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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9
votes
3answers
4k views

Order of polygon vertices in general GIS: clockwise or counterclockwise

Two days ago I asked a question about the internal storing order for the vertices of a polygon in ESRI shapefiles. That question was answered (Are polygons stored clockwise or counterclockwise in a ...
11
votes
5answers
48k views

Creating polygons from lines using ArcEditor/Standard level license of ArcGIS Desktop?

I am trying to create polygons from a line layer of lots and concessions (large blocks of land in rural areas). The lines are mainly grid style as they intersect mostly at right angles. I need to ...
2
votes
0answers
21 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 ...
2
votes
1answer
36 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 ...
1
vote
0answers
14 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
votes
0answers
21 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 ...
4
votes
1answer
97 views

How to find the distance from a point to a polygon, via another point, in R

I am trying to calculate the distances between a central point, and the edge of a polygon, along straight lines drawn between the central point and another set of points (where necessary extended ...
0
votes
0answers
30 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 ...
1
vote
1answer
542 views

Is it possible to draw polygons along Google Maps Polyline?

Web application has option that user draws polyline on Google Map. After he draws it, there is a button 'Add polygons', which should draw polygons along that line, based on some width and height in ...
1
vote
0answers
12 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?
1
vote
1answer
456 views

How can I move two layers at once in QGIS?

I'm trying to move two digitized layers, one containing points, the other polygons to a different location at the same time. QGIS doens't seem to allow this. Even if I select both layers and features ...
0
votes
1answer
62 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 ...
18
votes
3answers
6k views

Proper way to rbind SpatialPolygonsDataFrames with identical polygon IDs?

What's the proper R idiom for rbinding SPDFs together when the IDs overlap? Note that here (as is often the case) the IDs are basically meaningless so it's pretty annoying that I can't just make ...
0
votes
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
vote
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
vote
1answer
29 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 ...
3
votes
1answer
42 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 ...
0
votes
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
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 ...
0
votes
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
votes
1answer
456 views

Clipping multipatch to polygon using ArcGIS for Desktop?

I have a multipatch dataset and a 2d polygon. Which ArcGIS geoprocessing tool can I use to select only those multipatches whoms x,y are inside the polygon? I want to select all multipatch features ...
1
vote
3answers
236 views

Split polygon based on line segment

I am trying to split a street polygon based on the segment ID of the street, giving them the same segment_ID in the attribute table of the street lines. I did not use the line feature class to derive ...
0
votes
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 :
2
votes
2answers
210 views

Is there a way to clip a polygon layer according to DEM elevation?

I have a polygon layer on top of a DEM. Is there a way to clip the polygon layer according to elevation, ie the clipped result being only those areas of the polygon layer between x and y altitude? ...
0
votes
1answer
22 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 ...
1
vote
2answers
594 views

How to resample polygon vertices so that they are evenly spaced in Arc 10

I have digitized the outline of many river channels (by both manually picking points and using streaming mode), but now I need the vertices to be evenly spaced (for input to another program). I tried ...
3
votes
2answers
173 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
0answers
49 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 ...
0
votes
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 ...
1
vote
2answers
116 views

Creating polygon grid with un-even spacing between research plots?

I have an orthomosaic of a crop field with small research plots (3.8 X 1.44 m and 0.22m b/w plots and 0.50m b/w range spacing). I would like to create a polygon layer using this information. After ...
0
votes
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
votes
2answers
378 views

Extracting multiple values of raster to polygons using ArcGIS for Desktop?

I was hoping I could get some help on how to extract information from a land use raster using polygons. I have a layer with 157 polygons and a land use raster with multiple land use categories for the ...
2
votes
1answer
47 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)....
2
votes
1answer
216 views

Intersection between polylines feature to polygon in QGIS

I would like to transform a line shapefile into polygons. However, the tool Vector>Geometry>Line to Polygon doesn'to work to me. What I would like to do is using the intersection between lines and ...
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 ...
0
votes
0answers
55 views

Iterating through multiple polygons to produce a table with elevations using DEM?

My question is similar to Iterate through multiple Raster files and compute statistics using Zonal Statistics However, what I want to do is use ModelBuilder to use individual polygons to define the ...
0
votes
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 ...
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 ...
1
vote
1answer
223 views

Assigning overlapping polygons based on attribute using ArcGIS for Desktop?

I am using ArcGIS 10.1 and have a polygon shapefile with 16000 records. There are many polygons that are overlapping and my goal is to determine the overlap portions fix the problem, so that there ...
0
votes
1answer
225 views

Converting polyline data to polygons?

I am trying to convert some polyline coastline data into a polygon that I can use to clip/subset back other data sets by this polygon. There are some small gaps in the coastline data, which ...
1
vote
1answer
88 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/...
16
votes
6answers
18k views

Performing reverse clip in ArcMap?

Is there a way to perform a 'reverse' of the clip function in ArcMap? I am not exactly sure how to explain this so here is a diagram:
3
votes
1answer
510 views

How do I smooth edges of polygons in QGIS?

Is there a built in function or plugin I can use to achieve smooth lines for my polygons instead of the blocky ones I have now?
-1
votes
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
382 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://...
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
votes
1answer
368 views

Using ArcGIS Tabulate Intersection to determine maximum land cover within polygon area

I have a shape file (layer A) containing different polygons - each polygon representing an ecoregion. I have another layer of polygons (layer B) - each polygon representing a watershed boundary. I ...
2
votes
2answers
186 views

How to quickly fill multiple gaps in a series of adjacent polygons

I've been given a "background" dataset which is designed to draw as the first layer in a complicated map. For some reason the data provider has previously erased this dataset with roads, parks, etc. ...
1
vote
1answer
86 views

Edit raster classification manually using polygons in ArcMap?

I want to edit the elevation/z values of certain zones on a raster in ArcMap. I followed this example by creating a polygon, assigning a value of 7.5, then converting the polygon to a raster, finally ...
0
votes
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 ...