Well-known text) is represented in GIS ...
0
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1answer
42 views
Changing symbology from simple marker into a vector (print of a building)
I've got a question about changing the symbology of a certain rule-based layer. See below as to the current simple marker:
As you can see the house is given this grey color because of the added 'topo'...
5
votes
3answers
199 views
Calculating buffer distance for different groups of parallel lines in QGIS
I have a number of parallel lines (see here for the background: How to extend lines to Bounding Box in QGIS?). My final aim is to create the Centerline for each group of lines as illustrated here:
...
4
votes
2answers
135 views
Extending lines to their Bounding Box in QGIS
How to extend lines to Bounding Box in QGIS as in the following image:
Figure 1: Lines
Figure 2: Lines extended to Bounding Box
Link to Shapefile of Bounding Box: https://drive.google.com/drive/...
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0answers
49 views
How to get centerline of each polygon (rectangles) in QGIS [duplicate]
How to get centerline of each polygon (rectangles) as in Figure 1 in QGIS to obtain centerlines as in Figure 2
Figure 1
Figure 2
4
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0answers
24 views
Batch create multiple buffers with variable size around point
For a statistical analysis, I need to calculate some landscape properties in several (rectangular) sample areas, which vary in size (extent ranging from 10 by 10 to 500 by 500). These sample areas are ...
4
votes
2answers
114 views
Renaming multiple layers in the legend from an attribute in each layer in QGIS
I have 72 layers that have been generated via affine transform of a single layer that has 72 categories. But the 72 layers have been given names that are sequential numeric. The original categories ...
3
votes
0answers
29 views
Align arrow (point layer) to water direction (line feature)
Assuming that pipes are digitizet correctly (first node as upstream, last as downstream), I need to align the arrows of a point layer to display flowmeter's direction. So far I need to use v.split (...
4
votes
1answer
57 views
What has happened to my landcover data?
I have downloaded Great Britain vector landcover data from Digimap. I was expecting it to look like the image on the left, however, when I downloaded it to ArcGIS Desktop it only displayed 1 colour (...
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0answers
144 views
QGIS 3.16.1: Clip by mask layer not working in macOS Big SUR
I am having an issue with clipping my raster as per the vector mask layer. I did try to counter the issue with projecting both files in same CRS, however, still getting the same error (ERROR 1: ...
2
votes
0answers
65 views
Doing TIN Interpolation in QGIS
I want to do TIN Interpolation on a layer but when I fill all the fields with the right data (vector layer, interpolation attribute, extent etc) the algorithm does not run and shows me this message:
...
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0answers
45 views
Vector length attribute not the same after convert to raster in QGIS
In QGIS I've successfully used GRASS v.to.rast to convert a SHP file to a raster and then raster>conversion>BMP. My output looks great.
The raster info says it is w = 3070, h = 8727. Unit is ...
4
votes
1answer
48 views
Selecting by attributes on features sharing common value
I have a point vector with features sharing non-unique "ID"s. Each feature also has a "distance" field. I want to select among each set of features sharing the same "ID" ...
0
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1answer
48 views
Importing vector data into Earth Engine via asset manager
I am trying to import the shapefile of my country into the Earth Engine asset manager in order to perform some analysis, but I keep getting the error message below on every attempt after the task runs ...
7
votes
2answers
146 views
Select the holes in a vector shapefile in QGIS
Is there a way to select the holes (gaps) in a vector shapefile in QGIS, like the "fill holes" function which recognizes them indirectly?
I need to get the holes from the original shapefile ...
2
votes
1answer
71 views
OpenLayers: exporting vector map to PDF
Our application uses OpenLayers+PostGIS to visualize and process millions of spatial data files (GeoJSON).
We have a requirement to be able to export the processed final data as PDF/GeoPDF Vector maps....
0
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1answer
19 views
Adding column to attribute table indicating polygon each data point is in using ArcGIS Pro
I am working on a project linking ideas in Geology and Ecology.
I currently have a map showing the geology of an area (polygon layer), with a points layer on top indicating the locations of data ...
