Process of creating geometric polygon features.

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191 views

How to copy closed loop lines into polygon feature class

I'm trying to utilize line contour data to find the volumes of local depressions. To do this, I want to copy the closed loops formed by depression contours into a polygon feature class to find the ...
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23 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 ...
2
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1answer
188 views

How to construct semi-circle-shaped areas of confidence in ArcGIS Desktop?

We have polygon maps of river-bottom type and are interested in determining if particular bottom-feeding fish prefer one bottom type over another. We locate an acoustically tagged fish at a point in ...
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1answer
215 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 ...
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33 views

QGIS polygonize tool not working [closed]

I am having a problem using QGIS ver 2.10.1 Pisa. I am trying to use the polygonize function on a raster .tif image, and it runs, but only produces a thin sliver of polygons at the top, then stops ...
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1answer
27 views

How to use QGIS plugin “Rectangles, ovals digitizing tools”

I installed the Rectangles, ovals digitizing tools-plugin, found it on the toolbar, but it's inactive. I made a layer to which I want to add rectangles, it's visible and editable... The plugin bar is ...
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37 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 ...
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42 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 ...
2
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1answer
72 views

Python script outputs polygon feature class with no shape_area or shape_length and therefore doesn't show up in arcmap

I am trying to copy features a number of times based on a numeric field value. The code below works for points when the POINT type is chosen. However, when I switched the feature type to POLYGON it ...
3
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1answer
289 views

Dynamically drawing a polygon around another shapefile, ArcGIS 10.2

Let's say I have a vegetation raster that indicates the density of forest all over the world. I also have a shapefile that contains the admin boundaries of each country in the world. The easy part is ...
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24 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)) { ...
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94 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 ...
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1answer
27 views

Capturing an event On Sketch Finish in ArcObjects

I am using IEditEvents_Event and IEditor. I invoked the GarciaUI_CreateNewFeatureTask and used: pID.Value = "esriEditor.SketchTool"; pCommandItem = pCommandBars.Find(pID); if (pCommandItem != null) { ...
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1answer
45 views

Data frame to SpatialPolygonsDataFrame with multiple polygons

I have a data frame with a bunch of polygons, several points per polygon. How can I convert it to a SpatialPolygonsDataFrame object? Here's my data frame: > buildings_df lon lat ...
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2answers
740 views

Zipcode to Polygon/Boundry

Is there any API out there which can give me Polygon value for a zipcode? I really thought that it would be fairly easy for me given the number of Maps APIs out there. Either Google Maps API or ...
2
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1answer
268 views

How to create a JTS geometry with holes and islands?

I have a JTS multipolygon geometry created by an Polygon array: multipolygon = gf.createMultiPolygon(this.polygons.toArray(new Polygon[this.polygons.size()])); Those polygons can describe holes or ...
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1answer
46 views

Creating polygon features on scanned historical maps to measure areas in ArcMap?

I have a collection of historical scanned topographic maps from the 19th century that have already been georeferenced (NAD 1927). I'm uploading the maps as JPGs into ArcMap and would like to use the ...
3
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1answer
157 views

Create mosaic like Voronoi Diagram from disjoint polygons

The illustration below shows the problem: as in (a) I have a set of disjoint polygons, as geometries in PostGIS. I need something like (b), the "mosaic" of this set of polygons, building it by a ...
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44 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. ...
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1answer
409 views

Postgis - extrude a polygon

I want to extrude a polygon shape in postgis to create a pseudo 3D effect. To this end I have written a crude function to achieve it. This is very much test code and it creates a new Y vertice for ...
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2answers
409 views

Can't transform lines to polygons

I have a similar question to: How to join lines in QGIS for later using "lines to poly"? I have a line shapefile that I wish to transform into a polygon shapefile. After making some ...
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0answers
27 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 ...
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2answers
40 views

How do I create a polygon based on a single point?

I have been given a large spreadsheet of sample data where each point coordinate represents the end of the sampling extent. I am tasked to represent these points as a sampling extent of 100' x 8' with ...
2
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1answer
79 views

Python script: “points to polygons” skipped fourth vertex

Using ArcGis 10.2 I have a script converting the nodes of a net into polygons. The polygons should be either triangles or rectangles but the script doesn't build polygon as rectangle, skipping the ...
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2answers
49 views

How do I generate grid square polygons from a 5m DTM file?

For my dissertation I have collected point features as coordinates and want to relate their distribution around a lake to elevation to see if there is any pattern/relationship between them. I have ...
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245 views

building larger polygons from smaller ones *without* a common id in PostGIS

I am looking for a means, 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 ...
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1answer
35 views

Obtaining areas from overlapping polygons

Using ArcView 9. I have a data set of about ten thousand parcel polygons and a similar number of driveway polygons extending from a roadway polygon into the parcel polygons. My ultimate goal is to get ...
16
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3answers
3k views

Producing building shadows using ArcGIS Desktop?

How would you generate building shadows from building footprints? I have attribute values for the heights of buildings. So would preferably like to have the shadows' sizes vary based on that. The best ...
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2answers
94 views

How to select points within a certain distance from a line?

I have a file with a points layer and a lines layer. I would like to select only the points that lay within certain distance (a couple of meters) of the lines. Is there an easy way to do this? Or ...
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45 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 ...
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2answers
54 views

creating a right angled rectangle on google maps from a line

I have an application where the user draws a line, then automatically the software should create a rectangle where the line intersects the midpoint of two adjacent sides of a right angled rectangle. ...
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3answers
2k views

Finding line length while editing in QGIS?

I am using QGIS. I would like to know if there is any way during the editing phase of a vector (line or polygon) to know the length of the line (total and partial) that is being created?
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2answers
269 views

Create Editable Layer ArcMap 10.2 Desktop

In ArcMap 10.2 for desktop, I wish to create an editable layer to add a simple shape to. As of right now, I have a basemap layer and my selected basemap. However, since the basemap layer is not ...
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0answers
19 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 ...
0
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1answer
40 views

Arithmetics with Coordinates [duplicate]

I wonder if I can do simple arithmetics with coordinates. Can I do substraction of coordinates like 2.570801 (lng) 46.89023 (lat) / 17.424316 (lng) 55.15377 (lat)?! Or will that get messy without a ...
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0answers
40 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 ...
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2answers
432 views

Drawing BTS sectors in GSM?

I'm very new to Mapbasic. I tried to make a short code to draw some BTS in GSM but I can't do thant (over 1 month). I have a table with these column: Sitename, Lon, Lat, Azi, Beam, Dist. Can ...
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1answer
23 views

Creating polygons or map book from DBF file through ArcPy?

I have a dbf file, which contained a list of coordinate information as shown in below. It also could be thought as a catalog file. Example: ID XMIN YMIN XMAX YMAX 1 -52800.0 ...
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11 views

Divide/Split single polygons from one Shapefile using ArcGIS for Desktop? [duplicate]

I have a map of Austria which shows all the federal states in own polygons. As a whole - sure - you get Austria. I know how to make several states invisible so that you can just see particular states ...
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1answer
64 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
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3answers
392 views

How to generate polygons upto the edge of other polygons?

I am doing some work on a pipe network (blue lines) and I am trying to attribute the information about the street to the pipes. I have 2 polygon layers one of the blocks (green hatch) and one of ...
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1answer
84 views

Convert Parallel Polylines (edges of pavement) to Polygons

I would like to find a way to convert an Edge of Pavement layer into polygons that would represent the total paved area. It's a large shapefile, covering some 100 sq miles or so, so doing anything ...
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3answers
599 views

Cut polygon into new polygons using lines in ArcGIS

I'm new to GIS and I work with ArcMap. I have a layer with an orthophoto of a graveyard. On top of that, a layer with an old scanned map of the same area showing all graves. I would like to make a ...
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0answers
33 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) ...
5
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1answer
511 views

Simplifying polygons made from binary rasters using ArcGIS Spatial Analyst?

I'm using MaxEnt to produce a species presence / absence raster layer. It works fine but I have to choose a cut off point for what constitutes presence or absence. As a result I end up with a lot of ...
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1answer
203 views

How to create empty polygon shapefiles with the same field names using python?

I'm new to python scripting in GIS and I have a list with species names, for every species in the list I want to create an empty polygon shapefile with the same fields inside the attribute. I read How ...
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44 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 ...
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1answer
1k 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 ...
7
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3answers
5k views

Extract Overlapping Polygon Data to Points

I have a polygon data set of corn yield collected by a combine. However, as the combine drove through the field, there was slight overlap between passes, leading to overlapping polygons within the ...
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0answers
52 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 ...