Process of creating geometric polygon features.

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2
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2answers
174 views

QGIS - Create equal length polygon along polyline

How can I create a series of polygons along a line? I need to assess the density of a number of targets along a line within a corridor. I have tried the following: creating a buffer, using the ...
3
votes
1answer
48 views

polygon split with predefined area

I am trying to split an irregular polygon into 120 equal area blocks. I also need a buffer around each new block within the polygon. Is this possible in QGIS 2.12.1?
2
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1answer
40 views

Make square polygon from one point and area

I have a shapefile of points with a variety of attributes, the relevant ones being "ID", "area", "lat", and "long". Such as... The lat/long coordinates are always the SW corner of a plot and the area ...
1
vote
1answer
83 views

Need help making polygons from lines in QGIS

I am trying make a layer of buildings, divided into apartments, by making polygons from crossing & intersecting lines in QGIS. When I use the vector/geometry tools/lines to polygons tool, I get ...
0
votes
1answer
27 views

Auto-Create polygons from Geo-referenced PDF

Is it possible to automatically create polygons/features from a georeferenced PDF? I'd like to geo-reference an expanded view of the below linked pdf, and then have each of the tracts created ...
0
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1answer
24 views

How to draw line/multiline, polygon/multipolygon with SharpMap from Coordinate Source

I have a list of n points, exactly x objects in GeoJSON from a CouchDB. I want to generate lines/multilines and polygons/mutipolygons with SharpMap and add this to a Layer in VB.NET. For points its ...
0
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1answer
359 views

Polygons not showing in ArcGIS for Desktop?

I am using ArcGIS 10.2. I have used the following procedure to creat polygon: 'Add XY data' to create points 'XY to line' to create line (but I could not see the lines) 'feature to polygon' to ...
-1
votes
1answer
2k views

Formula to convert from WGS 84 / UTM Zone 34N to WGS 84?

Can anyone help me with the formula for converting from WGS 84 / UTM Zone 34N to World Geodetic System? My problem is I want to represent some properties (polygons) in some kind of a map (image). I ...
4
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0answers
268 views

Building larger polygons from smaller ones *without* common ID in PostGIS?

I am looking for a method, using PostGIS, of reconstituting a set of polygons from tens of thousands of smaller polygon 'pieces'. This is a simplified example, with the pieces shaded: Unfortunately,...
3
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0answers
44 views

Creating 30 areas with equal amount of road in an irregular polygon

The result should be something like this just more polygons. Does anyone know about a tool, which given a table, can create a number of polygons which will divide the tables object into, for ...
3
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0answers
126 views

How to create a Polygon around a Linestring as a GeoFence in C# .NET

I'm looking for a .net library that will help to create a polygon that I can use as a Geo-fence around a route on a map. The following image demonstrates the result I'm after. Imagine that this ...
2
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0answers
49 views

Is there an R package for finding the maximum-area rectangle in a non-convex polygon?

Does anyone know if there is an R package out there with an algorithm which finds the largest rectangle within non-convex polygons? I have Googled, searched the R Sig Geo archives, and looked here on ...
2
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0answers
46 views

How can I create a grid of polygons from a .csv file or line vector in qgis?

I have a map defined by two seperate reference systems: one is a standard grid coordinate system, the other a series of irregualar polygons. I want to find which polygon each grid square overlays, and ...
2
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0answers
37 views

Creating lines from lonely nodes in a linestring table to closest point on another linestring table

I want to segmentate a country (denmmark) by using barriers such as larger roads, railroads and the border/ coastline as the delimiting lines of the polygonise function in QGIS. But as most roads and ...
2
votes
0answers
193 views

How to split a polygon into quadrants in R/Qgis?

I am solving the same problem as How to split a polygon into quadrants?, except that I am looking for a solution in R or QGis. So I have a polygon layer shapefile, which is unfortunatelly not exactly ...
2
votes
0answers
151 views

How to extract polygons from a road network?

I need to extract faces (or polygons) from my road network and calculate their areas. I mainly use Arcpy packages but even if you know it in QGIS APIs, I'd appreciate if you'd share it with me. If it ...
2
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0answers
72 views

Weird-looking France after OSM import with osm2pgsql

After importing france-latest.osm from Geofabrik, using osm2pgsql, it seems that the polygon attributed to Metropolitan France (osm_id = 1403916) is a bit odd: I'm far to be a geography expert, but ...
2
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0answers
887 views

Topography: How to convert raster into vector layers?

(nb:This project is part of the #Wikipedia #wikimaps project) 1. Question: How to create vector topographic maps from raster image ? How to convert raster topographic image into closed vector ...
2
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0answers
484 views

Right click editing menu disabled arcgis 10.0

Editing Polygon feature in FGDB, Create Features, Click Rectangle (in Construction tools), right click, unable to select any options (Absolute X, Y / Direction / Length) from popup menu. Help? Havn't ...
2
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0answers
213 views

How to add address block on Google Mapmaker?

Is it possible to mark a block of addresses for example B-block, xyz colony, which is a logical block of addresses on Google Mapmaker? If possible, how do I do it? I want to add a polygon feature ...
1
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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 ...
1
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0answers
38 views

Calculate obstacle accountability area in QGIS

Still being new to the whole GIS world, I am trying to calculate a regulatory takeoff obstacle accountability area for a given runway. For my case, this is defined as an area as follows. At the start ...
1
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0answers
49 views

Creating Polygons of specific sizes

I am very confused! I have tried this afternoon to create a polygon of a set size, namely 30m x 1.8m. I need 33 of these set over a grid (which I have created on a vector layer). I've read ...
1
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0answers
45 views

Lines > Polygon artifacts

I am trying to make polygons from a set of boundaries from an SVG file with closed polylines I downloaded off wikipedia. 1) convert SVG to DXF via Inkscape 2) import into QGIS (shows polyline data) ...
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0answers
70 views

Splitting up a single polygon into many polygons of equal point count

I have point data split into 15 different values and want to split up the (green) polygon into a number of smaller polygons each containing the same number of points so that I can make a chloropleth ...
1
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0answers
59 views

Creating a single layer of polygons from a point layer

I have a csv file of lats and lons for points that represent the vertices of parcels of land. I want to create a polygon for each set of specific points within the csv and then create one unified ...
1
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0answers
96 views

Geoserver does not render polygon properly

I am trying to a get polygon layer from CSV file. I chose to do it via rasterization and polygonization in QGIS, howerver, Geoserver has problems to correctly render some polygons. This is how the ...
1
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0answers
78 views

Network Analyst Add City Boundary as Polygon Restriction

I have a network I am trying to create but am finding the service area polygon I create are "leaking" outside of the city boundary. I was curious if there was a way to add the polygon as a restriction ...
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0answers
58 views

Collection of polygons from a collection of points

I have a set of points, spread over a wide geographical area. I need to be able to create a set of polygons which best represent the clustered points. And I would like to create the clusters based on ...
1
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0answers
313 views

Problems combining (union) Multipolygons in geodjango

I'm using geodjango and postgis (1.x), What is the best way to combine (union) a list of multipolygons. in what i assume is rather inefficient i'm looping trough like this combined = multipolygon ...
1
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0answers
288 views

Spatial Reference and Area/Length Attributes relationship

I currently allow users to add a shape file in. From the shape file, allow the user to generate a new layer base on the polygons from the shape file's polygon they imported. Generating the new ...
0
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0answers
11 views

Set of points to multi polygon with specified distance

Is there any algorithm that can transform set of points to the set of polygons with defined maximum distance between points, especially I wonder if it is possible for inner polygons? Please, consider ...
0
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0answers
25 views

A vector object not being replaced in temp folder when using 'for' loop in R

I am currently running GRASS GIS through R interface and got stuck at this point; where I am using a 'for' loop in R, and the code is as follows: for(i in 1:nrow(Snapped_SSP_DSN)) { writeVECT6(...
0
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0answers
140 views

CSV to Polygon.SHP with Python

I'm looking for a way to convert CSV file to polygons shapefile. I need to make polygons with defined size. In the CSV file, The first row is the length of each polygon and the first column is the ...
0
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0answers
63 views

Postgis poligonize. How to create polygon in postgis from linestring

I have a problem with the poligonization. I have a table that contains the my borderstones. The second table defines the next and previous point. It is important because these are attribute datas. ...
0
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0answers
22 views

Creating regions (set of lat, lng) on map using other than ArcMap?

I'm writing a project for school and as a part of the project I need to tell if a certain point is within a given region (which is a polygon made of lat, lng tuples). So far I was working with http://...
0
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0answers
45 views

python (arcpy) command for Construct Polygons

I am looking for a python (arcpy) command for Construct Polygons. I am unable to find it in Esri help. So Is there a python command for Construct Polygon that I may have missed? OR Is there an ...
0
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0answers
58 views

Complexity of US 5-Digit Zip Code Boundaries from Scratch?

Does anyone have any idea how difficult it would be to create 5-digit zip code boundaries from scratch? Let's suppose you start with a good outline of the US. Where would you source the fundamental ...
0
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0answers
29 views

Defining bays as polygons using shapefile of Scottish coast?

I am interested in determining bays from around the coastline of Scotland. Ideally what I want to end up with is a number of polygons defining each bay using a shapefile of the Scottish coast. The ...
0
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0answers
122 views

Drawing boundaries between discrete features based on attribute values in ArcGIS for Desktop?

There is a point feature class with a certain numeric attribute (let us say, populated places with population). I wonder if there is, in ArcGIS, a way to draw polygons such that the sum of the ...
0
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0answers
36 views

Get next point horizontally and vertically

I am working on a map application. We have to draw polygons for different sections. Each section is either a square or a rectangle. Data that I have has less than 4 coordinate points, insufficient to ...
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0answers
76 views

For every point create a wedge

How does one create a wedge polygon from a point? If I have 2000 points, I want each to have a wedge starting at each point with each point having a defined azimuth that the wedge points toward. That ...
0
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0answers
126 views

Dividing a polygon into certain areas (open source solution preferred)

I have a polygon with an area of 50.000m². Now i want to devide this area in two polygons of different areas with a line layer. The left polygon should have an area of 30.000m² and the right polygon ...
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0answers
99 views

creating Polygon from LineString and a width

I have to create a Polygon from a lineString and a width. Ex: Given a street as a lineString (Or a list of points) and a width, create the polygon (the road). I am using Geotools, but I couldn't find ...
0
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0answers
275 views

How do I optimize the speed and enable ArcGIS to create the Service Area around my locations?

The Problem: Every time I try to solve the service area around locations, ArcGIS crashes. It takes forever to load facilities and draw just a single polygon. How do I optimize the speed and enable ...
0
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0answers
204 views

How to draw polygons around known clusters

I need to split up an area into non-overlapping, but contiguous territories. I have n points on a map, which are partitioned into k sets. The partition is only partially geographic, meaning that ...
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0answers
1k views

Why is a Shape polygon file not editable?

I received a .shp polygon file. When I choose the edit toggle tool in QGIS the little red X's appear as expected. Then when I try to edit the polygons such as add a polygon all seems to go well, when ...