Questions tagged [vector]

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

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480 views

Vector title attribute can't display?

var vectormap = new OpenLayers.Layer.Vector('Overlay', { styleMap: new OpenLayers.StyleMap( { "default": new OpenLayers.Style({ ...
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0answers
207 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
168 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 ...
2
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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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1answer
4k views

How to make a density map from polygons/rasters (ArcGIS)

I would like to make a density map of grasslands. I have a vector layer of habitat classifications, I would like to a density map of grasslands within a specified radius. My thoughts are to: ...
2
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2answers
931 views

Most recent tectonic plate data

What is the latest update to the positions of the tectonic plates? Does anyone have a most up-to-date shapefile or vector of the tectonic plates?
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1answer
51 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
84 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 ...
4
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1answer
519 views

Joining csv file to vector layer in Processing modeler?

I am trying to join a simple CSV file of values to a vector layer within Processing modeller. The match would be on an ID held by both files. The CSV file has no geometry. I can do this easily in ...
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8answers
30k views

Georeferencing vector layer with control points using QGIS?

I have a non-georeferenced vector layer that I need to be georeferenced. With raster layers the task is easy and straightforward, but I have no idea what should I do with my vector layer. I have a few ...
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2answers
2k views

Render order of vector features in OpenLayers 3

In a web map application I have a vector layer from a GeoJSON source of country borders. The layer loads perfectly and interactions such as ol.interaction.select works fine as well. I want to style ...
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2answers
738 views

how do i create OGRSpatialReference from raster file's georeference C++

I want to create .shp file using ogr with georeference based on my raster file, so i create an ogr layer using CreateLayer( "point_out", NULL, wkbPoint, NULL ); i want to set the OGRSpatialReference ...
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3answers
344 views

Cutting Polygons in QGIS at a specific distance from a feature in another layer

I would like to be able to cut polygons such as the one below, in QGIS, at a set distance either side of a specified feature on another layer, in this case a footpath line from OS Mastermap. In this ...
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3answers
6k views

Convert MultiLineString to LineString using QGIS

In QGIS, I've tried the following options to convert my GeoJSON file from MultiLineString to one or multiple LineStrings (translating the Danish version): Vector -> Geometry Tools -> Polygons to ...
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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 ...
3
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1answer
247 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 ...
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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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2answers
457 views

Rotation of text in QGIS?

I am using Qgis 2.16 version .I have some basemap data but when I load it in the text layer (I can’t remember what its called but you should be able to see road names, house numbers etc) has an “...
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.
2
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1answer
342 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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2answers
1k 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 ...
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4answers
728 views

Creating custom symbology in ArcMap?

Can I change the shape of the shield on a point symbol from square to circle as shown in the image? Alternatively, can I import symbols (specifically in a vector format) from Corel Draw? It can'...
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1answer
173 views

How to get parcel boundaries with tax roll, land use, and zoning info?

How do I get parcel boundary shapefiles with tax roll, land use and zoning info included? Is it possible to just create the parcel boundaries data from scratch, i.e. could I create parcel polygons in ...
3
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1answer
336 views

Calculating distances from points to centre of cells using QGIS?

I am using QGIS 1.8.0 (using older version because I need the Qmarxan plugin which is not available for 2.4.0). I have a study area that has a vector laying of "planning units", or cells over the top ...
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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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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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2answers
7k views

Georeferencing vector PDF/SVG/DXF linework using QGIS?

I want to create a small web application to visualize election results on a per poll site basis for my city. The result is going to be very similar to what has been done for Berlin here. Hopefully ...
2
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1answer
112 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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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
4
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1answer
64 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. ...
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2answers
567 views

Mapping continuous vector data on a continuous colour gradient in ArcMAP 10

I'm plotting vector data for different attributes for countries across Europe. I've used symbology to plot categories of countries. However, the data are numbers so are on a continuous scale. I would ...
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0answers
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 ...
3
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1answer
413 views

Adding vector layer to QGIS?

I am learning QGIS from scratch. Downloaded the software and data. I am following their manual uploaded in PDF format. I am stuck in the first step to add the vector layer. The layers panel show a ...
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0answers
99 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 ...
14
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2answers
5k views

Moving points onto lines (~neighborhood)

I do have two vector layer, of which one is a point layer based on "events" by remote sensing and the second one is a line layer from local research. In my case these are earthquakes and tectonic ...
2
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2answers
559 views

QGIS Convert vector classification map into raster

I tried to convert vector classification into raster file for accuracy analysis following these suggestions My vector data is like this: However, none works The first one, interpolation, resulting ...
2
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0answers
31 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 ...
36
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4answers
58k views

Loading OpenStreetMap data in QGIS?

In QGIS 1.8 I used the openstreetmap plugin to request data from the server, or open a .osm XML file, which produced 3 layers (polygons, polylines and points) in QGIS. This was great (give or take ...
11
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1answer
18k views

Removing overlapping/duplicate polygons in same layer using QGIS?

I am working in QGIS on a vector layer where areas are classified using an attribute "typo". The problem I'm encountering is that many polygons are duplicated or overlapping, with the result that some ...
2
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1answer
298 views

Combining DEM file with building (height) vector files using ArcGIS Desktop?

I am using ArcMap 10.2. I need a DSM file to use for my thesis to run visibility analysis on it, but my case study (Tehran) do not have LiDAR data. So I am thinking to combine a DEM file with ...
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2answers
4k views

Clip polygon and retain data?

I have these two polygons: library(sp); library(rgeos); library(maptools) coords1 <- matrix(c(-1.841960, -1.823464, -1.838623, -1.841960, 55.663696, 55.659178, 55.650841, 55....
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0answers
40 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, ...
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1answer
139 views

Hydrological conditioning using stream vector in GRASS?

I would like to make an hydrological conditioning of a DEM using an available stream network in vector form. I know r.hydrodem but it doesn't allow to use the stream vector. I need something to burn ...
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1answer
20 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 ...
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1answer
40 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
66 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-...