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Geographic Information Systems

Questions tagged [vector]

A coordinate-based data model that represents geographic features as points, lines, and polygons.

1,294 questions
info newest frequent votes active unanswered
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33 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
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0answers
41 views

Need guidance on programmatically creating color-coded maps ( choropleths ) with near-real-time data [on hold]

I know enough about tiles to know I don't know enough, so my questions are may seem vague. I'm looking for a push in the right direction. I know I want to create chropleths. I want to show them on ...
1
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0answers
13 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
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0answers
35 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 ...
1
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0answers
33 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
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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 ...
2
votes
1answer
50 views

Delete vertices from a line pyQGIS

I have a line made of 17959 nodes. I want to delete several range of nodes from that line with a python command. For example I want to delete all nodes between node 5530 to node 5861 and connect node ...
0
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1answer
45 views

Single Side Buffer pyQGIS

I am trying to create a single side distance buffer around a line on QGIS. Here is the code I am writing but I don't get the expected result: processing.runalg("qgis:fixeddistancebuffer","input.shp"...
0
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1answer
31 views

Two parallel lines (vectors), only one feature (ID) [closed]

I have one shapefile that contains two parallel lines in yellow in the picture. Both lines have the same feature (these lines were originally both sides of a fixed distance buffer around a line). I ...
0
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0answers
18 views

OGR Python: Copying features from one datasource to another works with shapefile but not with geopackage

I have a shp/dbf EPSG4674 input datasource, and I want to copy features from one layer of this input datasource, create a new output datasource and write these features to that output datasource. As ...
1
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1answer
33 views

Connect outline gaps at vector shape

Could someone shed some light into a method to link breaking outline borders without much distortion from the original like e.g. convex hull does? Convex hull alternative ideas are of course welcome ...
0
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1answer
39 views

How to calculate the area of several classes of a raster in a polygon of a vector file with QGIS?

I have some trouble with QGIS I have two layers of information: The first one a vector that contains 500 objects, with attributes such as number of population, and... A raster that has three classes:...
2
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1answer
38 views

Export shapefile to CSV files by a grid I drew in a image

The shapefile is in orange and I need to export them into (1.csv and 2.csv etc...) corresponding to each grid I drew in the map. Is there any way this can be done in a single process?
0
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1answer
38 views

How to convert vector format (geopackage, shapefile) to raster format (geotiff) using rasterio without template raster

I'm looking to create a raster given just a geopackage (or shapefile, or other vector format). I don't have a template raster, and all I wish to do is burn the shapes into a raster using rasterio. ...
0
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1answer
37 views

QGIS Join vector point into polygon's

I have groups of vector points (GPS points) in a number of layers in QGIS. I would like to connect the points in each layer into polygons in each individual layer. I have look hard, but can not find ...
1
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1answer
53 views

Selecting points/buffers by location according to vector area value?

I am trying to select buffers "touching" a vector layer with a specific value. This vector layer comes from a categorized raster with values of 0 to 6. How can I select buffers that "touch" or ...
0
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1answer
44 views

How to change the unknown coordinate system of a raster data to a known coordinate system

I have a set of raster datasets and have created a raster catalog out of them. These datasets should cover specific vector data. I have just realised that the raster as tif data have a coordinate ...
0
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0answers
40 views

Clipping larger vector layer to smaller layer, QGIS 2.18.25?

I'm clipping two vector layers, and I want the clipped layer to have the attributes of the smaller layer/ smaller spatial area. So, when using the clipping tool, my input is the small shapefile (80 KB)...
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0answers
21 views

Creating 3D polygon extrusions with negative values, so they cut down into map instead of rising out of it?

I'm looking to model a ditch, and the ability to extrude polygons down instead of up would be really helpful, but I can't find a way to do it. Negative values for the height don't seem possible.
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1answer
12 views

Seeking vector file of extent of flood plain of 2010 Pakistan Floods?

I am looking to locate a shapefile or any vector file that can be used for analysis I am conducting of change in size of cropland in the Punjab region of Pakistan. The file of interest would reflect ...
-1
votes
1answer
35 views

If the .osm file encodes all geospatial data, or if Mapnik encodes part of it too [closed]

I have downloaded the whole OpenStreetMap .osm file, and not wanting to decompress it or try to open it in a text editor (at almost a terabyte in size), I am looking at this XML as an example: <?...
2
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1answer
55 views

How can I modify DEM elevation data within QGIS using a polygon?

How can I modify an existing DEM using a polygon? I have a DEM raster with terrain varying between 355 and 365 meters. I have a polygon I've drawn over the area. Ideally, I would like to uniformly ...
1
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1answer
56 views

Why do symbol categories disappear when unchecked in QGIS?

I am using Qgis 2.18.25 In a vector layer, when using the categorized style, when I uncheck a category the category disappears. Is there any way to avoid this behavior? Actually I do not really ...
3
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0answers
33 views

Replacing Multiple Polygon Geometry

I am carrying out a piece of work in ArcGIS 10.4.1 that involves realigning polygons to an updated vector map. The polygons in question are planning permission boundaries that are created showing the ...
3
votes
1answer
120 views

Batch distance calculation with v.net.distance

I have three shapefiles: one containing destinations the second containing postcodes the third containing the road network I want to calculate the distance between the postcodes and destinations ...
0
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0answers
41 views

OGR - List of polygons contained in a polygon

I have two groups of polygons A and B. I wish from the group polygon B to single out all the polygons that are contained in the polygon A. For example: Based on the example I want to isolate all ...
3
votes
1answer
97 views

Adding Properties to a feature in Google Earth Engine

Is there a way to add a property to a feature in the GEE. I know that you can edit existing properties with set(), but haven't found a way to add a property.
2
votes
1answer
20 views

Change unit in Split tool on ArcGIS Pro?

I'm working on a project with a CRS in meters, map units and display units are also in meters, but Split tool (from Modify features) is in feet: Is there a way to change unit to split based in a ...
2
votes
1answer
20 views

Extract vectors from ArcGIS MapServer into virtual layer with QGIS?

This is the first time I've used QGIS, so bear with me. I have an ArcGISMapServer data source and added one of its layers to the canvas. It doesn't let me customize any of the styles, because I assume ...
0
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0answers
21 views

Georeferencing Vector File using QGIS? [duplicate]

I am using QGIS 3.2.3. I have extracted a contour layer from a PDF file and saved it as a shapefile as individual lines (using Canvas). There is no projection information associated with the data. I'...
0
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1answer
248 views

How to exclude one specific polygon from a layer which have like 20 diffirent polygons? [closed]

I have a layer with like 20 polygons which I imported from Google Earth Pro. And what I am trying to do is to exclude (isolate) that one big polygon which is in a way of all other smaller ones so ...
0
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1answer
42 views

Is it possible to add symbols in QGIS?

Is there any way so i can add symbols like ( <, > ,- ) in QGIS polygons/vectors so I can define for a example in which way is "this pipe of drainage leaking water" Working in QGIS 3.2 Bonn
1
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0answers
44 views

QGIS vectors and rasters

I have created a map with polygon shapefiles and am trying to import them onto an different raster but when I do they are larger than the raster image and are far away. What am I doing wrong? My ...
0
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0answers
40 views

ol-cesium throws exception when map.addLayer() is called with a vector layer

I have a strange behavior here using OpenLayers 5.2.0, Cesium, and the compatibility library ol-cesium. When I try to add a layer to the map, it throws an exception: TypeError: invalid 'instanceof' ...
1
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0answers
27 views

In ArcMap, how to create random points of a specific amount in each polygon?

I am doing an accuracy assessment of land-use product and need random points as test points. What I'm trying to do is to generate different numbers of random points in different polygons (like 5 for ...
4
votes
1answer
38 views

Extract value from vector to another

I have two vector (shapefile) data. One contains soil order for county, and the other one contains boundary for each county. I want to extract the soil order for each county by using county boundary. ...
2
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0answers
22 views

Issue with vector grid and calculating area QGIS

I'm trying to determine the area of occurence from a large polygon superimposed onto 2km x 2km grids. The goal is to have a slightly coarser answer then a straight area of the original polygon as the ...
1
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2answers
253 views

Clipping shapefile with Python?

My problem is the following, I cannot find a reasonable method to clip 2 vector based shapefiles using python (without ArcPy or QGIS API). I tried using the geometry.intersections method, but that ...
1
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0answers
36 views

How could I assess the value of a polygon according to the value of his neighbor?

I would like to know if it is possible to give a value to a polygon, according to the value of the polygons around. I want to assess the ecological integrity of an aquatic network (lakes, pond, ...
0
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1answer
14 views

Vectorising lines appear as a mixture of bubbles and lines from raster map

I have these road raster maps which I have reclassified into binary images to try and vectorise. However, when I click on vectorise and generate feature, it comes out as a mixture of bubbles and lines ...
1
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1answer
25 views

'Regular Points' vector layer in Bonn

I've downloaded the bonn version of QGIS. Using the 'regular points' vector analysis tool, I've set some 5m regular points over a field so that I can use the x,y coordinates to plot them and measure ...
1
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1answer
39 views

Discerning dwelling types in QGIS? [closed]

In QGIS, I want to discern between a number of building types, based on topology. I have data on buildings, parcels and addresses. I'm having a hard time to discern between row/terrace, end-of-...
0
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0answers
20 views

Splitting one vector file with multiple polygons into individual files using QGIS? [duplicate]

I download the administrative divisions of a country from gadm.org as a kmz vector file. I imported it into QGIS Desktop. How do I split the polygons from this file and then export them as ...
3
votes
1answer
144 views

Digitize objects in a LiDAR point cloud?

I am working with LiDAR point cloud data of road networks. The goal is to digitize all visible objects like hydrants, streets, sidewalks. My input data is available in LAS or ASCII format. My first ...
1
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0answers
44 views

Cluster spatial - cannot allocate vector

I'm trying use this code for create cluster spatial in R, I get from @ssanch: # example data from the thread x <- c(-22.83982, -23.49961, -27.08745, -22.98890, -19.92278) y <- c(-47.20671, -46....
1
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1answer
36 views

pyqgis 3 setup vector labeling not working

I have a standalone pyqgis3.2.1 (Bonn) application that can display maps (vectors, rasters). I tried to setup labeling of vector layers using the following codes, but it only works for point layers, ...
1
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0answers
23 views

Create a path in mapping software and export as vector?

Is it possible to map a route in any mapping software (OpenStreetMaps, Google Maps/Earth, QGIS, etc. preferably Open Source or free) and export this route as a vector (PDF, AI, SVG etc.)? I'm only ...
1
vote
2answers
231 views

Convert Raster to vector - create polygons based on each pixel

I want to convert a raster file (100x100m pixel size) which contains population counts as pixel values. I need a vector based file of the 100x100m grids and the population as attributes. I tried ...
0
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0answers
7 views

QGIS Error while Reprojecting a ATLAS BNA file (.bna vector format) from WGS84 to UTM Zone

In QGIS, I want to reproject a ATLAS BNA (.bna vector format) from WGS84(EPSG:4326) to UTM zone 37S(EPSG:32737). I have tried all the options in GDAL/OGR Toolbox, GRASS GIS, SAGA GIS and QGIS ...
1
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1answer
57 views

How do I create a line with fixed size from a single point in QGIS?

My question pretty much sums up my problem. Basically, I have a layer containing points: And I need to convert them into lines with fixed size (25 meters). I don't care if the point will be taken as ...

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