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 views

Insert a row with the_geom polygon!

I'm a beginner, i'm looking for a sql insert store with item having the the_geom style of polygon. I know the way to insert row with point like that: CDB_LatLng(10.51, 20.51), so can i do the same ...
0
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2answers
357 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 ...
11
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4answers
47k 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 ...
12
votes
0answers
525 views

Writing Python script for ArcGIS to square polygon corners? [closed]

I'm looking for a script that will square the corners of polygons that are near 90 degrees but not exactly. Near could be dealt with via a variable, for example within 5 degrees of 90 (85 - 95 degrees)...
1
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2answers
586 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 ...
1
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1answer
115 views

Finding all polygons inside of a polygon

How to find all the polygons inside of a polygon? I tried ST_Intersects and ST_Contains but they are booleans variables. I have a list of polygons in WKT format, so I am trying to pull all the ...
0
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1answer
24 views

Not all polygons digitize when converted from lines

I have a polyline feature consisting of a grid. I attempted to convert this grid into a polygon using the "Feature to Polygon" geoprocessing tool, and it appears that not all lines have been carried ...
0
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1answer
44 views

How to find the distance between neighboring points in ArcGIS 10.3?

I have two shape files: one has point features indicating urban centers, the other is a polygon features file that has counties. Each county has one urban center. There are around 2800 counties. I ...
1
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0answers
45 views

Shapefile layer export issue

I am using QGIS to define polygons in a shapefile layer which I am then exporting as an ESRI shapefile for use with JMP. The polygon layer looks correct on-screen in QGIS, but the exported files have ...
0
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0answers
14 views

Arcmap 10.2 (query builder and or Expression)

I want to turn off selected sect_label numbers from showing up on my base map as I have a shapefile with Section and acreage loaded for a specific area and i need to use the shape file because it lets ...
0
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1answer
1k views

How to narrow the result from Nominatim with only cities and countries, no additional areas with the same name?

I'm trying to get WKT or GeoJson polygons of cities and countries from Nominatim (for example, Paris and France). I send a GET request but it returns me several results named "Paris" or "France". How ...
4
votes
2answers
57 views

Display multiple identical polygons (with different attributes) on map

I need to create maps of multiple species in a certain area. However sometimes multiple species occurr in the exact same area. This results in two identical polygons on top of each other. Many of ...
0
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1answer
211 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
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0answers
20 views

ol3-cesium polygon float

I’m trying to build a webmap using ol3-cesium libraries , when I switch 2d map to 3d map my polygons (geojson or geoserver wms, wfs) are not draped on stk-terrain but they are under the ground. I ...
2
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0answers
158 views

QGIS, How to label a layer in different font sizes, shrink to fit in polygon or a multiple line label?

I am just trying to figure out how to label a polygon layer to fit its size in QGIS. or if its very long title should break in line and scale, i did some research but couldn't find anything helpful is ...
2
votes
2answers
182 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. ...
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0answers
25 views

R - `rasterize` of polygon fails to properly take account of internal hole

I'm trying to use R to mask out a DEM raster using a polygon (loaded from a GML shape file) using the following code, where dem_modern is the raster and modern_land_shape is the vector polygon : # ...
0
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1answer
24 views

How do I make a grid around all my points, and then convert it to a polygon [duplicate]

I want to make a grid around all my points, convert to a polygon and use this to clip the extent of my data. I am using Arc 10.2. How do I make a grid and then convert it to a polygon? Or is there a ...
0
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2answers
157 views

Intersection between line and polygon

I have 2 layers in OpenLayers: first is parcel layer (polygons) and second is railway layer (lines). They are already drawn and all I need to do is when I click on some line, to get intersection of ...
0
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1answer
344 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 ...
3
votes
1answer
494 views

Determine when I have crossed state line?

We are currently using the Google Maps API to get route information and total mileage but we would like to determine when we are crossing into a new state. When we return the route information we can ...
0
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2answers
41 views

How to (precisely) re-align a polygon

I have this shapefile and I want to re-align the selected polygon (See image below) to the shapes of the other polygons. I tried using the "edit tool" but it's not producing a good result. What would ...
3
votes
1answer
29 views

Problems with dividing multipolygons into polygons

I have a shapefile with countries boundaries downloaded from here and I am trying to upload it to PostGIS database with ogr2ogr. This file contains features of polygon and multipolygon types and ...
3
votes
1answer
48 views

Create an optimised path between nodes avoiding polygons entities

I have a point shapefile representing seaports. I have the linear cost of shipping for every seaport pairing (specific shipping cost to go from one point to another point). I want to find a way of ...
4
votes
2answers
62 views

How to Select a Polygon beneath another Polygon in QGIS 2.14

We have a series of layers that contain polygons with additional polygons 'underneath' each polygon. How do we select the polygon beneath the existing feature without also selecting the feature ...
1
vote
1answer
32 views

“Hole” argument ignored in call to Polygon function

I am working with a dataset consisting of a list of coordinates for a set of polygons. Some of these polygons are holes. However, the dataset does not follow the convention of listing the coordinates ...
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0answers
19 views

Looking for Polygon data on NUTS2 (2013 system) in CSV or Excel?

Looking for Polygon data on NUTS2 (2013 system). Can somebody supply this in CSV or Excel? I have been searching on NUTS2 Polygon data, but unlucky so far. I have found the data but this is in ...
0
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0answers
31 views

Generate points layer at line intersection

I have a line layer that is actually buffer polygons converted to a line layer. I would like to generate points at all places where 3 or more lines intersect. I would settle for places where 2 or more ...
0
votes
0answers
23 views

Drawing line and finding bearing using ArcGIS for Desktop?

I need to draw a line from a point within a polygon to the edge of said polygon. I do not need to know the length of the line, only the bearing (in degrees) for the line. We are using ArcMap 10.3.1
3
votes
1answer
849 views

Extract data from netcdf using a shapefile polygon in python

I need to subset data from a NetCDF using a specific shapefile. The data are sea surface temperature and ocean color at 1/4 degree resolution. I have 4 polygons describing the US. Northeast ...
0
votes
0answers
74 views

Polylines and polygons - QGIS-2.14.3-1

After extracting contour lines from a DEM (obtaining polylines), and transforming them to polygons, I export the vector layer with polygons to a DXF. Then I import the DXF into Corel Draw to manage ...
5
votes
3answers
160 views

Smoothing method for big polygons

I'm looking for an alternative to 'snakes method' for smoothing very big polygons, which I created from SRTM elevation datasets. The problem is that the smoothing is getting stuck after a while with ...
3
votes
2answers
140 views

Creating OUTSIDE_ONLY buffer around polygon using R?

I would like to create buffers in polygons, surrounding my original polygon. However, I want to keep only the "outside polygon", not include also original polygon. In Buffer in ArcGIS I can just set ...
3
votes
3answers
1k views

How to filter out multipart polygons and then buffer?

I've written a small script trying to accomplish the task described in the question title. It basically looks like: in_fc = '...' # Some shapefile goes here # Get the fields (column names) of the ...
1
vote
1answer
46 views

Colour specific polygons on a postcode map - QGIS

I am working on a UK postcode map. It only has the first bit of the postcode, e.g. BR12. I have an excel spreadsheet with the longitude/latitude of specific points as well as their postcodes. Instead ...
4
votes
1answer
2k views

Create overlapping polygons from contour lines

Working in ArcGIS 10, I have a set of contour lines representing density of commercial square footage, and I have a set of points representing local maxima for each peak of the dataset. For each ...
1
vote
1answer
32 views

Combining Data from raster and polygon

I am teaching myself GIS at the moment, and there are still some matters I haven't quite got the hang of. I'm using ArcGIS 10.1, and have three datasets: LAYER 1: A population dataset at a high ...
3
votes
0answers
48 views

Emulating Polygon Neighbors tool in ArcGIS Desktop 10.0? [duplicate]

I'm using ArcGIS 10.0 SP5. Have a set of 4000 polygons (featureclass A) and I'd like to summarise the values of the polygons (featureclass B) which touch the boundaries of these polygons (ie. those ...
1
vote
1answer
40 views

Splitting polygon into multiple fixed-width polygons along edge in R?

I have a polygon and would like to spit into grid with fixed width along with one edge. The result will look like the figure below. Are there algorithm to achieve my target? My language is R, but ...
0
votes
1answer
41 views

ST_Union or ST_Collect on PostgreSQL union result?

Newbie to PostGIS/Postgres. I have the follow query which returns me 2 GEOMETRYCOLLECTIONS. Is there a way within my current query to return one polygon? SELECT ST_AsText(ST_Collect(ST_Simplify(geom,....
10
votes
2answers
12k views

Converting point sets to polygon boundaries?

I'm trying to convert sets of points to their respective polygon boundaries. I think this is something like a Voronoi diagram or Convex Hull, but not quite. I'm sure there's a technical term for it, ...
7
votes
2answers
158 views

How to calculate how many polygons I can put inside a polygon?

I usually use qgis. I explain my problem with an example: there is a forest (irregular geometry1 ) and one tree (geomery2). I want to know the maximum number of trees that the forest can contain. ...
1
vote
0answers
29 views

QGIS - convert multiple polygons to evenly spaced points within polygon boundary

I need to convert the polygons in a vector layer to evenly spaced points within the polygon boundaries in QGIS. The vector file contains >1000 polygons mostly with overlaps. The attribute data of ...
1
vote
2answers
64 views

Calculating relative share of area covered by water/percentage of polygon area that overlaps in ArcGIS for Desktop?

I need to calculate the share of the area within a 50km radius of major German city centers that is covered by water with either Arcmap 10.3.1 or Qgis 2.14. My plan is to use the Global Lakes and ...
1
vote
0answers
53 views

Creating voronoi polygons from polygons?

I have a database with buildings and for some further analysis I need to: aggregate adjacent buildings (preferably without losing the height attribute, but I can work my way around that) once I have ...
0
votes
0answers
59 views

How can I fix Russian border polygon?

is there easy way to fix Russian border polygon in CartoDB? The polygon is given by CartoDB. From the picture you can see that the polygon covers also Estonian territory. But I need to make there (on ...
1
vote
0answers
40 views

Algorithm to simplify a Polygon/Series of Points to a given number of Points

I have a polygon (or let's call it just a series of points). I want to simplify it (reduce the amount of points) to a given number of points. Currently I use Douglas Peucker and try to guess the ...
1
vote
1answer
37 views

QGIS 2.81. Why can i only see my whole polygon and nothing if i zoom in

I have a polygon layer with one object. It is a flood inundation map. I could see my layer all the time in every scale factor. From one moment to the other it changed and know it is only visible if i ...
3
votes
1answer
64 views

How can I merge two adjacent polygons which borders are not touching each other

I want to merge adjacent single polygons which are apart from each other. Important note: I cannot use ArcGIS, I need to do this programatically, in any language (R, Python, Ruby, PostGIS) doesn't ...
1
vote
2answers
60 views

How can I build a grid of equal square polygons in ArcGIS 10?

Not having them depend on decimal degrees, but on a certain distance. When I use a tool it asks me the length of the cell in degrees, but I want all sides of every cell to be equal and with degrees ...