Questions tagged [vector]

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

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28 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 ...
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61 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, ...
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1answer
18 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 ...
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1answer
276 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 ...
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1answer
343 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; ...
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20 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 ...
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1answer
79 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 ...
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3answers
96 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 ...
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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 ...
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1answer
682 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 "...
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1answer
52 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 ...
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1answer
787 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....
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1answer
454 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 ...
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1answer
217 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 ...
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1answer
235 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 ...
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0answers
58 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. ...
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1answer
309 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 ...
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2answers
125 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 ...
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67 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 ...
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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 ...
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0answers
92 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 ...
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1answer
2k 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 ...
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0answers
65 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 ...
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23 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 ...
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1answer
191 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 ...
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1answer
118 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"...
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1answer
47 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 ...
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0answers
211 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 ...
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1answer
51 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 ...
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1answer
53 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:...
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1answer
48 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?
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2answers
473 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. ...
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1answer
171 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 ...
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1answer
85 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 ...
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1answer
76 views

Changing unknown coordinate system of raster data to 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 ...
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1answer
35 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 ...
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1answer
47 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: <?...
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1answer
351 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 ...
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1answer
108 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 ...
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0answers
59 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 ...
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1answer
249 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 ...
3
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1answer
1k 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.
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1answer
43 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 ...
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1answer
114 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 ...
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0answers
37 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'...
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1answer
258 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 ...
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1answer
45 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
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46 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 ...
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0answers
101 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' ...
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0answers
43 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 ...