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Questions tagged [polygon-creation]

Process of creating geometric polygon features.

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1answer
38 views

How do you calculate drive times around a point? [duplicate]

For example, if I have an Airport point and I want to create a 30-minute Drive Times buffer polygon around it, how would I do that? I'm currently using QGIS 3.4.4.
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0answers
18 views

Making polygons from coordinates

I am working on a project regarding the mapping of solar parks in the rural areas of my country, unfortunately, the data that I have, are in paper and printed topographic maps. So I need to make ...
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1answer
38 views

Automatic polygonising in QGIS? [duplicate]

I have multiple points and I need to create polygons that consist specific amount of points. How could i do this?
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1answer
54 views

Polygon Neighbors for boundary polygons

I am working in ArcMap. I have a map of districts in South Carolina, and I'm trying to find the boundary length that every district has with every other district, and the boundary of South Carolina ...
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1answer
95 views

Draw a polygon with specified edge length in QGIS Madeira

I am looking for a possibiliy to draw a polygon with specified edge length in QGIS Madeira. I already checked further Threads belonging to this question, but all answers refer to PlugIns which are not ...
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1answer
58 views

Why can't I buffer polygons in ArcGIS Pro?

I've created a polygon by merging several polygons from the same layer using the merge option under Edit menu. Now I cannot buffer the resulting polygon. I tried repair geometry it didn't help. I'm ...
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0answers
66 views

PAEK smoothing tolerance

How should one determine what the Polynomial Approximation with Exponential Kernel smoothing tolerance should be when smoothing a shapefile using the Smooth polygon tool?
4
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1answer
105 views

Automatic polygon placement from trail

I have a shapefile with >300 points that correspond to the points where vegetation survey plots were carried out 10m from the road on both sides. Plots have the dimensions 20mx50m. The attributes ...
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1answer
67 views

How to create quadralinear polygons around a set of points

I have a point shapefile of locations of trees in an orchard that are almost, but not quite, on a grid. The orchard is divided into plots made up of groups of trees that either in a rectangle of rows ...
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1answer
31 views

Creating polygon from lines, using the lines' attributes?

I'm trying to transform lines into polygons with the attributes. The lines are from a dwg file. I tried to use "feature to polygons" but doesn't preserve the attribute. I tries to transform lines to ...
4
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1answer
84 views

Why is my arcpy.Polygon changing how many vertices it has?

Using a Python script, we are pulling a list of polygon vertices from a web service to build a polygon and insert it into our SDE. The problem steps are happening when we're making an arcpy.Polygon ...
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1answer
246 views

How to create a polygon from a Print Composer or Print Layout map extent in QGIS?

How do you create a polygon from a QGIS Print Composer or Print Layout map extent (i.e. a polygon that is the exact area shown in a map within a print composer/layout)? Ultimately I would like to do ...
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1answer
104 views

Creating Polygons from Points in Carto

Using Carto, I am trying to create shapefiles of regions using points(Link to Dataset in Carto ) with a shared column value to group by. I've included 3 photographs. 1st photograph of the points ...
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0answers
28 views

Processing tool to fill all voids within a lines layer

I'm trying to convert a lines layer from Ordnance Survey which is made up of field boundaries, river banks, woodland boundaries and houses etc into a polygon layer, but only 'polygonise' the fields. ...
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1answer
191 views

Generate grid for specific scale in QGIS

I have a rather large map that I want to break down into smaller parts, or sheets. So I'm going to use the 'atlas' feature of QGIS Print Layouts. My layers in QGIS have a CRS of GDA94 (degrees), where ...
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1answer
358 views

JTS: generate a polygon geometry from line geomtry

I have a line and I wish to convert it to a polygon. The point is this line is NOT a ring it's an straight Line. And I want to use an specific width to extend line horizontally and create a polygon. ...
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1answer
779 views

Editing polygon in QGIS

I have a shapefile of polygons. What I want to do is take some areas and discard others. For example, I have a map of USA (shapefile). I want to take California only and make another shapefile. How ...
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2answers
330 views

Create rectangular polygon with dimensions in km centered on points in point layer

Given a point layer in QGIS 3.03, I am attempting to create a second layer of square polygons with a specified length of x kilometers whose centers are the points in the first layer. What would be ...
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0answers
91 views

From Kernel Density to a polygon that covers 80 % of points

I have a set of occurrences as points in a district. I used Kernel Density tool, to show the areas of various densities. I also want to create one polygon that covers X % of points. I've tried the ...
0
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1answer
69 views

Creating donut polygon in existing polygon using ArcGIS Desktop?

I am tracing polygons in ArcGIS with the help of editor tool but I need to exclude some areas from the existing polygons. How can I make it? I went through google, but instructions provided are ...
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0answers
252 views

Creating multi-country Google Maps API Polygon?

I'm working on an embedded interactive map using the Google Maps API. I need to show several "regions" that each contain some neighboring countries. For instance one of the regions is the countries of ...
3
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1answer
85 views

Disappearing Field Boundaries in ArcMap?

I am creating some polygon features that map farm field boundaries. After creating about 3-4 of them, I noticed that the first one I created disappears from the Map View. If I look at the attributes ...
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1answer
262 views

Edit kml polygons pop-up to open it all when click on one of that using Google Earth

I have a couple of polygons in kml format and I want to open it in Google Earth. That what I need is when I click on one polygon than all other polygon pop-ups of same owner (or any unique field for ...
2
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1answer
629 views

Convert multiple lines into a polygon in QGIS

I am working on a huge CAD-map that I am supposed to convert into a GIS map. Currently I am trying to convert the symbols used for survey points (see below) into polygons, of which I could calculate a ...
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1answer
26 views

Automatically generate polygons based on conditions

Suppose you have two rasters. I would like to create a number of polygons such that each pixel belonging to each polygon fulfilsthe two conditions. E.g. condition1: rastera > x; condition2: ...
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1answer
79 views

grid data to contours

I have a dataset containing a grid of geo-referenced points that have a corresponding value. I'd like to create geographical areas (polygons) at certain levels within the grid, basically combining all ...
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1answer
72 views

Unable to draw multiple polygons using Shapefile layer

I am new to QGIS. I would like to draw a boundary and a few polygons (to represent buildings or concreted areas) on a map for planning out a farm soil delineation map (with some irrigation). I was ...
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2answers
2k views

Creating Polygons using Google Earth Pro?

I am brand new to Google Earth Pro, and in walking through the tutorials, my polygons don't work as they're supposed to. I follow all of the instructions from the Google Earth lessons, but nothing ...
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0answers
162 views

Calculating the acreage of a created polygon in ArcGIS Collector

I recently set up an app using ArcGIS Collector. I have a editable polygon shapefile that has an acreage field. It allows me to create a new polygon, but requires that I enter in the acreage field ...
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1answer
88 views

Create Pseudo Drilling Spacing Units - Polygon inside another polygon from its boundaries

I am trying to create pseudo Drilling Spacing Units. That corresponded with the section, township and range that they are generated from. I am working with Sections from the Land grid in Oklahoma; ...
2
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1answer
214 views

Creating vertical polygons in ArcGIS Desktop?

I am trying to convert vertical line (cross-section) features to the polygone, but all regular arcGIS tools (eg. Feature to Polygone) that I applied can't convert vertical lines to vertical polygons. ...
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0answers
494 views

Create Polygon - How do I bring a table in with Lat/long

I found the below code for creating a polygon. I know what a polygon is, but I'm confused about the code. I have my polygon points defined, but where do I bring my table in to match to the polygon lat/...
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0answers
400 views

Polygon doesn't appear in QGIS

I have created a polygon shapefile and the nodes can be seen in edit mode: and here is the symbology as I have tried to set it (I wanted no fill and red outline): The polygon doesn't appear on the ...
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0answers
40 views

How to draw an exact polygon with exact messurements

I want to draw a polygons on a Google satellite map. I made a Shapefile to work in, but I can't find the right tool to make a polygon that is exact 20 x 20 or 40 x 10 or some other measure. As I start ...
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1answer
387 views

Why does polygon disappear in QGIS?

I am new to the whole QGIS platform but have worked out adding layers, shapefiles, polygons etc. and the rest of the simple stuff. But just now the polygon I am trying to add disappears when I right ...
6
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1answer
144 views

split regular polygons in regular sub-polygons

In QGIS, I have a layer containing 62 equal-sized, quadratic polygons: I want to split each polygon regularly into 9 quadratic sub-polygons and tried the polygon divider tool. Results are fine for ...
8
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3answers
319 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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1answer
404 views

Creating a Radial Sector Overlay in QGIS

I need to create a sector grid radiating out from a point of interest. Here is an example that I laboriously put together by hand: I have found a couple of similar solutions in How to generate ...
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0answers
53 views

Raster to Polygon tool results in reduced area

I have a large raster dataset within a file geodatabase (FGDBR format raster) which I have converted to polygon using the 'Raster to Polygon' tool. Cell size of original raster = 25m. Cell size of ...
2
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1answer
306 views

QGIS - Creating a new polygon layer from the space between other layers

I wonder if it´s possible with QGIS (2.18) to create a new polygon shapefile directly from the space between Another 2 different polygon layers: What I would like to do is to fill the gap between the ...
1
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1answer
185 views

Adjust points based on offset angle

I have a centre point XY. I have a series of measurements around the point in xy offsets in centemetres from XY. I need to create a polygon of these measurements. With the first measurement x is ...
12
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2answers
225 views

Generating consistently-dimensioned polygons in mm units?

I have a function which creates Solar Photovolatic panels represented as polygons. Essentially, it creates a rectangular grid where the user can specify the following parameters: Length Width ...
0
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1answer
107 views

Georeferencing map images

I have to regularly create KML polygons of map area outlines (white outline, QGis width 1.754, Google Earth width 5). I tend to have map image source files. I know how to georeference a source image ...
3
votes
1answer
545 views

Drawing polygons with holes in QGIS? [duplicate]

In QGIS 2.18 I draw polygons on a certain grassland-type on aereal imagery. Sometimes, there are other landcover-types within the patches of interest, so I'd like to draw polygons with holes. In the ...
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0answers
220 views

Cannot add polygon into a shapefile with existing categorized classification

I'm trying to add a polygon into an existing shapefile named "landuse" that already has categorized classification. However when I finish drawing the polygon I get the message The feature cannot ...
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0answers
24 views

How can I create polygons that are on the edge of point data and angle the polygons based on numerical angle data generated from flow direction?

ArcGIS 3D Analyst 10.5.0. I have a set of well locations and I would like to define the groundwater capture zone based on the groundwater velocity and the direction of flow. I calculated flow ...
0
votes
1answer
192 views

How to draw a polygon around the point with condition in ArcMap?

I have above 2000 points where each point has a field which indicates a number of incidents from 0 to 300. I want to draw a polygon around each of these points where the total number of incidents ...
4
votes
1answer
497 views

Drawing horizontally/vertically aligned rectangular polygon in ArcGIS Desktop?

I am trying to draw some rectangles in a polygon layer, to be used to highlight points for checking, and will be used in Data Driven Pages. I want these to be horizontally aligned, however the "...
5
votes
2answers
158 views

Single point into individual polygon

I imported water contamination data from surface water bodies from a CSV file. Each water body was georeferenced with a single pair of lat/long coordinates. Now I have a map full of individual points ...
5
votes
1answer
510 views

How can I split a polygon into two equal parts along a N-S axis?

I have a PostGIS database with a table called 'sites' that includes a field sitename and a field geometry. If I select, e.g. select sitename, ST_AsGeoJSON(geometry) from sites limit 1; I get: ...