On a map, a closed shape defined by a connected sequence of x,y coordinate pairs, where the first and last coordinate pair are the same and all other pairs are unique.

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13 views

Create polygons based on Attribute

I have a Lake Layer for a state in which there is a field that contains the overall score(1-5) for a lake. Based on the overall score attribute, I need a way to create polygons that group these ...
1
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0answers
17 views

QGIS Snow Cover extent extract

I have a year worth of daily snow cover data in tif files. I want to merge them all into one (stack) and select a polygon from which I want to extract snow cover extent as in sqare miles and as % of ...
1
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0answers
13 views

Troubleshoot with “Split selected features with selected line from another layer”

I am trying to use the "Split selected features with selected line from another layer" tool from the plugin Digitizing Tools in QGIS. Sometimes, this tool works with my shapefiles but sometimes it ...
0
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1answer
26 views

Rendering polygons with Qgis2threejs?

I have a polygon shapefile cotegorised according to a specific field. I want to present that 3D with the help of Qgis2three.js (sth like that). I have installed the plugin and have chosen the polygon ...
2
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1answer
22 views

R/ggplot2 adding an additional line/polygon to a choropleth map

I have a choropleth map that represents the number of states being affected by a storm event. This is shown in the image below. I want to lay a transparent line or polygon over these states to ...
2
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0answers
26 views

how to efficiently detect intersect between polygons?

So I'm trying to implement box selection in leaflet. Currently i'm using turf's intersects function to detect if the box intersects with any of my geojson polygon features. However, this is very ...
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0answers
24 views

How to programmingly get the feature from a layer by the feature's ID in Python QGIS? [on hold]

I have get a list of polygon features' ID, I want to get the corresponding polygon features by these IDs in the layer, then if I want to do some calculations by using the polygon's geometry. How can I ...
2
votes
1answer
41 views

Calculating 3d polygons' surface area using ArcGIS for Desktop?

I've got a polygon feature class with Z values enabled. The polygon entities represent billboards. I'm looking for a way to measure the front surface area of this entities - i.e the area of the ...
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0answers
16 views

Converting 3d polygon feature class into MultiPatch feature class using ArcGIS for Desktop?

I've got a polygon feature class with z values enabled. The polygon entities represent billboards. I'm looking for a way to convert those polygons into MultiPatch feature class entities. I'm using ...
1
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0answers
13 views

Setting color from color value in attribute table in QGIS? [duplicate]

I have a shapefile with colors (hex code) in the attribute table for each polygon. How can I set color of each polygon according to the color value in the attribute table?
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0answers
17 views

Polygons from Adobe Acrobat PDF to Arc

I am tracing building plans in adobe acrobat. There may be a time in the future I will be asked to take the polygons and overlay them in a GIS for a borough-wide map. Are there any steps I can take ...
1
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0answers
20 views

Calculate distance between polygons on two separate layers using ArcGIS for Desktop?

For my purposes, I need to find for each polygon in one feature dataset (red polygons) the outemost (from edge to edge) polygon in the second feature datasets (green polygons). Paradoxically, seeking ...
1
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1answer
33 views

Loading WKT polygons into QGIS

I have downloaded a file showing the status of the National Broadband Network. The CSV file contains a field "Development Shape", which contains "POLYGON ((153.101112401 -27.797998206, 153.097860177 ...
0
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1answer
63 views

Drawing concentric circles that correspond to free space loss formula?

I want to be able to draw a circle with 50km radius and then fill the circle with values corresponding to the free space loss formula below: FSPL(db)=20 log10(d)+20log10(f)+32.44 for example: a ...
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0answers
14 views

dismo::randomPoints generating fewer points than requested in R

I'm using the randomPoints function in the dismo package to generate sets of point locations within two polygons. I've converted the polygons to rasters, where the cells within the polygon = 1, and ...
0
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0answers
31 views

How to project 2D (poly)lines and polygons on a point cloud or a (tri)mesh (TIN)?

I'm searching a way to project 2D (break)lines and polygons (they are in an ESRI shapefile but I can translate them to something different if needed, like geojson for example) on a point cloud (seems ...
0
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1answer
39 views

Create a fishnet inside an a symmetric polygon using ArcGIS desktop 10.3

I try to create a fishnet with 5 columns and 3 rows to this polygon: but i get this result: whereas is wanted the grid will be adjusted to the polygon direction like this :
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0answers
18 views

Comparing multiple point datasets to polygon dataset?

I have multiple point datasets indicating presence absence and i want to compare them all to a polygon dataset to calculate cumulative score for the polygon i.e. presence of points in 2 point datasets ...
2
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0answers
53 views

polygon/polyline digitizing techniques for geological data

My current work involves extensive digitising of historic geology data - essentially the creation of new polygons and polylines based on overlain raster and vector layers. This is all done manually ...
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1answer
20 views

How i compare two objects ol.geom.Polygon?

I have two objects ol.geom.Polygon and I need to compare if this two objects are equal. For example if this objects have the same coordinates, these objects are equal but if the coordinates are ...
0
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1answer
24 views

How to add draw over an OpenLayer 3 map?

I am new to OpenLayers 3. I am trying to learn how to draw and save data over an OpenLayers map. Following an example, I am trying to learn about drawing and saving data. However, I am unable to draw ...
3
votes
1answer
43 views

Geoserver and “inverting” a multiPolygon to dim the rest of a map

I think it is time to re-design the result presentation of my reachability analyses (which are computed using multimodal isochrones). Right now I am just showing a multipolygon on a leaflet map that ...
1
vote
1answer
35 views

Modifying the texture/fill of a vector layer in PyQGIS

Currently I am writing a standalone Python script to modify a few vector layers to have a wine fill pattern inside. The geometry I am working with is a polygon. I am aware of how to change outline ...
0
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1answer
48 views

R or ArcGis: average per polygon of the shortest distance to a river from each point in that polygon

All the shapefiles necessary can be found here. These are shapefiles of lakes, and rivers. Downloading one shapefile as an example should be enough to get me on the right track. The nuts file can be ...
0
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1answer
16 views

ArcGis: Count categorical variable per nuts3 by overlapping point-file and polygon-file

Download from this website the NUTS_RG_60M_2006 files (shapefile) and the csv-file T_DischargePoints_West.csv (source) and save them on your computer. Open them through ArcGis and plot xy-points. You ...
1
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1answer
89 views

Max value of overlapping Polygons

Licence: Advanced Version: ArcMap 10.3 In my shape are thousands of overlapping polygons. My goal is, to generate a new output in which the biggest overlapping value represents a new polygon/...
2
votes
1answer
52 views

CityGML: Calculate orientation and inclination angles from a polygon's LinearRing coordinates

I have multiple CityGML files of different cities. Only one of them is in such a good condition that it includes the orientation and inclination angles of every roof polygon (as a gen:stringAttribute)....
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0answers
24 views

Trying to join a column from one table to another using python [duplicate]

So I have two tables, one has county polygons, the other has well Points. I am trying to first calculate the total numbers of wells that fall into that county, and update the county table with the ...
2
votes
2answers
386 views

How to create a polygon fill as seen in the QGIS 2.16.0 changelog?

The polygon fill for 'Urban parcels' in the following .gif animation looks really cool. http://changelog.qgis.org/media/images/entries/5817785cf3d18db78669c2eb2c2be0cf606c3783.gif (See also: http://...
0
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0answers
11 views

How to render elevation polygons as concentric polygons with increasing order of their height at given point in geoservert

I have create a postgres database that contains the elevation polygons at various elevation heights of sachsen. I wish to render these elevation polygons in a similar manner as they appear in the open ...
2
votes
0answers
28 views

Python Shapely - filling small gaps between multi polygons

I have a set of rectangular polygons, which currently form a directional path. The library I am using is Python Shapely / GeoPandas. The issue I am having is as the path changes direction, there are ...
4
votes
1answer
47 views

How to create random points in overlapping polygons?

I have a shapefile with ~1840 polygons, many of which overlap. I'm trying to find a way to create 1000 random points per polygon, based on polygon ID. I don't see a way to this using the GUI Random ...
3
votes
0answers
45 views

How to use the 'Check Geometries' plugin for polygons?

I've a few hundred polygon features with many duplicate nodes, gaps, overlaps and other geometry errors. Fixing all errors seems to be quite tricky. I had to run the duplicate nodes check twice to fix ...
0
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0answers
39 views

Raster to polygon tool not working

I am trying to convert a raster to polygon in ArcGIS 10.2.2 but when I run the tool, it says complete but no polygon file is created and the tool window pops up again. I have tried converting the ...
5
votes
2answers
91 views

Perfect circle in ArcGIS, why I get a multiside polygone (plurigone)?

Using ArcGIS basic (10.3), I tried to make perfect circles in ArcGIS with the buffer tool. As you can see on the two print screens, the circle is not perfect when I use a radius of 7,5 meters in a MTM ...
0
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0answers
36 views

find a percentage of an irregular polygon area like a county

I need to find a certain percentage (69%) of the area of an irregular polygon. Not a parcel. I am using ArcGIS 10.3.1 Desktop.
0
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0answers
45 views

Select Markers Via a polygon and get the name

I created a map with open layers where i am able to select Markers, make them names appear in a field. But now here is my problem : i want to be able to select markers with a polygon, draw my polygon ...
1
vote
1answer
43 views

How to split polygon into equal segments in QGIS?

I try to split polygon layer into equal length segments of 1000m: The attribute table of the layer is: I have read those links but didn't find a solution to my question: How to split a vector ...
0
votes
1answer
30 views

Quick way to produce polygons to cover variable precision lat / lon points?

I'm using the Smithsonian Global Volcanism Database and have a .csv lat lon points from it. It seems they are using decimal precision on their lat lon to give a rough idea of the size of the area that ...
3
votes
2answers
174 views

How to compare polygon boundaries in PostGIS?

I've to compare two polygon layers, 'land_use' and 'land_parcels', in PostGIS. My aim is to create linestrings, where boundaries of 'land_use' polygons do not match boundaries of 'land_parcel' ...
1
vote
1answer
33 views

Measure polyline length in QGIS

I try to measure the length (in meters) of the polyline layer that pass inside the olive polygon layer only, and if it possible export the wanted polyline into new layer: the attribute table of the ...
0
votes
0answers
20 views

Openlayers 3 polygon not rendering on map

I've set up a small example of an OpenLayers 3 map, and I am trying to add a custom polygon to the map. If I use the data from the example, it works correctly, the polygon renders, and it is shown on ...
0
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0answers
56 views

Which GIS software allows manually creating shapes from overlapping shapes of other layers?

I have two shapefiles, one showing the borders of the US states, the other one showing river basins. Both layers are filled with solid colors, with the US states differing in hue and the river basins ...
0
votes
1answer
43 views

Convert SpatialPolygonsDF boundaries to SpatialLinesDF keeping information on polygons

I have a SpatialPolygonsDataFrame and I need to convert polygon boundaries into a SpatialLinesDataFrame retaining the attributes of the 2 polygons The structure of the SPDF looks like this 'data....
0
votes
0answers
9 views

Values missing with Polygon to Raster tool

I am trying to convert a polygon to raster using a field with six unique values as the 'Value' field in ArcGIS 10.2. However, when I do this, one of the values does not appear and instead those pixels ...
1
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0answers
24 views

Changing colors in SVG file polygon using QGIS?

I try to change colors and lines width in this polygon (this is SVG file): I learn from here SVG symbol colors differences in QGIS 2.12? Using SVG file to fill polygon using QGIS- problem to add ...
-1
votes
1answer
30 views

Count polygons crossed by other polygons using ArcGIS for Desktop?

I have two polygon feature classes, census blocks and voting precincts. What I want to get is the count of census blocks that contain more than one voting precinct, that is, where precinct boundaries ...
-1
votes
1answer
34 views

Select polygons (A) that contain polygons (B) by using R code

I am wondering how to select polygons (A) that contain polygons (B) by using R code. B<-readOGR(dsn="H:/AP", layer="WWTP") A<-readOGR(dsn="H:/AP", layer="catchment")
1
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0answers
38 views

Using SVG file to fill polygon using QGIS- problem

I try to fulfill polygon with SVG file (which created with inkscape) but when i load the file into QGIS by this way: i get polygon layer with no symbology: Now, i red Using SVG from Wikipedia ...
1
vote
1answer
52 views

How to calculate the area of polygon features within another polygon feature layer

As shown below, I would like to calculate the percentage of each red feature (landscape zones) taken up by a green feature (forest zone). So I need the summed percentage of forest zone for each ...