Questions tagged [vector]
A coordinate-based data model that represents geographic features as points, lines, and polygons.
1,285 questions
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3 views
Georgia,US Land Lot District dataset
can anyone point me to the data source of the Georgia, US Land Lot District lines?
Parcel/Cadastral system in Georgia is based on these lots, and I've spent hours searching for the data.
Thanks!
1
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1answer
32 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
48 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 ...
2
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0answers
28 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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0answers
59 views
+50
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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0answers
23 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
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1answer
26 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
19 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
12 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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16 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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20 views
Earth Engine error “Tile error: Unable to reproject polygon with 505361 > 200000 vertices.”
I am trying to do some analysis using Earth Engine to find raster statistics within vectors of Economic Exclusive Zones (EEZs).
I've uploaded the shape files of the EEZs as a table within Earth ...
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1answer
238 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
39 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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6 views
Best vector based editing software for ArcMap .svg and .eps exports. Not Illustraitor [migrated]
I am looking for freeware software which I can use to touch up my maps after exporting from ArcMap.
There is just one PC where I work with Adobe Illustrator and I can hardly ever get on to it so I am ...
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0answers
42 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
30 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
25 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
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1answer
34 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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11 views
QGIS, Merge Vector Layers Tool, problems copying the path of the new file
I am trying to merge some vector data (polygons), using Merge Vector Layers Tool, and it is very important for me to copy also the path of the new data from our server, to the main data.
I am using ...
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 ...
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0answers
20 views
Error when masking raster with vector (GPKG)
I am having issues when trying to mask a raster with a vector layer. First, a little summary. I´ve been trying to classify tree canopy in a map. In order to do so I've used a DSM and DTM substraction, ...
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2answers
133 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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0answers
33 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
21 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
36 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-...
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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 ...
1
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1answer
97 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 ...
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0answers
30 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
28 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, ...
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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 ...
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0answers
45 views
QGIS raster data to shapefile data as decimal number
in QGIS I have a problem with converting raster data to shapefile data.
My data from the raster (values such as 0.13, 0.65, 0.67 etc) converts into a rounded value in the shapefile. At first, I tried ...
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2answers
89 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
5 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
55 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 ...
0
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1answer
44 views
Count how many times an attribute in a polyline intersects a polygon in QGIS
I am trying to count how many times a polyline with a specific attribute intersects a polygon in QGIS. For example, I have a polyline with a feature class called "size", this contains a text value i.e....
5
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1answer
87 views
LiDAR returns over water bodies?
I have obtained LiDAR data from my environmental agency in order to obtain the relative heights of each watercourse station. A far as I know, LiDAR signals do not get returned over water bodies. ...
2
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1answer
43 views
Read a Raster Band Value inside of a VectorLayer in QGIS [closed]
How to read pixel values in RasterLayer that intersects line features of VectorLayer, applying Python in QGIS?
8
votes
1answer
145 views
Split up shapefile into little shapefiles
I have a very large shapefile (all the roads in RI). I need to split it up into chunks so that I can process the file with multiple worker threads in Python. So far I have created a grid in QGIS that ...
2
votes
1answer
76 views
Distance to Nearest Hub QGIS not working when 'hub' is a line?
QGIS 2.18.20 working in CRS: WGS 84/UTM Zone 35S (EPSG:32735 OTF), with shapefiles of map features (roads, river, point water sources) reprojected from WGS84 EPSG:4326.
All shapefiles have been ...
1
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1answer
26 views
QGIS Union erroneously creating gaps
I'm trying to do a union between two Polygon Shapefiles, but when I do Vector > Geoprocessing Tools > Union I have the odd issue where most of it works fine, but some areas are returned in the union ...
0
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1answer
31 views
Openlayers 3.10 can't display features added manually
I'm trying to add features manually to vector layer but with no luck.
This is my code:
cords[0] = {
[19.1820888104, 49.6835693017],
[19.1819108957, 49.6850423191],
[19.1846518426, 49.6853635871],
[19....
2
votes
2answers
81 views
Clip Raster by Attribute values
I have a raster which I want to do a clip with a vector layer (polygon) using its atttribute values.
What I have done so far is the folliwing:
from qgis.core import *
from qgis.gui import *
import ...
1
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1answer
140 views
Attribute Error: 'unicode' object has no attribute 'extent'
I keep getting this error from this line.
arcpy.CreateFishnet_management(os.path.join(Output_Folder, "Full_Grid.shp"), str(NAR_U9.extent.XMin) + " " + str(NAR_U9.extent.YMin), str(NAR_U9.extent.XMin)...
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0answers
31 views
QGIS topology check shows different topology check results for same area
I used QGIS topology checker for parcel data of an area in QGIS 2.18. The rule used was- 'Parcel must not have gaps'. The result showed many error (gaps) and while zooming in and zooming out, the ...
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0answers
17 views
Polygon interpolation neighbour average?
I am trying to estimate empty values based on a polygon layer we received from another study. Is there a way to calculate an average value for polygon A based on neighbours B,C, etc that border it?
I ...
1
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0answers
39 views
QGIS: Fill shapefile vectors with grayscale based on elevation
I am very new to this and feel like this is probably an easy answer, but after days of searching this forum I still am unsuccessful.
I have shapefile data with elevation and I want to create a raster ...
0
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2answers
121 views
How to assign raster layer's colors to polygons in QGIS?
I have a georeferenced raster file showing parcels of a town with different colors (yellow for the category single-household residential, green for agricultural areas, etc.). I also have the shapes of ...
0
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0answers
36 views
Opening National Land Cover data?
How do I open the National Land Cover data in QGIS 3.0? Attached is an image of the files. It looks like it's an .rrd file.
2
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2answers
160 views
How are the coordinates for multipolygons arranged?
How are the coordinates for a multipolygon (i.e. polygon with a hole in it) arranged?
Do shapefiles and geoJSON files always save the coordinates for the outer ring first?
I'm asking because I ...
