Questions tagged [vector]
A coordinate-based data model that represents geographic features as points, lines, and polygons.
0
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0answers
7 views
average weighted value by region with use of Voronoi in Qgis
I have a vector layer of Voronoi polygons. This layer has three columns -longitude, latitude, Z-value.
I need to cut polygons by mask of administrative area and then I need to calculate average-...
0
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0answers
11 views
Export vector graphic from ArcGIS？DPI setting？
When I plot the map in ArcGIS, I wish to export it to the vector figure. And the file is shapefile, no raster files loaded. However, when I try to export the Map. The setting from the window ask me to ...
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0answers
11 views
Get visible polygon form one point (visibility graph with one point)
Problem
I would like to get the visibility of one point in regard to a polygon layer. E.g. which island can I see from the beach.
What I found
It's possible to get a visibility graph via Grass v....
0
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0answers
17 views
Error in reproject vector file using GeoPandas
I have a vector file (in this case shp file) and I read it with GeoPandas (gpd).
vector_folder = r'C:\poly'
vector_file = 'poly.shp'
df = gpd.read_file(os.path.join(vector_folder,vector_file))
df
...
0
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0answers
15 views
Velocities along X Y Z directions for GNSS if Speed is given [on hold]
The Speed at each GNSS location is given alongside the location coordinates.
How can the velocities be calculated along X, Y & Z directions at each individual GNSS location?
-1
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0answers
24 views
GIS/Open Data Sources for SE Asia?
I am looking for city and neighboorhood level (and other administrative divisions) vector data for countries in SE Asia a. It must be free to access and use. Trusted/official data is preferred (i.e. ...
1
vote
2answers
44 views
Calculate the percentage of a Line passing through Polygons
I have a polygon layer of a region (100% coverage, no overlaps) and a line layer in the same region.
I want to calculate for each line to which percentage it crosses certain polygons.
I have seen ...
-2
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0answers
28 views
Clipping raster to vector polygon
I have a raster file containing landcover classes of the UK.
When I clip it to my Derbyshire Dales vector file it comes out as just a black screen with values of 0 and I can no longer see all the ...
-2
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0answers
43 views
A new GIS rollout, what vector data format would you use? [closed]
I am going to be involved in rolling out a new GIS system across an organisation that uses a variety of different GIS formats, DWG, Shapefile etc.
They are moving to an ESRI stack and I am ...
1
vote
1answer
58 views
Creating new lines based on another line feature and point feature using QGIS?
I have line layer (roads) and point layer (milestones) and I need to create a new line layer based on roads layer, where the start and the end points will be milestone points.
Can you advise me some ...
1
vote
1answer
44 views
QGIS 3.6: Vector “Polygons to Lines” missing
I use the tool Vector-->Geometry Tools-->Polygons to Lines all the time. It is in the menu up until 3.4. In 3.6, that menu item is no longer available. Where did it go? Is there another way to do ...
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3answers
51 views
Calculating the shortest distance coordinate to vector layer
I want to calculate the nearest distance from each coordinate in a vector layer containing more than 17 000 coordinates to another vector layer. I tried the GRASS v.distance tool but it gives the ...
2
votes
1answer
58 views
QGIS split vector layer gives me GPKG files but I need shp files
QGIS 3.6.0
I am new to QGIS software and not very technical on its deep workings. I am trying to split a .shp file using split vector layer. I need .shp file outputs but it auto creates .gpkg files.
...
1
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0answers
45 views
Does any version of QGIS support GDB 10.5?
Does any version of QGIS support GDB 10.5? I have a GDB 10.5 file that I need to open in QGIS and I can't. I'm using QGIS 3.6.
The file is named Virginia_Parcel_Dataset_2018Q4.gdb -- it can be ...
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0answers
19 views
ArcGIS: Train Support Vector Machine Classifier on a Segmented Raster
I have a raster (.jpg) which I have segmented utilising Segment Mean Shift to smooth out JPEG artefact (aim is to classify it as accurately as possible for conversion into vectors).
START .JPG
Input ...
0
votes
1answer
17 views
How can I keep the minimum when converting from shapefile to raster
I have a shapefile that I am trying to convert to raster. The shapefile has overlapping polygons. I would like to keep the minumum value of these overlapping polygons when converting to raster.
...
1
vote
1answer
56 views
How to make a rectangle of an exact size/aspect ratio in QGIS?
Is there any way in QGIS to make a vector layer with a rectangle of an exact size or aspect ratio? Ideally, it would be nice if the rectangle from extent tool could be limited to a set aspect ratio, ...
1
vote
0answers
29 views
Vector Rasterize Error
I am running QGIS 3.4.4 With GRASS 7.4.4 and I get an error while rasterizing a vector layer and I don't know why.
The same error pops up while using GDAL->Rasterize(vector to raster) and while using ...
2
votes
1answer
50 views
Translating vector by raster DEM data in QGIS?
I'm trying to follow the set of instructions here: https://twitter.com/imhere_asia/status/1023055838787690496
[EDIT]
Pasting the instructions here for reference so people can avoid twitter.
...
0
votes
0answers
18 views
Prevent Export/Save As of Vector Layers/Shapefiles
I have created a database using postgreSQL and created multiple users assigned with different roles
Some of the users can only select and view the data and not update or delete any record. It works ...
3
votes
1answer
75 views
Exporting crown boundaries from tree segmentation in R?
I am using lidR package to segment my trees using lastrees directly from the points clouds.
The function works fine, however I would like to export to vector file the canopy boundaries from ...
0
votes
1answer
56 views
How to batch geocode country names to polygons? [closed]
I have .xlsx dataset file with column "Country Name" and "Country Code" which have text records. I would like to geocode (assign) it to adequate country polygon in batch mode. The expected result ...
1
vote
1answer
31 views
QGIS3 How to export shapefile symbology to scale?
I'm looking how to export in QGIS3 a vector layer with a determined scale.
It was straightforward in QGIS2 when I was exporting to a shapefile I had the option symbology scale but it disapear in QGIS3 ...
8
votes
2answers
179 views
Create line segments at point coordinates in QGIS
I have a point vector layer with angle field. How can I create line segments at these points with certain length and angle?
I did this with style options but I need this physically as lines vector ...
1
vote
0answers
26 views
Vector to grid - Computing statistics by grid cells
I have a vector point data from drifting buoys (speed, direction, sst, slp) that I want to analyse in a grid. What are the right tools for this?
Example of my points data below. Each point has the ...
0
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0answers
26 views
QGIS Display Attributes as Z Value for Point Shapefile?
I would like to create a state map that displays a 3D bar chart for each of 20 colleges (mapped as points) showing the percent share of engineering degrees earned by award level (i.e., assoc, ...
1
vote
0answers
57 views
Modifying style (line width/color) of vector layer in PyQGIS?
I'm currently updating some python code from QGIS 2.18 to QGIS 3.4
in 2.18 i used the following code :
#First off I created a virtual layer using an sql query here
vlayer = QgsVectorLayer( "?query=....
0
votes
0answers
21 views
Is there a Python script or geoprocessing tool that takes a folder of PBF Vector Tiles (TMS or XYZ Tiling Scheme) to VTPK (ESRI Vector Tile Package)
I'm trying to convert a folder of OSM PBF Vector Tiles to Esri's Vector Tile Package format (VTPK) for publishing in ESRI ArcGIS Enterprise.
Building/generating vector tiles with ArcGIS Pro is too ...
0
votes
1answer
17 views
How to prevent labels from a vector file to overlap the raster file?
I have vector file of say Sewer lines with diameter as their labels. Against some of the sewer, georef. images are placed. While displaying all together, line labels do appear over the raster file.
I ...
0
votes
1answer
52 views
How to properly import corine landcover 2012 (vector file) in QGIS?
I'm fairly new to QGIS (using version 2.18.25), so I may be missing something quite basic. I'm using the Corine landcover (clc12_Version_18_5.gdb) in my project. It's a very large dataset (3GB) so it ...
1
vote
1answer
102 views
Reclassifying shapefile using ArcGIS Desktop?
So I have a shapefile consisting of 1000 polygon records. I would want to reclassify one field "Value" into a new blank field named "New Value". As an example:
record = 1; value = 25.6
record = 2; ...
0
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0answers
17 views
ERROR in R - it cannot support the vector
I did use the function crop and mean for 434 rasters in Rstudio. Each one is very big, it corresponds almost like 1/4 of Brazil.
Now I want to calculate the standard deviation between these 434 ...
0
votes
1answer
28 views
Exporting vector from raster classification gives deformed vector in Google Earth Engine?
I am very new with Google Earth Engine and I try to make a landcover classification using Sentinel-2 imagery to get the urban area over a very large area (country wide ideally).
I was able to ...
0
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3answers
51 views
QGIS: Intersect rasterdata with vectorline
I am new to QGIS.
My aim is to be able to get information of the height at any point on my vector line. My raster is a map with height information in the format geotiff. The vector layer is in the ...
0
votes
0answers
16 views
Calculate average slope values for a point using 50ft vector perpendicular to contour
I am trying to calculate the average percent slope of a hillside on either site of a data point. I tried extracting info from a DEM using a radius around the point, but I believe a more accurate ...
3
votes
1answer
106 views
Rasterize (vector to raster) QGIS 3.4
I am trying to rasterize a vector with the QGIS 3.4 rasterize tool (not saga or grass tools). I prefer using this tool cause it is much faster. The values which i would like to burn are found in the "...
2
votes
1answer
49 views
How to connect polygons to make a circle?
I created polygons from a raster on which I ran an edge detection filter. I turned the edges into a polygon layer (multipart splitted into single parts). The intention was to have circular polygons at ...
0
votes
2answers
118 views
QGIS: Getting Concurrent mapset locking error using V.transform
Using QGIS 3.4.3 I'm trying to carry out a simple v.transform task shifting x and y
But I'm receiving the following errors - and output shapefile is empty.
Processing algorithm… Algorithm 'v....
1
vote
1answer
65 views
Vector layer does not appear with OpenLayers
When I import the vector it simply does not show in the map. I tried with a raster and it worked fine. I tried now with both KML and GeoJSON and the same thing happen, I can see that it loaded in the ...
0
votes
1answer
39 views
How to make layer stacking in envi for landsat 8
I downloaded landsat image 8 and i made layer stacking for RGB layers in ENVI (Bands 4,3,2) to classify the land cover types. but the problem appeared when i conducted supervised classification.
I ...
1
vote
1answer
42 views
How can I export selected features in Processing Modeler?
This question is a follow up from a suggestion from this thread:
How to export a single feature (line) from multiple layers and export to individual layers?
I'm creating a batch process that selects ...
2
votes
0answers
32 views
How to export a single feature (line) from multiple layers and export to individual layers?
I have multiple vector layers representing a time series. Each layer contains many lines each. I want to select a single specific line from each of these these layers and save it to another layer. ...
1
vote
1answer
59 views
Vector difference between two polygon layers by attribute
Is there a way to do a 1:1 difference between two polygon layers based on a similar attribute? The layers have the same number of features with a shared attribute. I've tried the native QGIS ...
2
votes
2answers
83 views
What is the proper name for the “Venn diagram” of a set of geometries?
Sometimes, you have a set of overlapping geometries, and you want to generate an output like this:
Image taken from this answer.
The resulting polygons have no overlaps; each region of space is ...
1
vote
0answers
41 views
Raster values shows no data when using identify features tool
I used vector to raster function in QGIS, to convert some points with different values to raster. I tried to use the "Identify Features" to check values for each raster box. The values shows no data ...
1
vote
0answers
15 views
Deleting vector layer within buffer? [closed]
I am trying to delete points from a shapefile with vector information that intersect a buffer that was created. I have tried using the intersect tool, but that only highlights the information that ...
1
vote
0answers
44 views
QGIS fails to generate requested number of random points
Does anyone have any ideas what might be blocking this process? The layer has thousands of polygons totalling hundreds of thousands of square metres, but when asked to locate 140 random points even ...
3
votes
1answer
380 views
TypeError: “unsupported operand type(s) for /: 'int' and 'list'” in QGIS?
In a academic project I've produced a small python script for watershed analysis. This script relates shapefiles attributes and generates a .txt file.
I am trying to adjust the script to use within ...
1
vote
0answers
40 views
How can I calculate the “average” or “median” result between a number of MultiLine Strings?
So I have a number (let's say 12) of multiline strings representing something that changes over time, like forest borders or shorelines. I want to create a single line that is the result of the ...
0
votes
0answers
21 views
Save each record in a shapefile to a new shapefile or KML [duplicate]
I have created a shapefile of 13 polygons. Each polygon is a single-part feature. I want to create 13 new shapefiles where each each shapefile represents each record in the attribute table. I know ...
