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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2answers
748 views

ArcGIS 10.1 - Using Polygon Neighbors with dissolved polygons

I've used polygon neighbors to find all neighbors of a polygon layer, which I then use to look up all possible neighbor combinations and dissolve the polygons into all possible combinations of two ...
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2answers
1k views

Detecting invalid polygons (self-intersecting or touching)

An invalid polygon can be defined as one that intersects itself, or one where the lines make contact, ie, the two shapes at the top of this picture. Given the XYPoints of a polygon, what logic (...
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1answer
77 views

Polygons Shrinking and Moving as if CRS Was Suddenly Out of Sync with Project

I long ago set the CRS for a linguistic geography project I'm working on involving Oklahoma data (EPSG:2836 - NAD83(HARN) / Oklahoma North), and I have been closely monitoring that the polygon ...
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2answers
1k views

How to scale/reduce my polygon without changing the central lat & long?

I am writing a VBA code to resize my polygon, I get a input as vector points(Shape file). The code below resizes it as according to my scale factor but my central latitude and longitude are also ...
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1answer
7k views

Merge attribute of points into a polygon : Arcmap 10

I have points layer which the attribute looks like this: FID Shape ID Lat Long 0 Point 2065 -5.51666 106.48333 1 Point 2319 21.93333 120.73366 I also have polygons layer : FID Shape ...
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1answer
550 views

OpenLayers generate random polygon

I have a world map. I need randomly to generate polygons and render them on map. I have no problem with rendering, but can anybody suggest how to generate polygons with random geometry? (I need n ...
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1answer
2k views

How to label each polygon in a layer?

QGIS 1.8.0 Mac OS 10.6.8: I want to label each polygon in a layer in a similar way to this image (done in WP Presentations) and am totally confused by the manual. Obviously I have to find a list of ...
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1answer
434 views

Using the ArcGIS Runtime SDK for C# is there a method to Hit Test for a polygon on the graphics layer?

I am very new to using ArcGIS runtime SDK for C#. I have loaded a polygon from a shapefile. I wish to query if a lat/long point is inside or outside the polygon? How can I do this? Thanks in ...
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1answer
6k views

Calculate maximum and minimum elevation for a polygon layer from a DEM [duplicate]

I have a polygon layer and would like to know the min and max elevation within each polygon. My elevation layer is a digital elevation model. I'm not quite sure how to extract that information. I am ...
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2answers
2k views

Calculating shape perimeter/area per zone in ArcGis 10

How can I calculate geometrical features of polygon (perimeter and area) per zone (similar to zonal stats for rasters)? I have a square fishnet (approx 20x35, 1 square kilometer each) and I need to ...
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1answer
269 views

How to remove polygon under other one?

Hi, lets say that green polygon is under red and part of blue with yellow stripes is also under red polygon. how can i make one polygon from every polygons that intersects my main ( red ) polygon and ...
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1answer
63 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 ...
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1answer
30 views

Quick way to produce polygons to cover variable precision lat / lon points?

I'm using the Smithsonian Global Volcanism Database and have a .csv lat lon points from it. It seems they are using decimal precision on their lat lon to give a rough idea of the size of the area that ...
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1answer
26 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 ...
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1answer
45 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,....
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1answer
21 views

Cut Tool or Process to mimic cutting in a “cookie cutter” like fashion

Say I have a sidewalk polygon, and on that segment of sidewalk I have 5 tree grates that I want to cut out of the sidewalk polygon. Is there a tool or an easy process that I could cut out one tree ...
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1answer
30 views

Triangulation method to create multipatch objects (decomposition of polygon surfaces)

Which triangulation method or algorithm does arcscene use to create multipatch parts (patches) as you see in the attaching picture. The algorith decompose the polygon area into a set of triangles ...
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1answer
60 views

How to calculate distance from point to nearest polygoin via road network (polyline) ARCMap 10.3.1

Using ArcMap, is it possible calculate distance from a postcode (point) to nearest polygon using a road network layer (polyline)? As opposed to just calculating Euclidean distance?
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1answer
46 views

Finding neighbors for non adjacent polygons in R [closed]

I'm looking for a method or function in r-project that create a neighborhood matrix from a group of polygons that don't touch each other, like polygons of set of blocks separated by streets in a town. ...
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1answer
48 views

Intersection of a raster and polygon in ArcGIS 10.3

I have two data sets one raster and one polygon. I am interested to see learning the area where the two overlap. I was thinking that I could use the intersect function, but since one of the layers are ...
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1answer
26 views

Identifying the closest polygon to a point dataset

I have two large data sets one point and one polygon. What I was looking to do was identify which polygon is closest to each point. Hopefully I was looking for a automated process as the point data ...
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1answer
45 views

Convert this CSV to a qgis usable format

I have been given a CSV (which has been converted from a RDF). I want to convert the CSV file to a usable format so that I can display these polygons in QGIS. The original file and some other ...
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1answer
66 views

Python Calculate Cumulative Polygon Areas (Basins)

I've been asked to automate the calculation of cumulative polygon areas within a basins shapefile. The calculation will take the area of the upstream basin and add it to the area of the downstream ...
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1answer
40 views

Unexpected results when using ST_Intersection for polygon features

I've to create a spatial intersection of two tables (poly_a and poly_b) containing polygon features. Is there any way to remove unexpected linestring results? CREATE VIEW poly_intersection AS SELECT ...
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2answers
28 views

Keeping attribute table when converting from polygon-based feature layer to grid layer

I am trying to transfer (or extract) attribute data from a polygon-feature class to point data. I can do this for a grid file using the Spatial Analyst-Extraction-Extract multi-values to points ...
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1answer
39 views

Masking low quality raster with polygons in R gives weird overhang?

I am pretty new to R, and have been attempting to use the mask function on a raster image of 250mx250m resolution. My problem is that for some reason I am getting overhang, as there are pixels which ...
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2answers
303 views

Adding one search box for multiple GeoJSON polygon layers?

Multiple GeoJSON markers can be combined to one group layer then search on a specific attribute but doesn't work for GeoJSON polygons. How to put multiple GeoJSON markers and polygons in one search ...
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1answer
40 views

Polygon Representation from Contours

I have contours lines along with their elevations in ArcGIS. I want to create a polygon representation from those contour lines. How can i create polygons from those contours which may help me to ...
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2answers
51 views

Polygon Torque Map- problem changing polygons to points

I'm trying to alter my data on cartodb map to get maritime emissions over about 20 years- by country. Hence trying get a torque map for polygons, and by changing polygons to points based on a ...
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1answer
42 views

Polygon shapefile layer shows NoData for Identify in ArcGIS Desktop?

I have a soil survey polygon map with each polygon representing a soil type. If I examine the attribute table of the layer, I can see what each polygon represents. If I select a row in the ...
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1answer
131 views

How can I draw a polygon with a fixed area in ArcMap

Is there a way to draw a polygon with a fixed area in ArcMap? For example, I'm trying to create a 40,000 foot boundary around a feature, but the boundary does not have to be any specific length or ...
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1answer
180 views

How to convert a line shapefile to a polygon shapefile? [duplicate]

I am using Arcgis 10.1 and have an existing line shapefile that i would like to convert to polygons.
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1answer
146 views

R: problem with rasterize getCover - not working

Are there any known bugs with the getCover argument in the rasterize function? (R package 'raster'). or has anyone got a fix for the following: I have a series of landcover polygons, here is a small ...
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1answer
222 views

How to create a polygon with a circular hole in openlayers 3?

To highlight an area on my map I need to make a circular hole in a polygon. The rectangle polygon covers the whole map, the circle hole should act as a spot on my area to highlight. But actually I ...
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votes
1answer
55 views

Multply polygon with raster

I have a countries' polygon with an attribute table. I also have a raster. I want to multiply the values of the polygon (of each country) with the raster. Polygon Countries Cost C1 X ...
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1answer
47 views

ArcGIS: How to create polyline features from the southern delineations of a polygon?

This can be considered a follow-up question to what I've asked a few weeks ago in this thread: How to set a buffer only in a specific direction? Back then I was trying to set a buffer to several ...
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1answer
229 views

Multipolygon From Multilinestring PostGis

I have been looking for a answer for days. I dont even know if its possible. Tried: ST_AsGeoJson(ST_MakePolygon(ST_transform(geom,4326))) ERROR: Shell is not a line ST_Polygonize(ST_LineMerge(...
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votes
1answer
173 views

Adding pixel value data from a raster layer to a number of buffer polygons ArcGIS

I have created a layer of polygons with buffers around my points of interest, all of the same size, in Arc GIS. I also have a raster layer of nighttime lights with pixel values between 0 and 63 ...
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1answer
99 views

delete unconnected polygons in a shapefile [duplicate]

I need to delete isolated polygon (green circle) from a shapefile but I do not want to delete polygon that connected with other polygon (red circle?
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votes
3answers
132 views

Make polygon from area not covered by loaded polygons (like invert selection)

See screenshot, from geojson.io, with a geojson file loaded: So how do we make a polygon out of the blank area? Looking for a way which doesn't involve manually copying selected sequences of co-...
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1answer
34 views

Double Entries/ Errors with Digitizing Polygons

I have a layer that has errors, i mean polygons have double entries (digitized twice), i can edit manually but there's a lot of attributes and it will take ages to clean the data. Is there any short ...
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1answer
110 views

Cannot edit polygons in Qgis

I have a google Layer map on top of which I have added a raster layer of Image and then mapped image coordinates from Google layer. I made transparent (75%) image map layer and now mapping and ...
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1answer
94 views

TopologyException error during fortify SpatialPolygonsDataFrame

I tried to reproduce a recent question on spatial data visualization using ggplot2 and received the following error message during fortify(world, region = "ISO3"): Error: TopologyException: Input ...
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votes
1answer
81 views

Python error in polygon to raster conversion

I want to convert polygon to raster. I converted the dbf file ( "cntymam") to table view to make use in the conversion. I am getting a error that the parameters are not called and also with the grid ...
0
votes
1answer
34 views

Assigning values from one polygon to second polygon if located within first using ArcGIS for Desktop?

I have two layers of polygons. I would like to know if there is a way to assign a value from a polygon in the first layer to any polygons from the second layer that fall within that polygon?
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5answers
2k views

Fix Self Intersecting Polygons Manually [closed]

I are looking to implement a method to fix self-intersecting polygons by editing the vertex order. We want to take the polygon rings and re-arrange/add in vertices to make a valid polygon. This is ...
0
votes
1answer
101 views

Sampling one shapefile with polygons of another using R?

I have two shapefiles that partially overlap. One (the bigger one) consists of several polygons which represent fields I am interested in. The second, is a rectangular shape that overlaps about 30% of ...
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votes
1answer
118 views

Simplifying polygons in ArcGIS considering contains-one-point topology rule?

I want to simplify polygons using the "Simplify Polygon (Cartography)" tool in ArcGIS 10.2. Additionaly there is one point in each polygon and this condition should still be fulfilled after ...
0
votes
2answers
2k 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 ...
0
votes
1answer
159 views

Merge two points of two different polygons to get one polygon at the end

I would like to join points from two different features. I already searched for plugins but so far but didn't find one working plugin or solution for my task. So here is a picture of 2 polygons/...